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

Beyond the annotations (idempotent, non-destructive, open-world), the description discloses the auth requirement and the exact failure shape including `retry_recommended` and `retry_after_seconds`, which is materially useful for error handling. It does not say what happens when a product is already watched, despite the idempotent hint.

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?

Front-loaded with the action, then prerequisite, then failure behavior — a logical order with no filler. The error-field enumeration is slightly listy but earns its place for recovery guidance.

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 values need no explanation, and the description covers auth and error recovery well. The only material gap is the missing clarification of the relationship to the near-identical `track_product` sibling.

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 100% and both parameters are self-documented, so the description's repetition of the `pwk_live_...` key format adds no new meaning. Baseline 3 applies since the schema does the heavy lifting.

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 ('Add a catalog product to your account watchlist') and adds the consequence ('the price scheduler keeps updating it'). It does not differentiate itself from the very similar sibling `track_product`, leaving an agent unsure which of the two is the right entry point.

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 scheduler consequence implies the use case, and the API-key prerequisite is stated, but there is no explicit guidance on when to choose this over `track_product` or how it relates to `unwatch_product`/`get_watch_status`. The agent must infer routing from names alone.

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