twitter_monitor_webhook_create

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

It discloses critical behavior well beyond the annotations: the HMAC signing secret is returned only once, must be stored immediately, cannot be retrieved again, and is used to verify the X-TwitterAPIs-Signature header on every delivery. It also notes that IP restrictions are re-checked at every delivery, not just at registration.

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 two sentences and every sentence earns its place: the first states the purpose, the second delivers the crucial secret-handling and signature-verification warning. No filler or repetition.

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 creation tool with no output schema, the description covers purpose, side effects, secret handling, signature verification, URL validation, and cost. It could more explicitly describe the full response shape or mention limits, but the essential operational information is present.

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?

The input schema already provides 100% coverage for the url parameter, including constraints on private, loopback, link-local, and metadata IPs. The tool description itself adds no additional parameter-level meaning, so the baseline of 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?

The description opens with a specific verb and resource: 'Register an HTTPS endpoint to receive signed monitor events.' This clearly distinguishes it from sibling tools like twitter_monitor_webhook_list, twitter_monitor_webhook_delete, and twitter_monitor_webhook_test.

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 clearly states the use case: registering an HTTPS endpoint to receive signed monitor events, and adds the cost note 'Free per call.' However, it does not explicitly contrast with the list/delete/test siblings or mention when not to use it, so it falls short of full alternative guidance.

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