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

With no annotations, the description does real work: it discloses that a live signed HTTP request egresses to the user's URL, that only one delivery is sent, and that the caller sees the endpoint's response. It omits whether failures affect webhook health status, what auth the api_key provides, and whether retries occur.

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 filler; the action and its observable result are front-loaded before the endpoint equivalence.

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, so the 'read what your URL answered' clause suffices for return values. But for an unannotated tool that makes an outbound network call, the missing auth/permission and side-effect detail leaves a meaningful gap.

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% across 2 parameters. The endpoint path references webhook_id, giving indirect meaning, but api_key is never mentioned anywhere, leaving the required auth parameter completely unexplained.

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 one signed test delivery') plus the exact REST equivalent, which pins down scope unambiguously. It is clearly distinguishable from siblings like create_webhook, list_webhooks, and webhook_deliveries.

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 phrase 'test delivery now' implies a one-off verification use case, and 'same as POST /v1/webhooks/{webhook_id}/test' anchors it. However, it never explicitly says when to prefer this over webhook_deliveries (history) or what preconditions apply, leaving the agent to infer the routing.

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