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

With no annotations, the description carries the behavioral burden and does add real operational context: per-call cost ($0.001), payment rail (x402 USDC on Base), and that responses include a provenance chain and Ed25519 attestation. However, it omits error behavior, what happens for an invalid title, and payment failure handling.

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?

Two tight sentences with no filler, front-loading the purpose before the commercial/response details. Well-sized for the schema complexity.

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 and no annotations, the description does list what the response contains (dates, provenance, attestation) and the cost model, which is helpful. Still missing id-format specifics and failure modes for a schema where the required parameter is undocumented.

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 50%; the 'id' parameter has no schema description (only maxLength 8). The phrase 'for one CFR title' partially compensates by implying id is a title identifier, but the exact format (numeric title, e.g. '1'–'50', or a name) is left ambiguous.

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 resource (eCFR title status) and the exact data returned (latest amendment date and issue date for one CFR title). The purpose is clear, though it does not explicitly differentiate itself from any sibling tool by name.

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 when-to-use guidance, no prerequisites, and no mention of alternative tools. Usage is only inferable from the purpose statement (checking a CFR title's status), leaving the agent to guess the appropriate context.

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