dsl_stop

THE RISK

High Risk

This tool executes a command that controls external media playback state in REAPER. While stopping playback is not destructive (no data is lost or irreversibly modified) and cannot cause financial harm, it is an Execute-category action because it triggers an external operation whose effects depend on the current state of the application.

From the tool's definition The tool description states "Stop the music" and "stop, pause, halt, wait, or cease playback", indicating it triggers an immediate action that controls REAPER's playback state.

Documented attack patterns abuse exactly the kind of access dsl_stop gives an agent:

HOW TO CONTROL DSL_STOP

PolicyLayer is an MCP gateway — it sits between your AI agents and REAPER MCP Server, and nothing reaches the server without passing your rules. This is the rule we recommend for dsl_stop:

policy.json

{
  "version": "1",
  "default": "deny",
  "tools": {
    "dsl_stop": {
      "limits": [
        {
          "counter": "dsl_stop_rate",
          "window": "minute",
          "max": 10,
          "scope": "grant"
        }
      ]
    }
  }
}

dsl_stop 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.

Create a free account and register REAPER MCP Server — nothing to install.
Add this policy — paste it, or build it visually.
Point your MCP client (Claude, Cursor, anything) at your gateway URL.

RATE-LIMIT THIS TOOL →

Free to start. No card required.

EXPLORE

More REAPER MCP Server tools

Destructive dsl_reset_context Start fresh with a clean slate. Use when users want to begin again or clear previous refer Destructive dsl_track_delete dsl_track_delete Destructive dsl_track_delete_all dsl_track_delete_all Execute dsl_play Start playing your music. Use for any variation of play, start, go, listen, or hear. Execute dsl_record Start recording. Use for 'record', 'start recording', 'rec'. Execute dsl_quantize dsl_quantize Execute dsl_render dsl_render Write dsl_add_effect Add an effect to a track. Use for 'add reverb to vocals', 'put compression on drums',

All 45 REAPER MCP Server tools →

Execute tools on other servers

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Go deeper

High-risk tools in REAPER MCP Server → Every high-risk tool this server exposes, in one view.
All high-risk MCP tools → Every high-risk tool across the catalogue, and the policy pattern that contains them.
The MCP Attack Database → Documented attack patterns against MCP deployments — and the policies that stop them.
Rate Limiting MCP Tool Calls: A Practical Guide →
MCP Security: Why Prompt Guardrails Aren't Enough →

FAQ

What does the dsl_stop tool do? +

Stop the music. Use for stop, pause, halt, wait, or cease playback. It is categorised as a Execute tool in the REAPER MCP Server MCP Server, which means it can trigger actions or run processes. Use rate limits and argument validation.

How do I enforce a policy on dsl_stop? +

Register the REAPER MCP Server MCP server in PolicyLayer and add a rule for dsl_stop: 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 MCP Server. Nothing to install.

What risk level is dsl_stop? +

dsl_stop is a Execute tool with high risk. Execute tools should be rate-limited and have argument validation enabled.

Can I rate-limit dsl_stop? +

Yes. Add a rate_limit block to the dsl_stop 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.

How do I block dsl_stop completely? +

Set action: deny in the PolicyLayer policy for dsl_stop. 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.

What MCP server provides dsl_stop? +

dsl_stop is provided by the REAPER MCP Server MCP server (shiehn/total-reaper-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

Enforce policy on every REAPER MCP Server tool call.

Deterministic rules across all 45 REAPER MCP Server tools. Per-identity grants. Full audit log. Live in minutes. Nothing to install.

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45 REAPER MCP Server tools catalogued and risk-classified — across an index of 42,500+ MCP servers.

// WHAT DSL_STOP ON REAPER MCP SERVER DOES

// THE RISK

// HOW TO CONTROL DSL_STOP

// EXPLORE