close_watch

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

With no annotations, the description carries the behavioral burden. It usefully discloses idempotency and the caller-scope restriction, but it does not describe side effects, identity requirements, error behavior, or what closing actually entails beyond the obvious mutation.

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 front-loaded, efficient sentence. Every word earns its place, and the idempotency caveat is neatly parenthesized without disrupting readability.

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 two-parameter tool, the description plus schema is basically callable, but it lacks important context about shared-connection identity and does not state effects, errors, or return behavior. The relevant siblings like plan_session and join_session make the identity question non-trivial.

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 only 50%, with watch_id lacking a description, and the tool description adds no parameter-level meaning. It does not explain how watch_id is obtained or when binding_token is needed, so it fails to compensate for the schema gap.

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 uses a specific verb ('Close') and a clear resource ('the caller's own watch registration'), making the operation unambiguous. It also adds distinguishing scope ('caller's own') and behavior ('idempotent'), which helps separate it from sibling tools like register_watch.

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?

No when-to-use guidance is provided, and no alternatives or exclusions are mentioned. 'Caller's own' conveys scope but not the conditions under which an agent should choose this tool over siblings like register_watch.

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