KosmoKrator

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Fauna MCP Integration for LangGraph

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

7 functions 5 read 1 write API token auth
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Connect Fauna 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.

Fauna MCP Config for LangGraph

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

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

Run the Gateway Manually

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

Why Use KosmoKrator Here

Scoped tools

Expose only Fauna 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.

Fauna Tools Visible to LangGraph

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

MCP toolSource functionTypeDescription
integration__fauna__fauna_list_databases fauna.fauna_list_databases Read List all databases in the current Fauna context. Returns database names and their metadata including creation time and references.
integration__fauna__fauna_get_database fauna.fauna_get_database Read Get details of a specific Fauna database by name. Returns database metadata including name, reference, creation time, and configured options.
integration__fauna__fauna_create_database fauna.fauna_create_database Write Create a new Fauna database. Provide a database name and optional configuration. Requires a server or admin key. Returns the created database metadata.
integration__fauna__fauna_query_fql fauna.fauna_query_fql action Execute a Fauna Query Language (FQL) expression. Provide the query as a JSON-encoded FQL expression. Supports all FQL operations including document reads, writes, indexes, and complex queries.
integration__fauna__fauna_list_collections fauna.fauna_list_collections Read List all collections in the current Fauna database. Returns collection names and their metadata including references and creation time.
integration__fauna__fauna_get_collection fauna.fauna_get_collection Read Get details of a specific Fauna collection by name. Returns collection metadata including name, reference, creation time, and configured options.
integration__fauna__fauna_get_current_user fauna.fauna_get_current_user Read Get the current authenticated Fauna key identity. Verifies the configured bearer token and returns the associated key identity information.

Related Fauna Pages

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