set_playback_range

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

The description essentially restates the tool name, adding no behavioral context beyond the annotation (idempotentHint) already provides. It does not contradict annotations, but also does not disclose any additional traits such as side effects or scope.

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 concise sentence, front-loaded with the core action and resource. It is appropriately brief for the simplicity of the operation, though it could contain slightly more useful detail without becoming verbose.

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 simple two-parameter setter, the description conveys the essential purpose. However, it lacks usage differentiation from similar tools and parameter explanations, making it less complete than ideal. The presence of an output schema and annotation mitigates some gaps.

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 description coverage is 0%, and the description gives no explanation of what 'start' and 'end' mean. While the parameter names are intuitive, the description does not compensate for the lack of schema descriptions, leaving the agent to infer semantics.

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 sets a preview/playback range with the verb 'set' and a specific resource. However, it does not distinguish from the sibling tool 'set_frame_range', which could be considered similar in function.

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 like set_frame_range or playback_control. The description gives no context about the intended use case or exclusions.

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