Episodic memory, Frames, Policy Neighborhoods, and policy enforcement for AI agents.
To add Lex to Claude, run the install command below or copy the ready-made config for Claude Code, Claude Desktop, Cursor and VS Code further down. Restart your client after adding it and its tools show up in your next conversation. It needs 8 environment variables, listed below.
Install
npx -y @smartergpt/lex-mcp@4.4.4Environment variables
LEX_WORKSPACE_ROOTSet in your MCP configLEX_STORESet in your MCP configLEX_DB_PATHSet in your MCP configLEX_MEMORY_DBSet in your MCP configLEX_DATABASE_URLSet in your MCP configLEX_POSTGRES_PASSWORDSet in your MCP configLEX_POSTGRES_POOL_MAXSet in your MCP configLEX_DEBUGSet in your MCP configInstall with your client
claude mcp add lex --env LEX_WORKSPACE_ROOT=<YOUR_LEX_WORKSPACE_ROOT> --env LEX_STORE=<YOUR_LEX_STORE> --env LEX_DB_PATH=<YOUR_LEX_DB_PATH> --env LEX_MEMORY_DB=<YOUR_LEX_MEMORY_DB> --env LEX_DATABASE_URL=<YOUR_LEX_DATABASE_URL> --env LEX_POSTGRES_PASSWORD=<YOUR_LEX_POSTGRES_PASSWORD> --env LEX_POSTGRES_POOL_MAX=<YOUR_LEX_POSTGRES_POOL_MAX> --env LEX_DEBUG=<YOUR_LEX_DEBUG> -- npx -y @smartergpt/lex-mcp@4.4.4
Run this in a terminal to add the server to Claude Code.
What this does
Lex exposes a set of tools to Claude over the Model Context Protocol. After you add it to claude_desktop_config.json (snippet above) and restart Claude Desktop, those tools become callable inside any conversation.
Requirements
This server needs the following environment variables to be set before it can run:
LEX_WORKSPACE_ROOT LEX_STORE LEX_DB_PATH LEX_MEMORY_DB LEX_DATABASE_URL LEX_POSTGRES_PASSWORD LEX_POSTGRES_POOL_MAX LEX_DEBUG
Set these via the env object in your MCP config (see claude_desktop_config.json snippet above).
Frequently asked questions
How do I install Lex?
Run the Claude Code command in the install section to add Lex to Claude Code, or copy the ready-made config for your client from the install section on this page. Restart your client afterwards and the tools appear in your next conversation.
Which clients work with Lex?
This page carries setup and config for Claude Code, Claude Desktop, Cursor and VS Code. Any other MCP client that accepts a standard server config can connect to Lex as well.
Does Lex need an API key?
Yes. Before it can run, set these environment variables: LEX_WORKSPACE_ROOT, LEX_STORE, LEX_DB_PATH, LEX_MEMORY_DB, LEX_DATABASE_URL, LEX_POSTGRES_PASSWORD, LEX_POSTGRES_POOL_MAX, LEX_DEBUG. They go in the env block of your MCP config.
Imported from the Official MCP Registry. The details above come from the registry entry; the maker can claim this listing to correct them, add docs, and see its traffic.
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