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

Annotations declare a destructive mutation, and the description adds concrete side effects: check_now timing and baseline status, pause/resume agent behavior, stop permanence and retained findings, and fresh first read on page update. These details are value-add beyond annotations and align with destructiveHint=true.

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?

It front-loads purpose and enumerates actions compactly, but is a dense single paragraph with nested parentheticals and some repetition of schema text. Still, it is appropriately sized for a six-parameter multi-action tool.

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?

No output schema exists, and the description explains effects and where to read results, but does not describe confirmation/return behavior or invalid monitor_key handling. Given destructive annotations and rich schema coverage, it is mostly complete but not exhaustive.

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 83%, so the baseline is 3. The description adds action-enum semantics and page-vs-topic meaning for watch/query/domains, though it repeats the watch schema text; some optional parameters such as frequency remain primarily schema-documented.

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?

It states a specific verb ('Change') and resource ('web watches'), scopes to one existing watch by monitor_key from get_web_watches, and enumerates each action. This lets an agent distinguish it from get_web_watches and other siblings.

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?

For each action it explains the situation: check_now for immediate check vs schedule, pause/resume, stop permanently, update frequency/target. It also directs reading resulting changes to get_web_watches. It does not explicitly name watch_web for creating a new watch, so routing to the creation sibling is left implicit.

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