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

Annotations already mark the operation destructive and idempotent; the description adds a concrete consequence beyond that: 'Remaining checks are forfeited.' This tells the agent what is lost on invocation, though it does not mention response behavior or post-stop state.

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 short sentences convey purpose and consequence with no filler. The main action is front-loaded and the additional side-effect sentence earns its place.

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 one-parameter, no-output-schema tool, the description is nearly complete: it states the operation, the parameter's role, and the key side effect. It would be more complete with an explicit pointer to watch_url as the source of the token or a note on when stopping is appropriate, but annotations cover idempotency and destructiveness.

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 schema gives only 'token' as a required string with no description (0% coverage). The description identifies token as the monitor identifier ('Stop a monitor by token'), which is the essential meaning, but it does not explain token format or where to obtain it.

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 opens with a specific action and resource: 'Stop a monitor by token.' The title 'Stop watching a page' reinforces this, and the operation is clearly the inverse of the sibling watch_url, making it easy to distinguish.

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 clear context for when to use the tool: when a monitor should be stopped. It does not explicitly name alternatives or exclusions, but the action is unambiguous and the sibling tools naturally suggest the related start/check operations.

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