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

Annotations already declare readOnly, idempotent, non-destructive, so safety profile is covered. The description usefully adds pricing semantics (return day free, minimum, Friday-to-Monday, weekly) and the shareable URL, but omits any rate-limit or freshness/persistence caveat.

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 the core purpose and pricing rules, then the output/checkout note. Efficient and no redundant text.

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?

Read-only estimation tool with full schema coverage and rich annotations; the description adds pricing rules and the output artifact (shareable URL) plus the funnel boundary (final checkout on Gearbooker), making it largely self-contained for correct invocation.

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 baseline is 3. The description adds no parameter-level detail (e.g., that slug must come from list_equipment, or locale behavior) beyond what the schema already documents.

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?

Clearly states a specific verb (estimate) and resource (rental, Gearbooker fee, total), distinguishing it from quote_kit (a kit variant) and start_booking (the actual checkout). It doesn't explicitly name those siblings, so it falls short of a 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?

Implies usage as an estimation step ending in a shareable quote URL with final checkout on Gearbooker, but never states when to use this versus check_availability or quote_kit, and offers no exclusions or prerequisites.

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