Delete an environment variable
AI agents call n8n_delete_variable to permanently remove resources in n8n MCP Server — typically in cleanup and lifecycle workflows. It does its job in a single call, and there is no undo.
Environment variables often contain critical configuration, secrets, or application state. Deleting one removes it permanently from the system. While not as severe as deleting user data or workflows, the irreversible nature and potential to break dependent services or expose security gaps (if the variable was masking a default) justifies 'Destructive' classification and 'high' severity.
From the tool's definition Delete an environment variable — the verb 'delete' is explicit, and environment variables are configuration data that, once removed, cannot be recovered without manual recreation. This is an irreversible operation.
Attacks that exploit this kind of access
Delete an environment variable. It is categorised as a Destructive tool in the n8n MCP Server MCP Server, which means it can permanently delete or destroy data. Block by default and require explicit approval.
Register the n8n MCP Server MCP server in PolicyLayer and add a rule for n8n_delete_variable: 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 n8n MCP Server. Nothing to install.
n8n_delete_variable is a Destructive tool with critical risk. Critical-risk tools should be blocked by default and only enabled with explicit human approval.
Yes. Add a rate_limit block to the n8n_delete_variable 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 n8n_delete_variable. 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.
n8n_delete_variable is provided by the n8n MCP Server MCP server (shravan1610/n8n-mcp-server). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Every MCP server has a record like this.
Type a name, get the same breakdown: verified identity, auth posture, risk grade, capabilities, recommended policy.
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