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

Annotations already declare readOnlyHint, idempotentHint, and destructiveHint=false, so the safety profile is fully covered by structured data. The description's added content (name, email, role) describes the return payload, which is redundant given an output schema exists, and it adds no new behavioral context. A 3 reflects a description that neither contradicts nor meaningfully enriches the annotations.

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?

A single front-loaded sentence with the action first and the identifier type immediately after, with zero filler. The trailing field list ('name, email, and role') is marginally redundant against the output schema, but it is compact enough not to hurt readability.

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?

Safety is covered by annotations, the return shape by the output schema, and the sole parameter by 'by UUID', so the essentials are present. The notable omission is a distinction from the sibling get-me, which is exactly the ambiguity an agent is most likely to hit for a 'get user' tool.

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 reported at 0% for a single path parameter, so the description must carry the meaning — and 'by UUID' does precisely that, matching the schema's uuid format. With only one parameter, this single phrase is sufficient to convey how to supply it, though it doesn't restate the pattern or error behavior for malformed IDs.

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?

States a clear verb+resource ('Get user profile') and adds the identifier type ('by UUID'), which implicitly separates it from list-users. However, it never distinguishes itself from the sibling get-me (presumably the current authenticated user), which an agent must disambiguate when both exist.

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 'by UUID' qualifier implies the precondition (you must already have a user's UUID), which is useful implied guidance. But there is no explicit when-to-use note and no naming of alternatives such as get-me or list-users, so the routing decision is left to inference.

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