Generate UUID

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

Annotations already cover read-only and non-destructive behavior. The description adds the critical behavioral trait of cryptographic randomness and warns about the pitfalls of hand-written UUIDs, which is beyond the structured annotations. It does not mention output format or repetition, but those are implied.

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?

Two sentences with zero waste. The purpose is front-loaded, and the usage guidance follows immediately. The web link is a bonus, not fluff.

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 simple tool with two optional parameters and no output schema, the description fully covers what an agent needs to call it correctly: purpose, usage context, and the key caveat about randomness. Nothing essential is missing.

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 100% for both count and uppercase parameters. The description does not add any parameter-specific meaning, but since the schema fully documents them, the baseline of 3 is appropriate.

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 specific verb ('Generate') and resource ('UUID v4 identifiers'), clearly distinguishing this from random string tools. The mention of 'cryptographically random' and the explicit contrast with model-authored UUIDs makes the purpose unambiguous.

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?

Explicitly instructs to use this tool instead of writing UUIDs manually, warning that model-authored UUIDs are not random and repeat across sessions. This provides clear when-to-use guidance and implicitly covers the alternative.

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