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

The annotations already cover safety (readOnly, idempotent, closed-world), so the description's job is to add behavior, which it does by disclosing the determinism guarantee and the SHA-1 algorithm. It does not cover error behavior for invalid namespaces, which is a minor gap.

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 carries the determinism guarantee, the algorithm, and the namespace vocabulary with no wasted words.

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?

For a two-parameter pure function with annotations that make the safety profile clear and no output schema, this covers nearly everything an agent needs. The one omission is that the default namespace of dns is visible only in the schema, not the description.

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?

With 0% schema description coverage, the description must carry the parameter meaning, and it does enumerate the accepted namespace values (dns, url, oid, x500 or a raw UUID) that the schema leaves undocumented. The name parameter is only loosely characterized as "a name," so the compensation is good but not complete.

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 gives a specific verb+resource: it generates a deterministic name-based UUID v5 using SHA-1. The adjective "name-based" and "deterministic" implicitly separate it from the sibling generate_uuid (random) and inspect_uuid, but it never names those siblings explicitly.

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?

"Deterministic name-based" implies when to prefer this over a random UUID generator, but the choice is left to inference rather than stated outright. There is no explicit "use this when you need reproducible IDs, otherwise use generate_uuid" guidance.

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