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

Annotations already declare readOnlyHint/idempotentHint/OpenWorld behavior, so the bar is lower. The description adds real value by clarifying the payload is a signed 'ping' and the returned observable is the HTTP status, and by dispelling the assumption that it triggers real event delivery.

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 compact sentences with no filler; the action and its scope are front-loaded and the limitation is appended efficiently.

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?

An output schema exists, so return values need not be spelled out, and the description still names the returned signal (HTTP status). For a single-parameter probe tool this is complete.

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?

Only one parameter, and the schema documents it at 100% coverage, including its source ('from list_webhook_endpoints'). The description adds no meaning beyond that, 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?

States a specific verb (send a signed 'ping' event) plus resource (webhook endpoint) and the observable outcome (report HTTP status). It is easily distinguished from siblings like create/update/delete/list_webhook_endpoints, and explicitly rules out real event delivery.

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 when-to-use condition: checking a receiver end to end, with the exclusion that it does not deliver real events. It does not name an explicit alternative tool, but the use case and non-use case are both stated, which is strong guidance.

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