playback_stop

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

With no annotations provided, the description carries the full burden of behavioral disclosure. While it mentions what the tool does, it doesn't describe important behavioral aspects like whether this requires specific permissions, what happens to ongoing audio streams, error conditions, or response format details. The description provides basic functionality but lacks depth for a mutation 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 well-structured with clear sections (purpose, args, returns) and uses bullet-like formatting. While efficient, the 'Returns' section could be more specific than 'Dict[str, Any]: Response data' given there's no output schema. Overall, it's appropriately sized with minimal waste.

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 tool with 1 parameter (though the description documents 3), 0% schema coverage, no annotations, and no output schema, the description does a reasonable job. It covers parameters well but lacks behavioral context about permissions, side effects, and response structure. The description is adequate but has clear gaps given the complexity of an audio control tool.

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 description provides comprehensive parameter documentation that fully compensates for the 0% schema description coverage. It clearly explains all three parameters (call_control_id, overlay, stop) with their purposes, requirements, optionality, default values, and valid values. This adds significant meaning beyond what the minimal input schema provides.

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 specific action ('Stop audio playback') and resource ('on a call'), distinguishing it from sibling tools like 'playback_start' and 'speak' which start audio rather than stop it. The verb+resource combination is precise and unambiguous.

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 context (stopping audio during a call) but doesn't explicitly state when to use this tool versus alternatives like 'hangup' or 'transfer'. No guidance is provided about prerequisites or exclusions, leaving usage context somewhat implied rather than explicitly defined.

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