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

With no annotations, the description carries the burden of disclosing behavior. It only states the basic function without detailing error handling, side effects, or return format. There is no contradiction, but the disclosure is minimal.

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?

Extremely concise: one sentence that front-loads the action and outputs. No unnecessary words, it earns its place.

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 parsing tool with one parameter and no output schema, the description provides the core idea but lacks completeness: it doesn't describe the return structure (e.g., object fields) or give an example. It is adequate but has clear gaps.

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 only parameter 'uuid' is described as a 'UUID string', which barely adds meaning beyond the schema's type. The description focuses more on outputs than the parameter's format or constraints (e.g., expected format), and schema coverage is 0%, so the description should compensate more.

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 action (Parse), the resource (UUID string), and the specific outputs (version, variant, hex bytes). It distinguishes from sibling tools like uuid_generate which creates UUIDs.

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?

No guidance on when to use this tool versus alternatives, no prerequisites (e.g., valid UUID format), and no mention of when not to use it. Given the large sibling list, such guidance would be helpful.

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