set_playback_range

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

No annotations are provided, so the description carries the full burden of behavioral disclosure. It only states the core behavior and the visual timeline cue, but does not mention constraints like start <= end, behavior on invalid input, side effects on the playhead, or whether cooking or scrubbing is triggered.

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 short, front-loaded with the purpose, and structured with an Args block. It is efficient, though the parameter lines largely repeat what the schema already exposes without adding substantial new meaning.

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 is nearly usable, but without annotations, usage guidance, or richer parameter semantics, it leaves meaningful gaps around validation, invalid ranges, and relationship to sibling timeline tools. An agent could call it incorrectly with inverted or unreasonable values.

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 input schema has no property descriptions, so the description must add the missing semantics. The description only says 'Start frame' and 'End frame', which only slightly extends the property names and leaves out units, inclusivity, ordering constraints, and valid ranges undocumented.

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 names a specific action and resource: 'Set the playback range' and clarifies it as the 'green bar in the timeline'. This is clear and usable, but it does not distinguish the tool from siblings like set_frame_range or playbar_control.

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?

There is no guidance about when to use this tool versus alternatives such as set_frame_range, set_frame, or playbar_control. No context, exclusions, or prerequisites are provided, so an agent must infer when this tool is the right choice.

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