envelope_add_points
AI agents use envelope_add_points 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.
Adding envelope points creates new automation data in a REAPER project, which is a reversible write operation. The name implies creating/modifying automation envelope data. Confidence is reduced due to empty description.
From the tool's definition Tool name 'envelope_add_points' suggests adding points to an automation envelope in REAPER; description is empty.
Documented attack patterns abuse exactly the kind of access envelope_add_points 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 envelope_add_points:
{
"version": "1",
"default": "deny",
"tools": {
"envelope_add_points": {
"limits": [
{
"counter": "envelope_add_points_rate",
"window": "minute",
"max": 30,
"scope": "grant"
}
]
}
}
}envelope_add_points 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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envelope_add_points. 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 envelope_add_points: 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.
envelope_add_points 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 envelope_add_points 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 envelope_add_points. 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.
envelope_add_points 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.
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