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 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
Semantic screen found no manipulation pattern in the description. Conformance probe not yet run.
mcpindex.integrity.description
passINFOevidence“Normal capability description”via static_description
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- Semantic screen only - the deterministic conformance probe has not run on this server
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- Confidence is reported but not yet calibrated (v1)
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- Screen reads the tool description, not the live behavior
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- advisory
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- registry description only no input schema
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- screen model 8b
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- 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 →
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 →
Related: how to trust an MCP server · screen before install · 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.
<a href="https://mcpindex.ai/server/dev-smartergpt-lex">Independent trust record for Lex</a> - 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.
[](https://mcpindex.ai/server/dev-smartergpt-lex)
<a href="https://mcpindex.ai/server/dev-smartergpt-lex"><img src="https://mcpindex.ai/api/v1/badge/dev-smartergpt-lex" alt="mcpindex verdict" height="20" /></a>
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.
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