transfer_playback

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

No annotations are provided, so the description carries the full burden. It discloses the action and the source of device IDs but omits potential side effects (e.g., whether playback state changes, authentication requirements, or errors). It is adequate for a simple operation but lacks depth expected for a mutation tool without annotations.

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?

Two short, direct sentences, immediately stating the action and the key dependency. Every word adds value, with no fluff or redundancy. Perfectly sized for a tool with only two parameters.

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 of the tool (2 params, no nested objects, no output schema), the description is mostly sufficient. It explains the core operation and the source of valid device IDs. A slightly more detailed note about the 'play' parameter's effect might improve it, but the schema already covers that. Overall, complete for its complexity.

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 description coverage is 100%, so the baseline is 3. The description's reference to get_devices reinforces the schema's deviceId description but does not add new semantic meaning beyond what is already in the schema. No extra detail about the 'play' parameter is provided, but the schema already explains 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 clearly states the tool's action ('Transfer playback') and resource ('to a different Spotify Connect device'), distinguishing it from sibling tools like play/pause or volume control. The phrase 'different' implies switching devices, which aligns with the tool's name and function.

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?

Provides clear context on how to use the tool ('Use device IDs from get_devices'), indicating a prerequisite dependency. However, it does not explicitly mention when not to use it or contrast with alternative tools like 'play' or 'pause', so it lacks explicit exclusions. Still, the usage context is clear.

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