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

With no annotations, the description carries the full burden, but it does add useful behavior: the $0.001 x402/USDC pricing, the free-quote option, and provenance chain plus Ed25519 attestation in the response. It omits error behavior, auth requirements beyond payment, and what happens when a recall number is not found.

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 sentences, front-loaded with purpose then payment/attestation detail. No filler, though the pricing sentence serves a mixed purpose of billing and transparency.

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?

There is no output schema, so the description correctly enumerates the returned fields (classification, reason, distribution, firm, status) plus the attestation. Payment cost is covered. Error/empty-result behavior is the only notable omission.

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 only 50% – the required 'id' parameter has no schema description at all, only a maxLength. The phrase 'by recall number' usefully clarifies that 'id' is a recall number, partially compensating, while the payment parameter is documented in the schema itself.

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 ('FDA enforcement action by recall number') and enumerates the returned fields, so an agent knows exactly what it retrieves. It does not explicitly distinguish itself from the sibling fda_recall_state_summary, which is the only real gap.

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?

The description implies usage ('by recall number') but never states when to choose this over fda_recall_state_summary or the CPSC recall siblings, nor any prerequisites. No when/when-not guidance is provided.

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