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

Annotations declare it is not read-only, not idempotent, open-world, non-destructive; the description adds what annotations cannot: that a delivery record is created as a side effect, that the endpoint must be active, and the exact authorization and workspace-claim requirements including a 403 failure mode. That is meaningful context beyond the structured fields.

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 tight sentences, front-loaded with the action and followed by outcome-reading and prerequisites. Every sentence is informative, though the auth/workspace sentence stacks two constraints in slightly compressed 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?

No output schema exists, and the description compensates by routing the agent to list_webhook_deliveries to read the result. Preconditions, failure mode, and side effects are all covered, leaving nothing an agent needs to call this correctly undocumented.

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% and the webhook_id description already explains the UUID source, so the schema carries the load. The description still adds the constraint that the target must be an "active endpoint," implying inactive IDs fail, which is a small but real semantic addition.

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 webhook.test event to an active endpoint") plus the side effect ("record the result as a delivery") and the intent ("check it receives and verifies events"). An agent can distinguish this from sibling tools like verify_webhook_signature or list_webhook_deliveries without opening a schema.

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?

Gives the use case (verify an endpoint receives and verifies events), the explicit follow-up step ("Read the outcome with list_webhook_deliveries"), and hard preconditions — scope-unlimited key or user sign-in, and a claimed workspace with the sandbox-key 403 case called out. This is explicit when/when-not guidance with an alternative named.

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