# Memory MCP Worker
Cloudflare Worker implementing MCP protocol for cross-device memory/knowledge graph access.
## Features
- **MCP Protocol Support**: Works with Claude Code via HTTP transport
- **REST API**: Access from mobile apps, desktop apps, n8n workflows
- **D1 Database**: SQLite-based persistent storage
- **Full-text Search**: Search across all observations
## Quick Start
### 1. Install Dependencies
```bash
npm install
```
### 2. Create D1 Database
```bash
# Create the database
wrangler d1 create memory-graph
# Copy the database_id from output to wrangler.toml
```
### 3. Run Migrations
```bash
# Local development
npm run db:migrate:local
# Production
npm run db:migrate
```
### 4. Deploy
```bash
npm run deploy
```
### 5. Set API Key Secret
```bash
# Generate an API key
openssl rand -base64 32 | tr -d '/+=' | head -c 32
# Add as secret
echo "YOUR_API_KEY" | npx wrangler secret put API_KEY
```
### 6. Configure Claude Code
Add to your `~/.claude/settings.json` or `.mcp.json`:
```json
{
"mcpServers": {
"memory-remote": {
"type": "http",
"url": "https://memory-mcp.45black-limited.workers.dev/mcp",
"headers": {
"X-API-Key": "YOUR_API_KEY"
}
}
}
}
```
## Migrating from Local Memory
1. Export your local memory:
```bash
claude -p "Use mcp__memory__read_graph and output the raw JSON result" > scripts/local-memory.json
```
2. Run migration:
```bash
npx ts-node scripts/migrate-local-memory.ts
```
## API Endpoints
### REST API (for apps)
| Endpoint | Method | Description |
|----------|--------|-------------|
| `/api/entities` | GET | List all entities |
| `/api/entities/:name` | GET | Get entity with observations |
| `/api/entities` | POST | Create entity |
| `/api/entities/:name/observations` | POST | Add observations |
| `/api/relations` | GET | List all relations |
| `/api/relations` | POST | Create relation |
| `/api/search?q=` | GET | Search entities and observations |
| `/api/graph` | GET | Get full graph |
| `/api/import` | POST | Bulk import |
### MCP Protocol
| Endpoint | Method | Description |
|----------|--------|-------------|
| `/mcp` | POST | MCP JSON-RPC requests |
| `/mcp/sse` | GET | SSE connection for MCP |
## MCP Tools Available
- `create_entities` - Create new entities
- `create_relations` - Create relations between entities
- `add_observations` - Add observations to entities
- `read_graph` - Read entire knowledge graph
- `search_nodes` - Search by query
- `open_nodes` - Get specific nodes by name
- `delete_entities` - Delete entities
- `delete_relations` - Delete relations
## Authentication
All `/api/*` and `/mcp/*` endpoints require authentication via API key.
**Headers supported:**
- `X-API-Key: YOUR_API_KEY`
- `Authorization: Bearer YOUR_API_KEY`
The health check endpoint (`/`) is public.
## Mobile App Integration
Example fetch from a mobile app:
```typescript
const API_KEY = 'YOUR_API_KEY';
const BASE_URL = 'https://memory-mcp.45black-limited.workers.dev';
const headers = {
'Content-Type': 'application/json',
'X-API-Key': API_KEY,
};
// Search for a project
const response = await fetch(`${BASE_URL}/api/search?q=Household%20Planner`, { headers });
const data = await response.json();
// Add an observation
await fetch(`${BASE_URL}/api/entities/Household%20Planner/observations`, {
method: 'POST',
headers,
body: JSON.stringify({
contents: ['Added new budget category feature']
})
});
```
## n8n Integration
An n8n workflow is included for querying the Memory API via webhooks.
### Setup
1. Import `n8n-workflow-memory-api.json` into n8n
2. Create a "Header Auth" credential:
- Name: `Memory MCP API Key`
- Header Name: `X-API-Key`
- Header Value: `YOUR_API_KEY`
3. Assign the credential to all three HTTP Request nodes
4. Activate the workflow
### Endpoints
**Search** - POST to `/webhook/memory-search`:
```bash
curl -X POST https://your-n8n-instance/webhook/memory-search \
-H "Content-Type: application/json" \
-d '{"query": "Household Planner"}'
```
**Get Entity** - POST to `/webhook/memory-entity`:
```bash
curl -X POST https://your-n8n-instance/webhook/memory-entity \
-H "Content-Type: application/json" \
-d '{"name": "Household Planner"}'
```
**Get Full Graph** - POST to `/webhook/memory-graph`:
```bash
curl -X POST https://your-n8n-instance/webhook/memory-graph \
-H "Content-Type: application/json" \
-d '{}'
```
**Create Entity** - POST to `/webhook/memory-create`:
```bash
curl -X POST https://your-n8n-instance/webhook/memory-create \
-H "Content-Type: application/json" \
-d '{"name": "My Project", "entityType": "Project", "observations": ["First observation"]}'
```
**Add Observations** - POST to `/webhook/memory-observations`:
```bash
curl -X POST https://your-n8n-instance/webhook/memory-observations \
-H "Content-Type: application/json" \
-d '{"name": "My Project", "contents": ["New observation 1", "New observation 2"]}'
```
**Create Relation** - POST to `/webhook/memory-relations`:
```bash
curl -X POST https://your-n8n-instance/webhook/memory-relations \
-H "Content-Type: application/json" \
-d '{"from": "Project A", "to": "Project B", "relationType": "depends_on"}'
```
**Delete Entity** - POST to `/webhook/memory-delete`:
```bash
curl -X POST https://your-n8n-instance/webhook/memory-delete \
-H "Content-Type: application/json" \
-d '{"name": "Entity Name"}'
```
**Delete Relation** - POST to `/webhook/memory-delete-relation`:
```bash
curl -X POST https://your-n8n-instance/webhook/memory-delete-relation \
-H "Content-Type: application/json" \
-d '{"from": "Entity A", "to": "Entity B", "relationType": "relation_type"}'
```
## Development
```bash
# Start local dev server
npm run dev
# Typecheck
npm run typecheck
```
## Architecture
```
┌─────────────────────────────────────────┐
│ Cloudflare Worker │
│ memory-mcp.45black.workers.dev │
├─────────────────────────────────────────┤
│ Hono Framework │
│ ├── /api/* → REST API │
│ └── /mcp → MCP Protocol │
├─────────────────────────────────────────┤
│ Cloudflare D1 (SQLite) │
│ ├── entities │
│ ├── observations │
│ ├── relations │
│ └── observations_fts (full-text) │
└─────────────────────────────────────────┘
```
