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

Goes well beyond the annotations by disclosing a real side effect not captured anywhere structured: a successful ping re-enables a disabled hook. It also documents the auth requirement (API Light/Pro/internal key via 'Authorization: Bearer <key>') and the failure mode for trial keys (403), which the openWorldHint/idempotentHint flags do not convey.

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?

Front-loaded with the action and effect, followed by side effect, auth, and a short disclaimer. Every sentence is doing work, though the trailing legal disclaimer is boilerplate rather than operational guidance.

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 tool with no output schema, the description covers the action, the side effect, the auth/prerequisite requirements, and what is returned ('report the receiver's HTTP status'). An agent has everything needed to invoke 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 description coverage is 0% for the single required 'id' parameter, so the description must compensate and only partially does: 'one of your hooks' implies the id selects a registered webhook, but it never states that explicitly or gives the identifier's form. It adds context but leaves the parameter's exact meaning to inference.

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 test.ping event to one of your hooks') with the effect ('report the receiver's HTTP status'). This is clearly distinguishable from siblings like register_alert_webhook, list_alert_webhooks, and delete_alert_webhook without opening any 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 clear context for use — testing a hook now, and the notable condition that a successful ping re-enables a disabled hook, which tells the agent when this tool matters. It does not explicitly name alternatives or state when not to use it, so it falls 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.