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

With no annotations, the description carries the full burden, and it does disclose one meaningful trait beyond the schema: the operation is paid ($0.005/check via x402), warning the agent about billing. However, it says nothing about what 'verify' entails, what a passing vs. failing verification returns, or what errors look like.

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 compact sentence with the core purpose front-loaded and no filler. Its brevity reflects underspecification rather than verbosity, so it earns credit for structure but not a top score.

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 two-required-parameter tool with a nested object, 0% schema coverage, and no output schema, the description is far too thin. An agent cannot tell what a valid receipt/payload pair looks like or how to interpret the verification result.

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 0%, and the description does not explain what 'receipt' (a nested object) or 'payload' (a string) should contain, nor how they relate. 'Signed entry receipt' hints at the receipt's nature but leaves both required parameters effectively undocumented.

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 and resource ('Verify a signed entry receipt'), which an agent can act on. It does not explicitly differentiate itself from the siblings (customs_cross, customs_file, customs_status), though the naming is distinct enough that confusion is unlikely.

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 indication of when to use this versus the sibling tools, no prerequisites, and no exclusions. The only usage-adjacent detail is the per-check cost, which tells the agent it is a billable operation but not 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.