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

No annotations are provided, so the description carries the full behavioral burden. It usefully discloses the return contents (ID, pattern, URL), but it never states whether the operation is read-only, side-effect-free, or requires any auth. An agent must infer the safety profile from the word 'list'.

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 short sentences with zero filler. The purpose is front-loaded, and the Returns line earns its place by specifying the exact fields an agent should expect (ID, patrón, URL).

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 zero-parameter read-only listing tool with an output schema present (per context signals), the description covers purpose and return value and is largely complete. The only genuine gap is lack of sibling differentiation, which is already penalized under usage_guidelines.

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 tool has zero parameters and an empty schema, so the baseline is 4. There is nothing for the description to add beyond the schema; it correctly describes the operation rather than parameters, and there is no parameter documentation gap to compensate for.

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 and resource: 'Lista todos los webhooks registrados' (Lists all registered webhooks), and adds the return shape (ID, patrón, URL). It is reasonably distinguishable from the look-alike sibling list_watch_dirs via the 'webhooks' resource, though the description never explicitly differentiates them and mixes terminology ('webhooks' vs 'watches').

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, and no exclusions or prerequisites. With a sibling set of 36 tools including the similarly named list_watch_dirs, an agent is left to infer selection criteria from the name and one-liner alone.

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