justwatch_provider_titles

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

No annotations are provided, so the description must fully disclose behavior. It states the core function but does not mention that the operation is read-only, any required authentication, rate limits, or what happens if the provider name is invalid. For a simple lookup, minimal disclosure is acceptable but still incomplete.

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 concise sentences, front-loaded with the purpose. No redundant or extraneous words. Every sentence adds value.

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 has no output schema, so the description should explain the response structure. It only says 'Returns popular movie/show titles' without specifying format, pagination, ordering, or how to interpret results. Given 5 parameters, more details on output would improve completeness.

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% with all parameters described. The description adds a concrete example for the provider parameter ('such as `nfx`'), which adds slight value beyond the schema. However, it does not elaborate on semantics or relationships between parameters.

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's function: 'Get JustWatch provider titles' and specifies it returns popular movie/show titles for a given provider short name. It distinguishes from siblings like justwatch_providers (which returns providers) or justwatch_search (which searches titles).

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?

No guidance on when to use this tool versus alternatives like justwatch_discover, justwatch_genre_titles, or justwatch_popular. The sibling list includes many JustWatch tools, but the description does not differentiate usage contexts or mention when not to use this tool.

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