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

Annotations already establish that this is a read-only, idempotent, non-destructive operation. The description adds substantial behavioral context beyond annotations: the returned fields, the limit of up to 20 upcoming days, booking redirect behavior, and required attribution for MotorsportReg.com data.

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 front-loaded with what the tool returns, then moves into policy and attribution guidance. It is dense but mostly earns its length, since the booking and attribution details affect how the agent should present the result.

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 no output schema, the description must explain return contents, and it does so clearly: circuit details, organisers, and upcoming days. It also covers the important downstream behavior around booking and attribution, leaving little needed for correct invocation and presentation.

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 the id parameter is fully documented with an example and a name-based fallback. The description does not add meaning beyond the schema for the single parameter, so the baseline score of 3 is appropriate.

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 identifies the resource and scope: one circuit with location, length, turns, organisers, and next upcoming days. This distinguishes it from list_circuits by focusing on a single circuit, though it does not explicitly name sibling alternatives.

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 important post-retrieval guidance about booking through the organiser and checking details there, plus attribution requirements. However, it does not explicitly state when to use this tool versus list_circuits, find_track_days, or get_event, leaving selection guidance mostly implied by the name and schema.

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