Memroach Server

Unkillable memory for AI agents. Your AI coding agent's memories, skills, and settings — synced across machines, searchable, and never lost.

What is MemRoach?

AI coding agents like Claude Code and Cursor store everything locally — memories, learned skills, project context, session history. Switch machines, and it's all gone. Reinstall, and you start from scratch.

MemRoach fixes this by backing your agent's memory to CockroachDB with automatic sync, semantic search, and a web dashboard to explore it all.

How it works: Your agent saves memories as files like normal. MemRoach automatically syncs them to CockroachDB in the background. When your agent needs to recall something, it searches across all your memories using semantic + keyword hybrid search — even memories saved on a different machine.

Features

Cross-Machine Sync

Push and pull agent memories between machines via CockroachDB. UUID-based machine identity, SHA-256 change detection, optimistic concurrency, and automatic conflict resolution for .md files. Auto-sync via Claude Code hooks — push on Stop, pull on first prompt.

Hybrid Search

Combines vector embeddings (OpenAI / Voyage AI) with keyword matching for search that understands meaning and catches exact terms. Scoring: 0.7 × vector + 0.3 × keyword.

Knowledge Graph

Link related memories with typed relationships — relates_to, supersedes, duplicates, caused_by, refines. Explore connections visually in the web UI.

Smart Context Priming

memroach_prime auto-loads the most relevant memories at session start, combining project relevance, recency, access frequency, and cross-machine changes.

Memory Decay & Compaction

Tracks every memory access. Identifies old, large, rarely-read memories and suggests compaction — the agent summarizes them and stores a compact version while preserving the original in version history.

Team Sharing

Per-memory visibility controls. Mark memories as team to share with colleagues, or keep them private (default).

Column-Level Encryption

Optional AES encryption for stored content using CockroachDB's native encrypt()/decrypt(). Backward-compatible — enable at any time without migrating existing data.

Web Dashboard

14-view SPA for browsing, searching, and analyzing your memory system. Includes insights (health, analytics, topic clusters, duplicates) and a social-media-style "Discover" feed for rediscovering old memories.

MCP Server

16-tool MCP server that works with any MCP-compatible client — Claude Code, Cursor, or any other agent.

Quick Start

git clone https://github.com/biplav-crl/memroach.git
cd memroach

Then run the interactive setup wizard from Claude Code:

/setup

The wizard walks you through everything — database connection, schema, MCP registration, auto-sync hooks, semantic search, and encryption. It handles both new database setup and connecting to an existing database (e.g., setting up a second machine).

Not using Claude Code? See Manual Setup below for step-by-step shell commands.

---

Architecture

┌──────────────┐  ┌──────────────┐  ┌──────────────┐
│ Claude Code  │  │   Cursor     │  │  Any MCP     │
│              │  │              │  │  Client       │
└──────┬───────┘  └──────┬───────┘  └──────┬───────┘
       │                 │                 │
       │  MCP            │  MCP            │  MCP
       ▼                 ▼                 ▼
┌─────────────────────────────────────────────────────┐
│  memroach_mcp_server.py (PRIMARY INTERFACE)         │
│  16 tools: search, store, graph, prime, compact...  │
└──────────────────────┬──────────────────────────────┘
                       │ pg8000 (TLS)
                       ▼
┌─────────────────────────────────────────────────────┐
│  CockroachDB (per-user accounts)                    │
│  ├── memroach_blobs (content-addressable, gzip+AES) │
│  ├── memroach_files (metadata + visibility + version)│
│  ├── memroach_embeddings (vector search)            │
│  ├── memroach_history (version changelog)           │
│  ├── memroach_links (knowledge graph)               │
│  ├── memroach_access (read tracking / decay)        │
│  └── memroach_log (audit trail)                     │
└─────────────────────────────────────────────────────┘
                       ▲
                       │ pg8000 (TLS)
┌──────────────────────┴──────────────────────────────┐
│  memroach_sync.py (CLAUDE CODE CONVENIENCE)         │
│  CLI: push, pull, status, search, history, share    │
│  Hooks: auto-push on Stop, auto-pull on Start       │
└─────────────────────────────────────────────────────┘
                       ▲
┌──────────────────────┴──────────────────────────────┐
│  memroach_daemon.py (BACKGROUND SYNC)               │
│  Polls for cross-machine changes, auto-pulls        │
└─────────────────────────────────────────────────────┘

CLI Reference

memroach init                          # Test DB connectivity, generate machine_id
memroach push                          # Upload changed files to DB
memroach push --force                  # Skip version checks (last-write-wins)
memroach push --dry-run                # Show what would be pushed
memroach pull                          # Download latest from all machines
memroach pull --force                  # Overwrite even if local is newer
memroach status                        # Show sync status
memroach diff                          # Detailed differences (alias: status -v)
memroach search "auth patterns"        # Hybrid semantic + keyword search
memroach history path/to/file.md       # Version changelog for a file
memroach share path/to/file --team     # Make a memory team-visible
memroach share path/to/file --private  # Restrict visibility

MCP Tools

Core

Tool	Description
memroach_search(query)	Hybrid vector + keyword search across all memories
memroach_get(file_path)	Fetch content of a specific memory/skill/config
memroach_store(path, content)	Store or update a memory directly
memroach_list(file_type, filter)	List entries, filterable by type and path pattern
memroach_share(path, visibility)	Change visibility (private/team)
memroach_team(query)	Search team-shared entries only
memroach_history(file_path)	Show version timeline with timestamps and operations

Knowledge Graph

Tool	Description
memroach_link(from, to, type)	Create a typed link between two memories
memroach_unlink(from, to)	Remove a link
memroach_graph(file_path)	Show all incoming and outgoing links for a memory

Link types: relates_to (bidirectional), duplicates, supersedes, caused_by, refines

Intelligence

Tool	Description
memroach_prime(project_hint)	Smart context priming — loads the most relevant memories for your session
memroach_context(topic)	Curated context bundle with full content for a specific topic
memroach_consolidate(threshold)	Find near-duplicate memories using embedding similarity
memroach_merge(paths, content)	Merge duplicates into one, with supersedes links
memroach_compact(max_age_days)	Find old, rarely-accessed memories for summarization
memroach_changes(since_minutes)	Check for recent changes from other machines

Web UI

Built-in web dashboard for browsing, searching, and analyzing your memory system. No extra dependencies — uses Starlette/uvicorn (already installed via mcp[cli]).

python memroach_web.py          # Starts on http://127.0.0.1:8080
python memroach_web.py --port 9090  # Custom port

Or use the Claude Code shortcut: /memroach_web

To make the shortcut available from any project (global scope):

cp /path/to/memroach/.claude/skills/memroach_web.md ~/.claude/skills/

Dashboard

Overview of your memory system — file counts by type, total storage, recent activity, and quick stats.

Browse

Paginated file browser with sorting by name, type, size, or sync date. Click any file to open the Memory Viewer with full content, version history, and knowledge graph links.

Search

Hybrid semantic + keyword search across all memories. Results show file path, type, size, and relevance score.

Knowledge Graph

Interactive D3.js force-directed graph visualization of all memory links. Nodes are color-coded by file type, edges labeled with relationship type.

Timeline

Chronological history of all memory operations (create, update, delete) across all files.

Team

Browse and search team-shared memories. Shows visibility status and allows filtering.

Compaction

Identifies old, large, rarely-accessed memories that are candidates for summarization.

Sync Status

Real-time view of sync state — last push/pull times, machine identity, pending changes, and daemon status.

Insights

Memory Health

Health report card with colored indicators for stale memories, orphaned files (no graph links), oversized files, version churn, and embedding coverage.

Growth & Activity Analytics

Daily activity charts showing creates, updates, and deletes over time. Includes machine activity breakdown and most-churned files.

Topic Clusters

K-means clustering on embedding vectors groups memories into topics. Each cluster shows an auto-generated label, file count, and representative files.

Duplicate Detection

Finds near-duplicate memories using embedding cosine similarity. Side-by-side comparison with merge button to consolidate directly from the UI.

Discover

Social-media-style feed that surfaces old, forgotten memories. Weighted random selection favors older and less-accessed files.

How Claude Uses MemRoach

MemRoach works transparently with Claude's existing memory system:

• Saving memories — Claude saves to ~/.claude/memory/ files as normal. Sync hooks automatically push to CockroachDB.
• Retrieving memories — Claude uses MCP tools (memroach_search, memroach_prime, memroach_context) for richer results than reading local files.
• Advanced features — Team sharing (memroach_share), knowledge graph links (memroach_link), duplicate consolidation (memroach_consolidate, memroach_merge).

See CLAUDE.md for the full decision guide.

How It Works

Cross-Machine Sync

Machine A (push) ──► CockroachDB ──► Machine B (pull)
     │                                    │
     │ UUID machine_id prevents           │ Conflict detection:
     │ hostname collisions                │ both changed → merge or .conflict
     │                                    │
     │ Auto-push on Stop/SessionEnd       │ Auto-pull on first prompt

• Push: only uploads files with changed SHA-256 hash, optimistic concurrency via version column
• Pull: fetches latest version across all machines, detects conflicts when both sides changed
• Merge: memory .md files get section-based auto-merge; other conflicts saved as .conflict

Context Priming

memroach_prime combines four signals to select the most relevant memories:

Signal	Weight	Description
Project match	2.0	Memories matching the project hint
Cross-machine changes	1.5	Recent updates from other devices
Recency	1.0	Recently modified memories
Access frequency	0.8	Most frequently read memories

File Type Classification

Files are auto-classified by path pattern:

Type	Path Pattern	Embedded?
memory	*/memory/*.md, CLAUDE.md	Yes
skill	*/skills/	Yes
config	settings.json, mcp.json	No
session	UUID directories	No
file	Everything else	No

Real-Time Sync Daemon

For continuous sync without hooks:

python memroach_daemon.py --daemonize --interval 60  # Poll every 60s
python memroach_daemon.py --status                    # Check if running
python memroach_daemon.py --stop                      # Stop daemon

Configuration Reference

memroach_config.json:

{
  "db_host": "your-cockroachdb-host",
  "db_port": 26257,
  "db_user": "your_username",
  "db_password": "",
  "db_name": "memroach",
  "db_sslrootcert": "/path/to/ca.crt",
  "machine_id": "",
  "auto_push_on_stop": true,
  "auto_push_on_session_end": true,
  "auto_pull_on_start": true,
  "embed_model": "text-embedding-3-small",
  "embed_api_key": "",
  "exclude_patterns": [],
  "max_file_size_mb": 50,
  "encryption_enabled": false,
  "encryption_key": ""
}

Key	Description
machine_id	Auto-generated UUID on first run. Do not share across machines.
embed_model	text-embedding-3-small (OpenAI) or voyage-3 (Voyage AI)
embed_api_key	Leave empty to disable hybrid search (keyword-only fallback)
encryption_enabled	Set to true to encrypt blob content and embedding text at rest
encryption_key	AES key (hex-encoded, 16/24/32 bytes). Leave empty when disabled.
auto_push_on_stop	Push changes when Claude stops responding (default: true)
auto_pull_on_start	Pull changes on first prompt of session (default: true)
exclude_patterns	File patterns to skip during sync
max_file_size_mb	Skip files larger than this (default: 50)

Database Schema

Table	Purpose
memroach_blobs	Content-addressable store (SHA-256, gzip, optional AES)
memroach_files	File metadata, type, visibility, version, per user+machine
memroach_embeddings	Vector embeddings (1024-dim) for semantic search
memroach_history	Version changelog — every push records a history entry
memroach_links	Knowledge graph edges (typed relationships)
memroach_access	Read tracking for memory decay scoring
memroach_log	Audit trail (push/pull operations)

User Management

MemRoach supports CockroachDB's built-in LDAP/OIDC integration for automatic user provisioning. For environments without an IdP, use memroach_admin.py:

python memroach_admin.py create-user alice
python memroach_admin.py list-users
python memroach_admin.py user-stats alice

Manual Setup

For users not using Claude Code, or who prefer manual configuration.

1. Install

git clone https://github.com/biplav-crl/memroach.git
cd memroach
python3 -m venv venv
source venv/bin/activate
pip install -r requirements.txt

2. Configure

cp memroach_config.json.example memroach_config.json

Edit memroach_config.json with your CockroachDB credentials:

{
  "db_host": "your-cockroachdb-host",
  "db_port": 26257,
  "db_user": "your_username",
  "db_password": "your_password",
  "db_name": "memroach",
  "db_sslrootcert": "/path/to/ca.crt"
}

3. Initialize

New database:

# Apply schema
cockroach sql --url "postgresql://user@host:26257/memroach?sslmode=verify-full" \
  < schema/memroach_schema.sql

# Test connectivity, generate machine_id
python memroach_sync.py init

# Upload your agent's memories
python memroach_sync.py push

Existing database (second machine):

# Copy memroach_config.json from your other machine, then clear machine_id
# (a new unique ID will be auto-generated)

# Test connectivity, generate machine_id
python memroach_sync.py init

# Download memories from the database
python memroach_sync.py pull

4. Register MCP Server

Add to your .mcp.json (Claude Code) or Cursor MCP config:

{
  "mcpServers": {
    "memroach": {
      "command": "/path/to/memroach/venv/bin/python",
      "args": ["memroach_mcp_server.py"],
      "cwd": "/path/to/memroach"
    }
  }
}

5. Auto-Sync Hooks (Optional)

Add to ~/.claude/settings.json:

{
  "hooks": {
    "UserPromptSubmit": [
      { "hooks": [{ "type": "command", "command": "/path/to/memroach/venv/bin/python /path/to/memroach/memroach_sync.py", "timeout": 15 }] }
    ],
    "Stop": [
      { "hooks": [{ "type": "command", "command": "/path/to/memroach/venv/bin/python /path/to/memroach/memroach_sync.py", "timeout": 10 }] }
    ],
    "SessionEnd": [
      { "hooks": [{ "type": "command", "command": "/path/to/memroach/venv/bin/python /path/to/memroach/memroach_sync.py", "timeout": 10 }] }
    ]
  }
}

Event	Action
UserPromptSubmit	Auto-pull once per session (first prompt only)
Stop	Auto-push in background after Claude responds
SessionEnd	Final push before session closes

The hook handler never crashes or blocks — exits cleanly on missing config, unreachable DB, or any error.

6. Semantic Search (Optional)

{
  "embed_model": "text-embedding-3-small",
  "embed_api_key": "sk-..."
}

Supports OpenAI (text-embedding-3-small) and Voyage AI (voyage-3).

7. Encryption (Optional)

python3 -c "import os; print(os.urandom(32).hex())"

{
  "encryption_enabled": true,
  "encryption_key": "your-64-char-hex-key"
}

Encrypts content_bytes and chunk_text at rest. Existing unencrypted data remains readable.

File Layout

memroach/
├── memroach_mcp_server.py      # MCP server (16 tools)
├── memroach_sync.py            # File sync client + CLI + hooks
├── memroach_daemon.py          # Background sync daemon
├── memroach_web.py             # Web UI dashboard (single-file SPA)
├── memroach_crypto.py          # Optional column-level encryption (AES)
├── memroach_embed.py           # Shared embedding module (OpenAI + Voyage)
├── memroach_admin.py           # User management (non-IdP fallback)
├── memroach_config.json        # Config (gitignored)
├── schema/
│   └── memroach_schema.sql     # CockroachDB DDL (7 tables)
├── docs/screenshots/           # Web UI screenshots
├── requirements.txt            # Python dependencies
├── .claude/skills/setup.md         # Interactive setup wizard
├── .claude/skills/memroach_web.md  # /memroach_web shortcut
└── README.md

Dependencies

• pg8000 — CockroachDB connection (direct, no Cloud Function)
• mcp[cli] — FastMCP server framework + Starlette/uvicorn (web UI)
• numpy — cosine similarity, k-means clustering
• openai — OpenAI embedding API (optional)
• voyageai — Voyage AI embedding API (optional)

License

MIT