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

Annotations already provide destructiveHint=true, so the agent knows this is a destructive operation. The description adds the core action of 'cancel' but does not clarify whether this is a hard delete or a reversible change, nor does it mention consequences like irreversibility. It does not contradict the annotations, but it adds minimal extra behavioral context.

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 a single, concise sentence with no wasted words. It is front-loaded with the verb and resource. It is appropriately sized for a simple tool, though it could have included more usage context without becoming bloated.

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 destructive tool with no output schema, the description is minimal. It does not cover return values, error conditions, or prerequisites, and it does not distinguish this tool from the sibling 'events_free'. Given the simplicity of one parameter, some of these gaps are acceptable, but the lack of differentiation and behavioral consequences makes the description incomplete.

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 schema fully documents the 'id' parameter as 'The event's id, as given by events_list'. The description only repeats 'by id' without adding additional meaning, so it provides no value beyond the schema. Baseline 3 is appropriate due to full schema coverage.

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 'Cancel an event by id' clearly states a specific action (cancel) on a specific resource (event) with a specific identifier (id). It is not a tautology and is understandable, though it does not explicitly distinguish itself from the sibling tool 'events_free', which could also imply cancellation.

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 no guidance on when to use this tool versus alternatives. There is no mention of exclusions, prerequisites, or a comparison with similar tools like events_free or events_create. The context signal of sibling tools is present, but the description itself provides no usage direction.

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