uuid_v4

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

There are no annotations, so the description carries the full burden. It discloses the key behavior: random generation of UUID v4 strings, and the 'one or more' wording hints at count support. However, it does not specify the return shape (e.g., single string vs. array when count > 1) or whether the randomness source is cryptographically secure. For a simple stateless generator, the core is clear, but there is still room to explain the output format.

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 zero filler. Every word earns its place: 'Generate' states the action, 'random UUID v4' specifies the exact object, and 'one or more' captures the only parameter scope. There is no unnecessary detail.

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?

This is a low-complexity tool with one optional parameter, full schema coverage, no output schema, and clear sibling distinction. The description plus schema give an agent enough to call it correctly. minor gap: it does not explicitly state that output will be one string or an array of strings when count > 1, nor does it situate this versus password generation, so it is not a full 5.

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%, with the count parameter fully documented as 'how many (default 1, max 100)'. The description does not add additional parameter semantics beyond the schema, but the schema fully covers it, so 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'), a specific resource ('random UUID v4 strings'), and the count scope ('one or more'). This clearly distinguishes it from sibling tools like base64_encode, sha_hash, and password_generate, since UUID v4 generation is unique among them.

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 description implies the use case — when you need a UUID v4 string — but it does not explicitly state when to prefer this over alternatives, nor does it mention any exclusions or special contexts. Sibling tools such as password_generate or url_encode are not referenced, leaving the boundary to inference.

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