create_arrangement_midi_clip

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

With no annotations, the description carries the full burden. It discloses that the clip is 'empty' and requires a MIDI track, but does not mention side effects such as whether an existing clip at the position gets overwritten, error behavior, or any prerequisites beyond the track type.

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 concise and well-structured, starting with a clear one-sentence purpose followed by a compact Args list. No waste.

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?

All parameters are explained, the purpose is clear, and an output schema is present so return values are covered. The only gap is the lack of side-effect/overwrite information, which prevents a perfect score.

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 description adds substantial meaning beyond the schema: it defines track_index as zero-based, specifies that start_time and length are in beats, and notes the MIDI track constraint. This fully compensates for the 0% schema description coverage.

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: 'Create a new empty MIDI clip in the arrangement view.' This uses a specific verb+resource and distinguishes it from sibling tools like create_session_audio_clip or create_take_lane_midi_clip.

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?

It provides clear context: the clip is for the arrangement view, must be a MIDI track, and parameters are detailed. However, it does not explicitly mention when to use this tool over similar creation tools like create_clip or create_session_audio_clip, so it lacks exclusions/alternatives.

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