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

Beyond annotations (readOnlyHint=false, openWorldHint=true), the description adds critical behavioral details: the response contains the signing secret shown only once, and the operation requires a two-step confirmation. This is valuable context not captured by annotations. It does not describe side effects like whether old webhooks are invalidated, but the disclosed information is substantial.

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 concise (two sentences) and front-loaded with the primary action. The first sentence states the purpose and key output, and the second explains the confirmation step. Every sentence adds value without 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 tool with 3 parameters, one required, and no output schema, the description covers essential behavior: it explains the two-step confirmation, the one-time secret, and the core action. It does not describe the exact response structure beyond the secret, nor the full set of events (though the schema provides enums). Given the moderate complexity, the description is mostly complete but could benefit from noting what happens on rotation.

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 only 33% (only 'confirm' is described in the schema). The description does not elaborate on 'webhook_url' or 'events', nor does it provide additional semantics for them. The mention of 'configure' and 'two-step' partially reinforces the confirm parameter but adds little beyond the schema. Given the low coverage, the description fails to compensate for the undocumented parameters.

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 tool's purpose: configure or rotate the webhook URL and subscribed events. It uses a specific verb 'configure' with a clear resource, and distinguishes itself from the sibling 'get_webhook_settings' by implying a write operation. The mention of 'Two-step: confirm: true to apply' further clarifies the action.

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 usage context by contrasting 'configure' with the likely read-only sibling 'get_webhook_settings', and explicitly instructs on the two-step confirmation process. However, it does not explicitly state 'use this when you need to change webhook settings' or mention alternatives, so it stops short of full guidance.

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