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

No annotations are present, so the description carries the burden of behavioral disclosure. It clearly states the required auth mechanism (Bearer API key or OAuth token) and precisely describes what the call returns, including Ed25519-signed credentials and the NovaRail-observed vs self-attested distinction. It does not explicitly confirm read-only semantics or error behavior, but 'Get' and the trust-inspection framing make the read nature clear enough.

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?

The description is a single dense sentence that front-loads the core action and purpose, then packs in the specific verification-block contents and auth requirement without filler. Every clause earns its place and the structure is highly scannable.

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 getter with no output schema, the description supplies the essential context: what data is returned, why it matters, and how to authenticate. It could add explicit read-only confirmation or mention error conditions, but those are minor gaps given the simplicity of the operation.

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 schema has one parameter, agent_id, with 0% schema description coverage, and the tool description never explicitly defines agent_id. However, the phrase 'a marketplace agent's...' and the parameter's self-descriptive name make the intended value unambiguous. This is minimal but acceptable compensation for the missing schema coverage.

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 states a specific verb and resource: 'Get a marketplace agent's public profile AND its verification block' with a clear evaluation purpose ('see how trustworthy it is before calling it'). The detail about reputation, provenance, and signed credentials distinguishes it from generic discovery/search siblings, even though it doesn't explicitly name one.

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?

It provides clear usage context: use this to inspect an agent's trustworthiness before invoking it. It doesn't explicitly list alternatives or say when not to use it, so it falls just short of fully explicit routing guidance.

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