sync_timeline_playback

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

With no annotations provided, the description carries full burden for behavioral disclosure. It only states 'sync playback', failing to explain what synchronization entails (e.g., start/stop/seek together), side effects, permissions required, or the impact on timeline states. This is insufficient for a mutation-like tool.

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 short sentence, which is efficient but under-specified for a tool with 3 parameters and no annotations. It sacrifices completeness for brevity.

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 3 parameters, no output schema, and no annotations, the description is incomplete. It does not explain return values, behavior during sync, or error conditions. More detail is needed for a tool managing playback synchronization.

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 low (33%), yet the description adds no parameter details. It does not explain 'stagger', 'syncMode', or 'timelineIds' beyond what the schema provides. The description should compensate for missing schema descriptions but does not.

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 '同步播放多个时间轴' clearly states the action: synchronizing playback across multiple timelines. This distinguishes it from sibling tools like 'create_sync_timeline' which creates sync timelines, and 'parallel_animation' which handles parallel execution but not playback sync.

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 description implies usage when multiple timelines need synchronized playback, but it lacks explicit guidance on when to use this tool over alternatives like 'sequence_animation' or 'parallel_animation'. No exclusions or prerequisites are stated.

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