Create send between tracks. Prefer setup_routing for batch.
AI agents use send_create to create or update resources in ReaperMCP — usually the action step of a workflow, after the agent has gathered context. Every call changes real data in your ReaperMCP environment.
This tool creates a new send routing in REAPER, which modifies the project state by adding a track connection. This is a Write operation because it adds or modifies data (the send configuration) reversibly—the send can be removed or adjusted later. It is not Execute (no arbitrary code/command execution), not Destructive (the change is undoable), and not Financial.
From the tool's definition Tool description states: 'Create send between tracks.' The verb 'create' indicates the tool modifies the mixing/routing configuration by establishing a new signal flow connection between tracks, which is reversible (sends can be deleted or reconfigured).
Documented attack patterns abuse exactly the kind of access send_create gives an agent:
PolicyLayer is an MCP gateway — it sits between your AI agents and ReaperMCP, and nothing reaches the server without passing your rules. This is the rule we recommend for send_create:
{
"version": "1",
"default": "deny",
"tools": {
"send_create": {
"limits": [
{
"counter": "send_create_rate",
"window": "minute",
"max": 30,
"scope": "grant"
}
]
}
}
}send_create 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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Create send between tracks. Prefer setup_routing for batch. It is categorised as a Write tool in the ReaperMCP 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 send_create: 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 ReaperMCP. Nothing to install.
send_create 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 send_create 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 send_create. 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.
send_create is provided by the Reaper MCP server (xdarkzx/reaper-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Start from ReaperMCP, add the rest of your stack, and see everything your agents can call. Then put policy on all of it.
Free to start. No card required.
138 ReaperMCP tools catalogued and risk-classified — across an index of 43,000+ MCP servers.