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

Annotations already declare readOnlyHint, idempotentHint, destructiveHint=false and openWorldHint=false, so the safety profile is covered. The description contributes the `full_access` auth requirement, which is genuine added context, but omits error behavior (e.g., not-found handling) and whether the full webhook object is returned for a tool with no output schema.

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 sentences, no padding, with the auth and endpoint facts front-loaded after the purpose statement. The first sentence largely restates the tool name/title, so it does not fully earn its place, but the total length is appropriate.

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 single-resource read tool with one parameter and no output schema, the definition covers identity, auth, and endpoint. It still leaves an agent without the id format/derivation and without any expectation of the payload or failure mode, which are relevant given the absent output schema.

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 0% and the single `id` parameter has no description in the schema, so the description must carry the burden. The path template `GET /webhooks/{id}` indirectly indicates that `id` identifies the webhook, but it never says the value is the webhook's UUID or how to obtain it, leaving the gap only partially closed.

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 states a specific verb and resource ('Retrieve a webhook') and reinforces it with the concrete API path `GET /webhooks/{id}` and operationId, making the scope (single webhook fetched by id, versus list_webhooks or delete_webhook) unambiguous. It does not explicitly name a sibling to route away from, which caps it below 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 required `full_access` API key is a useful precondition, but the description never states when to prefer this over list_webhooks or get_* alternatives, nor what happens when the id is unknown. Usage is implied by the singular resource + id pattern rather than explained.

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