AI agents invoke toggle_repeat to trigger actions in Reaper. What it does depends on the arguments the agent supplies, and its effects often reach beyond the immediate call — builds kicked off, notifications sent, workflows started.
This tool changes the playback state of REAPER DAW by toggling repeat/loop mode. It triggers an external operation (modifying DAW playback behavior) rather than simply reading data or writing persistent data. Misuse has low blast radius as it only affects playback looping.
From the tool's definition Toggle repeat/loop mode
Documented attack patterns abuse exactly the kind of access toggle_repeat 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 toggle_repeat:
{
"version": "1",
"default": "deny",
"tools": {
"toggle_repeat": {
"limits": [
{
"counter": "toggle_repeat_rate",
"window": "minute",
"max": 10,
"scope": "grant"
}
]
}
}
}toggle_repeat stays usable, but rate-capped — a runaway agent can't fire it dozens of times a minute. Everything else on the server is denied unless you say otherwise.
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Toggle repeat/loop mode. It is categorised as a Execute tool in the Reaper MCP Server, which means it can trigger actions or run processes. Use rate limits and argument validation.
Register the Reaper MCP server in PolicyLayer and add a rule for toggle_repeat: 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.
toggle_repeat is a Execute tool with high risk. Execute tools should be rate-limited and have argument validation enabled.
Yes. Add a rate_limit block to the toggle_repeat 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 toggle_repeat. 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.
toggle_repeat 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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