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

Beyond the annotations, the description discloses that only one KV write occurs when the URL changes and that the signing secret is returned once. It does not explain authentication requirements or what happens to an existing secret when the webhook is replaced or cleared, leaving some behavioral gaps.

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 three tight sentences: purpose first, then write behavior and one-time secret, then a docs link. No sentence is wasted, and the key operational facts are front-loaded.

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 one-parameter tool with full schema coverage and useful annotations, the description covers the main operational facts, including the one-time secret return. It could be more complete about permissions and the effect of overwriting or clearing an existing webhook, but those are minor 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?

Schema coverage is 100%, and the schema already explains that an empty string clears the webhook. The description reinforces the URL's purpose but adds no syntax or format detail beyond the schema, so the baseline 3 applies.

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 gives a specific verb+resource: save or clear the https URL that receives signed message events. That is clearly a webhook configuration tool. It does not explicitly differentiate itself from the sibling test_webhook, so it falls short of a 5.

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 does not state when to use this versus alternatives such as test_webhook, nor does it give prerequisites or exclusions. The 'save or clear' phrasing implies the basic action, but no explicit usage guidance is provided.

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