marker_delete

THE RISK

Critical Risk

Why marker_delete needs a policy

The tool permanently removes markers/regions from an audio project with no undo capability exposed through the MCP interface. While markers are metadata rather than audio content, their deletion is irreversible and could corrupt project organization, cue points, or arrangement structure. This qualifies as Destructive (irreversible deletion) rather than Write (reversible modification).

From the tool's definition Tool name 'marker_delete' with description 'Delete marker/region' explicitly performs irreversible deletion of markers or regions in a REAPER project.

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

POLICY

How to control marker_delete

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 marker_delete:

policy.json

{
  "version": "1",
  "default": "deny",
  "hide": [
    "marker_delete"
  ]
}

marker_delete disappears from the agent's tool list entirely, and any attempt to call it is denied. The rest of the server keeps working.

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

RESTRICT THIS TOOL →

Free to start. No card required.

EXPLORE

Related tools and policies

More ReaperMCP tools

Destructive envelope_clear_range envelope_clear_range Destructive fx_remove Remove FX from track chain. Destructive item_delete Delete an item. Destructive midi_delete_all_notes Clear all notes from a MIDI item. Destructive midi_delete_cc Delete a CC event. Destructive midi_delete_note Delete a note. Destructive tempo_clear_all Delete every tempo/time-sig marker — resets the project to its base tempo. Destructive tempo_delete_marker Delete a tempo/time-sig marker by its index (from tempo_list_markers).

All 138 ReaperMCP tools →

Destructive tools on other servers

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Go deeper

Critical-risk tools in ReaperMCP → Every critical-risk tool this server exposes, in one view.
All critical-risk MCP tools → Every critical-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.
Blast radius → How much damage one compromised or confused agent can do — and how to bound it.
Tool call approval → Approval gates on individual tool calls: auto-allow, prompt, or deny.
Rate Limiting MCP Tool Calls: A Practical Guide →
MCP Security: Why Prompt Guardrails Aren't Enough →

FAQ

Questions about marker_delete

What does the marker_delete tool do? +

Delete marker/region. It is categorised as a Destructive tool in the ReaperMCP MCP Server, which means it can permanently delete or destroy data. Block by default and require explicit approval.

How do I enforce a policy on marker_delete? +

Register the Reaper MCP server in PolicyLayer and add a rule for marker_delete: 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.

What risk level is marker_delete? +

marker_delete is a Destructive tool with critical risk. Critical-risk tools should be blocked by default and only enabled with explicit human approval.

Can I rate-limit marker_delete? +

Yes. Add a rate_limit block to the marker_delete 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 marker_delete completely? +

Set action: deny in the PolicyLayer policy for marker_delete. 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 marker_delete? +

marker_delete 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.

Enforce policy on every ReaperMCP tool call.

Start from ReaperMCP, add the rest of your stack, and see everything your agents can call. Then put policy on all of it.

CHECK YOUR STACK →