Server Quality Checklist

Tool Scores

• discord_delete_messageC
  2.7/5.0
  Behavior1/5

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

  No annotations are provided, so the description carries the full burden of behavioral disclosure. 'Delete a message' implies a destructive mutation, but the description fails to mention critical behavioral aspects: whether this requires specific permissions (e.g., MANAGE_MESSAGES or ownership), if deletions are permanent/irreversible, rate limits, error conditions (e.g., message not found), or what happens upon success. This leaves significant gaps for an agent to understand the tool's behavior.

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

  Conciseness5/5

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

  The description is extremely concise at just three words, front-loading the core action ('Delete a message') with zero wasted language. Every word earns its place by directly stating the tool's function without unnecessary elaboration.

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

  Completeness2/5

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

  Given the tool's complexity (a destructive mutation with no annotations and no output schema), the description is incomplete. It lacks essential context: behavioral traits (permissions, permanence), usage guidelines, and any information about return values or errors. While the schema covers parameters well, the description fails to address the broader operational context needed for safe and effective use.

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

  Parameters3/5

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

  The input schema has 100% description coverage, with clear documentation for both 'channelId' and 'messageId' parameters. The description adds no additional semantic information beyond what's in the schema (e.g., format examples, relationship between parameters, or constraints). With high schema coverage, the baseline score of 3 is appropriate as the schema adequately handles parameter documentation.

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

  Purpose4/5

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

  The description clearly states the action ('Delete') and resource ('a message'), making the purpose immediately understandable. However, it doesn't differentiate this tool from sibling tools like 'discord_remove_reaction' or 'discord_cleanup_download' that also involve removal operations, nor does it specify what type of message (e.g., user's own message vs. any message with permissions).

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

  Usage Guidelines2/5

  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. There's no mention of prerequisites (e.g., needing appropriate permissions), when not to use it (e.g., for bulk deletion vs. single messages), or how it differs from related tools like 'discord_cleanup_download' or 'discord_remove_reaction' in the sibling list.

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

• discord_add_reactionC
  2.9/5.0
  Behavior2/5

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

  With no annotations provided, the description carries full burden for behavioral disclosure. While 'Add a reaction' implies a write operation, it doesn't specify whether this requires specific permissions, if there are rate limits, what happens if the emoji is invalid, or what the typical response looks like. The description is minimal and lacks important 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.

  Conciseness5/5

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

  The description is extremely concise at just 5 words, front-loading the core purpose with zero wasted words. Every word earns its place, making it efficient for quick understanding.

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

  Completeness2/5

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

  For a mutation tool with no annotations and no output schema, the description is insufficient. It doesn't explain what happens after the reaction is added, what errors might occur, or any behavioral nuances. Given the complexity of Discord interactions and lack of structured metadata, more context is needed.

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

  Parameters3/5

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

  The input schema has 100% description coverage, with each parameter clearly documented in the schema itself. The description adds no additional parameter information beyond what's already in the schema, so it meets the baseline for high schema coverage but doesn't provide extra value.

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

  Purpose4/5

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

  The description clearly states the action ('Add a reaction') and target resource ('to a message'), making the purpose immediately understandable. However, it doesn't differentiate from sibling tools like 'discord_remove_reaction' or specify what types of reactions are supported beyond the basic concept.

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

  Usage Guidelines2/5

  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 like 'discord_remove_reaction' or 'discord_edit_message' (which might include reactions). There's no mention of prerequisites, permissions needed, or typical use cases in the Discord context.

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

• discord_cleanup_downloadC
  2.9/5.0
  Behavior2/5

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

  With no annotations provided, the description carries full burden for behavioral disclosure. While 'clean up' implies deletion/removal, it doesn't specify whether this is reversible, what permissions are required, whether it affects the original Discord server content, or what happens if the file doesn't exist. For a tool that likely performs file system operations, this is insufficient 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.

  Conciseness5/5

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

  The description is a single, efficient sentence that gets straight to the point. Every word serves a purpose - 'Clean up' (action), 'previously downloaded' (context), 'Discord attachment file' (resource). There's no wasted verbiage or unnecessary elaboration.

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

  Completeness2/5

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

  For a tool that performs file cleanup operations with no annotations and no output schema, the description is too minimal. It doesn't explain what 'clean up' means operationally (delete? move to trash?), what happens on success/failure, or any side effects. Given the potential for destructive file operations, more context is needed.

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

  Parameters3/5

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

  Schema description coverage is 100% with the single 'path' parameter well-documented in the schema. The description doesn't add any parameter-specific information beyond what's already in the schema (which states 'File path to clean up'). This meets the baseline expectation when schema coverage is complete.

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

  Purpose4/5

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

  The description clearly states the action ('Clean up') and the target ('a previously downloaded Discord attachment file'), making the purpose immediately understandable. However, it doesn't explicitly differentiate from sibling tools like 'discord_delete_message' or 'discord_remove_reaction' which also involve cleanup/deletion operations, though the specific resource type (attachment file) provides some distinction.

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

  Usage Guidelines2/5

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

  The description provides minimal guidance - it mentions 'previously downloaded' which implies a prerequisite but doesn't specify when to use this tool versus alternatives. There's no explicit 'when-not' guidance or comparison to sibling tools like 'discord_delete_message' for message cleanup versus file cleanup.

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

• discord_create_dmC
  2.9/5.0
  Behavior2/5

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

  With no annotations provided, the description carries the full burden of behavioral disclosure. It mentions 'create or get existing', hinting at idempotent behavior, but fails to detail critical aspects like permissions required, rate limits, whether it returns a channel ID or object, or if it's a read-only or mutative operation. This leaves significant gaps for an agent to understand the tool's behavior.

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

  Conciseness5/5

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

  The description is a single, efficient sentence that directly states the tool's function without any fluff. It's front-loaded with the core action, making it easy to parse and understand quickly.

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

  Completeness2/5

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

  For a tool with no annotations and no output schema, the description is insufficient. It doesn't explain what the tool returns (e.g., a channel object or ID), error handling, or how it interacts with sibling tools. Given the complexity of Discord operations and the lack of structured data, more context is needed for the agent to use this tool effectively.

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

  Parameters3/5

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

  The input schema has 100% description coverage, with 'userId' clearly documented as 'The user ID to create DM with'. The description adds no additional parameter semantics beyond this, such as format examples or constraints. Given the high schema coverage, a baseline score of 3 is appropriate as the schema does the heavy lifting.

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

  Purpose4/5

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

  The description clearly states the verb ('create or get') and resource ('DM channel with a user'), making the purpose immediately understandable. However, it doesn't explicitly differentiate from sibling tools like 'discord_get_dm_channels' which might retrieve multiple DM channels, so it falls short of a perfect score.

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

  Usage Guidelines2/5

  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 'discord_get_dm_channels' for listing existing DMs or 'discord_send_message' for messaging without channel creation. There's no mention of prerequisites, error conditions, or typical use cases, leaving the agent to infer usage.

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

• discord_edit_messageC
  2.9/5.0
  Behavior2/5

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

  With no annotations provided, the description carries full burden but only states the basic action. It doesn't disclose behavioral traits like whether edits are rate-limited, if they require specific permissions (e.g., manage messages), what happens on failure, or Discord's edit constraints (e.g., time limits). The description is minimal and lacks crucial operational context.

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

  Conciseness5/5

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

  The description is a single, efficient sentence with zero wasted words. It's front-loaded with the core action and resource, making it easy to parse. Every word earns its place, achieving maximum clarity with minimal length.

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

  Completeness2/5

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

  For a mutation tool with no annotations and no output schema, the description is incomplete. It doesn't cover behavioral aspects (permissions, rate limits, Discord constraints), error handling, or return values. Given the complexity of editing messages in Discord, more context is needed for effective agent use.

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

  Parameters3/5

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

  Schema description coverage is 100%, with all three parameters clearly documented in the schema (channelId, messageId, content). The description adds no additional parameter semantics beyond implying 'content' is editable. Baseline score of 3 is appropriate since the schema does the heavy lifting.

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

  Purpose4/5

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

  The description clearly states the action ('Edit') and resource ('a previously sent message'), making the purpose immediately understandable. It distinguishes from siblings like discord_send_message (create new) and discord_delete_message (remove). However, it doesn't specify what aspects can be edited beyond content, which the schema reveals.

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

  Usage Guidelines2/5

  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 doesn't mention prerequisites (e.g., needing message ownership/permissions), compare to discord_send_message for new messages, or indicate limitations like edit time windows in Discord. Usage context is implied but not explicit.

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

• discord_get_message_historyC
  2.9/5.0
  Behavior2/5

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

  With no annotations provided, the description carries full burden for behavioral disclosure. It states this is a 'Get' operation but doesn't mention whether this requires specific permissions, rate limits, pagination behavior, or what the return format looks like. For a tool with 5 parameters and no output schema, this leaves significant gaps in understanding how the tool behaves.

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

  Conciseness5/5

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

  The description is a single, efficient sentence that states the core purpose without unnecessary words. It's appropriately sized for a retrieval tool and front-loads the essential information. Every word earns its place.

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

  Completeness2/5

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

  Given the tool has 5 parameters, no annotations, and no output schema, the description is inadequate. It doesn't explain what the tool returns (message objects, format, structure), doesn't mention rate limits or permissions needed, and provides no guidance on usage context. For a message history tool in a Discord API context, this leaves too many open questions.

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

  Parameters3/5

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

  Schema description coverage is 100%, so the schema already documents all 5 parameters thoroughly. The description adds minimal value by mentioning 'optional filtering' which hints at the before/after/around parameters, but doesn't provide additional context beyond what's in the schema. This meets the baseline for high schema coverage.

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

  Purpose4/5

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

  The description clearly states the verb 'Get' and resource 'message history from a Discord channel', making the purpose unambiguous. It distinguishes from some siblings like discord_get_message (single message) and discord_search_messages (search functionality), though not explicitly. However, it doesn't fully differentiate from all read operations like discord_get_channel.

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

  Usage Guidelines2/5

  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 like discord_search_messages or discord_get_message. It mentions 'optional filtering' but doesn't explain what filtering options exist or when to choose this over other message retrieval tools. No prerequisites or exclusions are stated.

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

• discord_list_attachmentsC
  2.9/5.0
  Behavior2/5

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

  With no annotations provided, the description carries the full burden of behavioral disclosure. It mentions scanning 'recent messages' but doesn't specify how far back 'recent' extends, whether there are rate limits, authentication requirements, or what the output format looks like (e.g., list of URLs, file names, sizes). For a tool with 5 parameters and no output schema, this leaves significant behavioral gaps.

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

  Conciseness5/5

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

  The description is a single, efficient sentence that front-loads the core purpose without unnecessary words. Every part of the sentence contributes directly to understanding what the tool does, making it highly concise and well-structured.

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

  Completeness2/5

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

  Given the tool's complexity (5 parameters, no output schema, and no annotations), the description is insufficient. It doesn't explain the return values, potential errors, or behavioral nuances like how 'recent messages' are defined or if there are pagination considerations. For a tool that likely returns structured data about attachments, more context is needed to use it effectively.

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

  Parameters3/5

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

  Schema description coverage is 100%, so the schema fully documents each parameter's purpose and constraints. The description adds no additional parameter semantics beyond implying that attachments are sourced from 'recent messages,' which is already covered by the 'limit' parameter in the schema. This meets the baseline for high schema coverage.

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

  Purpose4/5

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

  The description clearly states the action ('List all attachments') and resource ('in a Discord channel from recent messages'), making the purpose immediately understandable. However, it doesn't differentiate from sibling tools like 'discord_search_messages' or 'discord_get_message_history' that might also retrieve message content including attachments, leaving room for ambiguity about when to choose this specific tool.

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

  Usage Guidelines2/5

  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 like 'discord_search_messages' or 'discord_get_message_history', nor does it mention any prerequisites or constraints beyond what's implied by the parameters. It lacks explicit usage context, making it unclear how this tool fits within the broader Discord toolset.

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

• discord_remove_friendC
  2.9/5.0
  Behavior2/5

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

  No annotations are provided, so the description carries the full burden of behavioral disclosure. It mentions the action but does not specify whether this is a destructive operation, if it requires specific permissions, what happens to the friend relationship (e.g., irreversible removal), or any rate limits. This leaves significant gaps in understanding the tool's behavior.

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

  Conciseness5/5

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

  The description is extremely concise—a single, clear sentence that directly states the tool's purpose without any unnecessary words. It is front-loaded and efficient, making it easy to understand at a glance.

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

  Completeness2/5

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

  Given the complexity of a social interaction tool with no annotations and no output schema, the description is insufficient. It lacks details on behavioral aspects (e.g., whether removal is permanent), usage context, or what to expect upon execution, making it incomplete for safe and effective use by an AI agent.

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

  Parameters3/5

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

  The input schema has 100% description coverage, with the parameter 'userId' clearly documented as 'User ID to remove as friend'. The description does not add any additional meaning beyond this, such as format examples or constraints, so it meets the baseline for high schema coverage without compensating further.

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

  Purpose4/5

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

  The description clearly states the action ('Remove' or 'cancel') and the resource ('a friend' or 'a friend request'), making the purpose evident. However, it does not explicitly differentiate from sibling tools like 'discord_get_friends' (which lists friends) or 'discord_add_friend' (which adds friends), though the verb 'remove' inherently contrasts with 'add'.

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

  Usage Guidelines2/5

  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 whether it's for removing existing friends or canceling pending requests, or any prerequisites like user permissions. It lacks explicit context or exclusions, leaving usage ambiguous beyond the basic action stated.

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

• discord_remove_reactionC
  2.9/5.0
  Behavior2/5

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

  With no annotations provided, the description carries full burden for behavioral disclosure. While 'Remove' implies a destructive/mutative operation, the description doesn't specify permission requirements, rate limits, whether removal is reversible, what happens if the reaction doesn't exist, or what the response looks like. For a mutation tool with zero annotation coverage, this is a significant gap in behavioral transparency.

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

  Conciseness5/5

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

  The description is a single, clear sentence with zero wasted words. It's front-loaded with the core action and target, making it immediately understandable. Every word earns its place, and there's no redundancy or unnecessary elaboration.

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

  Completeness2/5

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

  For a mutation tool with no annotations and no output schema, the description is incomplete. It doesn't explain what happens after removal (success/failure indicators), permission requirements, error conditions, or how this operation fits within Discord's reaction ecosystem. The description alone doesn't provide enough context for safe, effective use of this tool.

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

  Parameters3/5

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

  Schema description coverage is 100%, so the schema already documents all four parameters thoroughly. The description adds no additional parameter information beyond what's in the schema. The baseline score of 3 reflects adequate coverage when the schema does the heavy lifting, though the description doesn't compensate with any extra semantic context about parameter relationships or usage patterns.

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

  Purpose4/5

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

  The description clearly states the action ('Remove') and target ('a reaction from a message'), making the purpose immediately understandable. It distinguishes from obvious siblings like 'discord_add_reaction' by specifying removal rather than addition. However, it doesn't differentiate from more distant siblings like 'discord_delete_message' or 'discord_edit_message' which also modify messages.

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

  Usage Guidelines2/5

  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 doesn't mention prerequisites (like needing appropriate permissions), when removal is appropriate versus other message modifications, or how it differs from related tools like 'discord_delete_message' (which removes the entire message rather than just a reaction).

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

• discord_search_messagesC
  2.9/5.0
  Behavior2/5

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

  No annotations are provided, so the description carries full burden for behavioral disclosure. While 'search' implies a read operation, the description doesn't mention important behavioral aspects: whether this requires specific permissions, rate limits, pagination behavior, or what the return format looks like. For a search tool with 9 parameters and no annotations, this is inadequate.

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

  Conciseness5/5

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

  The description is a single, efficient sentence that communicates the core functionality without unnecessary words. It's appropriately sized for a search tool and front-loads the essential information. Every word earns its place.

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

  Completeness2/5

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

  Given the tool's complexity (9 parameters, no output schema, no annotations), the description is insufficient. It doesn't explain what the search returns, how results are ordered, whether it's paginated, or any limitations. For a search operation in a messaging platform, users need to understand the result format and constraints.

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

  Parameters3/5

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

  Schema description coverage is 100%, so the schema already documents all 9 parameters thoroughly. The description adds minimal value beyond the schema by mentioning 'text query and filters', which aligns with the schema's documented parameters. With complete schema coverage, the baseline score of 3 is appropriate.

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

  Purpose4/5

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

  The description clearly states the tool's purpose: 'Search for messages in a Discord channel with text query and filters'. It specifies the verb ('search'), resource ('messages'), and domain ('Discord channel'), making it easy to understand. However, it doesn't explicitly differentiate from sibling tools like 'discord_get_message_history' or 'discord_get_message', which might have overlapping functionality.

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

  Usage Guidelines2/5

  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. With siblings like 'discord_get_message_history' and 'discord_get_message', there's no indication of when this search tool is preferred over those retrieval tools. The description only states what it does, not when it's appropriate.

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

• discord_send_messageC
  2.9/5.0
  Behavior2/5

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

  With no annotations provided, the description carries full burden but lacks critical behavioral details. It mentions file attachment limits but omits permissions needed, rate limits, message formatting options, error conditions, or what happens on success. For a write operation with no annotation coverage, this is insufficient.

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

  Conciseness5/5

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

  The description is a single, efficient sentence that front-loads the core purpose and includes the key optional feature. There's no wasted verbiage or redundancy, making it easy to parse quickly.

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

  Completeness2/5

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

  For a write operation with 5 parameters, no annotations, and no output schema, the description is incomplete. It doesn't address behavioral aspects like authentication needs, side effects, or response format, leaving significant gaps for an agent to understand tool invocation fully.

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

  Parameters3/5

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

  Schema description coverage is 100%, so parameters are well-documented in the schema. The description adds minimal value by noting the optional file attachment capability (up to 10 files), which aligns with the schema's maxItems constraint but doesn't provide additional semantic context beyond what's already in structured fields.

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

  Purpose4/5

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

  The description clearly states the action ('Send a message') and target resource ('to a Discord channel'), with the optional capability of including files. It distinguishes itself from siblings like discord_edit_message or discord_delete_message by focusing on message creation, though it doesn't explicitly contrast with all messaging-related tools.

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

  Usage Guidelines2/5

  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 doesn't mention prerequisites (e.g., channel access), compare with discord_edit_message for updates, or indicate when file attachments are appropriate versus other methods.

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

• discord_add_friendB
  3.1/5.0
  Behavior2/5

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

  With no annotations provided, the description carries the full burden of behavioral disclosure. It states the action but doesn't cover critical aspects like required permissions, rate limits, response format, or whether the request is reversible. This leaves significant gaps for a mutation tool.

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

  Conciseness5/5

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

  The description is a single, efficient sentence with zero waste. It's front-loaded with the core action, making it easy to parse quickly without unnecessary elaboration.

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

  Completeness2/5

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

  For a mutation tool with no annotations and no output schema, the description is incomplete. It lacks details on behavioral traits (e.g., auth needs, error handling) and doesn't explain what the tool returns, leaving the agent with insufficient context for reliable use.

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

  Parameters4/5

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

  The input schema has 0 parameters with 100% coverage, so no parameter documentation is needed. The description doesn't add param details, but this is acceptable given the schema's completeness, warranting a baseline score above minimum viable.

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

  Purpose4/5

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

  The description clearly states the action ('Send a friend request') and the target ('to a user'), providing a specific verb+resource combination. However, it doesn't differentiate from sibling tools like 'discord_remove_friend' or 'discord_get_friends', which would require explicit comparison for a perfect score.

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

  Usage Guidelines2/5

  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. The description lacks context about prerequisites (e.g., needing a user ID), exclusions, or comparisons to siblings like 'discord_remove_friend' for friend management or 'discord_create_dm' for initiating communication.

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

• discord_clear_presenceB
  3.1/5.0
  Behavior2/5

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

  With no annotations provided, the description carries the full burden of behavioral disclosure. It states the action ('clear') but doesn't explain what 'clear' entails (e.g., removes status, sets to offline, requires user permissions), potential side effects, or response behavior. This leaves significant gaps for a mutation tool.

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

  Conciseness5/5

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

  The description is a single, efficient sentence with zero waste. It's front-loaded with the core action and resource, making it easy to parse quickly without unnecessary elaboration.

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

  Completeness2/5

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

  Given the tool's mutation nature (clearing presence), lack of annotations, and no output schema, the description is incomplete. It doesn't cover behavioral aspects like what 'clear' means operationally, authentication needs, or expected outcomes, which are crucial for safe and effective use.

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

  Parameters4/5

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

  The tool has 0 parameters with 100% schema description coverage, so the schema fully documents the lack of inputs. The description doesn't need to add parameter details, and it correctly implies no inputs are required, aligning with the schema.

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

  Purpose4/5

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

  The description clearly states the action ('Clear') and the resource ('your Discord presence/activity'), making the purpose immediately understandable. It doesn't explicitly differentiate from sibling tools like 'discord_update_presence', but the verb 'clear' versus 'update' provides implicit distinction.

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

  Usage Guidelines2/5

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

  No explicit guidance on when to use this tool versus alternatives is provided. The description implies usage when clearing presence is needed, but it doesn't mention prerequisites, timing considerations, or how it relates to 'discord_update_presence' for setting a new presence.

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

• discord_get_channelB
  3.1/5.0
  Behavior2/5

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

  No annotations are provided, so the description carries full burden for behavioral disclosure. While 'Get information' implies a read-only operation, it doesn't specify authentication requirements, rate limits, error conditions, or what specific information is returned. For a tool with zero annotation coverage, this leaves significant behavioral gaps.

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

  Conciseness5/5

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

  The description is a single, efficient sentence that communicates the core purpose without any wasted words. It's appropriately sized for a simple retrieval tool and gets straight to the point.

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

  Completeness3/5

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

  For a simple read operation with one parameter and no output schema, the description is minimally adequate. However, with no annotations and no output schema, it should ideally provide more context about what information is returned and any behavioral constraints. The description does the bare minimum for this tool's complexity level.

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

  Parameters3/5

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

  With 100% schema description coverage, the single parameter 'channelId' is already documented in the schema. The description doesn't add any additional context about parameter usage, format requirements, or examples beyond what the schema provides, meeting the baseline expectation.

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

  Purpose4/5

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

  The description clearly states the verb 'Get' and resource 'information about a Discord channel', making the purpose immediately understandable. However, it doesn't differentiate from sibling tools like 'discord_get_dm_channels' or 'discord_get_message', which also retrieve Discord data but for different resources.

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

  Usage Guidelines2/5

  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. With siblings like 'discord_get_dm_channels' and 'discord_get_message' that also retrieve Discord information, there's no indication of when this specific channel information tool is appropriate versus those other retrieval tools.

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

• discord_get_friendsB
  3.1/5.0
  Behavior2/5

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

  With no annotations provided, the description carries full burden but offers minimal behavioral insight. It implies a read-only operation but doesn't disclose authentication needs, rate limits, return format, or error conditions. This is inadequate for a tool that likely interacts with user data.

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

  Conciseness5/5

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

  The description is a single, clear sentence that efficiently communicates the core functionality without any wasted words. It's front-loaded and appropriately sized for a simple tool.

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

  Completeness2/5

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

  Given the lack of annotations and output schema, the description is insufficiently complete. It doesn't explain what the returned friend list contains, how it's structured, or any behavioral constraints, leaving significant gaps for the agent to operate effectively.

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

  Parameters4/5

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

  The tool has 0 parameters with 100% schema coverage, so the schema already fully documents the lack of inputs. The description appropriately doesn't add parameter details, maintaining focus on the tool's purpose without redundancy.

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

  Purpose4/5

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

  The description clearly states the action ('Get list of friends') and the resource ('for the current user'), making the purpose immediately understandable. However, it doesn't differentiate from sibling tools like 'discord_get_dm_channels' or 'discord_get_channel' beyond the specific resource type, which prevents a perfect score.

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

  Usage Guidelines2/5

  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 doesn't mention prerequisites, context, or exclusions, leaving the agent to infer usage from the tool name alone among many Discord-related siblings.

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

• discord_get_messageB
  3.1/5.0
  Behavior2/5

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

  With no annotations provided, the description carries the full burden of behavioral disclosure. It mentions 'full attachment details,' which adds context about return data, but lacks critical information such as authentication requirements, rate limits, error conditions (e.g., if the message doesn't exist), or whether this is a read-only operation (implied by 'Get' but not explicit).

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

  Conciseness5/5

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

  The description is a single, efficient sentence that front-loads the core purpose ('Get a specific message by ID') and adds a useful detail ('with full attachment details'). There is no wasted verbiage, making it highly concise and well-structured.

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

  Completeness3/5

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

  Given the tool's low complexity (2 parameters, no output schema, no annotations), the description is somewhat complete but has gaps. It covers the basic purpose and hints at return data, but without annotations or output schema, it should ideally mention behavioral aspects like read-only nature or error handling to be fully adequate for agent use.

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

  Parameters3/5

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

  Schema description coverage is 100%, so the schema already documents both parameters (channelId and messageId) adequately. The description adds minimal value beyond the schema by implying the tool retrieves a message using these IDs, but it doesn't provide additional semantics like format examples or constraints beyond what's in the schema.

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

  Purpose4/5

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

  The description clearly states the action ('Get') and resource ('a specific message by ID'), distinguishing it from siblings like discord_get_message_history (which retrieves multiple messages) and discord_search_messages (which searches). However, it doesn't explicitly contrast with discord_get_channel, which might also retrieve messages indirectly, leaving some ambiguity.

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

  Usage Guidelines2/5

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

  No explicit guidance on when to use this tool versus alternatives like discord_get_message_history or discord_search_messages is provided. The description implies usage for retrieving a single known message ID, but it doesn't state prerequisites (e.g., needing channel access) or exclusions (e.g., not for bulk retrieval).

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

• discord_update_presenceB
  3.1/5.0
  Behavior2/5

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

  With no annotations provided, the description carries the full burden of behavioral disclosure. It states this is an update operation, implying mutation, but doesn't disclose any behavioral traits like whether this requires authentication, if it's rate-limited, what happens when invalid parameters are provided, or what the expected response looks like. For a mutation tool with zero annotation coverage, this leaves significant gaps.

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

  Conciseness5/5

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

  The description is a single, efficient sentence that gets straight to the point with zero wasted words. It's appropriately sized for a tool with clear purpose and good schema documentation, making it easy for an agent to parse quickly.

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

  Completeness3/5

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

  For a mutation tool with no annotations and no output schema, the description is minimally adequate. The purpose is clear and the schema provides complete parameter documentation, but there's no information about behavioral aspects, error conditions, or return values. Given the complexity of updating presence with multiple parameters and no structured safety information, the description should do more to compensate.

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

  Parameters3/5

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

  The schema description coverage is 100%, with all parameters well-documented in the schema itself. The description doesn't add any meaningful parameter semantics beyond what's already in the schema - it doesn't explain relationships between parameters, provide examples, or clarify edge cases. With complete schema coverage, the baseline score of 3 is appropriate.

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

  Purpose4/5

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

  The description clearly states the verb ('Update') and resource ('your Discord presence/status'), making the purpose immediately understandable. It distinguishes this from sibling tools like discord_clear_presence by specifying it's for updating rather than clearing. However, it doesn't explicitly mention what aspects of presence can be updated beyond the generic term.

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

  Usage Guidelines2/5

  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 doesn't mention when you might prefer discord_clear_presence instead, nor does it provide any context about prerequisites, permissions, or typical use cases. The agent must infer usage from the tool name alone.

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

• discord_get_dm_channelsB
  3.2/5.0
  Behavior2/5

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

  With no annotations provided, the description carries the full burden of behavioral disclosure. It states what the tool does but lacks critical details: it doesn't specify if this is a read-only operation, what permissions are required, how results are formatted (e.g., pagination, sorting), or potential rate limits. For a tool with zero annotation coverage, this leaves significant gaps in understanding its behavior.

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

  Conciseness5/5

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

  The description is a single, efficient sentence that front-loads the core purpose without any wasted words. It directly communicates the action and target, making it easy to parse quickly. Every part of the sentence earns its place by specifying the resource type and scope.

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

  Completeness3/5

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

  Given the tool's simplicity (0 parameters, no output schema, no annotations), the description is minimally adequate. It states what the tool does but lacks context about authentication needs, return format, or error handling. Without annotations or output schema, the description should ideally provide more behavioral details to be fully complete for agent use.

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

  Parameters4/5

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

  The input schema has 0 parameters with 100% coverage, so the schema fully documents the absence of inputs. The description adds no parameter information, which is appropriate here since no parameters exist. A baseline of 4 is justified as the description doesn't need to compensate for any schema gaps, and it correctly implies no inputs are required.

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

  Purpose4/5

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

  The description clearly states the verb ('Get list of') and resource ('DM channels for the current user'), making the purpose immediately understandable. It distinguishes from siblings like discord_get_channel (general channels) and discord_get_friends (friends list), though it doesn't explicitly name these alternatives. The description is specific about the resource type and scope.

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

  Usage Guidelines2/5

  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 doesn't mention prerequisites (e.g., needing authentication), nor does it differentiate from similar tools like discord_get_channel or discord_create_dm. The agent must infer usage context from the tool name alone, which is insufficient for optimal selection.

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

• discord_download_attachmentB
  3.3/5.0
  Behavior2/5

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

  With no annotations provided, the description carries the full burden of behavioral disclosure. It states the action ('Download') and output ('return it as MCP file reference'), but lacks details on permissions required, rate limits, error handling, or whether the download is cached/persistent. This is a significant gap for a download operation with zero annotation coverage.

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

  Conciseness5/5

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

  The description is a single, efficient sentence that front-loads the core action and output without any wasted words. Every element ('Download a Discord attachment', 'return it as MCP file reference') directly contributes to understanding the tool's function.

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

  Completeness3/5

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

  Given the tool's moderate complexity (a download operation with one parameter) and no output schema, the description is minimally adequate. It covers the basic purpose and output format but lacks behavioral context (e.g., side effects, error cases) and usage guidelines, which are needed for full completeness.

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

  Parameters3/5

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

  The schema description coverage is 100%, with the single parameter 'url' fully documented in the schema as 'Discord CDN URL of the attachment to download'. The description adds no additional parameter semantics beyond what the schema provides, so the baseline score of 3 is appropriate.

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

  Purpose5/5

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

  The description clearly states the specific action ('Download a Discord attachment') and the resource ('Discord attachment'), distinguishing it from sibling tools like 'discord_list_attachments' (which lists) or 'discord_send_message' (which sends). It precisely defines the verb and target without redundancy.

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

  Usage Guidelines2/5

  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 doesn't mention prerequisites (e.g., needing a valid Discord CDN URL from another tool like 'discord_list_attachments'), exclusions, or contextual usage scenarios, leaving the agent to infer based on tool names alone.

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