playback_control

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

With no annotations, the description carries the full burden of behavioral disclosure, yet it only lists the three actions. It does not state whether PLAY restarts from the beginning or resumes from the current frame, whether STOP rewinds the playhead or merely halts, whether PAUSE preserves position, or what side effects occur. The core state-transition semantics of a playback control are left entirely unspecified.

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 short sentence with the three actions front-loaded and zero filler. Every word carries information, and the length is appropriate for a one-parameter tool. This is an exemplary size-to-content ratio.

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 low complexity (one required scalar parameter, no nested objects) and the presence of an output schema, the description need not explain return values. However, it omits playhead behavior (restart vs. resume, stop vs. rewind) and does not distinguish itself from set_frame or set_playback_range, leaving an agent to guess state transitions. Adequate for the simplest call path, but with clear 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 action parameter is a bare string with no enum, so the description's enumeration of PLAY, PAUSE, STOP is the only constraint on valid values — genuine value beyond the schema. However, it stops at the value list and does not explain each action's behavior, expected casing, or the effect of an unknown value.

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 resource ('animation playback') and enumerates the three operations (PLAY, PAUSE, STOP), which anchors the tool's role and implicitly separates it from animation-related siblings like set_frame, set_playback_range, and render_animation. The verb 'Control' is somewhat generic, but the explicit action list pins down what the tool does. It earns a 4 rather than a 5 because the differentiation from siblings is implicit, not stated.

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 the many animation-related siblings (set_frame, set_frame_range, set_playback_range, render_animation, frame_selected). No prerequisites, exclusions, or alternatives are mentioned. An agent must infer applicability solely from the name and the three listed actions, which is minimal routing support.

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