Get FX chain for a track (names, enabled, presets, param counts).
AI agents call fx_get_chain to retrieve information from ReaperMCP without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool retrieves and queries existing FX chain metadata (names, enabled states, presets, parameter counts) from a REAPER track. It exhibits no destructive, write, execute, or financial capabilities. The operation is purely informational with no ability to modify audio, delete data, or trigger external operations. Confidence is high because the description explicitly describes a retrieval operation.
From the tool's definition Tool name and description: 'Get FX chain for a track (names, enabled, presets, param counts)' — uses the verb 'Get' and performs information retrieval with no modification or side effects. Returns read-only data about FX chain configuration.
Documented attack patterns abuse exactly the kind of access fx_get_chain 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 fx_get_chain:
{
"version": "1",
"default": "deny",
"tools": {
"fx_get_chain": {}
}
}fx_get_chain is read-only, so it stays allowed — but everything else on the server is denied unless you say otherwise.
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Get FX chain for a track (names, enabled, presets, param counts). It is categorised as a Read tool in the ReaperMCP MCP Server, which means it retrieves data without modifying state.
Register the Reaper MCP server in PolicyLayer and add a rule for fx_get_chain: 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.
fx_get_chain is a Read tool with low risk. Read-only tools are generally safe to allow by default.
Yes. Add a rate_limit block to the fx_get_chain 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 fx_get_chain. 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.
fx_get_chain 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.