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

Annotations already declare readOnly=false, openWorld=true, idempotent=false, destructive=false. Beyond that, the description adds two genuinely useful facts the annotations do not convey: it is rate limited to 5 per minute, and it returns the target's response so the agent knows to inspect the result. It stops short of saying what a failed delivery looks like or whether the event is recorded in event history.

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 core action front-loaded and the operational constraint (rate limit) appended. Nothing could be removed without losing information.

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 two-parameter, fully-described-schema tool with no output schema, the description covers purpose, rate limit, and that a response is returned. Only failure/error semantics and whether the test event appears in event logs are missing, which are secondary for a testing tool.

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 both 'id' (wh_xxx) and 'type' (full enum plus w:/c: patterns) are already fully documented. The description only restates 'event type' and implies the webhook URL comes from the id, adding no new parameter-level semantics. 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 (send), a specific resource (a sample event of the given type to the webhook URL), and adds that the response is returned. This is clear enough to distinguish it from create-webhook/update-webhook/get-webhook, though it never names the closest alternatives (send-event, retry-webhook-request) explicitly.

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 'sample event' implies this is for testing rather than real delivery, and the rate limit hints at appropriate use, but there is no explicit when-to-use/when-not or named alternative such as send-event for genuine events. Usage is left to inference.

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