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

The annotations already declare destructiveHint=true and readOnlyHint=false, so the safety profile is covered. The description adds useful behavioral context beyond annotations: the endpoint stops receiving completion events, and the call never spends credits.

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, front-loaded with the action and its effect. The cost note is brief and relevant, with no wasted phrasing.

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 simple two-parameter schema, full schema description coverage, destructive annotations, and the presence of an output schema, the description is largely complete for correct invocation. It could still say more about selecting this tool over update_webhook or test_webhook, but that is a usage-guidance gap rather than a missing operational detail.

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 100%, so both the required 'id' and optional 'timeout_ms' are already documented in the schema. The description adds no parameter-specific meaning, which is acceptable at the baseline for fully covered schemas.

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: 'Delete a registered webhook,' and adds the consequence that the endpoint stops receiving completion events. It is clearly distinct from most siblings, but it does not explicitly differentiate itself from related webhook tools such as update_webhook or test_webhook.

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?

It does not say when to use this tool versus alternatives like update_webhook or test_webhook, nor does it mention prerequisites or exclusions. The action is implied by 'Delete,' but no real routing guidance is provided.

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