KosmoKrator

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Neon MCP Integration for LangChain

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

7 functions 6 read 1 write Bearer token auth
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Connect Neon 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.

Neon MCP Config for LangChain

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

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

Run the Gateway Manually

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

Why Use KosmoKrator Here

Scoped tools

Expose only Neon 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.

Neon Tools Visible to LangChain

LangChain sees stable MCP tool names generated from the Neon integration catalog.

MCP toolSource functionTypeDescription
integration__neon__neon_list_projects neon.neon_list_projects Read List all Neon projects in the organization. Returns project IDs, names, region, and status.
integration__neon__neon_get_project neon.neon_get_project Read Get details for a specific Neon project by ID. Returns full project information including connection strings, branches, and settings.
integration__neon__neon_create_project neon.neon_create_project Write Create a new Neon project. Requires a name. Optionally specify a region and Postgres version.
integration__neon__neon_list_branches neon.neon_list_branches Read List all branches in a Neon project. Returns branch IDs, names, status, and parent branch info.
integration__neon__neon_get_branch neon.neon_get_branch Read Get details for a specific branch in a Neon project. Returns branch configuration, endpoints, and state.
integration__neon__neon_list_databases neon.neon_list_databases Read List all databases in a Neon project branch. Returns database names, owners, and sizes.
integration__neon__neon_get_current_user neon.neon_get_current_user Read Get information about the current authenticated Neon user, including email, name, and organization membership.

Related Neon Pages

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