delete_diagram

THE RISK

Critical Risk

This tool permanently removes diagram data without the ability to recover it. While the blast radius is contained to diagram files (not system-critical or financial data), deletion is inherently irreversible and destructive. Severity is medium rather than high because the impact is scoped to user-created diagrams rather than system infrastructure or sensitive data stores.

From the tool's definition Tool name is 'delete_diagram' and description states 'Delete the specified diagram session.' The verb 'delete' combined with the action of removing an entire diagram session indicates irreversible data destruction.

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

HOW TO CONTROL DELETE_DIAGRAM

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

policy.json

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

delete_diagram 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 Excalidraw 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.

RESTRICT THIS TOOL →

Free to start. No card required.

EXPLORE

More Excalidraw MCP Server tools

Destructive delete_element Delete a specific element from the canvas.\n\n Execute start_session Start browser preview and open Excalidraw editor interface.\n\n Write add_elements Add multiple Excalidraw elements to the canvas.\n\n Write add_template_architecture Add a built-in architecture diagram template to the canvas.\n\n Write create_diagram Create a new diagram or clear an existing session.\n\n Write create_from_mermaid Create diagram elements from Mermaid syntax.\n\n Write export_diagram Export the current diagram to a PNG, SVG, or JSON file.\n\n Write update_element Update attributes of an existing element.\n\n

All 11 Excalidraw MCP Server tools →

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Go deeper

Critical-risk tools in Excalidraw MCP Server → 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.
Rate Limiting MCP Tool Calls: A Practical Guide →
MCP Security: Why Prompt Guardrails Aren't Enough →

FAQ

What does the delete_diagram tool do? +

Delete the specified diagram session.\n\n. It is categorised as a Destructive tool in the Excalidraw MCP Server 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 delete_diagram? +

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

What risk level is delete_diagram? +

delete_diagram 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 delete_diagram? +

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

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

delete_diagram is provided by the Excalidraw MCP Server MCP server (scofieldfree/excalidraw-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

Enforce policy on every Excalidraw MCP Server tool call.

Deterministic rules across all 11 Excalidraw MCP Server tools. Per-identity grants. Full audit log. Live in minutes. Nothing to install.

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// WHAT DELETE_DIAGRAM ON EXCALIDRAW MCP SERVER DOES

// THE RISK

// HOW TO CONTROL DELETE_DIAGRAM

// EXPLORE