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

Annotations already declare readOnlyHint and openWorldHint, so the description adds meaningful context: title-only search scope, returned fields, cost per successful call, x402 payment chains, and that failed calls are not charged. It does not cover rate limits or data freshness, but the payment and failure behavior are valuable.

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 compact and front-loaded: source, search scope, return fields, then pricing. Every sentence carries useful information with no waste.

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 simple two-parameter read-only search with a full input schema, output schema, and safety annotations, the description supplies the key missing context: source, title-only scope, return fields, and payment behavior. Nothing essential for correct invocation is absent.

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 100%, so q and limit are already documented in structured form. The description reinforces the title-only search scope, which is relevant to q, but adds little beyond the schema for limit or parameter behavior.

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: search CPSC product recalls from SaferProducts.gov, restricted to recall titles. It clearly identifies the jurisdiction and source, though it does not explicitly distinguish this from the EU safety-gate sibling.

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 explains that only recall titles are searched, but it gives no explicit when-to-use guidance, exclusions, or comparison to alternatives such as EU Safety Gate RAPEX. The agent must infer usage from the source name.

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