resumePlayback

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. It states the action and target device, but does not disclose what happens if playback is already playing, if no active device exists, or whether the call is idempotent. For a state-changing tool, this leaves important behavior 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 a single concise sentence, front-loaded with the verb, and contains no redundant or filler content. It maximizes clarity with minimal words.

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?

The tool is simple (one optional parameter, no output schema), and the description covers the basic action. However, the absence of annotations means the description should also cover behavioral edge cases and return behavior, which it does not. It is adequate but not fully 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?

Schema coverage is 100%, with the deviceId property already described as 'auto-selected if omitted'. The description only adds the phrase 'on the active device', which is consistent with the schema but does not provide significant additional meaning beyond it.

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 'Resume' and a clear resource 'Spotify playback', with a scope qualifier 'on the active device'. This distinguishes it from siblings like pausePlayback and playMusic, and makes the intent immediately clear.

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 verb 'Resume' implies the use case (when playback is paused), but the description does not explicitly state when to use this over alternatives like playMusic, nor does it mention any preconditions or exclusions. There is no explicit when-to-use or when-not-to-use guidance.

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