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

Annotations already declare destructiveHint=true and readOnlyHint=false, so the mutation profile is known. The description adds a genuinely useful operational fact — the Bearer credit-token auth requirement on the MCP transport — but says nothing about reversibility, idempotency, or error behavior on a bad id.

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?

Two short sentences with the action front-loaded and the auth constraint second. Nothing is wasted, though the docs URL is the only place deeper behavior lives, which slightly shifts burden off the description.

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 destructive tool with no output schema and annotations covering the safety profile, the description covers what it does, how it is keyed, and the auth prerequisite. Missing idempotency/not-found semantics keep it from being fully complete.

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% and the single 'id' string is undocumented in the schema, but the description supplies the one fact that matters: the id identifies the watch to stop. With a trivially simple one-parameter shape, that is adequate but not rich; no format, source, or example of the id is given.

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 and resource ('Stop a webhook watch') plus the keying method ('by id'), which is enough for an agent to distinguish it from watch_create and watch_list. It stops short of explicitly contrasting itself with the sibling list/create tools, so it lands just under a 5.

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: you call this to tear down a previously created watch. There is no statement of when not to use it, no guidance on obtaining the id (e.g. via watch_list), and no note about what happens if the id is unknown or already stopped.

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