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

Adds substantial context beyond the annotations: it discloses the outbound GET with the challenge token, the DNS-rebinding re-guard that runs first, that a failed attempt is explicitly not an error but stamps last_failure_at, the strict unknown_field rejection, and that non-owned agents return forbidden. This is exactly the safety/outcome detail an agent needs.

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?

Front-loads the core action and keeps the REST mapping and scoping in the first sentence, with the outcome contract last. It is dense with parentheticals but nearly every clause carries real information; only the 'MCP twin of POST ...' phrasing is slightly redundant with the schema description.

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?

With no output schema, the description supplies the return contract ({state, verified}, last_failure_at on failure) and the error contract (structured unknown_field, forbidden for non-owned agents). Nothing needed to call or interpret the result is missing for a single-parameter tool.

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 coverage is 100% and the agent_id property already explains defaults, ownership, and the forbidden refusal in detail. The description only restates 'optional agent_id selects among YOUR agents', adding essentially no syntax or semantics beyond the schema, so the baseline 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?

States a specific action (re-run the webhook challenge-echo verification) on a specific resource, and immediately anchors it to the REST endpoint it mirrors. It clearly separates itself from webhook_register by framing this as the re-run path for endpoints that were down during the original handshake.

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?

Gives a clear triggering condition ('endpoints that were down when the registration handshake fired') and a follow-up loop ('debug the endpoint, then call again'). It does not explicitly name webhook_register or webhook_delete as the alternatives to avoid, so routing is implied rather than spelled out.

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