mcp_opendaw_create_trance_arrangement

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

With no annotations, the description carries the full burden. It provides extensive behavioral detail: exact drum pattern, bass pattern, arp pattern, lead style, chord progression, and output (notes per track). However, it does not disclose whether the tool overwrites existing notes on the specified tracks or requires empty tracks, which is a notable gap in side-effect transparency for a generative tool.

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 well-structured: it opens with a one-line summary, then uses bullet points for each track, includes a genre differentiation paragraph, and ends with concise parameter definitions and examples. While lengthy, every section adds valuable information for an AI agent to understand and invoke the tool correctly.

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?

The description provides enough context for invocation: it explains the musical output, parameter meanings, and mentions the return value (notes per track and total). It hints at prerequisites ('unit_index: AU index with note tracks') and gives examples. However, it lacks clarification on velocity and start_beat, and does not specify behavior if tracks already contain notes, which is a minor completeness gap.

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?

Since schema description coverage is 0%, the description must explain the parameters. It covers bpm, bars, root, octave, unit_index, and the four track indices, with ranges and musical rationale (e.g., 'root: Root note (F is a classic trance key — Fm)'). However, it omits velocity and start_beat entirely, which are present in the schema but not explained in the description.

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 immediately states the tool's function: 'Create a full trance arrangement — driving drums + rolling bass + supersaw arp + pluck lead across 4 tracks.' It clearly identifies the genre and differentiates from sibling arrangement tools through detailed musical comparisons (e.g., 'house has off-beat stabs, techno has sub drones, synthwave has 16th arpeggios, trance has rolling 8ths'). This makes the purpose unmistakable.

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 explicitly explains when to use this tool: for uplifting trance with a rolling off-beat bass, and contrasts it with other genres ('same as synthwave but faster and euphoric... different from house, techno, synthwave'). It also provides default BPM and key context, giving the agent clear criteria for selecting this tool over alternatives.

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