list_discover_watchlist

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

Annotations already cover read-only, idempotent, and non-destructive behavior, lowering the burden on the description. The description adds the endpoint and indicates the page query parameter, implying pagination, but does not disclose response behavior, limits, or ordering. It does not contradict the 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 with the core purpose. The endpoint and parameter note are useful and nothing is overly verbose. It lacks some detail, but what is present is efficiently organized.

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 fairly simple, has strong annotations, and an output schema, so the description does not need to explain return values. However, given the ambiguous relationship to sibling watchlist tools and the minimal parameter explanation, the description is barely adequate for correct selection and invocation.

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 needed to compensate. It only says 'page: Query parameter,' which adds little beyond the schema field name and default. There is no explanation of page semantics, starting index, page size, or how pagination behaves.

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 states a specific verb and resource: 'Get the Plex watchlist.' This is clear and actionable, and the endpoint is also included. However, it does not explicitly differentiate this from sibling tools like get_user_by_user_id_watchlist, which could also be described as getting a watchlist.

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 gives no guidance on when to use this tool versus alternatives. It does not mention that get_user_by_user_id_watchlist exists for a specific user's watchlist, nor does it explain what makes this discover watchlist distinct. The usage context is essentially left to inference.

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