KosmoKrator

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n8n MCP Integration for LangGraph

Connect n8n to LangGraph through the local KosmoKrator MCP gateway with scoped tools, credentials, and write policy.

7 functions 6 read 1 write API key auth
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Connect n8n to LangGraph

Run KosmoKrator integration calls from LangGraph nodes while preserving local credentials and permissions.

Use a graph node that calls the KosmoKrator CLI for deterministic steps or an MCP client for dynamic tool selection. The gateway is local, scoped to this integration, and starts with --write=deny so LangGraph can inspect read-capable tools without receiving write access by default.

n8n MCP Config for LangGraph

Headless CLI calls fit repeatable graph edges; MCP fits exploratory agent nodes.

{
  "mcpServers": {
    "kosmokrator-n8n": {
      "type": "stdio",
      "command": "kosmo",
      "args": [
        "mcp:serve",
        "--integration=n8n",
        "--write=deny"
      ]
    }
  }
}

Run the Gateway Manually

kosmokrator mcp:serve --integration=n8n --write=deny

Why Use KosmoKrator Here

Scoped tools

Expose only n8n instead of a broad multi-service tool list.

Local credentials

Reuse credentials already configured for the KosmoKrator CLI and Lua runtime.

Write policy

Start read-only, then opt into ask or allow for trusted workspaces.

n8n Tools Visible to LangGraph

LangGraph sees stable MCP tool names generated from the n8n integration catalog.

MCP toolSource functionTypeDescription
integration__n8n__n8n_list_workflows n8n.n8n_list_workflows Read List n8n workflows. Supports pagination with cursor and limit parameters.
integration__n8n__n8n_get_workflow n8n.n8n_get_workflow Read Get detailed information about a specific n8n workflow, including its nodes, connections, and settings.
integration__n8n__n8n_create_workflow n8n.n8n_create_workflow Write Create a new n8n workflow. Requires a name. Optionally define nodes, connections, and settings.
integration__n8n__n8n_list_executions n8n.n8n_list_executions Read List n8n workflow executions. Supports filtering by status and workflow ID, with pagination.
integration__n8n__n8n_get_execution n8n.n8n_get_execution Read Get detailed information about a specific n8n workflow execution, including status, data, and node results.
integration__n8n__n8n_list_credentials n8n.n8n_list_credentials Read List n8n credentials. Supports pagination with cursor and limit parameters.
integration__n8n__n8n_get_current_user n8n.n8n_get_current_user Read Get the authenticated n8n user's profile information, including name, email, and role.

Related n8n Pages

n8n CLIUse direct JSON commands instead of MCP discovery. n8n MCPFull gateway reference and MCP tool names. KosmoKrator for LangGraphClient-level gateway setup.