play_playlist

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

With readOnlyHint=false and destructiveHint=false already declared, the description adds real value by labeling the action 'additive, reversible' and naming the Automation permission requirement for Music. It also notes the returned now-playing state, going beyond what the annotations state.

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 compact lines, front-loaded with the action and resource; every clause (id source, reversibility, permission, return value) carries information.

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 one-parameter tool with annotations and an output schema, the definition covers the essentials: input source, permission requirement, mutation character, and return. Minor gaps remain around failure modes (e.g., invalid or missing playlist id) and whether playback replaces the current queue.

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 0% for the single 'id' parameter, so the description must compensate. It does clarify that the id is a persistent playlist id obtained from music_search rather than a name or index, but it gives no format or example of that id.

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?

States a specific verb and resource ('Play a Music playlist') and identifies the key input as a persistent id sourced from music_search. It separates itself from music_search, though it does not explicitly contrast with the sibling music_control, which also touches playback.

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 '(from music_search)' routes the agent to the right tool for obtaining the id, and the Automation-access prerequisite gives a usage condition. However, there is no explicit when-not guidance or comparison to music_control for generic playback control.

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