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

Annotations already indicate readOnlyHint=false, idempotentHint=false, and destructiveHint=false, so the description doesn't need to restate those. It adds useful behavioral context: the event is signed, synthetic, and the tool reports the receiver's HTTP status. It also discloses the permission requirement (owner/admin), which is valuable beyond the annotations.

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?

The description is a single, dense sentence that front-loads the action, includes the payload example, and ends with the permission requirement. Every clause earns its place; no filler 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 single-parameter tool with a full output schema and clear annotations, the description is nearly complete. It covers the action, payload, permission, and outcome. The only minor gap is not describing what happens on failure (e.g., non-2xx status), but the output schema likely covers that.

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 100%, so the schema already documents webhookId well. The description adds context by explaining the webhookId is for a registered webhook and that the event is sent to it, but it doesn't need to add more since there's only one parameter and the schema covers it fully.

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 clearly states the action (POST a signed synthetic event), the resource (a registered webhook), and the expected outcome (report the receiver's HTTP status). It also includes the event payload shape and permission requirement, making it unambiguous and distinguishable from sibling webhook tools like webhooks_set or webhooks_delete.

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 description implies when to use this tool: to test a registered webhook by sending a synthetic event. It doesn't explicitly name alternatives or exclusions, but the sibling context (webhooks_set, webhooks_list, webhooks_delete) makes the use case clear. A brief 'use this to verify a webhook endpoint' would have made it fully explicit.

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