play_timeline

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

With no annotations, the description must disclose behavioral traits, but it only states the action without any side effects. It doesn't mention whether it requires an active sequence, whether it toggles playback, or what happens if no timeline is open. The phrase 'expanded operation' adds no concrete behavior.

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 one short sentence with no wasted words, but the phrase 'Premiere Pro expanded operation' is generic and could be omitted. It is front-loaded with the core verb and object, making it easy to scan.

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 simplicity (no params, no output schema), the description is minimally adequate, but it leaves ambiguity about preconditions and behavior. It doesn't state if it starts from current playhead or requires an active sequence, which could matter for agents deciding between play_timeline and play_source_monitor.

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 and the input schema is empty, so there is nothing to explain. The instruction sets a baseline of 4 for 0-param tools, and the description doesn't need to add anything. It correctly stays silent on parameters.

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 clearly states the tool plays the timeline, distinguishing it from sibling tools like play_source_monitor which targets the source monitor. It uses a specific verb (play) and resource (timeline), so it's not a tautology. However, it doesn't elaborate on the scope (e.g., from current playhead) beyond the action itself.

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 on when to use this tool vs alternatives such as play_source_monitor or stop_playback. The description doesn't mention prerequisites (e.g., an open sequence) or context like whether it starts or toggles playback. No exclusions or alternatives are noted.

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