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

No annotations exist, so the description carries the load, and it does disclose non-obvious traits: prices already include insurance and VAT, amounts marked *_quoted are currency-dependent, and the agent must not perform conversions itself. It leaves return shape and whether data is cached/live unstated, which keeps it short of a 5.

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 purpose and the 'no dates' scope come first, then the content breakdown, then the currency rule and the sibling redirect. Dense but no sentence is redundant.

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 must convey return values — it does, listing rate ranges, tier structure, add-on pricing, and location fees, plus the VAT/insurance inclusion. That is everything needed to call and interpret this tool.

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% and each enum parameter is documented in the schema, including the default-language heuristic, so the baseline is 3. The description adds only the 'never convert yourself' constraint on currency, largely restating what the schema already says.

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?

Names a specific resource (current price list) and enumerates exactly what it contains: daily rate ranges per category and rental-length tier, add-on prices per day, and one-time location fees. It also explicitly excludes date-based pricing, which separates it from check_car_availability.

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?

States the select/no-select condition plainly ('without dates') and names the alternative with its trigger: 'For the total price of a specific window use check_car_availability instead.' An agent can route between the two without opening either schema.

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