Send a test webhook event (free)

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

Annotations declare readOnlyHint=false, destructiveHint=false and openWorldHint=true, so the safety profile is partly covered. The description adds genuinely useful context beyond that: the call never spends credits, which an agent cannot infer from annotations. It stops short of disclosing that a real HTTP request is delivered to the customer's endpoint or what payload is sent.

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 waste; the action is front-loaded and the cost caveat follows immediately. Nothing is padded or repeated from the schema.

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?

An output schema exists and both params are documented, so the description needn't explain return values. The remaining gap is what the test event actually contains and whether the endpoint's response affects the result — useful but not blocking.

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% and both parameters are documented in the schema, including the cross-reference to list_webhooks for the id. The description adds no syntax, defaults, or timeout semantics beyond that, so 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?

States a specific verb and resource: 'Send a test event to a registered webhook endpoint.' An agent can distinguish it from create_webhook/update_webhook/delete_webhook, though the description never names those siblings explicitly to reinforce the distinction.

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?

Implied usage is clear — verifying a registered webhook works — but there is no explicit when-to-use rule, no prerequisites (does the webhook need to be enabled?), and no stated alternative such as re-sending a real event.

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