continue_playing

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

With no annotations, the description alone must disclose behavior. It does note a key behavioral trait (resuming from current position instead of restarting), which adds value beyond the tool name. However, it does not address edge cases such as behavior when already playing, or whether it differs from start_playback in that scenario.

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, focused sentence that immediately conveys the core action and its distinguishing nuance. No filler or 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 (no parameters, no complex effects, output schema present), the description provides adequate context for an agent to select and invoke it correctly. It could mention behavior if already playing, but this is a minor gap for such a basic transport control.

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 schema is empty. According to the rubric, a baseline of 4 is appropriate when there are no parameters, and the description does not need to explain parameter semantics further.

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 uses a specific verb ('continue') and resource ('playback'), and clarifies the scope ('from the current position without restart'). This clearly differentiates it from sibling tools like start_playback, which would initiate playback, likely from a different position.

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 phrase 'without restart' conveys the intended use case: resuming from a paused or stopped position rather than restarting from the beginning. However, it does not explicitly name alternative tools or state when not to use it, so the guidance remains implied rather than explicit.

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