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

Beyond the readOnlyHint annotation, the description adds meaningful behavior: no PII is collected for indicative pricing, unlicensed requests are still registered and yield a quote_id, and the server asks for only the missing facts. These are non-obvious behaviors an agent needs to know and are not present in the schema or annotations.

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 reasonably concise and front-loaded with the core purpose. All four sentences carry useful information, though the unlicensed-agent explanation could be tightened slightly.

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 10 parameters, 20% schema coverage, and no output schema, the description is not fully complete. It does mention the key quote_id outcome and the licensing caveat, but it leaves many parameter meanings and the overall response shape unspecified. It is adequate but has clear gaps.

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 description coverage is only 20%, so the description must compensate for undocumented parameters. It groups inputs as 'rating facts only' and clarifies that PII is not needed, but it does not explain most parameters such as annual_mileage, violations_3yr, years_licensed, or prior_continuous. The server-asks-for-missing-facts note does not help an agent supply correct values up front.

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 clearly states the tool returns indicative auto insurance prices from multiple carriers, with a licensing condition. This is a specific verb+resource, but it does not explicitly differentiate from siblings like market_data or check_eligibility, so it misses the highest bar.

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 gives clear usage context: it takes rating facts only, does not require PII, and handles unlicensed situations by returning a quote_id for licensed agents. However, it does not name alternative tools or state when not to use this one, so exclusion guidance is implied rather than explicit.

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