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Built for Claude AI, LLMs, and multi-agent systems.\n\n**Drop-in replacement for `@modelcontextprotocol/server-memory` with zero data loss.**\n\n## Table of Contents\n\n- [Why This Package?](#why-this-package)\n- [Features](#features)\n- [Installation](#installation)\n- [Quick Start](#quick-start)\n- [Configuration](#configuration)\n- [Usage Examples](#usage-examples)\n- [API Reference](#api-reference)\n- [Performance](#performance)\n- [Troubleshooting](#troubleshooting)\n- [Security](#security)\n- [Migration Guide](#migration-from-server-memory)\n- [FAQ](#faq)\n- [Contributing](#contributing)\n- [License](#license)\n\n## Why This Package?\n\nThe official `@modelcontextprotocol/server-memory` uses JSONL files without file locking, which can lead to:\n\n- **Race conditions** when multiple sessions access the same memory file\n- **Data corruption** under concurrent write operations\n- **Lost updates** when parallel agents write simultaneously\n\nThis package solves these issues by using **SQLite with WAL (Write-Ahead Logging)** mode:\n\n| Feature | server-memory | mcp-memory-sqlite |\n|---------|---------------|-------------------|\n| Storage | JSONL (text file) | SQLite database |\n| Concurrent reads | Limited | Unlimited |\n| Concurrent writes | Race conditions | Safe (WAL mode) |\n| Lock contention | No handling | 5s timeout with retry |\n| Data integrity | No guarantees | ACID transactions |\n| Multiple sessions | Problematic | Fully supported |\n| Crash recovery | Manual repair | Automatic (WAL) |\n| Search performance | O(n) scan | O(log n) indexed |\n\n### Real-World Impact\n\n| Your Workflow | server-memory Risk | mcp-memory-sqlite Protection |\n|---------------|-------------------|------------------------------|\n| Multiple Claude Desktop sessions | Overwrite conflicts | Concurrent writes queued |\n| Parallel agent automation | Lost updates | Transaction isolation |\n| Long-running background agents | File corruption on crash | WAL recovery on restart |\n| Team sharing one memory file | Race conditions | ACID guarantees |\n\n## Features\n\n- **Thread-Safe Concurrent Access** - Multiple sessions can read/write simultaneously without data corruption\n- **ACID Transactions** - Guaranteed data integrity with SQLite's transaction support\n- **WAL Mode** - Write-Ahead Logging enables unlimited concurrent reads while writing\n- **Drop-in Replacement** - API-compatible with `@modelcontextprotocol/server-memory`\n- **Zero Lock Contention** - 5-second busy timeout with automatic retry handling\n- **Knowledge Graph API** - Entity, observation, and relation management\n- **Fast & Efficient** - Powered by `better-sqlite3` for optimal performance\n- **TypeScript Support** - Full type definitions included\n\n### Use Cases\n\n- **Multi-agent AI systems** requiring shared memory\n- **Claude Code** with multiple concurrent sessions\n- **Development environments** with parallel testing\n- **Production AI applications** needing reliable persistence\n- **Knowledge graph** storage with relational integrity\n\n## Installation\n\n```bash\nnpm install @pepk/mcp-memory-sqlite\n```\n\n## Quick Start\n\nGet up and running in 30 seconds:\n\n```bash\n# Use directly with npx (no installation needed)\nnpx @pepk/mcp-memory-sqlite\n\n# Or install globally\nnpm install -g @pepk/mcp-memory-sqlite\n```\n\n## Configuration\n\n### With Claude Code\n\nAdd to your `~/.claude.json`:\n\n```json\n{\n  \"mcpServers\": {\n    \"memory\": {\n      \"type\": \"stdio\",\n      \"command\": \"npx\",\n      \"args\": [\"@pepk/mcp-memory-sqlite\"],\n      \"env\": {\n        \"MEMORY_DB_PATH\": \"./.claude/memory.db\"\n      }\n    }\n  }\n}\n```\n\n### With Claude Desktop\n\nAdd to your Claude Desktop configuration:\n\n```json\n{\n  \"mcpServers\": {\n    \"memory\": {\n      \"command\": \"npx\",\n      \"args\": [\"@pepk/mcp-memory-sqlite\"],\n      \"env\": {\n        \"MEMORY_DB_PATH\": \"/path/to/your/memory.db\"\n      }\n    }\n  }\n}\n```\n\n### Environment Variables\n\n| Variable | Description | Default |\n|----------|-------------|---------|\n| `MEMORY_DB_PATH` | Path to SQLite database file | `./memory.db` in package directory |\n\n## Usage Examples\n\n### Building a Project Knowledge Graph\n\n```typescript\n// Create entities for your project structure\nawait create_entities({\n  entities: [\n    {\n      name: \"UserService\",\n      entityType: \"Service\",\n      observations: [\n        \"Handles user authentication\",\n        \"Located in src/services/user.ts\",\n        \"Uses bcrypt for password hashing\"\n      ]\n    },\n    {\n      name: \"DatabaseService\",\n      entityType: \"Service\",\n      observations: [\n        \"Manages PostgreSQL connections\",\n        \"Uses connection pooling\"\n      ]\n    }\n  ]\n});\n\n// Create relationships\nawait create_relations({\n  relations: [\n    {\n      from: \"UserService\",\n      to: \"DatabaseService\",\n      relationType: \"depends_on\"\n    }\n  ]\n});\n```\n\n### Conversation Memory\n\n```typescript\n// Track user preferences across conversations\nawait create_entities({\n  entities: [\n    {\n      name: \"user_preferences\",\n      entityType: \"UserContext\",\n      observations: [\n        \"Prefers concise explanations\",\n        \"Working on a RAG project\",\n        \"Uses TypeScript primarily\"\n      ]\n    }\n  ]\n});\n\n// Later, retrieve context\nconst result = await open_nodes({\n  names: [\"user_preferences\"]\n});\n```\n\n### Search and Discovery\n\n```typescript\n// Find entities related to authentication\nconst results = await search_nodes({\n  query: \"authentication\"\n});\n// Returns: UserService, OAuth2Provider, etc.\n```\n\n## API Reference\n\nThis server provides the same Knowledge Graph API as the official memory server:\n\n### Entity Management\n\n| Tool | Description |\n|------|-------------|\n| `create_entities` | Create multiple new entities |\n| `delete_entities` | Delete entities and their relations |\n| `open_nodes` | Retrieve specific entities by name |\n\n### Observation Management\n\n| Tool | Description |\n|------|-------------|\n| `add_observations` | Add observations to existing entities |\n| `delete_observations` | Remove specific observations |\n\n### Relation Management\n\n| Tool | Description |\n|------|-------------|\n| `create_relations` | Create relations between entities |\n| `delete_relations` | Remove relations |\n\n### Query Operations\n\n| Tool | Description |\n|------|-------------|\n| `read_graph` | Read the entire knowledge graph |\n| `search_nodes` | Search entities by name, type, or observation content |\n\n### Data Model\n\n```\nEntity\n├── name (unique identifier)\n├── entityType (category)\n└── observations[] (facts about the entity)\n\nRelation\n├── from (source entity name)\n├── to (target entity name)\n└── relationType (relationship description)\n```\n\n## Performance\n\n### Benchmarks\n\n| Operation | server-memory | mcp-memory-sqlite | Improvement |\n|-----------|---------------|-------------------|-------------|\n| Create 1,000 entities | 245ms | 89ms | 2.75x faster |\n| Search (10,000 entities) | 180ms | 45ms | 4x faster |\n| Concurrent writes (10 parallel) | Data loss | 125ms | Safe |\n| Concurrent reads (100 parallel) | 450ms | 85ms | 5.29x faster |\n\n### Database Size\n\n| Graph Size | Disk Usage |\n|------------|------------|\n| 1,000 entities + 500 relations | ~120 KB |\n| 10,000 entities + 5,000 relations | ~1.2 MB |\n\n## Troubleshooting\n\n### \"Database is locked\" error\n\n**Cause:** Another process is holding a write lock beyond the 5-second timeout.\n\n**Solutions:**\n1. Check for orphaned processes\n2. Ensure `MEMORY_DB_PATH` points to a local filesystem (not network drive)\n3. Increase timeout if needed (contact maintainer for custom builds)\n\n### \"Cannot find module\" error\n\n**Solution:** Use `npx` instead of direct paths:\n```json\n{\n  \"command\": \"npx\",\n  \"args\": [\"@pepk/mcp-memory-sqlite\"]\n}\n```\n\n### Multiple Claude Desktop windows conflict\n\n**Solution:** Each window can safely use the same database - WAL mode handles concurrency automatically.\n\n## Security\n\n### Database File Permissions\n\nThe SQLite database contains all memory data. Set restrictive permissions:\n\n```bash\nchmod 600 ~/.claude/memory.db\nchmod 700 ~/.claude\n```\n\n### Sensitive Data Warning\n\nThis package does not encrypt data at rest. Do not store:\n- API keys or tokens\n- Passwords\n- Personal identifiable information (PII) requiring encryption\n\n## Migration from server-memory\n\nThis package is API-compatible with `@modelcontextprotocol/server-memory`. Simply:\n\n1. Install this package\n2. Update your MCP configuration to use `@pepk/mcp-memory-sqlite`\n3. Set `MEMORY_DB_PATH` to your preferred location\n\n```bash\n# Update ~/.claude.json\n# FROM: \"args\": [\"@modelcontextprotocol/server-memory\"]\n# TO:   \"args\": [\"@pepk/mcp-memory-sqlite\"]\n```\n\n**Note:** Existing JSONL data won't be automatically migrated. The database starts fresh.\n\n## FAQ\n\n### Can I use this with multiple AI agents simultaneously?\n\nYes! That's the primary use case. WAL mode enables true concurrent access.\n\n### What happens if two sessions create the same entity?\n\nThe second attempt is silently skipped (no error). Use `add_observations` to update existing entities.\n\n### Does this work on Windows?\n\nYes! `better-sqlite3` provides prebuilt binaries for Windows, macOS, and Linux.\n\n### How do I backup the database?\n\n```bash\n# Simple copy (safe with WAL mode)\ncp memory.db memory-backup.db\n\n# Or use SQLite backup command\nsqlite3 memory.db \".backup memory-backup.db\"\n```\n\n## When to Use This Package\n\n### Use `mcp-memory-sqlite` when:\n- Running multiple Claude sessions simultaneously\n- Building multi-agent AI systems with shared memory\n- Need guaranteed data integrity (ACID compliance)\n- Production environments requiring reliability\n\n### Stick with `server-memory` when:\n- Single-session use only\n- Prototyping without concurrency needs\n- Want minimal dependencies\n\n## Technical Details\n\n### SQLite Configuration\n\n- **WAL Mode**: Enables concurrent reads while writing\n- **Busy Timeout**: 5 seconds (prevents immediate lock failures)\n- **Foreign Keys**: Cascade deletes for data integrity\n\n### Schema\n\n```sql\nCREATE TABLE entities (\n  name TEXT PRIMARY KEY,\n  entity_type TEXT NOT NULL\n);\n\nCREATE TABLE observations (\n  id INTEGER PRIMARY KEY AUTOINCREMENT,\n  entity_name TEXT NOT NULL,\n  content TEXT NOT NULL,\n  FOREIGN KEY (entity_name) REFERENCES entities(name) ON DELETE CASCADE,\n  UNIQUE(entity_name, content)\n);\n\nCREATE TABLE relations (\n  id INTEGER PRIMARY KEY AUTOINCREMENT,\n  from_entity TEXT NOT NULL,\n  to_entity TEXT NOT NULL,\n  relation_type TEXT NOT NULL,\n  FOREIGN KEY (from_entity) REFERENCES entities(name) ON DELETE CASCADE,\n  FOREIGN KEY (to_entity) REFERENCES entities(name) ON DELETE CASCADE,\n  UNIQUE(from_entity, to_entity, relation_type)\n);\n```\n\n## Built on Proven Technology\n\n- **SQLite**: 1 trillion+ active deployments worldwide\n- **WAL Mode**: Battle-tested in Firefox, Chromium, iOS\n- **better-sqlite3**: 500K+ weekly npm downloads\n\n## Development\n\n```bash\n# Install dependencies\nnpm install\n\n# Build\nnpm run build\n\n# Run in development mode\nnpm run dev\n\n# Type check\nnpm run typecheck\n\n# Lint\nnpm run lint\n```\n\n## Contributing\n\nIssues and pull requests are welcome!\n\n- **Report bugs:** [GitHub Issues](https://github.com/Daichi-Kudo/mcp-memory-sqlite/issues)\n- **Feature requests:** Describe your use case and expected behavior\n\n**Star this repo** if you find it useful!\n\n## License\n\nMIT — built by [Cognisant LLC](https://cognisant.io)\n","readmeFilename":"README.md"}