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

No annotations exist, so the description carries the burden. It adds 'Unmetered,' a useful behavioral detail beyond the schema. However, it does not disclose whether the operation is idempotent, what happens if the URL isn't watched, or any side effects, leaving some transparency gaps.

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 sentences, front-loaded with the primary purpose, and includes only necessary extra details ('Unmetered'). No word is wasted.

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 single-parameter tool with no output schema, the description covers purpose, parameter guidance, and pricing behavior. It lacks error-case details, but these are not critical given the tool's simplicity and the schema's full coverage.

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 already provides a clear description of the url parameter (100% coverage). The description adds valuable context by specifying that the same URL as watch_site should be used, which clarifies the expected value beyond the schema's generic wording.

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 starts with 'Stop watching a site's design score,' which clearly states the verb and resource. It directly contrasts with the sibling tool watch_site, making its purpose unambiguous.

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?

It instructs to pass the same URL given to watch_site, establishing a clear usage context and connection to the companion tool. It lacks explicit exclusion criteria but is sufficient for a simple inverse operation.

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