KosmoKrator

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Convex MCP Integration for LangGraph

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

7 functions 4 read 3 write Bearer token auth
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Connect Convex 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.

Convex MCP Config for LangGraph

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

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

Run the Gateway Manually

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

Why Use KosmoKrator Here

Scoped tools

Expose only Convex 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.

Convex Tools Visible to LangGraph

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

MCP toolSource functionTypeDescription
integration__convex__convex_list_tables convex.convex_list_tables Read List all tables in the Convex deployment.
integration__convex__convex_get_table convex.convex_get_table Read Get metadata and schema for a specific Convex table.
integration__convex__convex_query_documents convex.convex_query_documents Read Query documents from a Convex table with optional filtering and pagination.
integration__convex__convex_create_document convex.convex_create_document Write Create a new document in a Convex table.
integration__convex__convex_update_document convex.convex_update_document Write Update an existing document in a Convex table.
integration__convex__convex_delete_document convex.convex_delete_document Write Delete a document from a Convex table.
integration__convex__convex_get_current_user convex.convex_get_current_user Read Get the authenticated Convex user's profile information. Returns account details like name and email. Use this to verify API connectivity.

Related Convex Pages

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