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

Annotations already declare readOnlyHint=true, idempotentHint=true, destructiveHint=false and openWorldHint=false, so the safety profile is fully covered structurally. The description adds nothing beyond that — no note on authorization requirements for reading another user's permissions, no pagination or response-shape context, and the duplicated sentence carries no behavioral information.

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?

Very short, but the first sentence is duplicated verbatim, which is pure waste, and the only substantive content (the describe_operation pointer) is buried at the end rather than front-loaded.

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 no output schema, nested query object, and a required path parameter, the description should convey what is returned and how to target the right user. It conveys neither, leaving an agent to fall back on describe_operation or guesswork before the call can be made correctly.

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 description coverage is 0% for two parameters, including a nested free-form 'query' object and a required 'userId' with only length constraints. The description explains neither parameter — it doesn't say what userId identifies (internal ID vs email) or what the untyped 'query' object accepts, so it fails to compensate for the coverage gap.

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 is the endpoint path repeated twice: 'GET /api/users/:userId/permissions.' It names a resource and verb but only by restating the tool name/title, adding no explanation of what 'permissions' covers (role permissions? resource grants? inherited?) or how it differs from siblings like get_users_by_id or get_roles_by_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?

There is no statement of when to use this tool versus get_users_by_id, get_roles_by_id, or get_user_dashboards. The only routing hint is the trailing note that 'describe_operation provides native request schemas', which is about schema discovery, not usage selection.

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