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

readOnlyHint=true already covers the safety profile, but the description adds a non-obvious behavioral guarantee not present in annotations: private relationship text is never exposed. That is a genuine, useful disclosure. It falls short of 5 because pagination behavior for limit/offset and the shape of the returned status are unaddressed.

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?

Two short sentences, front-loaded with the read scope followed by the privacy constraint. Efficient and free of filler, though the sparseness is arguably under-specification rather than tight writing.

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 two undocumented parameters, no output schema, no usage guidance, and ambiguous resource naming, the definition does not supply enough for 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?

Schema description coverage is 0% for both limit and offset, so the description must carry the burden and it says nothing about them. It neither explains the pagination convention nor whether the limits are enforced.

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 a verb ('Read') and a set of resources ('pets, pantry and actual care receipts'), so the intent is loosely inferable, but the terminology is idiosyncratic and it never clarifies what a 'nest status' actually is or how it differs from pet_care or pet_adopt.

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 of when to call this tool, what preconditions apply, or when a sibling like pet_care would be the better choice. The agent is left to infer usage entirely.

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 mark this as a non-readonly, non-destructive write, so the safety profile is covered. The description adds real value with the idempotency hint and the "some species need image setup" precondition, but leaves both vague (which species, what setup, what happens on failure).

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 sentences with no filler; the key constraint (idempotent retry) is easy to spot. It is efficient, though the terseness verges on under-specification rather than tight writing.

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 0% schema coverage, no output schema, and only two annotations, the description is too thin: it omits required-parameter formats, the meaning of kind, error/retry semantics beyond request_id, and any post-adoption state.

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 carry all parameter meaning, yet it only touches request_id (retry behavior) and obliquely kind ("species"). The name parameter and the accepted values for kind are entirely undocumented anywhere.

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?

States a verb and resource ("Adopt a pet"), which is enough to know the general action, but gives no indication of what adoption actually does in this system (creates a record? assigns an existing entity?) and never distinguishes it from sibling tools like pet_care or nest_status.

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 trigger is implied rather than specified: "when the user requests it" restates the obvious instead of giving concrete conditions. It does offer one useful operational guideline, reusing request_id on retries, but names no alternatives or exclusory cases.

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=true, so the read-only nature is covered. The description adds one genuinely useful behavioral fact — that it never queues paid images — which prevents an agent from expecting a paid-generation side effect. It doesn't mention pagination behavior despite limit/offset params.

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?

Two short sentences, no filler, front-loaded with the primary action. It could be slightly clearer about what 'activated stage' means, but there is no wasted text.

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 3-param read tool with readOnlyHint already covering safety, the description is minimally adequate but leaves the pagination semantics and param meanings unexplained. The 'factual life-photo sources' phrase hints at a source distinction that is never elaborated, so an agent may not know what it actually gets back.

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 all 3 params are bare, so the description carries the full burden of documenting them. It does not mention pet_id, limit, or offset at all, but with only 3 simple params and pagination conventions being fairly standard, it lands at the baseline rather than below it.

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 a resource ('activated stage portraits and factual life-photo sources') but the verb is buried in 'Read' and the phrasing is ambiguous jargon. An agent can infer this fetches photos for a pet, but it wouldn't clearly distinguish it from siblings like pet_care without opening the schema.

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 or when-not-to-use guidance is given relative to the siblings (nest_status, pet_adopt, pet_care). The clause 'Never queues paid images' offers a mild boundary, but it's phrased as a constraint on behavior, not as a routing rule between 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 only declare this is a non-read-only, non-destructive mutation, so the description adds real value: it defines idempotency semantics ('reuse request_id on retries') and clarifies that a successful receipt — not the call itself — is what confirms care occurred. It still does not say what scope does or whether care applies to multiple pets at once.

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?

Two short sentences with zero filler, and the action set is front-loaded before the receipt/retry semantics. Every clause carries information.

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 4-parameter mutation tool with no output schema, the description covers the action space and retry contract but omits what 'scope' and 'pet_ids' control and what a failure response looks like. Enough to attempt a call, not enough to call it 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?

With 0% schema description coverage, the description must carry the parameter burden. It successfully explains request_id as a retry-safe idempotency key and hints at the action values via 'feed, play or comfort', but leaves 'scope' and 'pet_ids' entirely undefined in both the schema and the 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?

Names the concrete actions (feed, play, comfort) and implies the resource is a pet, so an agent knows what the tool does. It does not explicitly contrast itself with pet_adopt or nest_status, but the verb set makes the distinction inferable rather than stated.

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 when-to-use guidance, no prerequisites, and no mention of when not to use this versus the sibling tools. The only operational instruction is about retries, which is a reliability note rather than a usage rule.

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