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

With no annotations, the description carries the full burden and does disclose key traits: the call is synchronous, the payload is signed, and the event is a test rather than a real one, so the agent knows it is a safe-ish diagnostic. It leaves important behavior unstated — whether a failed test mutates webhook state (failure counters, auto-disable), what happens on receiver timeout, and whether auth/permissions are required.

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?

A single front-loaded sentence with the core action first, then the purpose clause. No wasted words or redundancy.

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?

For a one-parameter, no-output-schema diagnostic tool the description covers what it does and what it returns at a high level (the receiver's response). The remaining gap is failure-mode behavior, which matters for a tool whose entire point is surfacing failures.

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 0% and the single required parameter webhook_id is never mentioned in the description, so no meaning is added beyond the schema. The name is largely self-explanatory, which keeps this at minimum-viable rather than failing.

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 synchronous signed test event to a webhook') plus the outcome ('report the receiver's response'), which cleanly separates it from create_webhook, get_webhook, list_webhooks and delete_webhook. An agent can identify the operation without opening the 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 a clear usage context — verify endpoint and HMAC handling before relying on real events — which tells the agent this is a pre-flight check, not a delivery mechanism. It stops short of explicit exclusions or naming alternatives for inspecting an existing webhook's config.

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