play

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

With no annotations, the description must carry the behavioral load. It does add real context: playback resumes from a paused state, and omitting mode falls back to the app's PAT/SONG switch. It does not state whether calling it while already playing is a no-op or an error, nor anything about permissions or return behavior.

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 core action is front-loaded in the first sentence, with per-parameter notes following in a compact block. Some phrasing is terse to the point of being clipped ('pattern: make this pattern (an id) the current one'), but there is no padding.

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 four-parameter transport tool with no annotations and no output schema, the definition covers the main semantics but leaves the unit parameter and the already-playing case undocumented. It is adequate to invoke correctly in common cases, but not 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 description coverage is 0%, so the description is the only documentation. It explains mode (pattern loops the current pattern, song plays the playlist) and pattern (makes that pattern current) and loosely glosses from_position as 'where to start'. The `unit` parameter (beats/ticks) is never mentioned, leaving a genuine ambiguity about how from_position is interpreted.

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 effect — 'Start playback, as the Play button' — plus the resume-when-paused behavior, which distinguishes it from pause/stop siblings in the tool list. It stops short of explicitly naming those siblings, but an agent can identify the operation without ambiguity.

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 'as the Play button' framing implies when to use it, and 'resumes when paused' hints at the state it applies to. There is no explicit when-not guidance, no mention of what happens if playback is already running, and no routing to pause/stop alternatives.

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