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

Annotations already declare readOnlyHint=true and openWorldHint=true, so the safe read-only nature is covered. The description adds that output includes 'normalized offer records,' hinting at return content, but discloses no auth needs, rate limits, or pagination behavior; an output schema is present so returns need not be explained.

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 sentences with zero waste; the core action is front-loaded and the routing guidance follows immediately. Every clause earns its place.

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 readOnly/openWorld annotations, a full output schema, and 100% param coverage, the description only needs to establish purpose and routing, which it does well. Minor gaps remain around pagination/scale of episode results but nothing blocks correct 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 coverage is 100%, so country/language defaults are already documented. The description adds genuine value by directing the agent to source the raw season_id from justwatch_season_by_id, clarifying the identifier's provenance beyond the schema's format hint.

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?

States a specific verb ('Fetch') and resource ('episode and normalized offer records for a JustWatch season'). It explicitly differentiates from siblings justwatch_episode_offers and justwatch_show_seasons, so an agent can route correctly without opening a schema.

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?

Explicitly states where to obtain the required input ('Get the raw season ID from justwatch_season_by_id') and names two alternatives with their selecting conditions (justwatch_episode_offers for one episode, justwatch_show_seasons to list seasons). No inference required.

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