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

With no annotations, the description carries the full burden of behavioral disclosure. It explains that create_watch captures a baseline snapshot immediately, returns a watch_id and a token, and that the token is required for later check/manage operations. This goes beyond the base function and equips the agent with the non-obvious account-grouping 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?

Three dense sentences, front-loaded with the core action and immediately followed by the crucial output/token guidance. No filler words; every sentence contributes necessary operational detail.

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?

The description is strong for a creation tool: it names the returned identifiers, warns the agent to save the token, and explains the token reuse case. Since there is no output schema or annotations, a bit more detail about what 'monitoring' entails (e.g., polling behavior or failure modes) could improve completeness, but nothing essential for a first call is missing.

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?

All three parameters have schema descriptions (100% coverage), so the baseline is 3. The description adds genuine value beyond the schema by explaining the token's role in grouping watches and persistence: 'Pass an existing token to add more watches under the same account.'

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?

Description uses a specific verb and resource: 'Start monitoring a web page (or JSON/text URL) for changes.' This clearly distinguishes create_watch from its siblings (check_watch, delete_watch, list_watches) by describing the creation lifecycle, including capturing a baseline snapshot.

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?

The description clearly signals this is the setup tool: you start monitoring and receive credentials for later operations. It doesn't explicitly list when not to use it or name alternatives, but the lifecycle context and the instruction to pass an existing token for grouped watches provide adequate usage guidance.

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