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

Annotations already declare destructiveHint=true, idempotentHint=true, and readOnlyHint=false, so the mutation profile is covered. The description earns credit by adding the authorization and billing constraints (admin-only, paid plan) that the annotations don't express, though it never says what actually happens to collected data or history.

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?

Three short sentences with the action first, then the identification mechanism, then the gating constraints. Nothing is padded and nothing is 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?

With an output schema present, return values need no explanation, and the description covers action, identification, and permissions for a 3-parameter tool. The one residual gap is that it doesn't clarify whether page_id and url are alternatives or both accepted alongside competitor_id.

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 67% (url is undocumented in the schema), and the description compensates by telling the agent the page can be named 'by page_id or url'. That is real added meaning, since the schema never expresses the either/or identification choice.

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 gives a specific verb and resource ('Stops watching a page') and scopes it to 'a page that someone added on a core competitor', which subtly separates it from remove_competitor in the sibling list. It stops short of explicitly naming the inverse tool, but the operation is unambiguous.

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 states the prerequisites plainly ('Admin only, on a paid plan'), which is exactly the kind of gating an agent needs before calling. It doesn't spell out when-not to use it or point to an alternative, so it falls 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.