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

Annotations already declare destructiveHint=true and idempotentHint=true, but the description adds the concrete consequence the annotations only hint at: the watch's history is deleted, not just the watch itself. That is meaningful added context for a destructive call. It does not state whether the history deletion is permanent or what error occurs for an unknown watch_id, so it stops short of a 5.

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?

A single front-loaded sentence with no filler; the destructive side effect is stated in the same clause rather than buried.

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 tool with no output schema and annotations covering safety and idempotency, the description covers purpose, origin of the id, and the key side effect. Missing only edge-case behavior such as invalid or already-removed watch_ids.

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 0% for the single watch_id parameter, so the schema adds nothing. The description partially compensates by indicating the id refers to a watch created via watch_page, but gives no format, source, or example of the identifier.

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?

States a specific verb (stop) and resource (a watch) and ties it explicitly to the sibling that creates watches (watch_page), so the agent can place it in the watch lifecycle. It does not explicitly distinguish from get_watch, though the 'stop' verb makes the read/write split inferable.

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?

Usage is implied by 'a watch created with watch_page' — call this to tear down an existing watch. There is no explicit when-not-to-use guidance (e.g., that a watch_id must already exist or that the watch is already stopped), so the agent must infer the precondition.

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