KosmoKrator

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Convex MCP Integration for LangChain

Connect Convex to LangChain 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 LangChain

Bridge LangChain agents to local KosmoKrator integration tools through MCP or headless CLI calls.

Use the MCP gateway when the agent should discover tools, or wrap kosmo integrations:call for fixed chains. The gateway is local, scoped to this integration, and starts with --write=deny so LangChain can inspect read-capable tools without receiving write access by default.

Convex MCP Config for LangChain

Keep the gateway scoped to the integration and operation class needed by the chain.

{
  "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 LangChain

LangChain 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 LangChainClient-level gateway setup.