get_user_by_user_id_watchlist

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

Annotations already declare readOnlyHint, idempotentHint, and destructiveHint, so the safety profile is covered. The description adds the endpoint path and parameter locations but not additional behavioral context such as authentication requirements, rate limits, or response behavior. No contradiction with annotations.

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?

The description is short and front-loaded, starting with the core purpose. The Arg section is slightly redundant with the schema but adds parameter-location details efficiently. No filler or unnecessary prose.

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 tool is a simple read-only retrieval with an output schema, so return-value documentation is not required. The endpoint, resource, and parameter locations are given. The only notable gap is the lack of detail about page semantics, but this is minor for a straightforward watchlist lookup.

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%, so the description carries some responsibility. It labels user_id as a path parameter and page as a query parameter, which adds value beyond the raw schema. However, it does not explain what 'page' controls, how pagination works, or the meaning of user_id beyond its obvious name.

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 clearly states the tool retrieves a specific user's Plex watchlist, using a specific verb and resource. It is distinct enough from sibling tools like get_user_by_user_id_watch_data and get_user_by_user_id, though it does not explicitly call out those alternatives.

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 implies the use case: when you need the Plex watchlist for a particular user. However, it gives no explicit guidance on when to prefer this over similar get_user_by_user_id_* endpoints, no pagination notes, and no exclusions or preconditions.

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