verify_facebook_webhook

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

No annotations are provided, so the description carries the full burden. It discloses that the tool verifies a subscription and returns the challenge URL, which is useful, but it does not mention potential side effects, authentication requirements, or any HTTP/network behavior. The core action is clear, yet the behavioral profile is incomplete.

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?

Two compact clauses convey the purpose, the protocol context, and the return value without wasted words. The key operational information is front-loaded.

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 zero-parameter tool with an output schema, the description is sufficiently complete. It explains what the tool does, when it is used (registration), and what it returns, so an agent can select and invoke it correctly without additional documentation.

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 tool has zero parameters, so the baseline is 4. The description does not need to explain parameter semantics, and the empty schema already covers the parameter surface completely.

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 uses a specific verb ('Verify'), names the exact resource ('Facebook webhook subscription'), and mentions the handshake fields (hub.mode/hub.verify_token/hub.challenge) plus the return value. This clearly distinguishes it from sibling registration and simulation tools.

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 phrase 'as Meta does on registration' gives clear usage context: this is the verification step in the Facebook webhook registration flow. It does not explicitly list alternatives or exclusions, but the context is strong enough for an agent to infer when to invoke it.

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