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

Annotations already declare readOnlyHint=true and destructiveHint=false, so the safety profile is covered. The description adds real value beyond them by enumerating the returned fields (name, email, role) and explicitly disclosing negative space: 'Login data is never returned' — a privacy constraint an agent would otherwise have to guess.

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 fragments with no filler; the identity scope comes first and the return shape follows. The trailing 'GET /user/me' endpoint path adds little for an agent caller but costs almost nothing.

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 zero params and no output schema, the description does the necessary work by listing the returned fields and stating what is withheld. It stops short of describing the response envelope or error/auth-failure behavior, but that gap is minor for a simple identity read.

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 tool takes zero parameters, so per the baseline the description carries no parameter burden. Nothing is mis-specified or missing.

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 resource and scope: 'The Tokeet user the API key belongs to (name, email, role)', which distinguishes it from tokeet_get_user (by id) and tokeet_list_users without needing the schema. It lacks an explicit verb, so it reads as a noun phrase rather than a crisp action statement.

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 phrase 'the API key belongs to' implicitly signals the authenticated-user context, but the description never states when to call this versus tokeet_get_user or tokeet_list_users, nor any prerequisites. No when-to-use or when-not-to-use guidance is given.

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