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

Since no annotations are provided, the description carries the full burden. It discloses important behavioral traits: idempotency, owner-scoping, no money movement, and strict requirements for identity and terminal. This goes beyond the basic action and provides meaningful context for an AI agent.

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 two concise sentences, front-loaded with the primary action. It packs significant behavioral information without redundancy, wasting no words.

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 simple single-parameter cancel operation, the description covers the action, key consequences (idempotent, no money), and prerequisites. It lacks details on return values or error handling, but given the simplicity and no output schema, it is reasonably complete.

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?

The input schema already provides full coverage of the single 'id' parameter with 'The cart id.' The description adds no additional detail about the parameter itself, so it neither enhances nor conflicts with the schema. Baseline 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 states the action 'Cancel a cart' with a specific resource, distinguishing it from sibling tools like cancel_checkout. It also adds scope qualifiers (owner-scoped, no money moved) that clarify its purpose.

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 implies usage for cart cancellation but does not explicitly differentiate from alternatives like cancel_checkout or state when not to use it. It provides context about requirements (identity, Idempotency-Key, signature-required Terminal) which helps an agent determine feasibility.

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