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

Beyond the annotations, the description explains returned-state semantics such as 'available' versus 'not-yet-projected' and notes that unbuilt readings answer 'cannot-measure'. It also discloses that access is free and requires no key, though it does not describe ordering, result size, or pagination.

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 dense, jargon-heavy run-on that leads with the ambiguous phrase 'configure, unfurl and save free' rather than clearly stating that it lists standard watches. Terms like 'tariff' and 'coordinates' are undefined, and the key operation is buried mid-sentence.

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 zero-parameter read-only list with full annotation coverage, the description adequately explains what the response contains. However, it leaves undefined domain terms and omits practical details such as ordering or whether the list is exhaustive.

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 tool takes zero parameters, so there is no parameter meaning for the description to add. The baseline score of 4 applies because the description need not compensate for any undocumented inputs.

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 identifies the resource as the free 'standard Watches' and describes what each entry contains, including coordinates, reading state, and published terms. It implies a distinction from saved watches via the word 'standard', but does not explicitly name the sibling tool, so differentiation is only implicit.

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?

There is no explicit guidance on when to use this tool versus alternatives such as list_saved_watches, get_watch_feed, or unfurl_watch. 'Free; no key' and the endpoint comparison provide context, but they do not tell an agent which tool to choose for a given task.

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