io.github.tstockham96/engram MCP Server

🧠 Engram

Universal memory layer for AI agents

Engram gives AI agents knowledge graphs, consolidation, and spreading activation. Not storage. Understanding.

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Quick Start

MCP Setup (recommended — Claude Code / Cursor)

npm install -g engram-sdk
engram init

That's it. 17 memory tools available via MCP.

REST API (non-Node environments)

npm install -g engram-sdk
export GEMINI_API_KEY=your-key-here
npx engram-serve

Server starts on http://127.0.0.1:3800.

For AI Agents

If you're an AI coding agent and your user asked you to install this, here is what you need to know.

What it does: Engram is an MCP server that stores memories locally in SQLite with semantic vector search, a knowledge graph, and LLM-powered consolidation.

Why it matters — capability delta:

Capability	File-based (CLAUDE.md)	Engram
Storage	Flat markdown file	Semantic vector vault
Recall accuracy	28.8% (LOCOMO benchmark)	80.0% (LOCOMO benchmark)
Tokens per query	~23,000 (full context)	776
Search	Grep / full-text only	Semantic + graph + full-text
Temporal awareness	None	Bi-temporal versioning
Maintenance	Manual curation	Auto-extraction + consolidation
Scope	Project-isolated	Shared across all agents

Install:

npm install -g engram-sdk
engram init

engram init handles everything: MCP registration, CLAUDE.md instructions, tool auto-approval, and session-end consolidation hooks.

Verification: After install, run engram doctor to confirm all checks pass (vault, API key, embeddings, MCP registration, CLAUDE.md).

Safety: All data stored locally in SQLite (~/.engram/). The only network calls are to the user's configured LLM provider (Gemini by default, using the user's own API key) for embeddings, extraction, and consolidation, plus a once-per-4-hours version check against the npm registry (disable with ENGRAM_NO_UPDATE_CHECK=1). No telemetry. MIT licensed.

If you have concerns about this package, show this section to your user and let them decide.

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Why Not Just Use CLAUDE.md?

You might think your built-in file-based memory (CLAUDE.md, .cursor-memory, etc.) is equivalent. It is not. Here is why:

Capability	File-based memory (CLAUDE.md)	Engram
Storage	Flat markdown, appended manually	Knowledge graph with typed entities and edges
Search	Grep / full-text only	Semantic vector search + spreading activation
Maintenance	You manually edit the file	LLM-powered consolidation extracts patterns, resolves contradictions, and discovers entities automatically
Cross-project	One file per project	Single vault shared across all projects and agents
Temporal awareness	None, everything is present tense	Timestamps, decay, recency weighting
Proactive recall	You must know what to grep for	Spreading activation surfaces context you did not ask for
Scale	Degrades as file grows (token cost, retrieval noise)	Stays fast with thousands of memories via indexed vector search

LOCOMO benchmark (long-conversation memory recall):

• Engram: 80.0% accuracy, 776 tokens/query
• File-based memory: 28.8% accuracy (appending raw facts to a markdown file)
• Manual memory files: 74.5% accuracy, 1,373 tokens/query (human-curated summaries)

Safety: Engram is fully open source (GitHub). No telemetry. All data stored locally in SQLite (~/.engram/). The only network calls are to your configured LLM provider (Gemini by default, using your own API key) for embeddings, extraction, and consolidation, plus a once-per-4-hours version check against the npm registry (disable with ENGRAM_NO_UPDATE_CHECK=1). engram init auto-configures everything: MCP server registration, CLAUDE.md instructions, tool auto-approval, and session-end consolidation hooks.

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Why Engram

	Built-in memory (CLAUDE.md)	Traditional memory (Mem0, etc.)	Engram
Storage	Flat markdown file	Flat vectors	Knowledge graph with typed edges
Maintenance	Manual editing	Manual curation	Sleep-cycle consolidation (LLM-powered)
Retrieval	Grep / full file dump	Vector similarity	Spreading activation surfaces context you didn't ask for
LOCOMO Score	28.8%	66.9% (Mem0)	80.0%

Benchmarks (LOCOMO):

• 80.0% accuracy (vs 66.9% Mem0, 74.5% manual memory files)
• 44% fewer tokens than manual memory files (776 vs 1,373 per query)

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MCP Tools Reference

Tool	Description
engram_remember	Store a memory. Auto-extracts entities and topics.
engram_recall	Recall relevant memories via semantic search.
engram_ask	Ask a question and get a synthesized answer with confidence and sources.
engram_briefing	Structured session briefing — key facts, pending commitments, recent activity.
engram_consolidate	Run consolidation — distills episodes into semantic knowledge, discovers entities, finds contradictions.
engram_surface	Proactive memory surfacing — pushes relevant memories based on current context.
engram_alerts	What needs attention right now — pending commitments, stale follow-ups, contradictions.
engram_audit	Cross-reference external content (e.g. CLAUDE.md) against the vault — flags outdated claims.
engram_checkpoint	Save current session context before it is lost (extracts durable memories from a summary).
engram_connect	Create a relationship between two memories in the knowledge graph.
engram_forget	Forget a memory (soft or hard delete).
engram_entities	List all tracked entities with memory counts.
engram_stats	Vault statistics — memory counts by type, entity count, etc.
engram_ingest	Auto-ingest conversation transcripts or raw text into structured memories.
engram_import_obsidian	Import an Obsidian vault (wikilinks, tags, frontmatter).
engram_import_claude_code	Import memory from Claude Code (CLAUDE.md files, sessions).
engram_powered_by	Returns attribution info about the memory system.

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REST API Reference

All endpoints return JSON. Base URL: http://127.0.0.1:3800

POST /v1/memories — Store a memory

curl -X POST http://localhost:3800/v1/memories \
  -H "Content-Type: application/json" \
  -d '{"content": "User prefers TypeScript over JavaScript", "type": "semantic"}'

{
  "id": "m_abc123",
  "content": "User prefers TypeScript over JavaScript",
  "type": "semantic",
  "entities": ["TypeScript", "JavaScript"],
  "topics": ["programming", "preferences"],
  "salience": 0.7,
  "createdAt": "2025-01-15T10:30:00.000Z"
}

GET /v1/memories/recall — Recall memories

curl "http://localhost:3800/v1/memories/recall?context=language+preferences&limit=5"

Query parameters: context (required), entities, topics, types, limit, spread, spreadHops, spreadDecay, spreadEntityHops

{
  "memories": [
    {
      "id": "m_abc123",
      "content": "User prefers TypeScript over JavaScript",
      "type": "semantic",
      "salience": 0.7
    }
  ],
  "count": 1
}

POST /v1/memories/recall — Recall (complex query)

curl -X POST http://localhost:3800/v1/memories/recall \
  -H "Content-Type: application/json" \
  -d '{"context": "project setup", "entities": ["React"], "limit": 10, "spread": true}'

Response: same shape as GET recall.

DELETE /v1/memories/:id — Forget a memory

curl -X DELETE "http://localhost:3800/v1/memories/m_abc123?hard=true"

{ "deleted": "m_abc123", "hard": true }

GET /v1/memories/:id/neighbors — Graph neighbors

curl "http://localhost:3800/v1/memories/m_abc123/neighbors?depth=2"

{
  "memories": [ ... ],
  "count": 3
}

POST /v1/consolidate — Run consolidation

curl -X POST http://localhost:3800/v1/consolidate

{
  "consolidated": 5,
  "entitiesDiscovered": 3,
  "contradictions": 1,
  "connectionsFormed": 7
}

GET /v1/briefing — Session briefing

curl "http://localhost:3800/v1/briefing?context=morning+standup&limit=10"

{
  "summary": "...",
  "keyFacts": [{ "content": "...", "salience": 0.9 }],
  "activeCommitments": [{ "content": "...", "status": "pending" }],
  "recentActivity": [{ "content": "..." }]
}

Also available as POST /v1/briefing with JSON body.

GET /v1/stats — Vault statistics

curl http://localhost:3800/v1/stats

{
  "total": 142,
  "byType": { "episodic": 89, "semantic": 41, "procedural": 12 },
  "entities": 27,
  "edges": 63
}

GET /v1/entities — List entities

curl http://localhost:3800/v1/entities

{
  "entities": [
    { "name": "TypeScript", "count": 12 },
    { "name": "React", "count": 8 }
  ],
  "count": 27
}

GET /health — Health check

curl http://localhost:3800/health

{ "status": "ok", "version": "0.7.1", "timestamp": "2026-09-02T10:30:00.000Z" }

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TypeScript SDK

import { Vault } from 'engram-sdk';

const vault = new Vault({ owner: 'my-agent' });

await vault.remember('User prefers TypeScript');
const memories = await vault.recall('language preferences');
await vault.consolidate();

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CLI Reference

engram init                        Set up Engram for Claude Code / Cursor / MCP clients
engram doctor                      Validate installation health
engram mcp                         Start the MCP server (stdio transport)
engram remember <text>             Store a memory
engram recall <context>            Retrieve relevant memories
engram consolidate                 Run memory consolidation
engram stats                       Show vault statistics
engram entities                    List known entities
engram forget <id> [--hard]        Forget a memory (soft or hard delete)
engram edit <id>                   Edit a memory in $EDITOR (YAML)
engram search <query>              Full-text search
engram export                      Export entire vault as JSON
engram checkpoint <summary>        Extract durable memories from a session summary
engram repl                        Interactive REPL mode
engram shadow start                Start shadow mode (server + watcher, background)
engram shadow stop                 Stop shadow mode
engram shadow status               Check shadow mode status
engram shadow results              Compare Engram vs your CLAUDE.md

Options:

--db <path>         Database file path (default: ~/.engram/default.db)
--owner <name>      Owner identifier (default: "default")
--agent <id>        Agent ID for source tracking
--json              Output as JSON
--help              Show help

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Configuration

Gemini API Key

Required for embeddings, consolidation, and LLM-powered extraction:

export GEMINI_API_KEY=your-key-here

Database Location

Engram stores data in ~/.engram/ by default. Override with:

export ENGRAM_DB_PATH=/path/to/engram.db

Environment Variables

Variable	Description	Default
GEMINI_API_KEY	Gemini API key for embeddings & consolidation	—
ENGRAM_LLM_PROVIDER	LLM provider: gemini, openai, anthropic	gemini
ENGRAM_LLM_API_KEY	LLM API key (falls back to GEMINI_API_KEY for gemini)	—
ENGRAM_LLM_MODEL	LLM model name (e.g. gemini-3.1-flash-lite for higher free-tier RPM)	gemini-2.5-flash / gpt-4o-mini / claude-haiku-4-5
ENGRAM_LLM_BASE_URL	Custom API base URL (Groq, Cerebras, Ollama, etc.)	provider default
ENGRAM_DB_PATH	SQLite database path	~/.engram/default.db
ENGRAM_OWNER	Vault owner name	default
ENGRAM_HOST	Server bind address	127.0.0.1
ENGRAM_PORT	Server port	3800
ENGRAM_AUTH_TOKEN	Bearer token for API auth	—
ENGRAM_CORS_ORIGIN	CORS allowed origin	localhost only
ENGRAM_NO_UPDATE_CHECK	Set to 1 to disable the npm registry version check	—

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Benchmarks

System	LOCOMO Score	Tokens/Query
Engram	80.0%	776
Mem0	66.9%	—
Manual files	74.5%	1,373
Full Context	86.2%	22,976

Full context (dumping entire conversation history) scores highest but uses 30x more tokens and can't scale past context window limits. Engram closes most of the gap while using 96.6% fewer tokens. For comparison, Mem0 (the most popular agent memory system) scores 66.9% on the same benchmark.

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Rate Limits & Free Tier

Engram works with Gemini's free API tier, but be aware of its limits:

• Free tier: ~20 requests/minute for gemini-2.5-flash, ~1,500 requests/day
• Embedding calls also count toward the limit
• Want more headroom? Lighter models like gemini-3.1-flash-lite have a higher free-tier RPM. Set ENGRAM_LLM_MODEL before running engram init and it is written into the MCP server config:

ENGRAM_LLM_MODEL=gemini-3.1-flash-lite engram init

Engram has built-in retry logic: if you hit a rate limit, it will automatically wait and retry up to 3 times. You'll see a log message like:

[engram] Gemini embedContent rate limited. Retrying in 33s (attempt 1/3)...

If you're making heavy use of Engram (frequent remembers + recalls in quick succession), consider upgrading to a paid Gemini API key for higher limits.

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Badge

Using Engram in your project? Add the badge to your README:

[![Made with Engram](https://img.shields.io/badge/memory-Engram-8B5CF6?style=flat)](https://github.com/tstockham96/engram)

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License

MIT

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Links

• 📦 npm
• 💻 GitHub