AI agents use add_midi_notes to create or update resources in Reaper Reapy — usually the action step of a workflow, after the agent has gathered context. Every call changes real data in your Reaper Reapy environment.
Adding MIDI notes modifies a DAW project by creating or inserting note data into the timeline. This is a reversible write operation (notes can be deleted or edited). While it has blast radius if misused to generate unwanted audio/musical content, it's not destructive (can be undone), doesn't execute arbitrary code, and doesn't involve financial transactions.
From the tool's definition Tool named 'add_midi_notes' with no description; context from sibling tools shows this server controls REAPER DAW (audio/music production software) and includes operations like 'add_fx', 'create_midi_item', 'create_track'.
Documented attack patterns abuse exactly the kind of access add_midi_notes gives an agent:
PolicyLayer is an MCP gateway — it sits between your AI agents and Reaper Reapy, and nothing reaches the server without passing your rules. This is the rule we recommend for add_midi_notes:
{
"version": "1",
"default": "deny",
"tools": {
"add_midi_notes": {
"limits": [
{
"counter": "add_midi_notes_rate",
"window": "minute",
"max": 30,
"scope": "grant"
}
]
}
}
}add_midi_notes 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. It is categorised as a Write tool in the Reaper Reapy MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.
Register the Reaper Reapy MCP server in PolicyLayer and add a rule for add_midi_notes: 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 Reapy. Nothing to install.
add_midi_notes 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 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. 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 is provided by the Reaper Reapy MCP server (wegitor/reaper-reapy-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Deterministic rules across all 47 Reaper Reapy tools. Per-identity grants. Full audit log. Live in minutes. Nothing to install.
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47 Reaper Reapy tools catalogued and risk-classified — across an index of 42,500+ MCP servers.