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

Annotations already declare idempotentHint and destructiveHint, but the description adds specific behaviors: releasing reserved balance, returning 409 CONFLICT on already-terminal jobs, and requiring a configured API key. These are valuable beyond the annotations and do not contradict them.

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 three concise sentences, front-loaded with the core action and purpose. Every sentence adds distinct value (action, idempotency, error case, requirement), with no redundancy or filler.

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 cancel operation, the description covers the key facets: what it does, idempotency, error handling (409), and setup requirement (API key). It does not explain the response format, but since there is no output schema and the tool is straightforward, this is not a significant gap.

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 the parameter transcription_id is described as 'The transcription ID to cancel (UUID).' The description does not add further parameter-level details, but with full schema coverage, the 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) and the resource (in-flight Scriptivox transcription), and adds the side effect of releasing reserved balance. It distinguishes from siblings like transcribe_delete, which handles deletion of completed transcriptions, by specifying 'in-flight'.

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 the tool is for in-flight transcriptions and mentions idempotency and 409 on already-terminal jobs, which gives context on when it's appropriate. However, it does not explicitly state when not to use it or mention alternatives like transcribe_delete or stop_meeting_bot.

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