set_playback_range

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

No annotations are supplied, so the description carries the full behavioral burden and mostly fails: it does not say whether the values are frames, seconds, or normalized, whether order matters, whether the change persists in the scene file, or what happens to existing playback settings. The only behavioral hint is the visual identity of the green bar.

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?

A single front-loaded sentence with zero filler; the key noun phrase comes first and the parenthetical aids recognition. It is efficient, though the brevity is partly under-specification rather than disciplined concision.

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-number setter with no output schema and no annotations, the definition is minimally callable but leaves the unit ambiguity unresolved. Given the sibling set_frame_range exists, one clause of disambiguation would have made it complete.

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 two required parameters are bare numbers named "start" and "end" with no units, range, or ordering constraints. The description mentions a "range" but adds no meaning to start/end beyond what the property names already suggest.

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?

Specific verb + resource ("Set the playback range") plus a concrete visual anchor ("green bar in the timeline") that tells an agent exactly which UI object changes. It stops short of 5 because it never distinguishes itself from the sibling set_frame_range, which an agent could easily confuse with a playback range.

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 phrase "playback range" implies usage during playback/animation work, but there is no explicit when-to-use, when-not-to-use, or alternative such as set_frame_range. The agent must infer the boundary between playback range and frame range on its own.

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