justwatch_discover

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

No annotations are provided, so the description carries the full burden. It fails to disclose behavioral traits such as pagination, default sorting, or API key requirements. The only behavioral hint is the limit clamping from the schema, which is not echoed in the description.

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, no fluff, and front-loads the purpose. It could be improved with a more structured list of constraints, but it remains efficient.

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?

With 9 parameters, no output schema, and no annotations, the description lacks essential context: what does 'popular' mean? Is there pagination? What is the max limit? How do filters combine? The description is insufficient for an agent to invoke the tool effectively.

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%, so the baseline is 3. The description repeats accepted values for type and monetization_types that are already in the schema, but adds no new semantics beyond what the parameter descriptions provide (e.g., filter combination logic).

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 discovers 'JustWatch titles' returning popular movies and shows filtered by optional parameters like genre, provider, monetization types, and release year bounds. It distinguishes from siblings like justwatch_search and justwatch_popular by focusing on filtered discovery.

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 implicitly explains usage by listing acceptable values for type and monetization_types, but it provides no explicit guidance on when to use this tool versus alternatives like justwatch_search or justwatch_popular. No when-not-to-use or alternative tool mentions.

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