arrangement_play

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

With annotations already declaring readOnly=false, idempotent=true, and destructive=false, the description adds the key behavioral effect: all tracks resume following the arrangement, the playhead moves, and playback starts. It does not explain how existing session clip playback is overridden, but it supplies substantive state-change context beyond the 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?

The definition is a single front-loaded sentence with a helpful parenthetical analogy and no wasted text. Every clause contributes to explaining the action or its effect.

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 simple one-parameter playback command with full annotation coverage and no output schema, the description explains what happens and the main side effect. It could be slightly richer about its interaction with transport_stop or transport_play, but it is sufficient to invoke correctly.

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%, and the single from_beat parameter is already documented in the schema as 'Start (default 0)'. The description only echoes 'from a beat' without adding units, range, or behavioral detail, so the baseline 3 is appropriate.

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 states a specific verb and resource ('Play the timeline from a beat') and distinguishes this from generic transport playback by noting that every track follows the arrangement again, like Back to Arrangement. It does not explicitly name the transport_play sibling, but the arrangement-specific behavior is clear enough to separate the two.

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 use case is implied — re-engaging arrangement playback from a beat, similar to Back to Arrangement — but the description never explicitly says when to choose this over transport_play or when not to use it. No prerequisites or exclusions are given.

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