Lex MCP Server

dev.smartergpt/lex

Repository Registry

What is the Lex MCP server?

Episodic memory, Frames, Policy Neighborhoods, and policy enforcement for AI agents.

How to install Lex

Copy-paste configuration for popular MCP clients.

transport: stdio

Config generated by PluginBench — verify against the source before use.

Environment / auth

LEX_WORKSPACE_ROOT
Project root directory for Lex runtime discovery. Defaults to current working directory.
LEX_STORE
Frame-store backend: sqlite or postgres. Defaults to sqlite unless LEX_DATABASE_URL selects PostgreSQL.
LEX_DB_PATH
Path to SQLite database file. Defaults to .smartergpt/lex/memory.db under the project root.
LEX_MEMORY_DB
Alias for LEX_DB_PATH (backwards compatibility). Same behavior.
LEX_DATABASE_URL
secret
PostgreSQL connection URL for the compatibility adapter. Treat as secret because it may contain credentials.
LEX_POSTGRES_PASSWORD
secret
PostgreSQL password supplied separately when LEX_DATABASE_URL omits one.
LEX_POSTGRES_POOL_MAX
Maximum PostgreSQL compatibility-adapter pool size. Defaults to 10.
LEX_DEBUG
Set to any value to enable debug logging to stderr.

~/Library/Application Support/Claude/claude_desktop_config.json

{
  "mcpServers": {
    "lex": {
      "command": "npx",
      "args": [
        "-y",
        "@smartergpt/lex-mcp"
      ],
      "env": {
        "LEX_WORKSPACE_ROOT": "<YOUR_LEX_WORKSPACE_ROOT>",
        "LEX_STORE": "<YOUR_LEX_STORE>",
        "LEX_DB_PATH": "<YOUR_LEX_DB_PATH>",
        "LEX_MEMORY_DB": "<YOUR_LEX_MEMORY_DB>",
        "LEX_DATABASE_URL": "<YOUR_LEX_DATABASE_URL>",
        "LEX_POSTGRES_PASSWORD": "<YOUR_LEX_POSTGRES_PASSWORD>",
        "LEX_POSTGRES_POOL_MAX": "<YOUR_LEX_POSTGRES_POOL_MAX>",
        "LEX_DEBUG": "<YOUR_LEX_DEBUG>"
      }
    }
  }
}

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