crunchyroll_update_playhead

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

No annotations are provided, so the description must carry the full burden. It confirms mutation ('update') but fails to disclose side effects, authentication requirements, rate limits, or what happens on success/failure. For a mutation tool with zero annotation coverage, this is insufficient.

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 a single minimal sentence (8 words) with no wasted text, front-loading the core purpose. However, it could be slightly expanded to include behavioral details without losing conciseness.

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?

Given the simple parameters (2) and no output schema, the description is incomplete for a mutation tool. It fails to explain how updating playhead relates to other tools like 'crunchyroll_get_playheads' or what side effects occur, leaving the agent without critical context.

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 clear descriptions for both parameters ('Position in seconds', 'Episode or movie ID'). The description adds no new information beyond the schema, meeting the baseline of 3.

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 action ('Update watch progress') and the resource ('episode or movie'), with a specific verb and scope. It effectively differentiates from sibling tools like 'crunchyroll_get_playheads' which retrieves progress.

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 is provided on when to use this tool versus alternatives such as 'crunchyroll_continue_watching' or 'crunchyroll_get_playheads'. The description lacks context on prerequisites or typical usage scenarios.

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