get_v1_user_by_username

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

No annotations provided; description only notes 'one request required' (trivial) and omits behavioral traits like read-only nature, auth needs, rate limits, or error handling. The GET method implies safety but is not stated.

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?

Short but contains duplicate sentences ('Get user object by username'). The HTTP method and path in brackets are useful, but redundancy reduces efficiency.

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?

Adequate for a simple lookup tool, but missing details on response structure, error responses, or pagination (if any). For a single-parameter read operation, it's minimally 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 has 0% description coverage, so description must compensate. It only mentions 'by username' without clarifying format, case sensitivity, or constraints, adding minimal value beyond the 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 clearly states 'Get user object by username', which is specific and aligns with the tool name. It distinguishes from the by/id sibling by mentioning efficiency, though the duplicate sentence slightly reduces clarity.

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?

Explicitly advises using the by/id endpoint for speed, providing a clear alternative and when-not-to-use scenario, which is excellent guidance.

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