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

Annotations already mark idempotentHint=true and destructiveHint=false; the description adds the immediate effect, the absence of a paused state, and the explicit non-error behavior for unregistered watches. These are useful behavioral details beyond the annotations, though pricing information is peripheral to behavior.

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 core behavior is front-loaded in the first sentence and the whole description is compact. The pricing sentence is useful for cost awareness but the 'INFLUENCE' prefix and trailing price link are slightly extraneous.

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-required-parameter, idempotent mutation tool, the description covers what happens, the error semantics, and cost. It does not specify the response/return shape, but with no output schema and a simple effect this is a minor gap.

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 50%: context is well documented in the schema, but slug has no description. The tool description implies slug identifies a listing, but it does not explain the slug format or how to obtain it. The description adds only modest meaning beyond the schema.

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 opens with a specific verb phrase, 'stop watching a listing,' identifying the exact resource and action. This clearly distinguishes it from the inverse sibling watch_listing and from related list-management tools, so an agent can select it without ambiguity.

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 gives clear use context: call this when a watch should be removed immediately, and it clarifies that there is no paused intermediate state. It does not name alternatives or state when not to use it, which keeps it just short of a 5.

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