Audiobookshelf MCP server

Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?

Annotations already indicate readOnlyHint=false (write operation), idempotentHint=true, and destructiveHint=false, so safety is covered. However, the description adds little beyond that—it does not explain side effects (e.g., whether existing keys are invalidated), authentication requirements, or response behavior. The phrase 'act on' is ambiguous and does not disclose what happens on creation. No contradiction with annotations.

Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.

Is the description appropriately sized, front-loaded, and free of redundancy?

The description is concise, with only three lines including the HTTP endpoint and an Args section. It is not bloated and gets to the point quickly. However, the phrase 'Create or act on' is vague and could be more specific, but overall the structure is efficient.

Shorter descriptions cost fewer tokens and are easier for agents to parse. Every sentence should earn its place.

Given the tool's complexity, does the description cover enough for an agent to succeed on first attempt?

Given the tool's complexity (one opaque parameter, many related siblings, and an existing output schema), the description is incomplete. It relies on external lookups (GET/schema) for field definitions, does not clarify what 'act on' means, and provides no information about return values or usage conditions. For a create operation with no annotation coverage of behavior, this is insufficient.

Complex tools with many parameters or behaviors need more documentation. Simple tools need less. This dimension scales expectations accordingly.

Does the description clarify parameter syntax, constraints, interactions, or defaults beyond what the schema provides?

Schema coverage is 0%: the only parameter 'body' is an opaque object with additionalProperties=true, so the schema provides no field details. The description directs the agent to read a GET or /schema endpoint for field information, which is a helpful workaround but does not actually describe the parameter semantics. It falls short of compensating for the schema gap.

Input schemas describe structure but not intent. Descriptions should explain non-obvious parameter relationships and valid value ranges.

Does the description clearly state what the tool does and how it differs from similar tools?

The description states the resource (api-keys) and HTTP method, but the verb 'act on' is vague and could imply update or delete actions beyond creation. It distinguishes from siblings by mentioning 'api-keys', but does not clearly separate create from patch/delete operations. The tool name clarifies creation, but the description itself lacks precision.

Agents choose between tools based on descriptions. A clear purpose with a specific verb and resource helps agents select the right tool.

Does the description explain when to use this tool, when not to, or what alternatives exist?

There is no explicit guidance on when to use this tool versus alternatives like patch_api_keys_by_id or delete_api_keys_by_id. The only hint is to read the matching GET or /schema endpoint first, which is a prerequisite for constructing the body but not a usage scenario. No exclusion criteria or alternative routing is provided.

Agents often have multiple tools that could apply. Explicit usage guidance like "use X instead of Y when Z" prevents misuse.

Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?

Annotations already convey non-read-only, idempotent, non-destructive, but the description adds no effect or side-effect context. 'Create or act' gives no detail about what the call changes, authorization side effects, or required permissions.

Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.

Is the description appropriately sized, front-loaded, and free of redundancy?

The description is brief and line-structured, but 'Create or act on api authorize' is weak filler that doesn't earn its place. It is not bloated, yet front-loading is undermined by a vague statement.

Shorter descriptions cost fewer tokens and are easier for agents to parse. Every sentence should earn its place.

Given the tool's complexity, does the description cover enough for an agent to succeed on first attempt?

For an opaque authorization endpoint with an arbitrary body, the description gives only a discovery pointer and no semantic content. It doesn't explain the purpose of the authorize resource or expected interactions, so an agent would still have to guess or fetch schema.

Complex tools with many parameters or behaviors need more documentation. Simple tools need less. This dimension scales expectations accordingly.

Does the description clarify parameter syntax, constraints, interactions, or defaults beyond what the schema provides?

The sole body parameter is an open additionalProperties object with zero schema descriptions; the description says 'Request payload' and points to GET/schema for field discovery. This is some compensation, though it still leaves actual field semantics undisclosed.

Input schemas describe structure but not intent. Descriptions should explain non-obvious parameter relationships and valid value ranges.

Does the description clearly state what the tool does and how it differs from similar tools?

Description says 'Create or act on api authorize' plus the endpoint, which mostly restates the tool's name and gives no concrete operation. It doesn't clarify what authorizing does or how it differs from siblings like patch_auth_settings or create_session_local.

Agents choose between tools based on descriptions. A clear purpose with a specific verb and resource helps agents select the right tool.

Does the description explain when to use this tool, when not to, or what alternatives exist?

No guidance about when to use this tool versus alternatives, no exclusions or prerequisites. The only instruction is to read GET/schema, which is about payload discovery, not usage context.

Agents often have multiple tools that could apply. Explicit usage guidance like "use X instead of Y when Z" prevents misuse.

Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?

Annotations already indicate idempotentHint=true, readOnlyHint=false, and destructiveHint=false, and the description does not contradict them. The description adds the endpoint and a discovery instruction for the payload, but it does not disclose any additional behavioral traits such as overwrite semantics, response status, or required permissions. With annotations covering the safety profile, a 3 is appropriate.

Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.

Is the description appropriately sized, front-loaded, and free of redundancy?

The description is short and front-loaded with the purpose. The endpoint line adds useful precision, and the Args section is compact. Minor redundancy like 'to the server' and 'Request payload' does not significantly hurt, but the description is not maximally tight.

Shorter descriptions cost fewer tokens and are easier for agents to parse. Every sentence should earn its place.

Given the tool's complexity, does the description cover enough for an agent to succeed on first attempt?

The description is adequate for a two-parameter tool with annotations and an output schema. It tells the agent how to handle the uncertain body schema by pointing to the GET and /schema endpoints. However, for an image-related write operation, it leaves ambiguity about content type or body format, and the 'matching GET' reference may not directly describe the create payload. Overall it is usable but not fully complete.

Complex tools with many parameters or behaviors need more documentation. Simple tools need less. This dimension scales expectations accordingly.

Does the description clarify parameter syntax, constraints, interactions, or defaults beyond what the schema provides?

Schema coverage is 0%, so the description must compensate. It does meaningfully: 'id: Path parameter' clarifies the role of id, and 'body: Request payload' plus the instruction to read the matching GET or /schema endpoint gives the agent a concrete path to discover the otherwise opaque body fields. This goes beyond the bare schema even though it does not enumerate the fields itself.

Input schemas describe structure but not intent. Descriptions should explain non-obvious parameter relationships and valid value ranges.

Does the description clearly state what the tool does and how it differs from similar tools?

The description opens with a specific verb and resource: 'Add an author image to the server.' This clearly identifies the action and target, and the explicit POST /api/authors/{id}/image endpoint reinforces it. It is easily distinguished from siblings like get_authors_by_id_image and delete_authors_by_id_image.

Agents choose between tools based on descriptions. A clear purpose with a specific verb and resource helps agents select the right tool.

Does the description explain when to use this tool, when not to, or what alternatives exist?

No guidance is given about when to use this tool versus alternatives such as get_authors_by_id_image, delete_authors_by_id_image, or patch_authors_by_id. The note about reading the matching GET or /schema endpoint is about constructing the body, not about tool selection, so the intended usage context is left implicit.

Agents often have multiple tools that could apply. Explicit usage guidance like "use X instead of Y when Z" prevents misuse.

Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?

Annotations already declare readOnlyHint=false, destructiveHint=false, and idempotentHint=true, so the description doesn't need to restate those. However, it adds little beyond the obvious POST implies a mutation. It doesn't explain side effects (e.g., updating author metadata), what happens on a successful match, or any auth/rate-limit requirements. The advice to read the schema endpoint is useful but doesn't disclose behavioral traits.

Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.

Is the description appropriately sized, front-loaded, and free of redundancy?

The description is short and front-loaded with the purpose. It includes the HTTP method and path, which is redundant but helpful for context. It then lists the two parameters with brief notes. Every line earns its place; there is no fluff. It could be slightly more structured, but it is efficient.

Shorter descriptions cost fewer tokens and are easier for agents to parse. Every sentence should earn its place.

Given the tool's complexity, does the description cover enough for an agent to succeed on first attempt?

For a mutation tool with an open body schema and no output schema visible, the description is incomplete. It doesn't explain what 'quick match' does, what the response looks like, or any prerequisites beyond reading the schema endpoint. It also doesn't mention idempotency or side effects, even though annotations hint at these. An agent would likely need to consult external documentation to use it safely.

Complex tools with many parameters or behaviors need more documentation. Simple tools need less. This dimension scales expectations accordingly.

Does the description clarify parameter syntax, constraints, interactions, or defaults beyond what the schema provides?

Schema coverage is 0% for the body parameter, which is just an open object. The description compensates by telling the agent to read the matching GET or /schema endpoint to learn the expected fields, which is valuable guidance. For 'id', it simply says 'Path parameter,' which is self-evident from the schema. Overall, the description adds meaningful direction for constructing the body.

Input schemas describe structure but not intent. Descriptions should explain non-obvious parameter relationships and valid value ranges.

Does the description clearly state what the tool does and how it differs from similar tools?

The description states a specific verb and resource: 'Match the author against Audible using quick match.' It clearly indicates the action is matching an author, and the endpoint path is provided, which helps distinguish it from other match tools for items or podcasts. However, it doesn't explicitly differentiate from sibling match tools beyond the resource, so it's not a 5.

Agents choose between tools based on descriptions. A clear purpose with a specific verb and resource helps agents select the right tool.

Does the description explain when to use this tool, when not to, or what alternatives exist?

No guidance is given about when to use this tool versus alternatives. It does instruct the user to read the matching GET or /schema endpoint first, which is a prerequisite, but there is no mention of conditions or exclusions that would route an agent to a different match tool. The description lacks any 'when not to use' or comparison with siblings.

Agents often have multiple tools that could apply. Explicit usage guidance like "use X instead of Y when Z" prevents misuse.

Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?

Annotations already indicate idempotency, non-read-only, and non-destructive behavior. The description adds little beyond that, only restating that the operation creates or acts on backups and showing the HTTP method. It does not explain side effects, outcomes, or any additional behavioral traits, and 'act on' is too vague to be informative.

Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.

Is the description appropriately sized, front-loaded, and free of redundancy?

The description is short and well-organized with the endpoint and argument breakout. The only waste is the ambiguous 'or act on' phrase, which could be removed for clarity.

Shorter descriptions cost fewer tokens and are easier for agents to parse. Every sentence should earn its place.

Given the tool's complexity, does the description cover enough for an agent to succeed on first attempt?

With a single free-form body parameter and an output schema present, the description gives a reasonable discoverability path. Still, it lacks concrete details about what the tool actually does, what success looks like, and how this relates to sibling backup operations.

Complex tools with many parameters or behaviors need more documentation. Simple tools need less. This dimension scales expectations accordingly.

Does the description clarify parameter syntax, constraints, interactions, or defaults beyond what the schema provides?

Schema description coverage is 0%, so the description must compensate. It correctly identifies 'body' as the request payload and directs the agent to consult the matching GET or /schema endpoint for fields, which is useful. However, it does not describe any actual fields or their meaning, leaving significant discovery work to the agent.

Input schemas describe structure but not intent. Descriptions should explain non-obvious parameter relationships and valid value ranges.

Does the description clearly state what the tool does and how it differs from similar tools?

The description states the resource ('api backups') and a verb ('Create'), but the phrase 'or act on' adds ambiguity and doesn't specify the exact operation. It also does not distinguish this tool from the closely related sibling 'create_backups_upload'.

Agents choose between tools based on descriptions. A clear purpose with a specific verb and resource helps agents select the right tool.

Does the description explain when to use this tool, when not to, or what alternatives exist?

The description implies usage when creating backups and instructs the agent to read the matching GET or /schema endpoint first. However, it provides no explicit guidance on when to prefer this tool over alternatives like create_backups_upload, nor any exclusion criteria.

Agents often have multiple tools that could apply. Explicit usage guidance like "use X instead of Y when Z" prevents misuse.

Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?

Annotations already provide idempotentHint, destructiveHint, and readOnlyHint. The description adds no behavioral context beyond 'act on backups upload', which is vague. It does not mention side effects, authentication, or what happens on success/failure. Given the annotations, the description adds minimal value.

Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.

Is the description appropriately sized, front-loaded, and free of redundancy?

The description is short but contains redundant/vague phrasing ('Create or act on') and repeats the endpoint. It could be more concise and front-loaded with the core action. It is not overly long, but lacks precision.

Shorter descriptions cost fewer tokens and are easier for agents to parse. Every sentence should earn its place.

Given the tool's complexity, does the description cover enough for an agent to succeed on first attempt?

The tool has a complex body parameter and an output schema, but the description does not clearly explain what the tool does. It points to schema for fields but leaves the operation itself ambiguous. It also does not relate to backup lifecycle or mention any prerequisites. Incomplete for an agent to confidently invoke.

Complex tools with many parameters or behaviors need more documentation. Simple tools need less. This dimension scales expectations accordingly.

Does the description clarify parameter syntax, constraints, interactions, or defaults beyond what the schema provides?

The description clarifies that 'body' is a request payload and directs the agent to read the schema for field details. This is helpful given the schema has no field documentation (0% coverage). However, it does not describe any actual fields or provide syntax, so it only partially compensates.

Input schemas describe structure but not intent. Descriptions should explain non-obvious parameter relationships and valid value ranges.

Does the description clearly state what the tool does and how it differs from similar tools?

The description states the resource (backups upload) but uses the vague phrase 'Create or act on' which does not specify the exact action. It does not distinguish from sibling tools like create_backups, and the endpoint is merely restated. The verb is present but ambiguous.

Agents choose between tools based on descriptions. A clear purpose with a specific verb and resource helps agents select the right tool.

Does the description explain when to use this tool, when not to, or what alternatives exist?

No guidance on when to use this tool versus alternatives. The only hint is to read the schema, which is about parameter usage, not tool selection. There is no mention of conditions, prerequisites, or exclusions.

Agents often have multiple tools that could apply. Explicit usage guidance like "use X instead of Y when Z" prevents misuse.

Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?

Annotations declare idempotentHint=true and destructiveHint=false, suggesting a non-destructive, repeatable operation, yet the name and endpoint with 'purge' strongly imply deletion. The description does not reconcile this: it never clarifies whether it is destructive or what side effects occur. It does not explain the response shape or error behavior. Given the annotations already cover some traits, the description adds almost no behavioral context and even hints at potential contradiction.

Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.

Is the description appropriately sized, front-loaded, and free of redundancy?

The description is short and gets to the endpoint quickly, but it mixes the endpoint into the prose awkwardly and leaves the explanation fragmented. The instruction to read GET or /schema is useful but could be better structured as a separate note. Overall it is concise but not well-organized.

Shorter descriptions cost fewer tokens and are easier for agents to parse. Every sentence should earn its place.

Given the tool's complexity, does the description cover enough for an agent to succeed on first attempt?

For a tool with a single unstructured body parameter and no output schema explanation, the description is severely lacking. It does not clarify the purpose, the required body, the differences from sibling tools, or the impact of the operation. The agent is left to guess and must go to external documentation. This is far from complete.

Complex tools with many parameters or behaviors need more documentation. Simple tools need less. This dimension scales expectations accordingly.

Does the description clarify parameter syntax, constraints, interactions, or defaults beyond what the schema provides?

The only parameter 'body' is an opaque object with additionalProperties true, and the schema description coverage is 0%. The description simply says 'Request payload' and tells the user to read the GET or /schema endpoint to discover fields. This is not helpful; it places the entire documentation burden on external endpoints. There is no attempt to describe likely body properties or give an example.

Input schemas describe structure but not intent. Descriptions should explain non-obvious parameter relationships and valid value ranges.

Does the description clearly state what the tool does and how it differs from similar tools?

The description says 'Create or act on items purge' and shows the endpoint POST /api/cache/items/purge dropped into the middle of prose. It is not a clean verb+resource statement; 'Create or act on' is vague and 'purge' is ambiguous (is it a noun or a verb?). Since the sibling create_cache_purge exists, the phrase 'items purge' weakly distinguishes it, but the purpose is still unclear without inferring it is a cache purge operation.

Agents choose between tools based on descriptions. A clear purpose with a specific verb and resource helps agents select the right tool.

Does the description explain when to use this tool, when not to, or what alternatives exist?

There is no guidance on when to use this tool versus the sibling create_cache_purge, nor any mention of alternatives or prerequisites. The only hint is the endpoint path, which the agent might not understand. The instruction to read the GET or /schema endpoint first is generic and does not clarify when to call this purge.

Agents often have multiple tools that could apply. Explicit usage guidance like "use X instead of Y when Z" prevents misuse.

Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?

Annotations already indicate idempotentHint=true, readOnlyHint=false, and destructiveHint=false, but the description adds no behavioral context about what a purge does, whether it invalidates immediately, what gets cleared, or any side effects. It does not contradict the annotations, but it also provides no additional transparency.

Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.

Is the description appropriately sized, front-loaded, and free of redundancy?

The description is short and front-loaded, with no fluff. The endpoint is stated clearly and the parameter guidance is compact, though the opening line is vague and could have been more informative.

Shorter descriptions cost fewer tokens and are easier for agents to parse. Every sentence should earn its place.

Given the tool's complexity, does the description cover enough for an agent to succeed on first attempt?

For a tool with one loosely typed body parameter, no documented fields, and a nearby sibling with a similar name, the description is too incomplete. It does not explain the purpose, effects, required fields, or relationship to create_cache_items_purge, so an agent would struggle to invoke it correctly.

Complex tools with many parameters or behaviors need more documentation. Simple tools need less. This dimension scales expectations accordingly.

Does the description clarify parameter syntax, constraints, interactions, or defaults beyond what the schema provides?

Schema description coverage is 0%, so the description must compensate. It identifies 'body' as the request payload and points to the GET/schema endpoint for fields, which is a small hint, but it does not explain any actual body fields or their meaning. The schema's additionalProperties:true leaves the agent almost entirely unguided.

Input schemas describe structure but not intent. Descriptions should explain non-obvious parameter relationships and valid value ranges.

Does the description clearly state what the tool does and how it differs from similar tools?

The description says 'Create or act on cache purge,' which is vague and largely restates the tool name. The endpoint line 'POST /api/cache/purge' identifies the route but does not clarify what the operation actually does or what 'act on' means.

Agents choose between tools based on descriptions. A clear purpose with a specific verb and resource helps agents select the right tool.

Does the description explain when to use this tool, when not to, or what alternatives exist?

No guidance is given about when to use this tool versus alternatives such as create_cache_items_purge. The advice to 'Read the matching GET or the /schema endpoint first' concerns how to discover fields, not when to select this tool.

Agents often have multiple tools that could apply. Explicit usage guidance like "use X instead of Y when Z" prevents misuse.

Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?

Annotations already cover idempotency, non-read-only, and non-destructive behavior. The description adds little beyond 'Create or act on' and the endpoint, and does not clarify side effects, authentication needs, or what 'act on' entails. It does not contradict the annotations, but it also does not meaningfully enrich them.

Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.

Is the description appropriately sized, front-loaded, and free of redundancy?

The description is brief and front-loaded with the resource and endpoint, then provides argument guidance. Every sentence serves a purpose, though the phrasing could be more specific.

Shorter descriptions cost fewer tokens and are easier for agents to parse. Every sentence should earn its place.

Given the tool's complexity, does the description cover enough for an agent to succeed on first attempt?

For a create operation with a free-form body, the description should specify how to determine the required fields and what actions the endpoint supports. It points to external schema resources but leaves 'matching GET' ambiguous and does not clarify the intended use cases relative to sibling tools.

Complex tools with many parameters or behaviors need more documentation. Simple tools need less. This dimension scales expectations accordingly.

Does the description clarify parameter syntax, constraints, interactions, or defaults beyond what the schema provides?

The schema offers no field descriptions, and the description only says 'body: Request payload' and advises reading the GET or /schema endpoint for expected fields. This pointer is helpful but vague—it does not identify which GET endpoint, list any fields, or explain the body structure beyond what the schema already states.

Input schemas describe structure but not intent. Descriptions should explain non-obvious parameter relationships and valid value ranges.

Does the description clearly state what the tool does and how it differs from similar tools?

The description states the verb 'Create' and the resource 'api collections', so the core action is identifiable. However, the vague alternative 'or act on' broadens the meaning without explaining what other actions are possible, and it does not distinguish this tool from sibling create_collections_by_id_batch_add or patch_collections_by_id.

Agents choose between tools based on descriptions. A clear purpose with a specific verb and resource helps agents select the right tool.

Does the description explain when to use this tool, when not to, or what alternatives exist?

No guidance is given for when to use this tool versus the many sibling collection tools. The only instruction is to read the matching GET or /schema endpoint, which concerns body construction rather than tool selection.

Agents often have multiple tools that could apply. Explicit usage guidance like "use X instead of Y when Z" prevents misuse.

Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?

The description provides no behavioral details beyond the annotations. It doesn't mention idempotency (though annotations do), response format, or any side effects. It does not state what happens on success or failure, or whether authentication is required.

Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.

Is the description appropriately sized, front-loaded, and free of redundancy?

The description is concise and follows a clear structure with endpoint and args. However, the opening sentence 'Create or act on batch add' is vague and could be clearer. It is not overly verbose, but it sacrifices clarity for brevity.

Shorter descriptions cost fewer tokens and are easier for agents to parse. Every sentence should earn its place.

Given the tool's complexity, does the description cover enough for an agent to succeed on first attempt?

Given the operation's complexity (POST with a body), the description is insufficient. It doesn't explain what the batch add operation entails, what the body should contain, or what the expected outcome is. The existence of an output schema mitigates the need to describe return values, but the core purpose remains undefined.

Complex tools with many parameters or behaviors need more documentation. Simple tools need less. This dimension scales expectations accordingly.

Does the description clarify parameter syntax, constraints, interactions, or defaults beyond what the schema provides?

The schema has 0% description coverage, and the description only labels id as a path parameter and body as a request payload. It directs the user to read the GET/schema endpoint for fields, but does not describe any actual parameters or their meanings.

Input schemas describe structure but not intent. Descriptions should explain non-obvious parameter relationships and valid value ranges.

Does the description clearly state what the tool does and how it differs from similar tools?

The description says 'Create or act on batch add' and provides the endpoint, but does not clarify what 'batch add' does. It is not clear whether this adds items to a collection, updates items, or something else. The name and endpoint suggest adding multiple items, but the description lacks a clear verb-resource statement.

Agents choose between tools based on descriptions. A clear purpose with a specific verb and resource helps agents select the right tool.

Does the description explain when to use this tool, when not to, or what alternatives exist?

There is no guidance on when to use this tool versus alternatives like create_collections_by_id_batch_remove or create_playlists_by_id_batch_add. The description only instructs to read the GET/schema endpoint for field details, which is a prerequisite, not usage guidance.

Agents often have multiple tools that could apply. Explicit usage guidance like "use X instead of Y when Z" prevents misuse.

Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?

Annotations already indicate readOnlyHint=false and idempotentHint=true, and the description adds little beyond that. It says 'act on batch remove' but doesn't disclose what gets removed, whether it's reversible, or any side effects. The wording is confusing and doesn't clarify the operation's nature.

Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.

Is the description appropriately sized, front-loaded, and free of redundancy?

The description is short but poorly structured: the first sentence is confusing ('Create or act on batch remove'), and important context is buried. It doesn't front-load the key purpose and provides only a generic schema-reading note.

Shorter descriptions cost fewer tokens and are easier for agents to parse. Every sentence should earn its place.

Given the tool's complexity, does the description cover enough for an agent to succeed on first attempt?

For a tool with an unstructured body and no parameter documentation, the description is insufficient. It tells the agent to look elsewhere for fields, but doesn't provide enough context about the operation's effect or prerequisites. The output schema exists, but the description doesn't leverage it.

Complex tools with many parameters or behaviors need more documentation. Simple tools need less. This dimension scales expectations accordingly.

Does the description clarify parameter syntax, constraints, interactions, or defaults beyond what the schema provides?

With 0% schema coverage, the description must compensate, but it only labels id as 'Path parameter' and body as 'Request payload' without explaining required fields or structure. The advice to read the schema is not a substitute for semantic description.

Input schemas describe structure but not intent. Descriptions should explain non-obvious parameter relationships and valid value ranges.

Does the description clearly state what the tool does and how it differs from similar tools?

The description says 'Create or act on batch remove' which is vague and misleading; it doesn't clearly state that this tool removes items from a collection. The endpoint path hints at batch removal, but the purpose is not articulated distinctly from siblings like batch_add or delete_collections_by_id.

Agents choose between tools based on descriptions. A clear purpose with a specific verb and resource helps agents select the right tool.

Does the description explain when to use this tool, when not to, or what alternatives exist?

Only guidance is 'Read the matching GET or the /schema endpoint first' – it tells the agent to consult external resources but doesn't explain when to use this tool vs. single-item delete or batch add. No alternative tools are mentioned or excluded.

Agents often have multiple tools that could apply. Explicit usage guidance like "use X instead of Y when Z" prevents misuse.

Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?

Annotations already cover readOnly=false, idempotent=true, destructive=false. The description adds no additional behavioral context, such as what the action actually does, side effects, or prerequisites. It doesn't contradict the annotations, but it also doesn't enrich the agent's understanding beyond what structured fields provide.

Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.

Is the description appropriately sized, front-loaded, and free of redundancy?

The description is concise and well-structured: purpose line, endpoint, and argument list. It avoids unnecessary verbosity and front-loads the endpoint. However, conciseness here comes at the cost of informativeness.

Shorter descriptions cost fewer tokens and are easier for agents to parse. Every sentence should earn its place.

Given the tool's complexity, does the description cover enough for an agent to succeed on first attempt?

Despite having an output schema and nested objects, the description fails to explain the core action. An agent cannot determine what 'act on collections book' does, what the expected body shape is, or what the return value represents. The note to read the schema is a workaround but not a substitute for describing the tool's function.

Complex tools with many parameters or behaviors need more documentation. Simple tools need less. This dimension scales expectations accordingly.

Does the description clarify parameter syntax, constraints, interactions, or defaults beyond what the schema provides?

Schema description coverage is 0%, so the description is the only source for parameter meaning, but it only says 'id: Path parameter' and 'body: Request payload'. This is tautological and does not explain what id represents (collection ID?) or what body should contain. It defers to external schema endpoints, which is insufficient.

Input schemas describe structure but not intent. Descriptions should explain non-obvious parameter relationships and valid value ranges.

Does the description clearly state what the tool does and how it differs from similar tools?

The description says 'Create or act on collections book' which is vague and largely restates the tool name. It doesn't specify what the 'book' action does (e.g., adding a book to a collection, marking as read, etc.), and it doesn't distinguish from siblings like create_collections or create_collections_by_id_batch_add. The endpoint path gives some context, but the purpose remains unclear.

Agents choose between tools based on descriptions. A clear purpose with a specific verb and resource helps agents select the right tool.

Does the description explain when to use this tool, when not to, or what alternatives exist?

The description instructs to 'Read the matching GET or the /schema endpoint first to see the fields this resource expects', which is a useful precondition but not about when to choose this tool over alternatives. It provides no guidance on scenarios where this should be used instead of batch_add or patch operations.

Agents often have multiple tools that could apply. Explicit usage guidance like "use X instead of Y when Z" prevents misuse.

Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?

Annotations already convey readOnlyHint=false and idempotentHint=true; the description does not contradict them. It adds some value by revealing that the body schema must be discovered via GET or /schema, but it does not explain side effects, whether the operation can create multiple providers, or what 'act on' means.

Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.

Is the description appropriately sized, front-loaded, and free of redundancy?

The description is short and organized into endpoint, args, and guidance. It avoids unnecessary detail, but the vague 'Create or act on' phrasing and the semi-redundant endpoint line keep it from being maximally tight.

Shorter descriptions cost fewer tokens and are easier for agents to parse. Every sentence should earn its place.

Given the tool's complexity, does the description cover enough for an agent to succeed on first attempt?

For a tool with one free-form body parameter and an existing output schema, the description includes the crucial prerequisite (read GET/schema first) and the endpoint. It is complete enough for an agent to construct a request, though the ambiguous action semantics and lack of alternative guidance remain minor gaps.

Complex tools with many parameters or behaviors need more documentation. Simple tools need less. This dimension scales expectations accordingly.

Does the description clarify parameter syntax, constraints, interactions, or defaults beyond what the schema provides?

With 0% schema description coverage, the description compensates by identifying `body` as the request payload and directing the agent to the GET or /schema endpoint to learn the expected fields. This is useful because the body is an open object (`additionalProperties: true`), though it still omits concrete field examples.

Input schemas describe structure but not intent. Descriptions should explain non-obvious parameter relationships and valid value ranges.

Does the description clearly state what the tool does and how it differs from similar tools?

The description identifies the resource (`custom-metadata-providers`) and includes a `POST` path, so an agent can tell this is the creation endpoint. However, the phrase 'Create or act on' is vague—'act on' does not specify what action is performed or what creating a provider entails, and it does not differentiate this tool from sibling list/delete providers beyond the HTTP path.

Agents choose between tools based on descriptions. A clear purpose with a specific verb and resource helps agents select the right tool.

Does the description explain when to use this tool, when not to, or what alternatives exist?

There is no statement about when to use this tool versus alternatives such as list_custom_metadata_providers or delete_custom_metadata_providers_by_id. The only guidance is the prerequisite to read the matching GET or /schema endpoint first, which helps with invocation but not tool selection.

Agents often have multiple tools that could apply. Explicit usage guidance like "use X instead of Y when Z" prevents misuse.

Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?

Annotations already declare idempotentHint=true, destructiveHint=false, and readOnlyHint=false, so the safety profile is covered. The description adds the instruction to read the GET/schema first, which is a useful behavioral hint about how to discover the request format. However, it does not disclose other behavioral traits such as what happens if the device does not exist (e.g., does it create or error), whether this operation affects existing devices, or what the response contains. The 'Update' behavior is mentioned but conflicts with the tool name's 'create' prefix, which is a transparency issue.

Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.

Is the description appropriately sized, front-loaded, and free of redundancy?

The description is concise, using two sentences and a structured 'Args:' block. It front-loads the core action ('Update e-reader devices.') and includes the full endpoint URL, making it easy to scan. The structure is efficient, though the brevity sacrifices necessary details, which is factored into other dimensions.

Shorter descriptions cost fewer tokens and are easier for agents to parse. Every sentence should earn its place.

Given the tool's complexity, does the description cover enough for an agent to succeed on first attempt?

The tool has one complex object parameter, an output schema exists, and there are many related siblings. The description only instructs to read the GET/schema for fields, which is helpful but insufficient for context. It does not explain what an e-reader device is in this context, how it relates to email, or how it differs from 'create_me_ereader_devices'. The name-description mismatch adds ambiguity. An agent would need additional inference or external knowledge to use this correctly.

Complex tools with many parameters or behaviors need more documentation. Simple tools need less. This dimension scales expectations accordingly.

Does the description clarify parameter syntax, constraints, interactions, or defaults beyond what the schema provides?

The schema has only a 'body' parameter with additionalProperties: true, essentially a free-form object with no described fields (0% coverage). The description says 'body: Request payload. Read the matching GET or the /schema endpoint first to see the fields this resource expects.' This provides meaningful guidance on how to determine the actual fields, compensating for the lack of schema detail. While it does not list any specific fields, it directs the agent to a discovery mechanism, which is useful but not complete.

Input schemas describe structure but not intent. Descriptions should explain non-obvious parameter relationships and valid value ranges.

Does the description clearly state what the tool does and how it differs from similar tools?

The description states 'Update e-reader devices.' and provides the endpoint POST /api/emails/ereader-devices, which clearly specifies an action and resource. However, the tool name is 'create_emails_ereader_devices' while the description says 'Update', creating a mismatch that could confuse an agent. Additionally, it does not differentiate this tool from closely named siblings like 'create_me_ereader_devices' or 'create_emails_send_ebook_to_device', so the purpose is not fully unambiguous.

Agents choose between tools based on descriptions. A clear purpose with a specific verb and resource helps agents select the right tool.

Does the description explain when to use this tool, when not to, or what alternatives exist?

The description gives no guidance on when to use this tool versus alternatives. It only instructs the agent to read the matching GET or /schema endpoint before sending the body, which is a usage hint for constructing the request but not for choosing this tool over others. There is no mention of exclusions or comparisons to sibling tools.

Agents often have multiple tools that could apply. Explicit usage guidance like "use X instead of Y when Z" prevents misuse.

Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?

Annotations already declare the operation is not readOnly, is idempotent, and is not destructive, so the description does not need to repeat those traits. The description adds the 'send' behavior and the requirement to discover fields, but it discloses no side effects, prerequisites, or response behavior beyond what annotations and output schema already provide.

Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.

Is the description appropriately sized, front-loaded, and free of redundancy?

The description is compact: a one-line action, the endpoint, and a short args note. It is front-loaded with the most important information and contains no filler. It could be slightly more informative without becoming bloated, but the structure is efficient.

Shorter descriptions cost fewer tokens and are easier for agents to parse. Every sentence should earn its place.

Given the tool's complexity, does the description cover enough for an agent to succeed on first attempt?

Given an opaque body schema, no field descriptions, and many related sibling tools, the description is not complete enough for an agent to confidently construct the request payload or know when this tool is the right choice. It does direct the agent to the schema endpoint, which mitigates the gap, but it leaves key usage context unresolved.

Complex tools with many parameters or behaviors need more documentation. Simple tools need less. This dimension scales expectations accordingly.

Does the description clarify parameter syntax, constraints, interactions, or defaults beyond what the schema provides?

Schema coverage is 0% and the body parameter is an opaque object with additionalProperties: true. The description identifies body as the request payload and points to the GET or /schema endpoint for field discovery, but it supplies no concrete parameter semantics or field details. This is a helpful pointer rather than actual semantic coverage.

Input schemas describe structure but not intent. Descriptions should explain non-obvious parameter relationships and valid value ranges.

Does the description clearly state what the tool does and how it differs from similar tools?

The description states a clear action and resource: 'Send ebook to device.' This is distinguishable from sibling tools like create_emails_ereader_devices, which manage devices, and create_emails_test, which tests email settings. However, it does not explicitly differentiate itself or clarify what 'device' means in this context.

Agents choose between tools based on descriptions. A clear purpose with a specific verb and resource helps agents select the right tool.

Does the description explain when to use this tool, when not to, or what alternatives exist?

The description gives an explicit prerequisite: 'Read the matching GET or the /schema endpoint first to see the fields this resource expects.' This tells the agent how to prepare, but it does not explain when to select this tool over alternatives such as create_emails_ereader_devices or list_emails_settings.

Agents often have multiple tools that could apply. Explicit usage guidance like "use X instead of Y when Z" prevents misuse.

Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?

Annotations already declare idempotentHint=true and destructiveHint=false, so the safety profile is covered by structured data. The description's only additional behavioral disclosure is that the body fields are discoverable via GET or /schema — a small hint about API discoverability. It does not disclose what sending a test email actually does (e.g., whether it sends to the configured address, whether it fails fast if SMTP is unconfigured, whether it persists anything). No contradiction with annotations, but minimal added behavioral value.

Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.

Is the description appropriately sized, front-loaded, and free of redundancy?

The description is tightly structured and front-loaded: purpose first ('Send test email'), then the HTTP endpoint, then the parameter note. Every line earns its place, and the parameter guidance is appropriately brief. No redundant phrasing or restatement of the tool name.

Shorter descriptions cost fewer tokens and are easier for agents to parse. Every sentence should earn its place.

Given the tool's complexity, does the description cover enough for an agent to succeed on first attempt?

For a one-parameter tool with an output schema and annotations covering idempotency/non-destructiveness, the description covers the basics: purpose, endpoint, and how to discover the payload. However, it never explains the real-world purpose of a test email (verifying that email/notification settings work), nor what a successful response means for the caller. These gaps are moderate for such a simple tool, making it adequate but not complete.

Complex tools with many parameters or behaviors need more documentation. Simple tools need less. This dimension scales expectations accordingly.

Does the description clarify parameter syntax, constraints, interactions, or defaults beyond what the schema provides?

Schema description coverage is 0% and the single body parameter is an opaque object with additionalProperties: true, so the schema alone is nearly useless. The description partially compensates by labeling body as 'Request payload' and directing the agent to the matching GET or /schema endpoint for field discovery. This is a helpful pointer, but it stops short of enumerating any actual fields, so the agent still needs at least one additional call to understand the payload.

Input schemas describe structure but not intent. Descriptions should explain non-obvious parameter relationships and valid value ranges.

Does the description clearly state what the tool does and how it differs from similar tools?

The description states a specific verb and resource ('Send test email') that distinguishes it from email-related siblings like create_emails_send_ebook_to_device and create_emails_ereader_devices. Including the exact endpoint (POST /api/emails/test) further anchors the tool's identity. It loses the fifth point only because it never clarifies what 'test' validates (e.g., verifying SMTP settings) — a nuance an agent selecting this tool would benefit from.

Agents choose between tools based on descriptions. A clear purpose with a specific verb and resource helps agents select the right tool.

Does the description explain when to use this tool, when not to, or what alternatives exist?

The description offers procedural guidance ('Read the matching GET or the /schema endpoint first to see the fields this resource expects'), which is useful for constructing the request correctly. However, it provides no explicit when-to-use context versus alternatives — there is no statement of when sending a test email is appropriate (e.g., after configuring email settings) or which sibling handles other email operations. Usage context is only implied by the tool's name.

Agents often have multiple tools that could apply. Explicit usage guidance like "use X instead of Y when Z" prevents misuse.

Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?

Annotations already declare this as non-read-only, idempotent, and non-destructive. The description adds only the endpoint URL and a pointer to schema for the body, but does not explain the action's effect, permission requirements, or state changes. With annotations present, the description still fails to provide meaningful behavioral context.

Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.

Is the description appropriately sized, front-loaded, and free of redundancy?

The description is compact and well-structured with a URL and Args section, containing no wasted words. However, it is under-specified: the opening purpose sentence is too vague, and brevity comes at the cost of clarity.

Shorter descriptions cost fewer tokens and are easier for agents to parse. Every sentence should earn its place.

Given the tool's complexity, does the description cover enough for an agent to succeed on first attempt?

The tool has an arbitrary object body and a domain-specific action ('close'), but the description lacks any explanation of what the action does, when it is appropriate, or side effects. It relies entirely on the schema pointer and annotations, which is insufficient for correct invocation.

Complex tools with many parameters or behaviors need more documentation. Simple tools need less. This dimension scales expectations accordingly.

Does the description clarify parameter syntax, constraints, interactions, or defaults beyond what the schema provides?

With schema description coverage at 0%, the description compensates slightly by labeling id as a path parameter and body as the request payload, and by instructing to read the matching GET or /schema endpoint for expected fields. This adds some meaning beyond the bare schema, though the actual body structure remains unspecified.

Input schemas describe structure but not intent. Descriptions should explain non-obvious parameter relationships and valid value ranges.

Does the description clearly state what the tool does and how it differs from similar tools?

The description says 'Create or act on feeds close,' which is vague and nearly restates the tool name. It provides the URL POST /api/feeds/{id}/close, hinting at a close action, but never defines what 'close' means in this domain or distinguishes it from the many feed-related sibling tools like create_feeds_*_open.

Agents choose between tools based on descriptions. A clear purpose with a specific verb and resource helps agents select the right tool.

Does the description explain when to use this tool, when not to, or what alternatives exist?

There is no guidance on when to use this tool versus alternatives. The only instruction is to read the matching GET or /schema endpoint for the body payload, which addresses parameter discovery, not usage selection. No exclusions or alternative tools are mentioned.

Agents often have multiple tools that could apply. Explicit usage guidance like "use X instead of Y when Z" prevents misuse.

Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?

Annotations already indicate idempotentHint=true and destructiveHint=false, but the description adds no behavioral context such as side effects, authorization needs, or what 'acting on collection open' entails. It does not contradict the annotations, but it also does not meaningfully extend them.

Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.

Is the description appropriately sized, front-loaded, and free of redundancy?

The description is short and includes a structured Args section with little fluff. However, the opening phrase 'Create or act on collection open' is vague and does not earn its place as a clarifying statement.

Shorter descriptions cost fewer tokens and are easier for agents to parse. Every sentence should earn its place.

Given the tool's complexity, does the description cover enough for an agent to succeed on first attempt?

The description leaves the core semantics of the 'open' action unexplained and provides no usage context relative to sibling feed tools. The pointer to GET/schema helps with body discovery, but the overall operational picture is incomplete for an agent deciding whether and how to invoke this tool.

Complex tools with many parameters or behaviors need more documentation. Simple tools need less. This dimension scales expectations accordingly.

Does the description clarify parameter syntax, constraints, interactions, or defaults beyond what the schema provides?

The description identifies collection_id as a path parameter and body as the request payload, which adds modest context over the bare schema. The instruction to read the matching GET or /schema endpoint for expected fields is useful given that body is an open object with 0% schema description coverage, but it does not explain concrete parameter values.

Input schemas describe structure but not intent. Descriptions should explain non-obvious parameter relationships and valid value ranges.

Does the description clearly state what the tool does and how it differs from similar tools?

The description says "Create or act on collection open," which is vague and largely restates the tool name without defining what 'open' means or what effect it has on the collection. The endpoint path clarifies the resource but does not explain the operation's purpose or distinguish it from sibling open/close feed tools.

Agents choose between tools based on descriptions. A clear purpose with a specific verb and resource helps agents select the right tool.

Does the description explain when to use this tool, when not to, or what alternatives exist?

There is no guidance about when to use this tool versus alternatives such as create_feeds_by_id_close or create_feeds_item_by_item_id_open. The only operational advice is to read the matching GET or /schema endpoint first, which is a preparation step, not a selection criterion.

Agents often have multiple tools that could apply. Explicit usage guidance like "use X instead of Y when Z" prevents misuse.

Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?

Annotations tell us the operation is not read-only, is idempotent, and is not destructive, but the description adds little behavioral context beyond the vague "Create or act." It does not explain what side effect occurs, whether authentication is required, or what retrying the operation might imply. No contradiction with annotations exists, but the description carries almost no behavioral weight.

Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.

Is the description appropriately sized, front-loaded, and free of redundancy?

The description is short and includes the endpoint and parameter list in a scannable format. The pointer to the GET/schema endpoint is useful and avoids duplicating schema details. Minor waste exists in the vague "Create or act" phrasing, but overall it is compact.

Shorter descriptions cost fewer tokens and are easier for agents to parse. Every sentence should earn its place.

Given the tool's complexity, does the description cover enough for an agent to succeed on first attempt?

Even though an output schema exists, the input contract is underspecified: body is a free-form object and the description defers entirely to other endpoints. The tool's actual purpose remains unclear, and there is no guidance about which feed items are valid or what "open" means in this domain. This is not enough context for an agent to use the tool confidently.

Complex tools with many parameters or behaviors need more documentation. Simple tools need less. This dimension scales expectations accordingly.

Does the description clarify parameter syntax, constraints, interactions, or defaults beyond what the schema provides?

Schema description coverage is 0%, so the description must compensate, but it only labels item_id as a path parameter and body as a request payload. It directs agents to read a GET or /schema endpoint for body fields, which is helpful but does not explain the expected fields or their meaning. The description fails to give meaningful semantics for either parameter.

Input schemas describe structure but not intent. Descriptions should explain non-obvious parameter relationships and valid value ranges.

Does the description clearly state what the tool does and how it differs from similar tools?

The description says "Create or act on item open," which is vague and essentially restates the tool name without explaining what opening an item means. The endpoint path suggests a POST to mark an item as open, but the description never states the effect or resource semantics clearly. It does not distinguish this from sibling tools like create_feeds_by_id_close or create_feeds_collection_by_collection_id_open.

Agents choose between tools based on descriptions. A clear purpose with a specific verb and resource helps agents select the right tool.

Does the description explain when to use this tool, when not to, or what alternatives exist?

There is no guidance on when to use this tool versus the many sibling feed/open/close tools. The instruction to read the matching GET or /schema endpoint is about payload discovery, not about choosing this tool over alternatives. The description provides no context for when this action is appropriate.

Agents often have multiple tools that could apply. Explicit usage guidance like "use X instead of Y when Z" prevents misuse.

Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?

Annotations already communicate idempotency and non-destructiveness, but the description adds little behavioral context. It does not explain what state changes 'open' causes, whether it affects feed subscriptions, what options exist in the body, or what the response indicates.

Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.

Is the description appropriately sized, front-loaded, and free of redundancy?

The description is appropriately short and includes the endpoint and an Args list, so it is not bloated. However, the first sentence is vague and the organization is minimal; the space could have been better used to describe the operation's meaning.

Shorter descriptions cost fewer tokens and are easier for agents to parse. Every sentence should earn its place.

Given the tool's complexity, does the description cover enough for an agent to succeed on first attempt?

For an action-oriented endpoint with an opaque body object and no field documentation, the description is incomplete. It lacks the core semantics of the operation, any selection criteria relative to sibling tools, and any behavioral side effects. The output schema existing reduces return-value burden, but the description still does not equip an agent to call this tool confidently.

Complex tools with many parameters or behaviors need more documentation. Simple tools need less. This dimension scales expectations accordingly.

Does the description clarify parameter syntax, constraints, interactions, or defaults beyond what the schema provides?

The input schema has 0% description coverage, so the description must compensate. It does add minimal useful semantics by identifying series_id as a path parameter and body as the request payload, plus it points the agent to the GET or /schema endpoint to learn expected fields. This is helpful but still leaves the actual body structure undisclosed.

Input schemas describe structure but not intent. Descriptions should explain non-obvious parameter relationships and valid value ranges.

Does the description clearly state what the tool does and how it differs from similar tools?

The description says only 'Create or act on series open', which essentially restates the tool name without defining what 'open' means as an operation. The HTTP path adds endpoint specificity, but the semantic purpose remains vague and does not distinguish this from the many sibling open/close feed tools.

Agents choose between tools based on descriptions. A clear purpose with a specific verb and resource helps agents select the right tool.

Does the description explain when to use this tool, when not to, or what alternatives exist?

No guidance is given for when to use this tool versus siblings like create_feeds_collection_by_collection_id_open or create_feeds_by_id_close. The only usage hint is to read the matching GET or /schema endpoint first, which is generic rather than a clear when-to-use rule.

Agents often have multiple tools that could apply. Explicit usage guidance like "use X instead of Y when Z" prevents misuse.

Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?

Annotations indicate readOnlyHint:false, idempotentHint:true, destructiveHint:false, but the description adds no behavioral context. It does not explain what the tool does (e.g., checks path existence, creates a record, etc.), whether it has side effects, or what the response looks like. With such minimal annotations, the description carries the full burden and fails to disclose any behavior beyond the endpoint.

Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.

Is the description appropriately sized, front-loaded, and free of redundancy?

The description is short (two lines) but under-specified rather than concise. It lacks essential information, so brevity is not a virtue here. The structure is minimal but does not front-load useful details; it only gives a generic 'Create or act' and an endpoint.

Shorter descriptions cost fewer tokens and are easier for agents to parse. Every sentence should earn its place.

Given the tool's complexity, does the description cover enough for an agent to succeed on first attempt?

Given the tool's ambiguous name and the open-ended body parameter, the description is grossly incomplete. It does not explain what the tool accomplishes, what the request body should contain, or what the response will be (even though an output schema exists, the agent cannot infer the input). This is inadequate for an agent to invoke it correctly.

Complex tools with many parameters or behaviors need more documentation. Simple tools need less. This dimension scales expectations accordingly.

Does the description clarify parameter syntax, constraints, interactions, or defaults beyond what the schema provides?

The only parameter is 'body' which is an open object (additionalProperties true) with no schema description. Schema coverage is 0%. The description tells the agent to read the GET or /schema endpoint to find fields, deferring responsibility rather than providing any meaning. This provides no value beyond the schema's empty 'body' definition.

Input schemas describe structure but not intent. Descriptions should explain non-obvious parameter relationships and valid value ranges.

Does the description clearly state what the tool does and how it differs from similar tools?

The description says 'Create or act on filesystem pathexists' which is vague and ambiguous. It does not state a specific verb like 'check' or 'verify' and the resource 'pathexists' is not clarified. It gives an endpoint but that alone does not explain the tool's purpose. It does not distinguish from siblings, though none are similar, but it fails to provide a clear function.

Agents choose between tools based on descriptions. A clear purpose with a specific verb and resource helps agents select the right tool.

Does the description explain when to use this tool, when not to, or what alternatives exist?

There is no guidance on when to use this tool vs alternatives. The description does not mention any context, prerequisites, or exclusions. It simply points to the endpoint and tells the agent to read the GET or /schema endpoint, which is not usage guidance.

Agents often have multiple tools that could apply. Explicit usage guidance like "use X instead of Y when Z" prevents misuse.

Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?

Annotations cover idempotentHint=true and destructiveHint=false, so the description does not need to repeat those. However, it provides little extra behavioral context beyond 'Read the matching GET or the /schema endpoint first.' It does not explain what the rename operation does, any side effects, or why idempotency matters here.

Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.

Is the description appropriately sized, front-loaded, and free of redundancy?

The description is concise but the opening sentence is unhelpful and tautological. The endpoint line is useful context, but the overall structure front-loads vagueness rather than the key purpose. It could be shorter and more informative, but the vague phrasing wastes space.

Shorter descriptions cost fewer tokens and are easier for agents to parse. Every sentence should earn its place.

Given the tool's complexity, does the description cover enough for an agent to succeed on first attempt?

For a mutation tool with a nested-body parameter and an output schema, the description is incomplete. It tells the agent to read the schema, but does not provide any context about what the rename does, what fields are expected, or how to construct a valid request. The annotations cover safety, but the behavioral purpose is still unclear.

Complex tools with many parameters or behaviors need more documentation. Simple tools need less. This dimension scales expectations accordingly.

Does the description clarify parameter syntax, constraints, interactions, or defaults beyond what the schema provides?

The input schema has only a single 'body' parameter with additionalProperties:true, and schema description coverage is 0%. The description does not explain any fields or structure, only instructs to fetch the schema. This does not add semantic meaning beyond the schema and leaves the agent to discover details externally.

Input schemas describe structure but not intent. Descriptions should explain non-obvious parameter relationships and valid value ranges.

Does the description clearly state what the tool does and how it differs from similar tools?

The description opens with 'Create or act on genres rename,' which is vague and does not clearly state the operation. The tool name implies renaming a genre, but 'create or act on' is ambiguous. It does not distinguish itself from siblings like create_tags_rename or delete_genres_by_genre.

Agents choose between tools based on descriptions. A clear purpose with a specific verb and resource helps agents select the right tool.

Does the description explain when to use this tool, when not to, or what alternatives exist?

No guidance is given on when to use this tool versus alternatives. There is no mention of when a rename is appropriate, what distinguishes it from create_tags_rename, or any exclusions. The agent is left to infer usage from the name.

Agents often have multiple tools that could apply. Explicit usage guidance like "use X instead of Y when Z" prevents misuse.

Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?

The tool is clearly a batch delete operation (as implied by the endpoint and name), yet the annotations declare destructiveHint=false. The description itself says 'batch delete' but does not disclose that this permanently deletes items, nor does it mention any consequences, permissions, or reversibility. This contradicts the annotations, and the description fails to carry the burden of behavioral disclosure.

Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.

Is the description appropriately sized, front-loaded, and free of redundancy?

The description is extremely short (two sentences), but it lacks a clear structure. It mixes a high-level phrase with an endpoint and a generic schema-reading instruction. While concise, it is under-specified and not front-loaded with the most important information (that this is a destructive batch delete).

Shorter descriptions cost fewer tokens and are easier for agents to parse. Every sentence should earn its place.

Given the tool's complexity, does the description cover enough for an agent to succeed on first attempt?

For a mutation/delete tool, the description is grossly incomplete. It does not specify what items are affected, what the request body must contain, what the response looks like (despite having an output schema), or any conditions or limitations. The annotation idempotentHint=true is not explained, and no guidance on idempotent retries is provided. An agent cannot safely invoke this tool without further investigation.

Complex tools with many parameters or behaviors need more documentation. Simple tools need less. This dimension scales expectations accordingly.

Does the description clarify parameter syntax, constraints, interactions, or defaults beyond what the schema provides?

The schema defines a single 'body' parameter as an open object with additionalProperties, and schema description coverage is 0%. The description only says to read the schema endpoint for expected fields, which is a pointer but not an explanation. It does not describe what the body should contain (e.g., list of item IDs) or any structure, leaving the agent without concrete parameter semantics.

Input schemas describe structure but not intent. Descriptions should explain non-obvious parameter relationships and valid value ranges.

Does the description clearly state what the tool does and how it differs from similar tools?

The description 'Create or act on batch delete' is vague and does not clarify that the tool performs a batch deletion of items. It does not distinguish from sibling tools like create_items_batch_update or delete_items_by_id. The name starts with 'create' which is misleading for a delete operation, and the description does not resolve this ambiguity.

Agents choose between tools based on descriptions. A clear purpose with a specific verb and resource helps agents select the right tool.

Does the description explain when to use this tool, when not to, or what alternatives exist?

The description provides no guidance on when to use this tool versus alternatives such as delete_items_by_id or other batch operations. It only advises reading the schema for the request body, but does not explain the intended use case or prerequisites. No context about selecting this tool over other delete methods is given.

Agents often have multiple tools that could apply. Explicit usage guidance like "use X instead of Y when Z" prevents misuse.

Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?

Annotations provide idempotentHint=true and destructiveHint=false, but the description adds nothing about behavior. It doesn't clarify whether the operation is read-only or mutating, and the phrase 'Create or act' is ambiguous. No side effects or response details are disclosed.

Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.

Is the description appropriately sized, front-loaded, and free of redundancy?

The description is brief but under-specified. It contains two sentences, but they are unhelpful, so it's not effective conciseness; it's just lacking content.

Shorter descriptions cost fewer tokens and are easier for agents to parse. Every sentence should earn its place.

Given the tool's complexity, does the description cover enough for an agent to succeed on first attempt?

The description is extremely incomplete. It doesn't explain what the body should contain, what the response looks like, or how to use the tool effectively. The existence of an output schema is not leveraged, and the description provides no context about the batch get operation.

Complex tools with many parameters or behaviors need more documentation. Simple tools need less. This dimension scales expectations accordingly.

Does the description clarify parameter syntax, constraints, interactions, or defaults beyond what the schema provides?

The only parameter is 'body' with additionalProperties:true and no schema description. The description only says 'Read the matching GET or the /schema endpoint first', which is a pointer, not actual semantics. Since schema coverage is 0%, the description fails to compensate.

Input schemas describe structure but not intent. Descriptions should explain non-obvious parameter relationships and valid value ranges.

Does the description clearly state what the tool does and how it differs from similar tools?

The description says 'Create or act on batch get' which is vague and doesn't clearly state what the tool does. It provides the endpoint but not the operation's purpose, and doesn't distinguish it from siblings like create_items_batch_delete or create_items_batch_update.

Agents choose between tools based on descriptions. A clear purpose with a specific verb and resource helps agents select the right tool.

Does the description explain when to use this tool, when not to, or what alternatives exist?

No guidance is given on when to use this tool versus alternatives. There are many batch operations, and the description doesn't mention conditions or alternatives.

Agents often have multiple tools that could apply. Explicit usage guidance like "use X instead of Y when Z" prevents misuse.

Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?

Annotations provide idempotentHint=true and destructiveHint=false, but the description adds no behavioral detail about what quickmatch actually does, whether it modifies metadata, launches a background job, or returns match candidates. 'Create or act on' is too vague to disclose real behavior beyond what annotations already state.

Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.

Is the description appropriately sized, front-loaded, and free of redundancy?

The description is brief and front-loads the core intent, endpoint, and argument section without rambling. However, the first sentence is vague and could have been replaced with a more specific explanation of the quickmatch operation.

Shorter descriptions cost fewer tokens and are easier for agents to parse. Every sentence should earn its place.

Given the tool's complexity, does the description cover enough for an agent to succeed on first attempt?

Even with an output schema present, the description is not complete enough for an agent to call this tool correctly. The core semantics of quickmatch are undefined, the body schema is opaque, and the only guidance is to look elsewhere. An agent still cannot tell what this endpoint expects or what side effects it produces.

Complex tools with many parameters or behaviors need more documentation. Simple tools need less. This dimension scales expectations accordingly.

Does the description clarify parameter syntax, constraints, interactions, or defaults beyond what the schema provides?

Schema description coverage is 0%, and the only parameter, body, is an opaque object with additionalProperties true. The description says body is the 'request payload' and points to the matching GET or /schema endpoint, but it does not describe any expected fields, structure, or examples. This does not compensate for the total lack of schema documentation.

Input schemas describe structure but not intent. Descriptions should explain non-obvious parameter relationships and valid value ranges.

Does the description clearly state what the tool does and how it differs from similar tools?

The description says 'Create or act on batch quickmatch', which essentially restates the tool name and uses the vague 'act on' instead of a specific action. It does not explain what quickmatch does or distinguish it from siblings like create_items_batch_update, create_items_batch_scan, or create_items_by_id_match.

Agents choose between tools based on descriptions. A clear purpose with a specific verb and resource helps agents select the right tool.

Does the description explain when to use this tool, when not to, or what alternatives exist?

The only usage guidance is 'Read the matching GET or the /schema endpoint first', which is a prerequisite hint, not guidance about when to choose this tool over alternatives. It never states the conditions for using this tool versus create_items_batch_update or create_items_batch_scan.

Agents often have multiple tools that could apply. Explicit usage guidance like "use X instead of Y when Z" prevents misuse.

Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?

The description adds no behavioral detail beyond what the annotations already indicate: readOnlyHint is false and destructiveHint is false, so this is neither a pure read nor a destructive operation. It does not explain side effects, idempotency implications, or what happens when the batch scan runs.

Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.

Is the description appropriately sized, front-loaded, and free of redundancy?

The description is short and reasonably structured with the HTTP method, endpoint, and args clearly separated. However, the opening sentence is vague and contributes little, so the compactness is partly a result of under-specification.

Shorter descriptions cost fewer tokens and are easier for agents to parse. Every sentence should earn its place.

Given the tool's complexity, does the description cover enough for an agent to succeed on first attempt?

Given the open body payload, output schema, and many related batch and scan siblings, the description lacks enough context for reliable invocation. It does not clarify what the scan does, how it differs from related endpoints, or what success or failure looks like.

Complex tools with many parameters or behaviors need more documentation. Simple tools need less. This dimension scales expectations accordingly.

Does the description clarify parameter syntax, constraints, interactions, or defaults beyond what the schema provides?

The body parameter is an open object with no schema descriptions, and the description at least identifies it as the request payload and directs the agent to inspect the matching GET or /schema endpoint for expected fields. This provides a useful discovery path, though it does not describe any concrete fields or structure.

Input schemas describe structure but not intent. Descriptions should explain non-obvious parameter relationships and valid value ranges.

Does the description clearly state what the tool does and how it differs from similar tools?

The phrase 'Create or act on batch scan' essentially restates the tool name without defining what a batch scan does or what 'act' means. The endpoint path clarifies the resource but not the behavior, leaving the agent to guess how this differs from sibling tools like create_items_batch_update or create_items_by_id_scan.

Agents choose between tools based on descriptions. A clear purpose with a specific verb and resource helps agents select the right tool.

Does the description explain when to use this tool, when not to, or what alternatives exist?

There is no guidance on when to use this tool versus alternatives such as create_items_batch_get, create_items_batch_update, or create_items_by_id_scan. The instruction to read the matching GET or /schema endpoint is about payload discovery, not usage context or exclusions.

Agents often have multiple tools that could apply. Explicit usage guidance like "use X instead of Y when Z" prevents misuse.

Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?

Annotations already indicate idempotentHint=true, readOnlyHint=false, and destructiveHint=false, but the description adds almost no behavioral context beyond 'read the schema first.' It does not explain what side effects a batch update has, whether it replaces or merges fields, or what authorization may be required. There is no contradiction with annotations, but the description does not meaningfully supplement them.

Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.

Is the description appropriately sized, front-loaded, and free of redundancy?

The description is short and structurally organized, with the endpoint and args clearly separated. However, the opening sentence 'Create or act on batch update' is vague and mostly redundant with the tool name, so it does not earn its place as the primary purpose statement.

Shorter descriptions cost fewer tokens and are easier for agents to parse. Every sentence should earn its place.

Given the tool's complexity, does the description cover enough for an agent to succeed on first attempt?

For a batch-update operation with an open request body, the description should at least specify what objects are affected, whether the update is partial or full, and how this differs from sibling batch operations. None of that context is present; the description leaves the agent dependent on external schema discovery and sibling-tool inference.

Complex tools with many parameters or behaviors need more documentation. Simple tools need less. This dimension scales expectations accordingly.

Does the description clarify parameter syntax, constraints, interactions, or defaults beyond what the schema provides?

Schema description coverage is 0% and the body parameter is an opaque object with additionalProperties: true. The description labels body as 'Request payload' and points to GET/schema for field discovery, which is somewhat helpful, but it never explains what the payload should represent, such as item IDs or which fields are being updated. This falls short of compensating for the complete lack of schema-level parameter descriptions.

Input schemas describe structure but not intent. Descriptions should explain non-obvious parameter relationships and valid value ranges.

Does the description clearly state what the tool does and how it differs from similar tools?

The description essentially restates the tool name: 'Create or act on batch update' adds no concrete detail about what the operation does. The endpoint path hints that it targets items, but the description never says 'update multiple items' or describes the effect. This is closer to a tautology than a clear purpose statement.

Agents choose between tools based on descriptions. A clear purpose with a specific verb and resource helps agents select the right tool.

Does the description explain when to use this tool, when not to, or what alternatives exist?

No guidance is given about when to use this tool over alternatives such as create_items_batch_delete, create_items_batch_get, or create_items_batch_quickmatch. The only instruction, to read the matching GET or /schema endpoint first, is a prerequisite for parameter discovery rather than a usage criterion.

Agents often have multiple tools that could apply. Explicit usage guidance like "use X instead of Y when Z" prevents misuse.

Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?

Annotations already indicate readOnlyHint=false, destructiveHint=false, and idempotentHint=true, so the safety profile is covered. However, the description adds little behavioral context: it does not explain what 'act on chapters' does, what side effects occur, or whether existing chapters are modified or replaced.

Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.

Is the description appropriately sized, front-loaded, and free of redundancy?

The description is short, front-loads the endpoint, and keeps the parameter notes brief. Its only real defect is the awkward and unhelpful opening phrase 'Create or act on items chapters,' but there is no wasted prose.

Shorter descriptions cost fewer tokens and are easier for agents to parse. Every sentence should earn its place.

Given the tool's complexity, does the description cover enough for an agent to succeed on first attempt?

For a mutation endpoint with an unstructured body and minimal schema information, the description relies almost entirely on external discovery via the GET or /schema endpoint. It does not convey what a valid chapter payload should contain, what the operation actually does, or what prerequisites apply, leaving the agent under-informed.

Complex tools with many parameters or behaviors need more documentation. Simple tools need less. This dimension scales expectations accordingly.

Does the description clarify parameter syntax, constraints, interactions, or defaults beyond what the schema provides?

Schema description coverage is 0%, and the body parameter is an open object with no documented properties. The description compensates minimally by labeling id as a path parameter and directing the agent to inspect the GET or /schema endpoint for body fields, but it offers no concrete field-level guidance.

Input schemas describe structure but not intent. Descriptions should explain non-obvious parameter relationships and valid value ranges.

Does the description clearly state what the tool does and how it differs from similar tools?

The description names the resource ('items chapters') and gives the endpoint, which distinguishes it from sibling tools, but the verb phrase 'Create or act on' is vague and does not clearly state whether this creates, updates, or replaces chapters. It is understandable only in combination with the POST URL.

Agents choose between tools based on descriptions. A clear purpose with a specific verb and resource helps agents select the right tool.

Does the description explain when to use this tool, when not to, or what alternatives exist?

The description provides a prerequisite ('Read the matching GET or the /schema endpoint first') but gives no guidance on when to use this tool versus alternatives like patch_items_by_id_tracks or other create_items_by_id_* endpoints. The intended usage is only implied by the resource name and endpoint.

Agents often have multiple tools that could apply. Explicit usage guidance like "use X instead of Y when Z" prevents misuse.

Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?

Annotations already cover readOnly, destructive, and idempotent hints, so the description is not the only source. It adds the insight that the body fields must be discovered from a matching GET or /schema endpoint, and the POST path implies a mutation. It does not disclose auth requirements, failure modes, or what side effects occur beyond creating/acting on the cover, but no contradiction with the annotations exists.

Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.

Is the description appropriately sized, front-loaded, and free of redundancy?

The definition is concise, front-loaded with the one-line purpose, then the exact endpoint, then parameter notes. Every sentence earns its place; there is no filler or repetition of the input schema.

Shorter descriptions cost fewer tokens and are easier for agents to parse. Every sentence should earn its place.

Given the tool's complexity, does the description cover enough for an agent to succeed on first attempt?

With an output schema and useful annotations, the description does not need to explain return values. However, it leaves the core action ambiguous ('create or act on') and does not say whether the cover payload is JSON, binary, or multipart; the pointer to /schema partially compensates. It is adequate but relies on the agent performing an extra discovery step.

Complex tools with many parameters or behaviors need more documentation. Simple tools need less. This dimension scales expectations accordingly.

Does the description clarify parameter syntax, constraints, interactions, or defaults beyond what the schema provides?

Schema description coverage is 0%, so this dimension needs weight. The description identifies id as a path parameter and body as a request payload, and importantly tells the agent to consult GET or /schema to see the actual fields. It does not describe specific body fields, but for an open additionalProperties object, the lookup instruction is a reasonable substitute.

Input schemas describe structure but not intent. Descriptions should explain non-obvious parameter relationships and valid value ranges.

Does the description clearly state what the tool does and how it differs from similar tools?

The summary names a resource ('items cover') and a POST action, so it is more than a tautology. But 'Create or act on items cover' is vague: it does not say whether this uploads, replaces, or generates cover art, and it does not distinguish itself from patch_items_by_id_cover or delete_items_by_id_cover. The endpoint path adds clarity but does not define the exact operation.

Agents choose between tools based on descriptions. A clear purpose with a specific verb and resource helps agents select the right tool.

Does the description explain when to use this tool, when not to, or what alternatives exist?

No when-to-use guidance is provided. The only instruction, 'Read the matching GET or the /schema endpoint first,' addresses body discovery, not tool selection or exclusion of related siblings. An agent gets no help choosing this over patch_items_by_id_cover or get_items_by_id_cover.

Agents often have multiple tools that could apply. Explicit usage guidance like "use X instead of Y when Z" prevents misuse.

Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?

Annotations already indicate idempotentHint=true and destructiveHint=false, so the description does not need to restate those. However, the description adds no behavioral context beyond the vague 'Create or act': it does not disclose what state changes occur, whether metadata providers are required, or whether existing match data will be replaced. No contradiction with annotations exists.

Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.

Is the description appropriately sized, front-loaded, and free of redundancy?

The description is short and includes the essential endpoint and parameter hints, but the opening sentence 'Create or act on items match' is vague and adds little value. It is not poorly structured overall, but the lead wastes the opportunity to clarify the action.

Shorter descriptions cost fewer tokens and are easier for agents to parse. Every sentence should earn its place.

Given the tool's complexity, does the description cover enough for an agent to succeed on first attempt?

With an output schema present, return values need not be explained, but the description still leaves critical gaps: what 'match' does, when to call it, what prerequisites exist, and how it differs from batch quickmatch. For a mutation-style action on items, this is insufficient context for an agent to confidently invoke it.

Complex tools with many parameters or behaviors need more documentation. Simple tools need less. This dimension scales expectations accordingly.

Does the description clarify parameter syntax, constraints, interactions, or defaults beyond what the schema provides?

Schema description coverage is 0%, so the description must compensate. It identifies id as a path parameter and body as the request payload, and it instructs the agent to consult the matching GET or /schema endpoint for field details. This is genuinely helpful for the body object, but it does not explain what id refers to or what fields body should contain.

Input schemas describe structure but not intent. Descriptions should explain non-obvious parameter relationships and valid value ranges.

Does the description clearly state what the tool does and how it differs from similar tools?

The description says 'Create or act on items match,' which essentially restates the tool name without clarifying what 'match' means as an operation. The endpoint path POST /api/items/{id}/match is precise, but the description does not explain the effect of the match action or distinguish it from similar tools like create_items_batch_quickmatch.

Agents choose between tools based on descriptions. A clear purpose with a specific verb and resource helps agents select the right tool.

Does the description explain when to use this tool, when not to, or what alternatives exist?

The description gives no guidance on when to use this tool versus alternatives such as create_items_batch_quickmatch or create_items_batch_scan. The only usage-related instruction is to read the matching GET or /schema endpoint first, which is a parameter prerequisite rather than a tool-selection guideline.

Agents often have multiple tools that could apply. Explicit usage guidance like "use X instead of Y when Z" prevents misuse.

Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?

Annotations already convey idempotentHint, readOnlyHint, and destructiveHint, and the description adds little behavioral context beyond the endpoint. It does not mention side effects, authentication requirements, or what happens to playback state, so the description adds minimal value over the annotations.

Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.

Is the description appropriately sized, front-loaded, and free of redundancy?

The description is compact and scannable: endpoint, args, and a discovery pointer. The opening phrase 'Create or act on items play' is awkward, but every line serves a purpose and there is no unnecessary filler.

Shorter descriptions cost fewer tokens and are easier for agents to parse. Every sentence should earn its place.

Given the tool's complexity, does the description cover enough for an agent to succeed on first attempt?

The core action is left ambiguous and the description does not place the tool among its many siblings. The GET/schema advice helps with the body, but an agent still lacks a clear understanding of what the play operation does and when to choose it over the episode-specific sibling.

Complex tools with many parameters or behaviors need more documentation. Simple tools need less. This dimension scales expectations accordingly.

Does the description clarify parameter syntax, constraints, interactions, or defaults beyond what the schema provides?

The schema only provides types, so the description usefully clarifies that id is a path parameter and body is the request payload. It also points the agent to the GET or /schema endpoint to discover body fields, which partially compensates for 0% schema description coverage, but actual body fields remain undisclosed.

Input schemas describe structure but not intent. Descriptions should explain non-obvious parameter relationships and valid value ranges.

Does the description clearly state what the tool does and how it differs from similar tools?

The description names the endpoint and HTTP method, so it identifies the resource as items/{id}/play. However, 'Create or act on items play' is vague and does not clearly state that this starts or triggers playback, nor does it distinguish from the sibling play_by_episode_id tool.

Agents choose between tools based on descriptions. A clear purpose with a specific verb and resource helps agents select the right tool.

Does the description explain when to use this tool, when not to, or what alternatives exist?

There is no guidance about when to use this tool versus alternatives. The instruction to read the matching GET or /schema endpoint is a prerequisite for body discovery, not a usage rule. It does not clarify whether this is for whole items only and that episodes should use create_items_by_id_play_by_episode_id.

Agents often have multiple tools that could apply. Explicit usage guidance like "use X instead of Y when Z" prevents misuse.

Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?

Annotations already declare readOnlyHint=false and idempotentHint=true, so the description need not restate those. However, it adds no behavioral context beyond telling the agent to 'Read the matching GET or the /schema endpoint first to see the fields this resource expects.' This hints at needing to inspect external schemas but does not explain what the tool actually does, side effects, or expected outcome. It offers minimal extra value over the annotations.

Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.

Is the description appropriately sized, front-loaded, and free of redundancy?

The description is short but poorly structured and under-specified. The first line is ungrammatical and doesn't add clarity. While it front-loads the HTTP endpoint, the rest is repetitive of the parameter names. It is not concise in a helpful way; it omits essential details while dwelling on trivial labels.

Shorter descriptions cost fewer tokens and are easier for agents to parse. Every sentence should earn its place.

Given the tool's complexity, does the description cover enough for an agent to succeed on first attempt?

Given the tool has a nested body object and no schema descriptions, complete contextual information is essential, but the description is grossly inadequate. It does not explain the purpose of the play action, what the body should contain, or what the response looks like (despite an output schema existing). The agent is left dependent on external endpoints, which may not be accessible in the context. This is far from minimally viable for correct invocation.

Complex tools with many parameters or behaviors need more documentation. Simple tools need less. This dimension scales expectations accordingly.

Does the description clarify parameter syntax, constraints, interactions, or defaults beyond what the schema provides?

Schema description coverage is 0%, so the description must compensate, but it fails. It merely labels id and episode_id as path parameters without explaining what they represent (e.g., item ID, episode ID). The body is described as 'Request payload' with a pointer to external docs, but no hint of required fields or structure is given. This leaves the agent unable to construct a valid request without extra lookups, severely lacking in semantic detail.

Input schemas describe structure but not intent. Descriptions should explain non-obvious parameter relationships and valid value ranges.

Does the description clearly state what the tool does and how it differs from similar tools?

The description states 'Create or act on items play' which is vague and largely restates the tool name. It does include the HTTP endpoint (POST /api/items/{id}/play/{episodeId}), but does not clarify what 'play' means or what action is performed. It fails to distinguish itself from the sibling create_items_by_id_play, making it hard for an agent to know exactly what this variant does.

Agents choose between tools based on descriptions. A clear purpose with a specific verb and resource helps agents select the right tool.

Does the description explain when to use this tool, when not to, or what alternatives exist?

The description provides no guidance on when to use this tool versus alternatives. It does not mention the sibling create_items_by_id_play or any other context. There is no note about prerequisites, typical use cases, or situations where this tool is preferred, leaving the agent without any routing information.

Agents often have multiple tools that could apply. Explicit usage guidance like "use X instead of Y when Z" prevents misuse.

Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?

The description adds minimal behavioral context beyond annotations. It does not state that the operation triggers a scan, whether it requires authentication, or what side effects occur. The only hint is to read the schema endpoint for the body, which implies the body is dynamic but does not explain the operation's behavior. Annotations already indicate idempotency and non-destructiveness, but the description does not enrich that.

Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.

Is the description appropriately sized, front-loaded, and free of redundancy?

The description is concise but structurally sparse. It includes an endpoint and a minimal args list. The opening line 'Create or act on items scan' is vague and does not front-load a clear purpose. The format is acceptable but not well-organized; it could benefit from a clearer separation of purpose and usage.

Shorter descriptions cost fewer tokens and are easier for agents to parse. Every sentence should earn its place.

Given the tool's complexity, does the description cover enough for an agent to succeed on first attempt?

Given the complexity (POST with dynamic body, many sibling tools), the description is incomplete. It does not explain the tool's purpose, the body's expected structure, the response, or when to use it. The pointer to the schema endpoint is a partial workaround, but the description itself is not self-contained, leaving the agent to make assumptions.

Complex tools with many parameters or behaviors need more documentation. Simple tools need less. This dimension scales expectations accordingly.

Does the description clarify parameter syntax, constraints, interactions, or defaults beyond what the schema provides?

The description provides some guidance: it identifies id as a path parameter and body as a payload, and advises reading the GET or /schema endpoint for fields. However, with schema coverage at 0% (body is an open object), this guidance is insufficient to construct a valid request without external lookup. It adds value by pointing to the schema but does not compensate fully for the lack of defined parameters.

Input schemas describe structure but not intent. Descriptions should explain non-obvious parameter relationships and valid value ranges.

Does the description clearly state what the tool does and how it differs from similar tools?

The description 'Create or act on items scan' is ambiguous—it does not clarify what 'scan' means or what action is performed. The endpoint POST /api/items/{id}/scan suggests a scan operation, but the description does not differentiate from sibling tools like create_items_batch_scan or create_libraries_by_id_scan. The verb 'Create' is also unclear—does it create a scan job or act on an existing one? The description repeats the tool name without explaining its function.

Agents choose between tools based on descriptions. A clear purpose with a specific verb and resource helps agents select the right tool.

Does the description explain when to use this tool, when not to, or what alternatives exist?

No guidance is provided on when to use this tool versus alternatives. It does not mention that this scans a single item, while create_items_batch_scan scans multiple items, or any other distinguishing context. The description only gives the endpoint and a pointer to the schema, offering no usage criteria.

Agents often have multiple tools that could apply. Explicit usage guidance like "use X instead of Y when Z" prevents misuse.

Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?

Annotations already provide idempotentHint=true, destructiveHint=false, and readOnlyHint=false, covering the basic side-effect profile. The description adds the HTTP method and a schema-discovery instruction, but does not explain response behavior, error cases, or consequences of repeated calls. This is acceptable given the annotations but adds limited behavioral context beyond them.

Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.

Is the description appropriately sized, front-loaded, and free of redundancy?

The description is compact and front-loaded: the purpose appears first, the endpoint next, and the args section is minimal. Every line earns its place, and there is no redundant prose or filler.

Shorter descriptions cost fewer tokens and are easier for agents to parse. Every sentence should earn its place.

Given the tool's complexity, does the description cover enough for an agent to succeed on first attempt?

Given that an output schema exists and annotations carry the safety profile, the description does not need to explain return values. However, it leaves the actual creation payload entirely undocumented and relies on the agent to query GET/schema at call time. This is workable but not complete on its own, so it barely meets the minimum viable bar.

Complex tools with many parameters or behaviors need more documentation. Simple tools need less. This dimension scales expectations accordingly.

Does the description clarify parameter syntax, constraints, interactions, or defaults beyond what the schema provides?

Schema coverage is 0%: the only parameter, body, is an opaque additionalProperties object with no field descriptions. The description repeats that body is a 'Request payload' and points to GET/schema for field discovery, which is helpful meta-guidance but does not actually describe what the body must contain. Low-coverage schemas require the description to compensate, and this one only defers the work rather than supplying semantics.

Input schemas describe structure but not intent. Descriptions should explain non-obvious parameter relationships and valid value ranges.

Does the description clearly state what the tool does and how it differs from similar tools?

The opening sentence 'Create a new library on server' names a specific action and resource, and the POST /api/libraries line makes the target unambiguous. It is clearly distinguishable from sibling creation tools like create_collections or create_users without needing to open their schemas.

Agents choose between tools based on descriptions. A clear purpose with a specific verb and resource helps agents select the right tool.

Does the description explain when to use this tool, when not to, or what alternatives exist?

The description implies usage: use this when creating a new library. It also gives a preparatory instruction to read the GET or /schema endpoint before constructing the body. However, it does not list alternatives or state when this tool should not be used, so guidance is only implicit rather than explicit.

Agents often have multiple tools that could apply. Explicit usage guidance like "use X instead of Y when Z" prevents misuse.

Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?

The description and endpoint reveal only that metadata is removed; they do not describe effects, reversibility, permissions, or how this interacts with library data. Annotations already cover idempotency and non-destructiveness, so the description adds little behavioral context beyond what is structured.

Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.

Is the description appropriately sized, front-loaded, and free of redundancy?

The description is short and lists Args in a structured way, but the first sentence is garbled ('Create or act on libraries remove-metadata') and the body parameter is left to an external lookup. It is compact but not cleanly written.

Shorter descriptions cost fewer tokens and are easier for agents to parse. Every sentence should earn its place.

Given the tool's complexity, does the description cover enough for an agent to succeed on first attempt?

For a mutating action with an opaque body schema, the description omits the tool's actual effect and selection criteria. It does tell the agent to consult /schema for body fields, but that is not enough to understand what the operation does or when it is appropriate.

Complex tools with many parameters or behaviors need more documentation. Simple tools need less. This dimension scales expectations accordingly.

Does the description clarify parameter syntax, constraints, interactions, or defaults beyond what the schema provides?

With 0% schema description coverage, the description must explain the parameters, but it only labels id as a path parameter and body as a request payload. It points to the GET or /schema endpoint for body fields, which is helpful, but it never says what id refers to or what fields body should contain.

Input schemas describe structure but not intent. Descriptions should explain non-obvious parameter relationships and valid value ranges.

Does the description clearly state what the tool does and how it differs from similar tools?

The description names the resource ('libraries') and the action ('remove-metadata') and gives the exact POST endpoint, so an agent can tell it apart from library scan/update/delete siblings. However, the opening phrase 'Create or act on libraries remove-metadata' is an awkward auto-generated construction rather than a clean statement like 'Removes metadata from a library.'

Agents choose between tools based on descriptions. A clear purpose with a specific verb and resource helps agents select the right tool.

Does the description explain when to use this tool, when not to, or what alternatives exist?

There is no guidance on when to choose this tool over patch_libraries_by_id, delete_libraries_by_id, or other library actions. The instruction to read the GET or /schema endpoint before supplying the body is about preparing the request, not about selecting this tool.

Agents often have multiple tools that could apply. Explicit usage guidance like "use X instead of Y when Z" prevents misuse.

Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?

Annotations state the tool is non-read-only, idempotent, and non-destructive, but the description adds little behavioral context. It does not disclose that acting on a library scan likely triggers background work, what consequences that has for library content, or what the POST response represents. The 'Create or act on' phrasing is too vague to inform the agent of actual behavior.

Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.

Is the description appropriately sized, front-loaded, and free of redundancy?

The description is short and includes the endpoint and argument guidance without excessive padding. However, the first line 'Create or act on libraries scan' is uninformative filler that does not earn its place, weakening the overall structure.

Shorter descriptions cost fewer tokens and are easier for agents to parse. Every sentence should earn its place.

Given the tool's complexity, does the description cover enough for an agent to succeed on first attempt?

With a meaningless purpose statement, no distinction from sibling scan tools, and an open-ended body object, the description is not complete enough for an agent to confidently select and invoke this tool. Having an output schema helps with return values, but the missing operational semantics and selection guidance leave major gaps.

Complex tools with many parameters or behaviors need more documentation. Simple tools need less. This dimension scales expectations accordingly.

Does the description clarify parameter syntax, constraints, interactions, or defaults beyond what the schema provides?

Schema coverage is 0%, so the description must compensate. It does clarify that 'id' is a path parameter and 'body' is the request payload, and it directs the agent to the GET or /schema endpoint for body fields. However, it provides no semantics for what id identifies, what body fields are expected, or what valid values look like, leaving a significant burden on the external schema lookup.

Input schemas describe structure but not intent. Descriptions should explain non-obvious parameter relationships and valid value ranges.

Does the description clearly state what the tool does and how it differs from similar tools?

The description is essentially a tautology: 'Create or act on libraries scan' restates the tool name without explaining what the operation actually does. It does identify the resource (library scan) and the HTTP endpoint, but an agent cannot tell from this that it triggers a scan, what scanning means, or how it differs from create_items_by_id_scan or create_items_batch_scan.

Agents choose between tools based on descriptions. A clear purpose with a specific verb and resource helps agents select the right tool.

Does the description explain when to use this tool, when not to, or what alternatives exist?

There is no guidance about when to use this tool versus sibling scan-related tools, nor any indication of prerequisites or side effects. The only usage hint is to read the matching GET or /schema endpoint before calling, which addresses payload discovery but not tool selection.

Agents often have multiple tools that could apply. Explicit usage guidance like "use X instead of Y when Z" prevents misuse.

Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?

Annotations already indicate this is not read-only, not destructive, and idempotent; the description adds no side-effect details, permissions, or conditions. It does not contradict the annotations, but it reveals nothing about what creating or acting on a libraries order actually changes or requires.

Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.

Is the description appropriately sized, front-loaded, and free of redundancy?

The description is short and mostly front-loaded, but the opening sentence merely restates the tool name and adds little value. The endpoint and body guidance are useful, but the tautological first line keeps this from being tightly effective.

Shorter descriptions cost fewer tokens and are easier for agents to parse. Every sentence should earn its place.

Given the tool's complexity, does the description cover enough for an agent to succeed on first attempt?

For an operation with a generic body, a large sibling set, and no behavioral detail, this description is incomplete. It leaves the meaning of 'libraries order' unexplained and relies on the agent to go elsewhere to understand both the payload and the operation's effect.

Complex tools with many parameters or behaviors need more documentation. Simple tools need less. This dimension scales expectations accordingly.

Does the description clarify parameter syntax, constraints, interactions, or defaults beyond what the schema provides?

The input schema only defines an open-ended body object, and schema description coverage is 0%. The description tells the agent to read the matching GET or /schema endpoint to discover expected fields, which is a helpful pointer, but it does not describe the body semantics or any concrete fields, so it only partially compensates for the schema gap.

Input schemas describe structure but not intent. Descriptions should explain non-obvious parameter relationships and valid value ranges.

Does the description clearly state what the tool does and how it differs from similar tools?

The description only restates the tool name ('Create or act on libraries order') and gives the endpoint path. It never says what an 'order' is, whether it means reordering libraries or creating an order object, or what 'act on' covers. The broad phrasing fails to distinguish this from close siblings like create_libraries or patch_libraries_by_id.

Agents choose between tools based on descriptions. A clear purpose with a specific verb and resource helps agents select the right tool.

Does the description explain when to use this tool, when not to, or what alternatives exist?

The only guidance is to read the matching GET or /schema endpoint first, which is a prerequisite rather than a usage rule. There is no explanation of when to use this tool vs. alternatives, nor any explicit exclusions. An agent is left to infer the appropriate context from the name and endpoint.

Agents often have multiple tools that could apply. Explicit usage guidance like "use X instead of Y when Z" prevents misuse.

Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?

Annotations already declare idempotentHint=true, readOnlyHint=false, and destructiveHint=false, so the safety profile is covered. However, the description adds no behavioral context beyond the vague 'Create or act on' – it does not explain idempotency, side effects, or what happens on repeated calls. The phrase 'act on' introduces ambiguity about whether the tool may mutate or replace existing resources.

Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.

Is the description appropriately sized, front-loaded, and free of redundancy?

The description is concise: two short sentences plus an Args block, with the endpoint front-loaded. It avoids fluff and clearly points to an authoritative schema source. However, the phrase 'Create or act on' is not as crisp as it could be, and the structure could benefit from a more precise action verb.

Shorter descriptions cost fewer tokens and are easier for agents to parse. Every sentence should earn its place.

Given the tool's complexity, does the description cover enough for an agent to succeed on first attempt?

An output schema exists, so return values are covered. The pointer to the GET/schema endpoint is essential for the open 'body' object, but the description does not explain what 'ereader-devices' are, their relationship to the current user, or why one would use this over sibling endpoints. It is minimally sufficient for a knowledgeable agent but lacks domain context.

Complex tools with many parameters or behaviors need more documentation. Simple tools need less. This dimension scales expectations accordingly.

Does the description clarify parameter syntax, constraints, interactions, or defaults beyond what the schema provides?

The schema has no descriptions for the single 'body' parameter (0% coverage), so the description must compensate. It only advises reading the matching GET or /schema endpoint, which is a pointer rather than actual parameter semantics. The agent still has no inline understanding of required fields or data types.

Input schemas describe structure but not intent. Descriptions should explain non-obvious parameter relationships and valid value ranges.

Does the description clearly state what the tool does and how it differs from similar tools?

The description states a specific verb and resource: 'Create or act on me ereader-devices,' matching the endpoint and tool name. However, 'or act on' is ambiguous and could imply update/delete actions, weakening the clarity. It does not explicitly distinguish from sibling ereader-related tools like create_emails_ereader_devices.

Agents choose between tools based on descriptions. A clear purpose with a specific verb and resource helps agents select the right tool.

Does the description explain when to use this tool, when not to, or what alternatives exist?

The description offers no guidance on when to use this tool versus alternatives, nor any exclusions or conditions. The only directive, 'Read the matching GET or the /schema endpoint first,' is a procedural instruction for body construction, not a usage guideline. An agent is left to infer the appropriate context from the name alone.

Agents often have multiple tools that could apply. Explicit usage guidance like "use X instead of Y when Z" prevents misuse.

Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?

Annotations already declare non-read-only, idempotent, and non-destructive behavior, so the description only needs to add extra context. It provides the HTTP method and path, and instructs to read the matching GET or /schema endpoint for body fields, which is useful procedural guidance beyond the annotations. However, it does not describe side effects or what 'act' entails, leaving a gap in behavioral disclosure.

Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.

Is the description appropriately sized, front-loaded, and free of redundancy?

The description is compact and structured, clearly separating the endpoint, args, and a reference to external schema documentation. Every sentence contributes useful information without fluff. The only redundancy is the vague 'or act' but it does not significantly inflate length.

Shorter descriptions cost fewer tokens and are easier for agents to parse. Every sentence should earn its place.

Given the tool's complexity, does the description cover enough for an agent to succeed on first attempt?

For an open-bodied POST with no schema descriptions, the description provides a pointer to external discovery but does not explain the action semantics, id meaning, or how this fits with sibling operations. The presence of an output schema covers return values, but the input side remains underspecified. An agent would likely need additional documentation to correctly invoke this tool.

Complex tools with many parameters or behaviors need more documentation. Simple tools need less. This dimension scales expectations accordingly.

Does the description clarify parameter syntax, constraints, interactions, or defaults beyond what the schema provides?

With schema description coverage at 0%, the description must compensate, but it only labels 'id' as a path parameter and 'body' as a request payload. It does not clarify what the id refers to (item ID is only inferable from the tool name) nor does it explain any body fields, instead deferring to GET/schema endpoints. This is minimal added meaning over the raw schema.

Input schemas describe structure but not intent. Descriptions should explain non-obvious parameter relationships and valid value ranges.

Does the description clearly state what the tool does and how it differs from similar tools?

The description states a verb ('Create') and a resource ('item bookmark'), but adds 'or act' without specifying what other actions are possible, making the scope ambiguous. It does not differentiate from sibling tools like patch_me_item_by_id_bookmark or delete_me_item_by_id_bookmark_by_time, relying on the tool name to carry most of the meaning.

Agents choose between tools based on descriptions. A clear purpose with a specific verb and resource helps agents select the right tool.

Does the description explain when to use this tool, when not to, or what alternatives exist?

The description offers no guidance on when to use this tool versus alternatives. While siblings clearly cover update and delete, there is no mention of them or any conditions that would select this tool over them. The vague 'or act' further muddies the intended usage context.

Agents often have multiple tools that could apply. Explicit usage guidance like "use X instead of Y when Z" prevents misuse.

Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?

Annotations already carry the safety profile (readOnlyHint=false, destructiveHint=false, idempotentHint=true). The description adds only the HTTP method/path and adds no behavioral context such as whether existing settings are replaced, auth requirements, or side effects. Idempotency is implied by the annotation but never explained in practical terms.

Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.

Is the description appropriately sized, front-loaded, and free of redundancy?

Five short sentences, front-loaded with the purpose statement, followed by the endpoint and args guidance. Each line earns its place, though the native Args block is slightly verbose for a single parameter.

Shorter descriptions cost fewer tokens and are easier for agents to parse. Every sentence should earn its place.

Given the tool's complexity, does the description cover enough for an agent to succeed on first attempt?

Output schema and annotations cover return values and safety profile, so the remaining gap is the free-form body, which the /schema pointer addresses. However, the description is vague about what notification settings are, which GET endpoint is 'matching', and how this relates to sibling notification tools – adequate but with clear gaps.

Complex tools with many parameters or behaviors need more documentation. Simple tools need less. This dimension scales expectations accordingly.

Does the description clarify parameter syntax, constraints, interactions, or defaults beyond what the schema provides?

Schema description coverage is 0% and the body parameter is an unconstrained object (additionalProperties: true), so the description must compensate. It does so by directing the agent to read the matching GET or /schema endpoint to discover expected fields – genuinely useful guidance for an open-world body – though it names no actual fields itself.

Input schemas describe structure but not intent. Descriptions should explain non-obvious parameter relationships and valid value ranges.

Does the description clearly state what the tool does and how it differs from similar tools?

"Create notification settings" states a specific verb plus resource, and gives the POST /api/notifications endpoint. It is implicitly distinguishable from siblings like list_notifications, patch_notifications, and delete_notifications_by_id by the create verb, but it does not explicitly name or contrast any sibling.

Agents choose between tools based on descriptions. A clear purpose with a specific verb and resource helps agents select the right tool.

Does the description explain when to use this tool, when not to, or what alternatives exist?

No guidance on when to use this tool versus alternatives such as patch_notifications or delete_notifications_by_id. The only usage hint is operational – read the GET or /schema endpoint first – which addresses prerequisites, not tool selection, and gives no when-to-use or when-not-to-use guidance.

Agents often have multiple tools that could apply. Explicit usage guidance like "use X instead of Y when Z" prevents misuse.

Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?

The annotations already declare readOnlyHint=false, idempotentHint=true, and destructiveHint=false, so the safety profile is covered. The description adds the HTTP endpoint context (POST create), which is consistent with those annotations, but discloses nothing further such as auth needs, side effects, or error behavior. With annotations present the bar is lower, so a 3 is appropriate.

Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.

Is the description appropriately sized, front-loaded, and free of redundancy?

Three short, front-loaded lines: purpose, endpoint, and the arrow note about the body. Each sentence earns its place and there is no filler; the ambiguous 'or act on' phrase is the only mild waste.

Shorter descriptions cost fewer tokens and are easier for agents to parse. Every sentence should earn its place.

Given the tool's complexity, does the description cover enough for an agent to succeed on first attempt?

For a create tool with a fully open body, pointing to the GET/schema endpoint is the right compensation, and the presence of an output schema means return values need not be documented. However, the description never clarifies what 'act on' means, how this differs from the playlist sibling tools, or what a successful create returns — adequate but thin for such an open-ended tool.

Complex tools with many parameters or behaviors need more documentation. Simple tools need less. This dimension scales expectations accordingly.

Does the description clarify parameter syntax, constraints, interactions, or defaults beyond what the schema provides?

Schema coverage is 0% and the sole 'body' parameter is an open object (additionalProperties: true), so the description must compensate. It labels body as 'Request payload' and directs the agent to the GET or /schema endpoint for the expected fields — a genuinely useful pointer — but it does not describe any actual fields or shape, leaving the body semantics to be discovered elsewhere.

Input schemas describe structure but not intent. Descriptions should explain non-obvious parameter relationships and valid value ranges.

Does the description clearly state what the tool does and how it differs from similar tools?

The description anchors on a specific resource and HTTP verb ('POST /api/playlists'), so it is not a tautology. However, 'Create or act on api playlists' is vague about what 'act on' covers, and with siblings like create_playlists_by_id_item, create_playlists_by_id_batch_add, and create_playlists_collection_by_collection_id, an agent cannot tell from the description that this is the base playlist-creation operation.

Agents choose between tools based on descriptions. A clear purpose with a specific verb and resource helps agents select the right tool.

Does the description explain when to use this tool, when not to, or what alternatives exist?

The only guidance is a prerequisite — 'Read the matching GET or the /schema endpoint first' — which helps prepare the request payload but says nothing about when to choose this tool over closely related siblings (create_playlists_by_id_item, patch_playlists_by_id, create_playlists_collection_by_collection_id). No when/when-not/alternatives are given.

Agents often have multiple tools that could apply. Explicit usage guidance like "use X instead of Y when Z" prevents misuse.

Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?

Annotations already indicate a non-read-only, idempotent, non-destructive operation. The description adds no behavioral context beyond that; it doesn't describe side effects, required permissions, or what happens on call. It only gives a generic instruction to read the schema. No contradiction with annotations.

Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.

Is the description appropriately sized, front-loaded, and free of redundancy?

The description is short, but the opening sentence 'Create or act on batch add' is vague and not useful. It doesn't front-load the essential information. The two-line structure plus a parameter list is minimal but not effective because it omits crucial meaning. It's under-specified rather than concise.

Shorter descriptions cost fewer tokens and are easier for agents to parse. Every sentence should earn its place.

Given the tool's complexity, does the description cover enough for an agent to succeed on first attempt?

Given a batch-add operation with an output schema, the description should still explain what the tool does, what the id refers to, and what the body expects. It only points to the GET/schema endpoint. This is incomplete for an agent to call it correctly without external lookups. No mention of the resource type (playlist) or the batch semantics.

Complex tools with many parameters or behaviors need more documentation. Simple tools need less. This dimension scales expectations accordingly.

Does the description clarify parameter syntax, constraints, interactions, or defaults beyond what the schema provides?

Schema description coverage is 0%, so the description must explain the parameters. It only states that id is a path parameter and body is a request payload, which merely restates the schema types. It does not explain that id is the playlist ID or what fields the body should contain beyond 'read the endpoint.' The pointer to GET/schema is a workaround, not semantic description.

Input schemas describe structure but not intent. Descriptions should explain non-obvious parameter relationships and valid value ranges.

Does the description clearly state what the tool does and how it differs from similar tools?

The description says 'Create or act on batch add' which is vague and doesn't identify the resource (playlist) or the specific action (adding items). The URL path is given but not decoded. It doesn't distinguish from sibling tools like create_playlists_by_id_batch_remove or create_playlists_by_id_item.

Agents choose between tools based on descriptions. A clear purpose with a specific verb and resource helps agents select the right tool.

Does the description explain when to use this tool, when not to, or what alternatives exist?

No guidance on when to use this tool versus alternatives. It doesn't mention that this is for batch adding items to a playlist or compare with single-item addition or removal. The only instruction is to read the GET/schema endpoint, which is about parameter format, not usage context.

Agents often have multiple tools that could apply. Explicit usage guidance like "use X instead of Y when Z" prevents misuse.

Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?

Annotations indicate idempotentHint=true and destructiveHint=false, but the description does not explain the behavioral implications. The description says 'Create or act on batch remove' which is confusing—'Create' suggests a write operation, but the tool is a batch remove. It does not disclose what happens to the playlist, whether items are deleted or just removed from the playlist, or any side effects. The description adds no behavioral context beyond the annotations.

Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.

Is the description appropriately sized, front-loaded, and free of redundancy?

The description is short and includes the HTTP path and a pointer to the schema endpoint, which is useful. However, the opening phrase 'Create or act on batch remove' is awkward and unhelpful, and the description could be more concise and clear. It is not well-structured for an agent to quickly understand the tool's purpose.

Shorter descriptions cost fewer tokens and are easier for agents to parse. Every sentence should earn its place.

Given the tool's complexity, does the description cover enough for an agent to succeed on first attempt?

Given the tool's complexity (batch operation on playlists) and the lack of output schema details, the description is incomplete. It does not explain the request body structure, the expected response, or any prerequisites. The pointer to the GET or /schema endpoint is helpful but shifts the burden to the agent to discover essential information. The description is not sufficient for an agent to invoke the tool correctly without additional lookups.

Complex tools with many parameters or behaviors need more documentation. Simple tools need less. This dimension scales expectations accordingly.

Does the description clarify parameter syntax, constraints, interactions, or defaults beyond what the schema provides?

Schema description coverage is 0%, so the description must compensate for the lack of parameter documentation. It only mentions 'id: Path parameter' and 'body: Request payload' with a pointer to the GET or /schema endpoint. This is minimal and does not explain what the body should contain (e.g., list of item IDs to remove). The description fails to provide meaningful parameter semantics.

Input schemas describe structure but not intent. Descriptions should explain non-obvious parameter relationships and valid value ranges.

Does the description clearly state what the tool does and how it differs from similar tools?

The description 'Create or act on batch remove' is vague and tautological, essentially restating the tool name. It does not clearly state what 'batch remove' does in the context of playlists (e.g., removing multiple items from a playlist). The HTTP path is provided but adds no semantic clarity about the operation's effect.

Agents choose between tools based on descriptions. A clear purpose with a specific verb and resource helps agents select the right tool.

Does the description explain when to use this tool, when not to, or what alternatives exist?

No guidance is given on when to use this tool versus alternatives. The sibling list includes create_playlists_by_id_batch_add and delete_playlists_by_id_item_by_library_item_id_by_episode_id, which are related operations, but the description does not differentiate this tool from them or explain when batch remove is appropriate.

Agents often have multiple tools that could apply. Explicit usage guidance like "use X instead of Y when Z" prevents misuse.

Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?

Annotations indicate a mutating, idempotent, non-destructive operation; the description's 'create or act' aligns with readOnlyHint=false. However, it adds no behavioral context beyond pointing to GET/schema for field expectations, leaving side effects and success criteria undisclosed.

Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.

Is the description appropriately sized, front-loaded, and free of redundancy?

The description is brief and to the point, with no fluff, but it is so sparse that it sacrifices usefulness. It's concise in length but not sufficiently informative, earning an average score.

Shorter descriptions cost fewer tokens and are easier for agents to parse. Every sentence should earn its place.

Given the tool's complexity, does the description cover enough for an agent to succeed on first attempt?

Given an open-ended body object with nested structures, the description does not provide enough information to call the tool correctly. It delegates to GET/schema but gives no example or expected response, and its ambiguous purpose leaves a gap that might cause an agent to make incorrect assumptions.

Complex tools with many parameters or behaviors need more documentation. Simple tools need less. This dimension scales expectations accordingly.

Does the description clarify parameter syntax, constraints, interactions, or defaults beyond what the schema provides?

With 0% schema description coverage, the description only says id is a path parameter and body is a request payload that should be read from GET/schema. It gives a pointer but doesn't explain the body structure or allowed fields, so it only partially compensates for the missing schema documentation.

Input schemas describe structure but not intent. Descriptions should explain non-obvious parameter relationships and valid value ranges.

Does the description clearly state what the tool does and how it differs from similar tools?

The description names the endpoint and resource ('playlists item') and states it 'creates or acts' on it, but the verb 'act' is ambiguous and doesn't specify what specific action (add/update/delete) it performs, nor does it distinguish from sibling batch operations like create_playlists_by_id_batch_add or batch_remove.

Agents choose between tools based on descriptions. A clear purpose with a specific verb and resource helps agents select the right tool.

Does the description explain when to use this tool, when not to, or what alternatives exist?

There is no mention of when to use this tool versus alternatives, no exclusions, and no context that would help an agent decide between this and the many sibling playlist operations. The description offers zero routing guidance.

Agents often have multiple tools that could apply. Explicit usage guidance like "use X instead of Y when Z" prevents misuse.

Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?

Annotations already indicate readOnlyHint=false and idempotentHint=true, so the agent knows it is a write and idempotent. The description adds no behavioral context—no side effects, auth requirements, or what 'act on' means. It does not contradict annotations, but contributes nothing beyond them.

Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.

Is the description appropriately sized, front-loaded, and free of redundancy?

The description is short and includes the endpoint and argument list, which is efficient. However, the phrase 'Create or act on' is imprecise, and the structure prioritizes the HTTP method over clarifying the action. It is concise but at the expense of clarity.

Shorter descriptions cost fewer tokens and are easier for agents to parse. Every sentence should earn its place.

Given the tool's complexity, does the description cover enough for an agent to succeed on first attempt?

For a tool with a generic body parameter and no field documentation, the description is incomplete. It doesn't explain what the collection is, what 'act on' entails, or what the response will be. The pointer to schema/GET is helpful only if the agent can reach those, and it is not sufficient to make the tool usable standalone.

Complex tools with many parameters or behaviors need more documentation. Simple tools need less. This dimension scales expectations accordingly.

Does the description clarify parameter syntax, constraints, interactions, or defaults beyond what the schema provides?

Schema coverage is 0%, so the description must explain parameters, but it only labels collection_id as 'Path parameter' and body as 'Request payload' without explaining semantics. The directive to read GET/schema is a workaround, not meaningful parameter description. Body is a generic object with no documented fields, leaving the agent uncertain about what to send.

Input schemas describe structure but not intent. Descriptions should explain non-obvious parameter relationships and valid value ranges.

Does the description clearly state what the tool does and how it differs from similar tools?

The description says 'Create or act on playlists collection,' which is vague. It provides an endpoint but does not specify what action is performed (create collection? add to collection? etc.). It is not a tautology but lacks a specific verb and resource scope, and does not differentiate from sibling tools like create_playlists or create_playlists_by_id_batch_add.

Agents choose between tools based on descriptions. A clear purpose with a specific verb and resource helps agents select the right tool.

Does the description explain when to use this tool, when not to, or what alternatives exist?

No guidance is given on when to use this tool versus alternatives. The only hint is to read the matching GET or schema endpoint for field info, which is about payload structure, not selection. No exclusions or context for choosing this tool are provided.

Agents often have multiple tools that could apply. Explicit usage guidance like "use X instead of Y when Z" prevents misuse.

Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?

Annotations already cover the basic safety profile (readOnlyHint=false, destructiveHint=false, idempotentHint=true), and the description does not contradict them. It adds that this is a POST endpoint and that body fields should be discovered via GET or /schema, but it does not describe side effects, authentication, or response behavior. Given annotation coverage, this is acceptable but not rich.

Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.

Is the description appropriately sized, front-loaded, and free of redundancy?

The description is compact and front-loaded: action, endpoint, then parameter guidance. Each sentence earns its place, and the /schema pointer is a practical addition without unnecessary elaboration.

Shorter descriptions cost fewer tokens and are easier for agents to parse. Every sentence should earn its place.

Given the tool's complexity, does the description cover enough for an agent to succeed on first attempt?

For a simple create tool with one generic body parameter and an output schema present, the description is largely complete: it provides the endpoint, the parameter, and a discovery mechanism for body fields. It does not mention auth or alternatives, but those are less critical given the annotations and the explicit schema-discovery instruction.

Complex tools with many parameters or behaviors need more documentation. Simple tools need less. This dimension scales expectations accordingly.

Does the description clarify parameter syntax, constraints, interactions, or defaults beyond what the schema provides?

Schema coverage is 0% and the only parameter is an opaque body object with additionalProperties: true. The description adds meaningful value by labeling body as the request payload and instructing the agent to consult the matching GET or /schema endpoint for expected fields, which compensates for the empty schema.

Input schemas describe structure but not intent. Descriptions should explain non-obvious parameter relationships and valid value ranges.

Does the description clearly state what the tool does and how it differs from similar tools?

The opening sentence 'Create a new podcast.' clearly states the action and resource. It is distinguishable from generic create_* tools, but it does not explicitly differentiate from related podcast siblings such as create_podcasts_feed or create_podcasts_opml_create.

Agents choose between tools based on descriptions. A clear purpose with a specific verb and resource helps agents select the right tool.

Does the description explain when to use this tool, when not to, or what alternatives exist?

No guidance is given about when to use this tool versus alternatives. The only directional advice is to read the matching GET or /schema endpoint for body fields, which is about parameter discovery, not tool selection. Usage is implied but not stated.

Agents often have multiple tools that could apply. Explicit usage guidance like "use X instead of Y when Z" prevents misuse.

Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?

Annotations already indicate readOnlyHint=false, idempotentHint=true, and destructiveHint=false, so the base safety profile is covered. The description adds that this is a POST request with a request payload and tells the agent to inspect the schema for body fields, but it does not disclose side effects, auth requirements, or what launching a download entails.

Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.

Is the description appropriately sized, front-loaded, and free of redundancy?

The description is compact and front-loaded with the core action, then the endpoint, then the two arguments. There is no filler or redundant restatement, and the schema-instruction sentence earns its place because the body is otherwise undocumented.

Shorter descriptions cost fewer tokens and are easier for agents to parse. Every sentence should earn its place.

Given the tool's complexity, does the description cover enough for an agent to succeed on first attempt?

For a POST operation with an opaque body, the description gives an actionable way to discover the request shape ('read the matching GET or /schema endpoint'), and an output schema is present so return-value detail is not required. It is slightly incomplete in not describing the actual effect of downloading episodes, but the endpoint and annotations provide enough context for correct invocation.

Complex tools with many parameters or behaviors need more documentation. Simple tools need less. This dimension scales expectations accordingly.

Does the description clarify parameter syntax, constraints, interactions, or defaults beyond what the schema provides?

The input schema is minimal: id is an untyped string and body is an opaque object with additionalProperties. The description adds meaning by identifying id as a path parameter and body as the request payload, and it compensates for the empty body schema by directing the agent to read the matching GET or /schema endpoint to learn expected fields.

Input schemas describe structure but not intent. Descriptions should explain non-obvious parameter relationships and valid value ranges.

Does the description clearly state what the tool does and how it differs from similar tools?

The description opens with 'Download podcast episodes,' a clear verb plus resource, and includes the full POST endpoint, so an agent can understand the action. It does not explicitly contrast with sibling tools like get_podcasts_by_id_downloads or create_podcasts_by_id_match_episodes, but the endpoint and action phrase are specific enough to disambiguate.

Agents choose between tools based on descriptions. A clear purpose with a specific verb and resource helps agents select the right tool.

Does the description explain when to use this tool, when not to, or what alternatives exist?

No guidance is given about when to use this tool versus alternatives such as get_podcasts_by_id_downloads, get_podcasts_by_id_episode_by_episode_id, or create_podcasts_by_id_match_episodes. The only procedural note—'Read the matching GET or the /schema endpoint first'—addresses how to discover request fields, not when to choose this operation.

Agents often have multiple tools that could apply. Explicit usage guidance like "use X instead of Y when Z" prevents misuse.

Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?

Annotations already cover idempotency, read-only, and destructive hints, so the description doesn't need to restate them. The description adds the 'override' behavior (override existing details if set to 1), which is a meaningful behavioral disclosure. It also characterizes the operation as 'quick match,' but this is vague. Overall, it adds some value beyond annotations but lacks richer details like side effects or authorization requirements.

Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.

Is the description appropriately sized, front-loaded, and free of redundancy?

The description is exceptionally concise: a one-line summary, the HTTP endpoint, and three clearly labeled arguments. It front-loads the core purpose and avoids any fluff or repetition. Every sentence earns its place, making it easy to scan.

Shorter descriptions cost fewer tokens and are easier for agents to parse. Every sentence should earn its place.

Given the tool's complexity, does the description cover enough for an agent to succeed on first attempt?

For a tool with a simple parameter set and an output schema, the description is mostly sufficient, but the body parameter is a significant gap. The agent is told to 'read the matching GET or the /schema endpoint first' without specifying which GET or what fields to expect. This is an external dependency that may not be accessible to the agent. Annotations provide safety context, but the ambiguity around the payload prevents full completeness.

Complex tools with many parameters or behaviors need more documentation. Simple tools need less. This dimension scales expectations accordingly.

Does the description clarify parameter syntax, constraints, interactions, or defaults beyond what the schema provides?

Schema description coverage is 0%, so the description is the sole explanatory source. It does provide semantics for each parameter: id as a path parameter, body as a payload with a pointer to the matching GET or /schema endpoint, and override as 'override existing details if set to 1.' This adds meaning beyond the bare schema, but the body description is not self-contained—it defers to external endpoints rather than summarizing expected fields.

Input schemas describe structure but not intent. Descriptions should explain non-obvious parameter relationships and valid value ranges.

Does the description clearly state what the tool does and how it differs from similar tools?

The description states a specific action ('match') and resource ('podcast episodes'), which clearly differentiates it from siblings like create_items_by_id_match (which targets items). However, 'Quick match' is somewhat vague—it doesn't explain what matching entails or whether it creates associations or metadata. Still, the verb+resource is identifiable and distinguishes from most siblings.

Agents choose between tools based on descriptions. A clear purpose with a specific verb and resource helps agents select the right tool.

Does the description explain when to use this tool, when not to, or what alternatives exist?

No guidance is given on when to use this tool versus alternatives. There is no mention of conditions, exclusions, or comparisons to related tools like create_items_by_id_match or get_podcasts_by_id_search_episode. The only contextual hint is to read the matching GET or /schema endpoint for body fields, which is about parameter usage, not tool selection.

Agents often have multiple tools that could apply. Explicit usage guidance like "use X instead of Y when Z" prevents misuse.

Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?

Annotation Contradiction: The description says 'Get podcast feed,' implying a read-only operation, while annotations declare readOnlyHint=false, indicating the tool may modify state. The tool name and POST method also suggest creation. The description adds no side-effect context and is inconsistent with the annotations.

Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.

Is the description appropriately sized, front-loaded, and free of redundancy?

The description is compact and front-loaded with the core purpose, includes the endpoint and an args section. The structure is easy to scan, though the 'Get' versus POST/create mismatch creates avoidable confusion.

Shorter descriptions cost fewer tokens and are easier for agents to parse. Every sentence should earn its place.

Given the tool's complexity, does the description cover enough for an agent to succeed on first attempt?

For a POST/create tool with an arbitrary body and many sibling tools, the description omits when to use it, what the request body should contain, any behavioral side effects, and how it relates to other feed/podcast endpoints. Pointing to /schema helps but is not enough to make the tool fully callable.

Complex tools with many parameters or behaviors need more documentation. Simple tools need less. This dimension scales expectations accordingly.

Does the description clarify parameter syntax, constraints, interactions, or defaults beyond what the schema provides?

Schema description coverage is 0%, and the sole 'body' parameter is an open object with additionalProperties. The description labels it as 'Request payload' and tells the agent to inspect the matching GET or /schema endpoint for expected fields, but it does not provide direct semantics for the body contents, leaving the parameter largely opaque.

Input schemas describe structure but not intent. Descriptions should explain non-obvious parameter relationships and valid value ranges.

Does the description clearly state what the tool does and how it differs from similar tools?

The description states a resource (podcast feed) and a verb ('Get'), but that verb conflicts with the tool name 'create_podcasts_feed' and the documented POST method. It does not distinguish this tool from the many feed-related or podcast-related siblings, and the operation it actually performs is unclear.

Agents choose between tools based on descriptions. A clear purpose with a specific verb and resource helps agents select the right tool.

Does the description explain when to use this tool, when not to, or what alternatives exist?

There is no guidance about when to use this tool versus alternatives such as create_podcasts or other feed endpoints. The only instruction is to read the matching GET or /schema endpoint first, which is preparation for the payload, not usage selection guidance.

Agents often have multiple tools that could apply. Explicit usage guidance like "use X instead of Y when Z" prevents misuse.

Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?

Annotations already establish readOnly=false, idempotent=true, destructive=false, so the safety profile is covered. The description adds the 'bulk' behavior and OPML feed URLs as the input source, but doesn't explain side effects, response behavior, or auth needs.

Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.

Is the description appropriately sized, front-loaded, and free of redundancy?

The text is short and front-loaded with the operation, followed by endpoint and parameter sections. The 'Args' boilerplate is minimal and does not significantly hurt clarity.

Shorter descriptions cost fewer tokens and are easier for agents to parse. Every sentence should earn its place.

Given the tool's complexity, does the description cover enough for an agent to succeed on first attempt?

With an output schema present and annotations available, the description doesn't need to cover return values, but the body shape is left completely open. Pointing to the /schema endpoint helps an agent recover, though it doesn't make the definition self-contained.

Complex tools with many parameters or behaviors need more documentation. Simple tools need less. This dimension scales expectations accordingly.

Does the description clarify parameter syntax, constraints, interactions, or defaults beyond what the schema provides?

The schema exposes a single opaque body object with additionalProperties:true and 0% field coverage, so the description needed to compensate. It only labels the parameter as 'request payload' and defers to the GET/schema endpoint, without naming or describing the expected OPML-feed-URL fields.

Input schemas describe structure but not intent. Descriptions should explain non-obvious parameter relationships and valid value ranges.

Does the description clearly state what the tool does and how it differs from similar tools?

The opening sentence names a specific verb ('bulk create'), resource ('podcasts'), and input source ('OPML feed URLs'), so the operation is clear. It does not explicitly differentiate from nearby siblings like create_podcasts, create_podcasts_feed, or create_podcasts_opml_parse, so it falls just short of full sibling distinction.

Agents choose between tools based on descriptions. A clear purpose with a specific verb and resource helps agents select the right tool.

Does the description explain when to use this tool, when not to, or what alternatives exist?

No guidance is given about when to choose this tool over create_podcasts, create_podcasts_feed, or create_podcasts_opml_parse. The description only states what the endpoint does, with no preconditions, exclusions, or alternative routing.

Agents often have multiple tools that could apply. Explicit usage guidance like "use X instead of Y when Z" prevents misuse.

Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?

Annotations already indicate the operation is idempotent and non-destructive, lowering the burden on the description. The description adds the HTTP method and resource path, but it does not clarify whether parsed feeds are only returned or also persisted, and it omits permission/auth context. No contradiction with annotations.

Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.

Is the description appropriately sized, front-loaded, and free of redundancy?

The description is short, front-loads the core purpose, and has no redundant filler. Each line earns its place, though more behavioral detail could be added without hurting conciseness.

Shorter descriptions cost fewer tokens and are easier for agents to parse. Every sentence should earn its place.

Given the tool's complexity, does the description cover enough for an agent to succeed on first attempt?

With an output schema and idempotent/non-destructive annotations present, the definition does not need to explain return values or safety. However, it leaves the body shape to be discovered externally and gives no usage context or side-effect clarification, so it is minimally viable rather than fully self-contained.

Complex tools with many parameters or behaviors need more documentation. Simple tools need less. This dimension scales expectations accordingly.

Does the description clarify parameter syntax, constraints, interactions, or defaults beyond what the schema provides?

Schema description coverage is 0% and the body is an opaque additionalProperties object, so the description must compensate. Saying 'body: Request payload' plus directing the agent to read the /schema endpoint is a useful discovery cue, but it supplies no actual field semantics.

Input schemas describe structure but not intent. Descriptions should explain non-obvious parameter relationships and valid value ranges.

Does the description clearly state what the tool does and how it differs from similar tools?

The description opens with 'Get feeds from OPML text', which clearly states the action and input resource. It conveys that this tool parses OPML text into feeds, though it does not explicitly name or contrast the sibling create_podcasts_opml_create.

Agents choose between tools based on descriptions. A clear purpose with a specific verb and resource helps agents select the right tool.

Does the description explain when to use this tool, when not to, or what alternatives exist?

There is no explicit statement about when to use this tool versus alternatives, nor any exclusions or prerequisites. The only guidance is to read the matching GET or /schema endpoint, which is about parameter discovery, not usage context.

Agents often have multiple tools that could apply. Explicit usage guidance like "use X instead of Y when Z" prevents misuse.

Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?

Annotations indicate idempotentHint=true, so the description doesn't need to state idempotency. But the description omits behavioral details like whether closing a session is irreversible, what side effects occur (e.g., invalidating tokens), or whether it requires authentication. It also refers to the 'body' payload but doesn't explain what happens with it beyond 'act on session close'. Without annotations for destruction, the description carries the burden and falls short on depth.

Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.

Is the description appropriately sized, front-loaded, and free of redundancy?

The description is extremely short, using four lines. It front-loads the purpose and endpoint, then gives a brief instruction for the body. There is no fluff, but it could have provided more substance without being verbose. The brevity is acceptable, but the lack of detail makes it less useful.

Shorter descriptions cost fewer tokens and are easier for agents to parse. Every sentence should earn its place.

Given the tool's complexity, does the description cover enough for an agent to succeed on first attempt?

Given that the body is an open object with no schema and the description defers to other endpoints, the tool lacks complete information for an agent to construct a valid request. The presence of an output schema helps, but the body's semantics are undefined. For a tool that's about closing a session, the agent needs to know what fields the body might acceptchers, which is not provided. This is a significant gap.

Complex tools with many parameters or behaviors need more documentation. Simple tools need less. This dimension scales expectations accordingly.

Does the description clarify parameter syntax, constraints, interactions, or defaults beyond what the schema provides?

Schema coverage is 0% and there are only 2 parameters: id and body. The description mentions 'id' as a path parameter and 'body' as a request payload, but the body is an open object with no documented fields, and it explicitly defers to the GET or /schema endpoint. This does little to clarify parameter semantics beyond what the schema already shows; the description should have explained more about the body's expected structure.

Input schemas describe structure but not intent. Descriptions should explain non-obvious parameter relationships and valid value ranges.

Does the description clearly state what the tool does and how it differs from similar tools?

The description states the verb and resource: 'Create or act on session close' with the endpoint '/api/session/{id}/close', which clearly indicates closing a session. It distinguishes somewhat from siblings like create_session_by_id_sync, though not explicitly. The phrase 'or act on' is slightly vague, but the endpoint clarifies.

Agents choose between tools based on descriptions. A clear purpose with a specific verb and resource helps agents select the right tool.

Does the description explain when to use this tool, when not to, or what alternatives exist?

The description does not provide explicit guidance on when to use this tool versus alternatives. It only says to read the matching GET or /schema endpoint to understand the body fields, which implies a need for discovery but not a clear context for when closing a session is appropriate. No exclusions or alternatives are mentioned.

Agents often have multiple tools that could apply. Explicit usage guidance like "use X instead of Y when Z" prevents misuse.

Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?

Aside from repeating the POST endpoint, the description reveals no behavior: no mention of what synchronizing does, what state changes occur, or any side effects. Annotations (idempotentHint, readOnly false) carry the safety profile, but the description adds no behavioral context of its own.

Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.

Is the description appropriately sized, front-loaded, and free of redundancy?

The description is compact and well organized with endpoint and args. The body-discovery pointer is a useful sentence, though 'Create or act on' is vague and could be replaced with concrete behavior.

Shorter descriptions cost fewer tokens and are easier for agents to parse. Every sentence should earn its place.

Given the tool's complexity, does the description cover enough for an agent to succeed on first attempt?

For a tool whose semantics are opaque and whose body is unconstrained by the schema, the description is too thin: it omits the purpose/effect of sync and the conditions under which it should be invoked. While an output schema exists, that does not clarify when or why to call this tool.

Complex tools with many parameters or behaviors need more documentation. Simple tools need less. This dimension scales expectations accordingly.

Does the description clarify parameter syntax, constraints, interactions, or defaults beyond what the schema provides?

It correctly identifies id as a path parameter and body as the request payload, and it adds a useful pointer: read the matching GET or /schema endpoint to discover body fields. However, it does not explain what id refers to or what sync actions the body can express, so the 0% schema coverage is only partially compensated.

Input schemas describe structure but not intent. Descriptions should explain non-obvious parameter relationships and valid value ranges.

Does the description clearly state what the tool does and how it differs from similar tools?

The description repeats the name ('Create or act on session sync') and gives an endpoint, but never states what the operation actually does—whether it creates a session, synchronizes data, or updates state. It lacks a specific verb+resource and does not distinguish itself from get_session_by_id or delete_sessions_by_id.

Agents choose between tools based on descriptions. A clear purpose with a specific verb and resource helps agents select the right tool.

Does the description explain when to use this tool, when not to, or what alternatives exist?

No statement about when to use this tool versus the many session tools (get_session_by_id, delete_session_by_id, create_session_local). The only guidance is to read the GET or /schema endpoint before calling, which is a preparation step, not a selection rule.

Agents often have multiple tools that could apply. Explicit usage guidance like "use X instead of Y when Z" prevents misuse.

Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?

Annotations already supply idempotentHint=true, readOnlyHint=false, and destructiveHint=false, and the description does not contradict them. It adds the HTTP method and 'create or act' framing, but gives no detail on side effects, authentication, or what 'acting' changes.

Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.

Is the description appropriately sized, front-loaded, and free of redundancy?

The description is short and front-loaded with the purpose, followed by the endpoint and argument guidance. The vague 'Create or act' wording costs a point, but there is no filler.

Shorter descriptions cost fewer tokens and are easier for agents to parse. Every sentence should earn its place.

Given the tool's complexity, does the description cover enough for an agent to succeed on first attempt?

The pointer to GET/schema is useful for an opaque body, and an output schema exists, but the description never explains what a 'session local' is, what 'act' covers, or how this differs from create_session_local_all. An agent could invoke it but may not know the intended scenario.

Complex tools with many parameters or behaviors need more documentation. Simple tools need less. This dimension scales expectations accordingly.

Does the description clarify parameter syntax, constraints, interactions, or defaults beyond what the schema provides?

The schema exposes a single opaque body with additionalProperties true and no property descriptions, so schema coverage is 0%. The description partially compensates by identifying body as the request payload and instructing the agent to consult the matching GET or /schema endpoint, but it supplies no actual field semantics.

Input schemas describe structure but not intent. Descriptions should explain non-obvious parameter relationships and valid value ranges.

Does the description clearly state what the tool does and how it differs from similar tools?

The phrase 'Create or act on session local' names a resource but uses the vague compound verb 'create or act', so an agent cannot tell precisely what operation is performed. It does not differentiate from the sibling create_session_local_all or the session close/sync tools, and the endpoint line mostly restates the tool name.

Agents choose between tools based on descriptions. A clear purpose with a specific verb and resource helps agents select the right tool.

Does the description explain when to use this tool, when not to, or what alternatives exist?

The only usage guidance is to read the matching GET or /schema endpoint before calling. There is no statement of when to prefer this tool over related session siblings, no exclusions, and no scenario context.

Agents often have multiple tools that could apply. Explicit usage guidance like "use X instead of Y when Z" prevents misuse.

Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?

The description adds no behavioral detail beyond the annotations. It does not explain what creating or acting on a local-all session entails, what side effects may occur, or why idempotentHint is true, so the description carries little disclosure burden and fails to add context.

Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.

Is the description appropriately sized, front-loaded, and free of redundancy?

The description is compact and front-loads the core action and endpoint. The brief 'Args' block is useful and avoids unnecessary prose, though the vague 'act on' language prevents a top score.

Shorter descriptions cost fewer tokens and are easier for agents to parse. Every sentence should earn its place.

Given the tool's complexity, does the description cover enough for an agent to succeed on first attempt?

Given the generic body schema, the absence of an output schema description, and a sibling tool with a near-identical name, the description leaves significant ambiguity about what this endpoint is for and what a successful call produces. The pointer to GET/schema helps but does not complete the picture.

Complex tools with many parameters or behaviors need more documentation. Simple tools need less. This dimension scales expectations accordingly.

Does the description clarify parameter syntax, constraints, interactions, or defaults beyond what the schema provides?

For a single 'body' parameter with schema coverage of 0%, the description usefully identifies it as the request payload and instructs the agent to consult the matching GET or /schema endpoint for the expected fields. This compensates for the opaque additionalProperties: true schema, though it does not enumerate concrete fields.

Input schemas describe structure but not intent. Descriptions should explain non-obvious parameter relationships and valid value ranges.

Does the description clearly state what the tool does and how it differs from similar tools?

The description names the resource ('session local-all') and a verb ('Create or act'), but 'act on' is vague and does not specify what operations are performed. It does not differentiate from the closely named sibling create_session_local, leaving an agent uncertain about the tool's exact scope.

Agents choose between tools based on descriptions. A clear purpose with a specific verb and resource helps agents select the right tool.

Does the description explain when to use this tool, when not to, or what alternatives exist?

No guidance explains when to choose this tool over alternatives such as create_session_local or create_session_by_id_close. The only operative instruction is to read the matching GET or /schema endpoint first, which is a parameter-discovery tip rather than when-to-use guidance.

Agents often have multiple tools that could apply. Explicit usage guidance like "use X instead of Y when Z" prevents misuse.