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

The annotations already declare this is a non-read-only, non-destructive operation. The description adds useful behavioral context by clarifying that existing alerts remain in the log after the watch is stopped, though the lapsed-member sentence is unclear and retry/idempotency behavior is left to the schema.

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 short and front-loads the action and resource. However, the final fragment, "A lapsed member may too," is ambiguous and weakens clarity without clearly earning 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?

This is a low-complexity, two-parameter tool with full schema coverage, annotations, and an output schema. The description covers purpose and the key retention behavior, though the eligibility note is vague and there are no explicit exclusions.

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 100%, so both parameters are already documented. The description only reinforces that the ID comes from problee_list_watches and adds no additional meaning for the idempotencyKey beyond what the schema provides.

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, "Stop," and a specific resource, "watch," and states it acts by ID. Referencing problee_list_watches for the ID also distinguishes it from the sibling list and create watch tools.

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 clearly tells the agent to obtain the watch ID from problee_list_watches, which implies the correct usage context. It does not explicitly state when not to use it or name alternatives beyond the ID source, and the final sentence about a lapsed member is ambiguous.

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