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

The description adds real value beyond the annotations (readOnlyHint=false, openWorldHint=true, idempotentHint=false) by disclosing that the call returns a secret token, that the token must be stored securely, and that the watch is polled for hash changes. It stops short of covering rate limits, auth requirements, or interval 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?

Two tightly packed sentences with no filler. The core action is front-loaded and the token-handling instruction follows immediately.

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?

An output schema exists, so return-value explanation is not strictly required, and the description still usefully flags the secret token. What is missing for a stateful create tool is any guidance on the interval/expiry parameters or polling cadence, which the agent must derive from the schema alone.

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 description coverage is 0% and none of the three parameters (url, interval_seconds, expires_in_seconds) are mentioned by name. 'Time-bounded' marginally gestures at expires_in_seconds, but the 900s minimum and 86400s maximum constraints, and the required URL, are left entirely to 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 gives a specific verb and resource: 'Create a time-bounded watch for a public HTML or text source.' The verb 'Create' naturally separates it from siblings like source_watch_check, source_watch_status, and source_watch_delete, though no sibling is named explicitly.

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 by 'time-bounded watch' and the follow-up instruction to 'poll the watch for hash changes,' which hints at the downstream check flow. However, there is no explicit when-to-use/when-not guidance or named alternative, so an agent must infer the workflow.

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