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

Annotations already declare readOnlyHint=true, destructiveHint=false and openWorldHint=false, so the safety profile is covered. The description adds only the cost note ('Free:') and no behavioral context such as what a failed verification means, whether verification depends on external state (idempotentHint=false is unexplained), or what the caller receives. With annotations carrying the safety burden, this is a below-average supplement.

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 the cost qualifier front-loaded and no filler. Nothing in it is redundant or wasteful.

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 verification tool with a fully described schema, the definition is barely adequate: with no output schema, the description should explain what verification returns (valid/invalid, failure reasons), which it omits. The schema itself is clear about input shape, which partially compensates.

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?

There is a single parameter and schema description coverage is 100%, so the schema already explains that the record must be one exactly as delivered with its receipt included. The description adds nothing about the parameter. Baseline 3 applies when the schema does all the work.

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 names a specific verb (verify) and a specific resource (the signature and content hash of an agosint answer), so the agent knows exactly what operation is performed. It does not compare itself to any sibling tool, but none of the siblings (company, domain, sanctions, etc.) overlap with verification, so disambiguation is not really at stake.

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?

There is no guidance on when to invoke this tool versus alternatives, nor on prerequisites (e.g. call it after receiving an answer). The only contextual cue is 'Free:', which hints at cost rather than usage conditions.

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