create_credential

A write tool on the n8n MCP server.

SERVERn8n MCP Server SOURCEandhit-r/n8n-mcp

Medium RISK CLASS

Category Write

Parameters 00 required

Recommended Rate-limitedsee the rule below

Registry record Grade F, identity unverified Pull the record →

This record as markdown: /tools/andhit-r-n8n-mcp/create-credential.md

WHAT IT DOES

What create_credential does on n8n MCP Server

AI agents use create_credential to create or update resources in n8n MCP Server, usually the action step of a workflow, after the agent has gathered context. Every call changes real data in your n8n MCP Server environment.

RISK

Why create_credential is rated Medium

Creating credentials is a Write operation (reversible data creation). However, the severity is elevated to 'high' rather than 'medium' because credentials store sensitive authentication material. Misuse by an AI agent could create unauthorized credentials enabling access to external systems, lateral movement, or privilege escalation within connected services.

From the tool's definition Tool name 'create_credential' indicates creation of authentication credentials. Server context shows 'management of n8n workflows, executions, credentials, tags, and variables'.

Attacks that exploit this kind of access

RECOMMENDED RULE

The rule that runs create_credential safely

PolicyLayer is an MCP gateway: it sits between your AI agents and n8n MCP Server, and checks every tool call against a rule you set before the call runs. Nothing changes on the server itself. For create_credential, this is the rule to start with:

create_credential Rate-limited

create_credential stays usable, but capped: an agent stuck in a loop can't make hundreds of changes a minute. Everything else on the server is denied unless you say otherwise.

View as policy code

policy.json

{
  "version": "1",
  "default": "deny",
  "tools": {
    "create_credential": {
      "limits": [
        {
          "counter": "create_credential_rate",
          "window": "minute",
          "max": 30,
          "scope": "grant"
        }
      ]
    }
  }
}

LIMIT THIS TOOL → Instant setup, no code required.

The button opens the PolicyLayer dashboard: create your workspace, connect n8n MCP Server, apply this rule, and every create_credential call is checked against it from then on.

FAQ

Questions about create_credential

What does the create_credential tool do? +

create_credential is a write tool on the n8n MCP Server MCP server. It is categorised as a Write tool in the n8n MCP Server MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.

How do I enforce a policy on create_credential? +

Register the n8n MCP Server MCP server in PolicyLayer and add a rule for create_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 MCP Server. Nothing to install.

What risk level is create_credential? +

create_credential is a Write tool with medium risk. Write tools should be rate-limited to prevent accidental bulk modifications.

Can I rate-limit create_credential? +

Yes. Add a rate_limit block to the create_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 create_credential completely? +

Set action: deny in the PolicyLayer policy for create_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 create_credential? +

create_credential is provided by the n8n MCP Server MCP server (andhit-r/n8n-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

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