get_user_by_query_v1_users_get

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

No annotations are provided, so the description must carry the full behavioral burden. It states the endpoint is public and no auth required, but fails to disclose behavior when username is not provided (schema allows null), response shape details beyond 'same shape as user_id endpoint', or error handling.

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 somewhat redundant, repeating 'Look up user by username' twice. It could be more concise, but it is clear and front-loads key 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?

Given no output schema and no annotations, the description should provide more context on expected behavior when username is omitted, response format, and potential errors. It only mentions 'public profile' without further detail.

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 clear description ('Username to look up'). The description repeats this without adding deeper details like constraints or format, so baseline 3 is appropriate.

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 clearly states the tool's purpose: look up a user by username, returning the public profile. It distinguishes from sibling tools like get_user_profile_v1_users__user_id__get by specifying the lookup by username rather than user 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 description implies usage when a username is available, but does not explicitly contrast with sibling tools like get_user_profile_v1_users__user_id__get. It notes the endpoint is public and requires no authentication, which provides context.

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