get_currently_playing

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

With no annotations provided, the description must carry the full burden of behavioral disclosure. It discloses the returned data components (name, artists, progress, device, shuffle state, repeat state), which gives some expectation of output. However, it omits edge-case behavior such as what happens when nothing is playing, whether an active device is required, or whether the operation may fail—leaving a gap in transparency.

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, front-loaded sentence that states the action and specific return values without any fluff or repetition. Every word contributes meaning, achieving high conciseness and clear structure.

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 zero parameters and lack of output schema, the description is largely complete for selection and invocation. It lists the key return fields, so an agent knows what to expect. It would benefit from a note on edge cases (e.g., no track playing), but for a simple read-only getter, it is sufficiently 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?

The tool has zero parameters, so the schema is trivially 100% covered. The baseline for 0 params is 4, and the description adds no conflicting or redundant parameter info. It instead clarifies the tool's output, which is useful since there is no output schema.

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 specifies the action (Get) and the resource (currently playing track), and enumerates the exact fields returned (name, artists, progress, device, shuffle state, repeat state). This distinguishes it from siblings like 'spotify_status' or 'get_devices' by focusing on the current playback track details.

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 offers no guidance on when to use this tool versus alternatives, nor does it mention any exclusions or preferred contexts. With many related sibling tools (play, pause, get_devices), the lack of usage direction leaves the agent to infer appropriateness without support.

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