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

With no annotations, the description carries the full burden and does add real behavioral context: the tool is free, it does not spend money, and it returns a recommendation plus exact price. It does not explicitly confirm read-only/no-side-effects status, auth needs, or whether the quoted price expires, so it is useful but not exhaustive.

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 short sentences, front-loaded with the tool's identity ('Free pricing/router tool') and then the input/output contract. Nothing is padded or repeated.

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 two-parameter, no-output-schema router, the description covers what it takes, what it returns, and that it costs nothing. A note on whether the recommendation is binding or the price time-limited would make it complete, but nothing essential is missing.

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 100% and both parameters are documented, including the remediation-vs-audit enum semantics. The description merely restates 'number of products' and 'remediation or audit,' adding no meaning beyond the schema, so the baseline 3 applies.

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: it is a 'pricing/router tool' that 'returns the best paid route and exact price.' That cleanly distinguishes it from the executor siblings (catalog_remediation, catalog_audit), which perform the work this tool only quotes. It stops short of naming any sibling explicitly, so it lands at 4 rather than 5.

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?

'before you spend anything' implies the right moment to call it (prior to committing to a paid tool) but never names the alternative tools or states exclusions. Usage is inferred from the pricing/pre-purchase framing rather than spelled out.

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