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

There are no annotations, so the description must carry the burden. It discloses the cost ($0.001 USDC) which is useful, and implies the operation is non-destructive (generating new data). However, it doesn't mention any randomness guarantees for v4 or time-based properties for v7, and it doesn't state whether the tool is idempotent or handles errors.

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?

The description is extremely concise, two sentences, with no fluff. It front-loads the primary action (generate UUIDs) and quickly covers versions and cost. Every word adds value.

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?

Given the simplicity of the tool, the description is nearly complete. It covers purpose and cost. However, it might benefit from noting that the tool is deterministic (if it is) or mentioning any rate limits beyond the cost. But for a simple generator, this suffices.

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?

The schema has 100% coverage with descriptions for both parameters, including enums for version and range for count. The description adds little beyond restating the purpose. It could clarify that count is the number per call and version is the format, but that's already in the schema.

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 clearly states the tool generates one or more UUIDs and specifies the supported versions (v4 and v7). This is a specific verb and resource that distinguishes it from siblings like 'timestamp' which generates timestamps, and 'health' which likely checks system status.

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 when to use this tool (when UUIDs are needed) but does not explicitly state when not to use it or mention alternatives. For example, it doesn't clarify if 'text.structure' could be relevant for UUID formatting. It provides no guidance on version selection beyond naming them.

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