stop_playback

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

With no annotations, the description bears full burden. It adds the implementation detail 'Uses QE DOM' which provides some technical context but does not explain side effects or error conditions. The behavior is straightforward for a stop action, so the description is minimally adequate.

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 extremely concise: two short sentences. The first sentence front-loads the core action and resource, and the second adds a minor technical note. Every word earns its place with no redundancy.

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 tool's simplicity (zero parameters, no output schema, no annotations), the description covers the essential purpose. It does not explain return values (likely void) or error cases, but for a basic stop action this is reasonably complete. Minor improvement could be made by stating 'stops playback if currently playing'.

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 schema coverage is 100%. The description adds no parameter information, which is acceptable as there are no parameters to describe. The baseline score of 4 applies per guidelines.

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 action ('Stop playback') and the target resource ('active sequence timeline'). It effectively distinguishes itself from sibling tools like 'play_timeline' which starts playback. However, it could be more precise by explicitly stating that it does not affect source monitor playback.

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?

No guidance is provided on when to use this tool versus alternatives. There is no mention of prerequisites (e.g., playback must be active), nor any indication of when not to use it. The sibling 'play_timeline' would be the natural complement, but no comparison is made.

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