delete_credential

THE RISK

Critical Risk

Why delete_credential needs a policy

Deleting a credential is an irreversible operation that destroys stored authentication/configuration data and breaks any workflows relying on it. This meets the Destructive category definition (irreversibly deletes data). Severity is high because credential deletion affects workflow functionality and potentially multiple workflows, though the blast radius is limited to credentials rather than production data.

From the tool's definition Tool description explicitly states 'Delete a credential by ID' and warns 'this action cannot be undone.' The tool name contains 'delete' and the description confirms irreversible removal of a credential resource.

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

POLICY

How to control delete_credential

PolicyLayer is an MCP gateway — it sits between your AI agents and n8n Workflow Builder MCP Server, and nothing reaches the server without passing your rules. This is the rule we recommend for delete_credential:

policy.json

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

delete_credential 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 n8n Workflow Builder 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

Related tools and policies

More n8n Workflow Builder MCP Server tools

Destructive delete_execution Delete a workflow execution record from the n8n instance Destructive delete_tag Remove unused tags from the system Destructive delete_workflow Delete an n8n workflow Destructive remove_node Remove a node from a workflow (also removes its connections) Execute execute_workflow Trigger immediate execution of a workflow by its ID. Starts the workflow manually regardle Execute activate_workflow Activate an n8n workflow Execute create_workflow_and_activate Create and activate an n8n workflow Write add_node Add a single node to an existing workflow

All 34 n8n Workflow Builder MCP Server tools →

Destructive tools on other servers

Android Forensics ADB MCP Server create_full_backup 0xarchive web3_revoke_key Frida Game Hacking MCP clear_scan cPanel MCP Server clear_spam_box

Go deeper

Critical-risk tools in n8n Workflow Builder 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.
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 delete_credential

What does the delete_credential tool do? +

Delete a credential by ID. This will remove the credential and make it unavailable for workflows. Use with caution as this action cannot be undone. It is categorised as a Destructive tool in the n8n Workflow Builder 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_credential? +

Register the n8n Workflow Builder MCP Server MCP server in PolicyLayer and add a rule for delete_credential: 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 Workflow Builder MCP Server. Nothing to install.

What risk level is delete_credential? +

delete_credential 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_credential? +

Yes. Add a rate_limit block to the delete_credential 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_credential completely? +

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

delete_credential is provided by the n8n Workflow Builder MCP Server MCP server (makafeli/n8n-workflow-builder). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

Enforce policy on every n8n Workflow Builder MCP Server tool call.

Start from n8n Workflow Builder MCP Server, add the rest of your stack, and see everything your agents can call. Then put policy on all of it.

CHECK YOUR STACK →