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

With no annotations, the description carries the full behavioral burden. It discloses the return payload composition (which is genuinely useful since there is no output schema), but says nothing about what happens for an unknown breed slug, whether the source is live/cached, rate limits, or auth requirements. Read-only nature is only implied by "Get".

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?

A single sentence, front-loaded with the core action and resource followed by the payload inventory. Nothing is wasted, though the long comma-separated field list is slightly dense.

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?

Absent an output schema, listing the returned data is the right move and partially compensates. However, for a retrieval tool with no annotations, the definition omits error behavior for invalid slugs and any distinction from the closely named find_cat_breed 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?

Schema coverage is 100% with a single, well-documented 'breed' parameter including slug and display-name examples. The description adds no parameter detail beyond that, so the baseline of 3 for schema-documented params applies.

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 specific verb ("Get") and resource ("full profile of one cat breed") and enumerates the exact payload: identification markers, temperament, size/weight/lifespan/origin, health notes, similar breeds. Sibling differentiation is only implicit — it doesn't explicitly contrast with find_cat_breed or list_breeds, though "full profile of one" implies detail rather than search or enumeration.

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?

Usage is implied rather than stated: the agent can infer this is for fetching a detailed profile of a single known breed. There is no explicit when-to-use/when-not guidance, no mention of how it differs from find_cat_breed or compare_breeds, and no prerequisites or failure conditions given.

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