play_timeline

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. 'Play timeline' communicates the core action but does not disclose whether it starts playback, toggles playback, requires an open project, is non-destructive, or what happens when playback is already running. There is no contradiction with annotations, but behavior beyond the literal action is 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?

The description is short, which is appropriate for a no-parameter tool, but part of it ('Premiere Pro expanded operation:') is boilerplate that does not earn its place. The meaningful content is only 'play timeline,' which is concise but under-specified.

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 tool with no annotations and no output schema, the description leaves important context unstated: which timeline is played, whether it starts playback from the current playhead, and how it relates to stop_playback or play_source_monitor. A phrase like 'Starts playback of the active timeline in Premiere Pro' would be far more 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?

The tool has zero parameters, so the baseline is 4. The empty input schema fully documents the parameter surface. The description adds no parameter details, but none are needed. The schema's additionalProperties: true is slightly odd but does not undermine the zero-parameter context.

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 states a clear verb and resource: 'play timeline.' This distinguishes it from siblings like play_source_monitor and stop_playback. However, the phrase 'expanded operation' is vague filler and does not clarify whether it means the active/main timeline or add any precision beyond the tool name.

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 play_source_monitor or stop_playback. The description does not mention prerequisites, the active sequence, or that stop_playback can halt playback. This is effectively no usage guidance.

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