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Clerk MCP Integration for LangGraph

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

7 functions 4 read 3 write API key auth
Submit Clerk feedback View package source

Connect Clerk 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.

Clerk MCP Config for LangGraph

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

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

Run the Gateway Manually

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

Why Use KosmoKrator Here

Scoped tools

Expose only Clerk 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.

Clerk Tools Visible to LangGraph

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

MCP toolSource functionTypeDescription
integration__clerk__clerk_list_users clerk.clerk_list_users Read List users from Clerk with optional filtering and pagination. Returns user IDs, emails, names, and profile details.
integration__clerk__clerk_get_user clerk.clerk_get_user Read Retrieve a single Clerk user by their user ID. Returns full profile details including email, name, and metadata.
integration__clerk__clerk_create_user clerk.clerk_create_user Write Create a new user in Clerk. Requires at least one email address. Optionally set name, password, and username.
integration__clerk__clerk_update_user clerk.clerk_update_user Write Update an existing Clerk user's profile. Provide the user ID and fields to update.
integration__clerk__clerk_delete_user clerk.clerk_delete_user Write Delete a user from Clerk. This action is irreversible and will remove all associated data.
integration__clerk__clerk_list_organizations clerk.clerk_list_organizations Read List organizations from Clerk with optional filtering and pagination. Returns organization IDs, names, and metadata.
integration__clerk__clerk_get_current_user clerk.clerk_get_current_user Read Health check — verify Clerk API connectivity by fetching the first user. Returns a single user or empty result to confirm the API is reachable.

Related Clerk Pages

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