# Lex (dev.smartergpt/lex@4.0.4) > Source: > Published: 2026-08-29 23:35:46+00:00 [← Index](/leaderboard) # Lex Episodic memory, Frames, Policy Neighborhoods, and policy enforcement for AI agents. The current version, v4.0.4, was published to the official MCP registry on 2026-08-29. It is distributed as @smartergpt/lex-mcp on npm, filed under Memory & RAG by this index, and declares 8 environment variables. Removals and unreachable sources are measured across every server this index tracks, contract drift across the servers that answer in consecutive snapshots; [the index's current counts](/stats) put this record in context. ## Using Lex in Claude, Cursor, Gemini CLI, Cline, or Zed? MCP tool contracts can change remotely with no version bump. The mcpindex gate pins each contract and **HOLDs the call** when it drifts-before your agent acts. Zero credentials. This is not the package install for this server itself (use **Install this server** for that). Rewrites your MCP host config so each server launches behind the gate. Inspect first: curl -fsSL https://mcpindex.ai/install.sh | less ``` uv tool install mcpindex-gate && mcpindex-config-wire ``` [method](/methodology) Semantic screen found no manipulation pattern in the description. Conformance probe not yet run. `mcpindex.integrity.description` passINFOevidence“Normal capability description”via static_description - - Semantic screen only - the deterministic conformance probe has not run on this server - - Confidence is reported but not yet calibrated (v1) - - Screen reads the tool description, not the live behavior - - advisory - - registry description only no input schema - - screen model 8b - - The registry listing (version, packages, links) changed after this screen ran - the description we assessed did not Semantic screen: an LLM judge reads the tool description for hidden instructions (status PARTIAL). A pass means the description is not lying, not that the tool is safe: a high-capability tool with an honest description still warrants caution. The deterministic conformance probe has not been run on this server yet, so the screen here is semantic-only. Posture: advisory. Confidences are reported but not yet calibrated (calibrated=false at v1). Full verdict history is not shown on this page. Own this server? [Screen its description →](/screen) ## That verdict was true at screening time (snapshot 2026-08-30). Contracts can change after screening, with no version bump. The gate pins Lex’s tool contracts on first sight and holds any silent change before your agent acts - the check that keeps being true on Tuesday. [See your first HOLD in 2 minutes →](/guides/install-the-gate-first-hold) Related: [how to trust an MCP server](/guides/how-to-trust-an-mcp-server) · [screen before install](/guides/screen-mcp-server-before-install) · [silent contract drift](/guides/mcp-silent-contract-drift) People vet a server before wiring it in. One line on your project site or docs answers that with an independent record: screening verdict, registry provenance, contract drift history. It stays current as new screens and drift events land. ``` [Independent trust record for Lex](https://mcpindex.ai/server/dev-smartergpt-lex) - screening verdict, registry provenance, and contract drift monitoring. Independent trust record for Lex - screening verdict, registry provenance, and contract drift monitoring. ``` A live verdict badge for your README or listing. It reflects the current screen, links back here, and updates when the verdict does. ``` [![mcpindex](https://mcpindex.ai/api/v1/badge/dev-smartergpt-lex)](https://mcpindex.ai/server/dev-smartergpt-lex) mcpindex verdict ``` `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` PostgreSQL connection URL for the compatibility adapter. Treat as secret because it may contain credentials. `LEX_POSTGRES_PASSWORD` 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. [methodology](/methodology) [Fodda Knowledge Graphsai.fodda/mcp-server](/server/ai-fodda-mcp-server) Expert-curated knowledge, brand, research & earnings intelligence — 47 tools, 220+ graphs. [Achriomcom.achriom/achriom](/server/com-achriom-achriom) Media memory for AI agents and their humans: books, movies, music, shows, anime, podcasts, games. [Brainboxdev.thexi/brainbox](/server/dev-thexi-brainbox) Persistent, portable memory for AI assistants — your private memory graph, from any MCP client.