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

Beyond annotations, the description discloses key behavior: deliveries are signed and carry the same parameters as real deliveries, each webhook is rate-limited to one test every 30 seconds, and the tool returns an event ID. This gives an agent substantial operational context.

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?

Three tightly written sentences, front-loaded with the action and followed by rate-limit and return/status guidance. No sentence is redundant.

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 annotations, one fully documented parameter, and the presence of an output schema, the description supplies all remaining context an agent needs: what is sent, how it is signed, the rate limit, and how to check delivery status.

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% for the single webhook_id parameter, so the schema already explains the parameter. The description adds only that the target webhook must be enabled and that its endpoint receives the delivery, which is useful but modest beyond the schema.

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: sending a webhook_test delivery to an enabled webhook's endpoint. It distinguishes the test event from normal deliveries and names the sibling get_webhook_event for checking status.

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 clearly indicates this is for test deliveries and points to get_webhook_event for status checks. It could more explicitly say when to use this versus other webhook tools or when not to use it, but the test-event context is clear.

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