Engram: Open-source memory layer for Claude Code and MCP clients

What Engram is

Engram is an intelligent memory layer built using Claude Code that functions as an MCP (Model Context Protocol) server compatible with any MCP client. It's free and open-source under the AGPL license.

How it differs from Claude's native auto memory

Anthropic recently launched auto memory for Claude Code, which validates the need for persistent memory in agents. However, Engram offers several key differences:

• No cap: Stores unlimited memories with semantic vector search (only retrieves relevant content)
• 96% fewer tokens: Uses approximately 800 tokens per query versus 5K+ for loading an entire markdown file
• Higher accuracy: Achieves 80% accuracy on the LOCOMO benchmark (standard memory benchmark from Snap Research) versus 29% for flat-file approaches
• Cross-project: One vault across all projects, not siloed per repository
• Intelligence layer: Includes automatic extraction, consolidation, contradiction detection, and bi-temporal recall
• Client compatibility: Works with any MCP client, not locked to Claude Code

Claude's native system writes markdown files with a 200-line cap (approximately 5K tokens loaded every session) and operates per-project without semantic search.

Technical implementation

Behind the scenes, Engram uses:

• SQLite + sqlite-vec for vector search
• Knowledge graph for entity relationships
• LLM-powered consolidation that produces insights rather than just storage

Core functions

Your agent interacts with Engram through these primary calls:

• engram_remember: Store memories
• engram_recall: Retrieve memories

Additional MCP tools

• engram_ask: Question answering
• engram_consolidate: Merge related memories
• engram_audit: Cross-reference external content
• engram_briefing: Session start context

Getting started

Installation takes about 2 minutes:

npm install -g engram-sdk
engram init

This auto-detects Claude Code and Cursor, writes the MCP configuration, and creates your vault.

Availability

Engram is listed in the official MCP Registry as io.github.tstockham96/engram.