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

Annotations already declare readOnlyHint, idempotentHint, openWorldHint=false and destructiveHint=false, so safety and repeatability are covered. The description adds only that the call happens in an authenticated hook, and says nothing about what a failed verification means, error behavior, or the token/receipt trust model — thin for a verification routine.

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?

A single short sentence with no filler and the action front-loaded, which is structurally fine. However, its brevity reflects under-specification rather than disciplined concision, since key behavior is simply absent.

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 four mandatory parameters, nested object inputs, no output schema, and no annotations about return values, the description is far too sparse. An agent cannot know what a successful verification returns or what failure looks like, which is exactly what this tool's caller needs.

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?

Four required parameters with 0% schema description coverage, including two opaque nested objects (event, receipt), and the description supplies no parameter meaning beyond loosely implying 'hook' and 'receipt'. The regex-constrained hookId and token formats are undocumented anywhere except a bare pattern, so the description does not compensate for the coverage gap.

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 verb+resource ('verify a relay receipt'), which is better than tautology, but 'within your authenticated hook' is vague scoping rather than a clear statement of what is verified or against what. It also fails to differentiate from the sibling verify_destination or accept_hook_event, so an agent cannot route confidently from the description alone.

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?

No when-to-use, when-not-to-use, or alternative routing is provided. The phrase 'within your authenticated hook' is implied context, not guidance, and nothing tells the agent how this differs from the other verify/get hooks in the sibling list.

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