create_webhook

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

With no annotations, the description carries the full burden. It discloses that the tool triggers webhook notifications (a side effect) and crucially explains the two-step human-in-the-loop confirmation process, which is significant behavioral information. However, it does not mention authentication requirements for the tool itself or potential side effects like overwriting existing subscriptions, but for a creation tool, the confirmation flow is the key behavior and is well covered.

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, well-structured, and front-loaded. The first sentence states the core purpose, the second explains the event triggering, and the final paragraph clearly outlines the confirmation flow. No redundant words or irrelevant details.

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?

Given the complexity (14 parameters, 100% schema coverage, and an output schema), the description provides sufficient context for an agent to use the tool correctly. It explains the behavioral trigger, the confirmation requirement, and the purpose of the callback URL. The absence of return-value details is acceptable because the output schema exists. The description is complete for a subscription-creation tool with these structures in place.

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 baseline is 3. The description adds some conceptual context by mentioning the filter criteria (flow type, direction, processing rule, ack status) but does not explain any parameter in greater depth than the schema already does. It repeats the callback URL's purpose but adds no new syntactic or semantic information.

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 ('Subscribe to webhook notifications') and the resource (the Approved Platform), and specifies that the AP will POST event payloads to the callback URL on flow creation/update. This distinguishes it from sibling tools like list_webhooks, update_webhook, and delete_webhook.

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 explains what the tool does and the trigger conditions (flow matches filters), but it does not provide explicit guidance on when to use this tool versus alternatives (e.g., update_webhook for modifying an existing subscription, or list_webhooks to enumerate). No exclusions or comparisons are mentioned, so the usage context remains implied rather than explicit.

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