get_user

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

With no annotations, the description carries full burden for behavioral disclosure. It fails to mention any behavioral traits such as whether authentication is required, what happens if the user does not exist, or if the operation is idempotent. Only the basic purpose is given.

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 extremely short (6 words). While concise, it is under-specified and lacks necessary details like parameter usage or behavioral context. It would benefit from at least one more sentence.

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 the tool's simplicity (one parameter, output schema exists), the description is minimally adequate. It states the purpose but lacks context about what 'details' means, how to interpret the output, or any prerequisites. The presence of an output schema partially compensates, but the description should still provide more guidance.

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?

The input schema has one required parameter 'username' with 0% description coverage. The description does not mention the parameter or its format, so it adds no meaning beyond the schema. For a single parameter, the description should at least reference 'username'.

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 verb 'get' and resource 'details for a specific user', which distinguishes it from siblings like list_users, create_user, etc. However, it does not explicitly mention the username parameter, making it slightly less precise than the calibration HIGH example.

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 usage guidelines are provided. The description does not mention when to use this tool versus alternatives like list_users or update_user. 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.