add_midi_notes_batch
AI agents use add_midi_notes_batch to create or update resources in Reaper — usually the action step of a workflow, after the agent has gathered context. Every call changes real data in your Reaper environment.
The tool creates or adds MIDI notes to a music project, which is a reversible write operation. No description provided, lowering confidence slightly, but the naming pattern and context (music production with 130 tools in REAPER) clearly indicate this creates MIDI data rather than executing arbitrary code or destructively deleting data.
From the tool's definition Tool name 'add_midi_notes_batch' indicates batch creation of MIDI notes. Sibling tools like 'add_midi_note', 'add_marker', 'add_envelope_point' all perform reversible data creation operations in REAPER DAW.
Documented attack patterns abuse exactly the kind of access add_midi_notes_batch gives an agent:
PolicyLayer is an MCP gateway — it sits between your AI agents and Reaper, and nothing reaches the server without passing your rules. This is the rule we recommend for add_midi_notes_batch:
{
"version": "1",
"default": "deny",
"tools": {
"add_midi_notes_batch": {
"limits": [
{
"counter": "add_midi_notes_batch_rate",
"window": "minute",
"max": 30,
"scope": "grant"
}
]
}
}
}add_midi_notes_batch 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.
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add_midi_notes_batch. It is categorised as a Write tool in the Reaper MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.
Register the Reaper MCP server in PolicyLayer and add a rule for add_midi_notes_batch: 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 Reaper. Nothing to install.
add_midi_notes_batch 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 add_midi_notes_batch 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 add_midi_notes_batch. 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.
add_midi_notes_batch is provided by the Reaper MCP server (twelvetake-studios/reaper-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Start from Reaper, add the rest of your stack, and see everything your agents can call. Then put policy on all of it.
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158 Reaper tools catalogued and risk-classified — across an index of 43,000+ MCP servers.