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

The annotations already signal openWorldHint=true and readOnlyHint=false, but the description adds genuinely new information: this issues a real outbound HTTP request to the customer's URL, which is the key side-effect an agent needs to weigh. It doesn't say whether the payload is logged, counted against quotas, or what a failure looks like, which keeps it below a 5.

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 short sentences, front-loaded with the action and followed by the safety-relevant side effect and the dry-run escape hatch. Nothing is padded.

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 diagnostic tool with no output schema, the description covers what happens and how to avoid the real request. It could note what payload is sent or what the response roughly contains, but an agent has enough to call it correctly.

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 both parameters are documented in the schema; the dry_run description there largely duplicates the prose in the tool description. webhook_id gets no extra meaning beyond its schema label, so the description adds little over the structured fields.

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?

The description opens with a specific verb and resource: send a sample event payload to a webhook's URL to verify delivery. That is unambiguous against siblings like get_webhook, update_webhook, or toggle_webhook, though it never names an alternative 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?

It gives clear context for use (verify the endpoint receives events) and an inline alternative mode: set dry_run: true to preview the target URL instead of sending. It lacks an explicit statement of when not to use it (e.g., never against production endpoints), so it stops short of a 5.

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