node9_undo_revert

THE RISK

Critical Risk

Reverting a working directory to a prior snapshot irreversibly overwrites the current state of the working directory. Any changes made after the snapshot was taken would be lost and cannot be recovered, making this a destructive operation. The blast radius is high because it can affect an entire working directory's contents.

From the tool's definition Revert the working directory to a specific node9 snapshot

Documented attack patterns abuse exactly the kind of access node9_undo_revert gives an agent:

HOW TO CONTROL NODE9_UNDO_REVERT

PolicyLayer is an MCP gateway — it sits between your AI agents and Node9-Proxy, and nothing reaches the server without passing your rules. This is the rule we recommend for node9_undo_revert:

policy.json

{
  "version": "1",
  "default": "deny",
  "hide": [
    "node9_undo_revert"
  ]
}

node9_undo_revert 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 Node9-Proxy — 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 Node9-Proxy tools

Write node9_approver_set Enable or disable a specific node9 approver channel in the global config (~/.node9/config. Write node9_rule_add Add a new protective smart rule to the global node9 config (~/.node9/config.json). Write node9_shield_disable Disable a node9 shield. Use node9_shield_list to see currently active shields. Write node9_shield_enable Enable a node9 shield for a specific service. Shields only add protection — they cannot Read node9_approver_list List all node9 approver channels and their current enabled/disabled state. Read node9_audit_get Read recent entries from the node9 audit log (~/.node9/audit.log). Read node9_config_get Read the current node9 configuration: security mode, approver channels, timeouts, Read node9_policy_get Show all active smart rules in detail — name, tool, verdict, conditions, and reason.

All 16 Node9-Proxy tools →

Destructive tools on other servers

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Go deeper

Critical-risk tools in Node9-Proxy → 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 node9_undo_revert tool do? +

Revert the working directory to a specific node9 snapshot. It is categorised as a Destructive tool in the Node9-Proxy 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 node9_undo_revert? +

Register the Node9-Proxy MCP server in PolicyLayer and add a rule for node9_undo_revert: 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 Node9-Proxy. Nothing to install.

What risk level is node9_undo_revert? +

node9_undo_revert 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 node9_undo_revert? +

Yes. Add a rate_limit block to the node9_undo_revert 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 node9_undo_revert completely? +

Set action: deny in the PolicyLayer policy for node9_undo_revert. 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 node9_undo_revert? +

node9_undo_revert is provided by the Node9-Proxy MCP server (node9-ai/node9-proxy). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

Enforce policy on every Node9-Proxy tool call.

Deterministic rules across all 16 Node9-Proxy tools. Per-identity grants. Full audit log. Live in minutes. Nothing to install.

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16 Node9-Proxy tools catalogued and risk-classified — across an index of 42,500+ MCP servers.

// WHAT NODE9_UNDO_REVERT ON NODE9-PROXY DOES

// THE RISK

// HOW TO CONTROL NODE9_UNDO_REVERT

// EXPLORE