Create an empty MIDI clip in the arrangement. Parameters: - track_index: Track number (1-based). - start_bar: Start bar (1-based). Takes precedence over start_beat. - end_bar: End bar (1-based). Used with start_bar to compute length. - start_beat: Start position in beats. - length_beats: Clip len...
AI agents use create_arrangement_midi_clip to create or update resources in Ableton MCP Extended — usually the action step of a workflow, after the agent has gathered context. Every call changes real data in your Ableton MCP Extended environment.
This tool creates new data (a MIDI clip) in the DAW session, which is a reversible modification. It does not execute arbitrary code, delete data irreversibly, or move money. Severity is medium because misuse could clutter a session with unwanted clips, but the action is easily undoable (clips can be deleted), and the blast radius is limited to the current project.
From the tool's definition Tool description states 'Create an empty MIDI clip in the arrangement' — the verb 'Create' indicates data creation.
Documented attack patterns abuse exactly the kind of access create_arrangement_midi_clip gives an agent:
PolicyLayer is an MCP gateway — it sits between your AI agents and Ableton MCP Extended, and nothing reaches the server without passing your rules. This is the rule we recommend for create_arrangement_midi_clip:
{
"version": "1",
"default": "deny",
"tools": {
"create_arrangement_midi_clip": {
"limits": [
{
"counter": "create_arrangement_midi_clip_rate",
"window": "minute",
"max": 30,
"scope": "grant"
}
]
}
}
}create_arrangement_midi_clip stays usable, but capped — an agent stuck in a loop can't make hundreds of changes a minute. Everything else on the server is denied unless you say otherwise.
Free to start. No card required.
Create an empty MIDI clip in the arrangement. Parameters: - track_index: Track number (1-based). - start_bar: Start bar (1-based). Takes precedence over start_beat. - end_bar: End bar (1-based). Used with start_bar to compute length. - start_beat: Start position in beats. - length_beats: Clip length in beats. - name: Optional clip name. It is categorised as a Write tool in the Ableton MCP Extended MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.
Register the Ableton MCP Extended MCP server in PolicyLayer and add a rule for create_arrangement_midi_clip: allow, deny, rate-limit, or require approval. Point your MCP client at the PolicyLayer proxy URL and the rule is enforced on every call, before it reaches Ableton MCP Extended. Nothing to install.
create_arrangement_midi_clip is a Write tool with medium risk. Write tools should be rate-limited to prevent accidental bulk modifications.
Yes. Add a rate_limit block to the create_arrangement_midi_clip rule in your PolicyLayer policy. For example, setting max: 10 and window: 60 limits the tool to 10 calls per minute. Rate limits are tracked per agent session and reset automatically.
Set action: deny in the PolicyLayer policy for create_arrangement_midi_clip. The AI agent will receive a policy violation error and cannot call the tool. You can also include a reason field to explain why the tool is blocked.
create_arrangement_midi_clip is provided by the Ableton MCP Extended MCP server (uisato/ableton-mcp-extended). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Deterministic rules across all 46 Ableton MCP Extended tools. Per-identity grants. Full audit log. Live in minutes. Nothing to install.
Free to start. No card required.
46 Ableton MCP Extended tools catalogued and risk-classified — across an index of 42,500+ MCP servers.