Create a multitrack session

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

Annotations declare it is a non-read-only, non-destructive, non-idempotent operation, so the mutation profile is covered. The description adds genuinely useful behavior beyond that: it discloses exactly which files are written (wav/aiff/flac, stems, MIDI, editable .scraft session) and that it reports peak and integrated LUFS plus returns a waveform picture, which the annotations do not convey.

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 purpose is front-loaded in the opening clause, which is good. However, the description is a single sprawling run-on sentence that enumerates nearly every field the schema already documents, so much of its length does not earn its place and hurts scannability.

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 an 18-parameter tool with no output schema, the description does well by describing the return artifacts (mix files, stems, MIDI, LUFS, waveform image). It omits nuance around overwrite/output path behavior, but those are covered by parameter descriptions, so nothing critical is missing for correct invocation.

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 89%, so the schema itself already documents nearly every parameter, giving a baseline of 3. The description usefully ties the parameter surface to a workflow (clip gain, fades, sends to aux busses, tempo, meter, key, markers) but adds no syntax, defaults, or constraints beyond what the schema already states.

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 names a specific verb and resource ('Build a song, podcast or soundtrack with SoundCraft... and mix it down') and enumerates the concrete artifacts it produces (mixdown, stems, MIDI, .scraft, LUFS report). It is clear what the tool does, but it never distinguishes itself from siblings like export_session (which also produces mixdowns) or edit_session, so an agent must infer the create-from-scratch scope.

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?

There is no explicit when-to-use or when-not-to-use guidance and no named alternative. With siblings like edit_session, export_session, and run_soundcraft_commands available, the agent gets no rule for choosing this tool over them; the create-from-scratch scenario is only weakly implied by 'Build a song... and mix it down'.

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