justwatch_discover

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

No annotations are provided. The description explains it returns popular titles filtered by parameters and lists accepted values for type and monetization_types. It does not disclose rate limits, pagination, or caching behavior, leaving a moderate gap.

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 two sentences: one stating purpose and filters, and one providing a practical example. No filler, 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?

For a tool with 10 parameters and no output schema, the description covers the main functionality and a use case. It lacks details on return format or how 'popular' is determined, but the example helps compensate.

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?

The schema covers all 10 parameters with descriptions (100% coverage). The description adds value by explaining the combine use case for providers and production_countries, and explicitly listing accepted values for type and monetization_types.

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 it discovers JustWatch titles, returning popular movies and shows filtered by optional criteria. It specifies the resource and action, and distinguishes from siblings like justwatch_search or justwatch_popular by emphasizing filtering and popularity.

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?

Provides a concrete example of combining providers with production_countries to build charts. However, it does not explicitly state when not to use this tool versus siblings like justwatch_search, which might be better for direct title lookups.

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