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

npm install

2. Create D1 Database

# Create the database
wrangler d1 create memory-graph

# Copy the database_id from output to wrangler.toml

3. Run Migrations

# Local development
npm run db:migrate:local

# Production
npm run db:migrate

4. Deploy

npm run deploy

5. Set API Key Secret

# 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:

{
  "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:

   claude -p "Use mcp__memory__read_graph and output the raw JSON result" > scripts/local-memory.json
   

2. Run migration:

   npx ts-node scripts/migrate-local-memory.ts
   

API Endpoints

REST API (for apps)

MCP Protocol

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:

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:

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:

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:

curl -X POST https://your-n8n-instance/webhook/memory-graph \
  -H "Content-Type: application/json" \
  -d '{}'

Create Entity - POST to /webhook/memory-create:

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:

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:

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:

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:

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

# 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)       │
└─────────────────────────────────────────┘