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

Beyond annotations, it discloses the required permission (webhook.manage), the authorization model (tenant/agent/Live-Sandbox, same as the REST endpoint), and the critical async caveat that queue admission is not HTTP delivery. It also states the uncertain-mutation retry rule for idempotency_key, which is exactly the behavioral context an agent needs for a mutating, idempotent tool.

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?

It is dense but front-loads the core action and caveats first, then auth, then idempotency, then the docs link. Every sentence carries information, though the phrasing is compact enough that it reads more like a bulwark of constraints than a clean flow.

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?

With an output schema present, return values need no explanation, and the description covers the remaining essentials: what it does, the async boundary, permissions, authorization scope, and retry semantics. Nothing required to invoke it correctly is missing.

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%, so all three parameters are already documented in the schema, including the idempotency_key retry semantics and expected_revision concurrency rationale. The description's idempotency guidance is largely redundant with the schema, so the 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?

It names a specific verb and resource ('Queue a synthetic webhook.test delivery') and scopes it ('no item'), which distinguishes it from the sibling test_webhook_endpoint_with_sample. It also explicitly contrasts the action with the sibling list_webhook_deliveries, so an agent can tell the tools apart without opening schemas.

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 states the use case (check the receiver and its signature verification) and routes the agent to list_webhook_deliveries for actual HTTP delivery status, which is an explicit alternative. The implicit contrast with test_webhook_endpoint_with_sample ('no item') is useful but not spelled out by name, so it falls just short of fully explicit when/when-not guidance.

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