Second Brain — MCP Server on Cloudflare Workers

A personal memory layer that works across every AI tool you use.
Self-hosted on Cloudflare's free tier. Truly one-click deploy — no manual setup required.

🔑 Before you deploy: You'll be asked to set an AUTH_TOKEN during deployment.
Quick option: Use a memorable phrase like coffee-lover-2026
Secure option: Run openssl rand -base64 32 in your terminal and paste the result
Save it! You'll need this token to connect AI clients.

---

Every AI conversation starts from zero. Second Brain fixes that — give Claude, ChatGPT, Cursor, and any MCP-compatible client a shared memory layer that actually remembers what you tell it.

Five tools. One brain. Every AI client.

Tool	Description
remember	Store anything — ideas, decisions, project context
append	Add updates to existing entries without creating duplicates
recall	Semantic search with recency bias — finds things by meaning, prioritizes fresh info
list_recent	Browse recent memories chronologically
forget	Delete an entry and all its chunks

---

Quickstart

1. Click Deploy — Cloudflare provisions D1, Vectorize, and the Worker automatically
2. Choose your token — During deploy, enter a memorable token (like coffee-lover-2026) or generate a secure one with openssl rand -base64 32. Save it!
3. That's it! — Schema auto-creates on first request. Your Worker is ready at https://<your-worker-url>/
4. Connect to Claude — instructions →

# Test it's working (use your token from step 2)
curl -X POST https://<your-worker-url>/capture \
  -H "Authorization: Bearer coffee-lover-2026" \
  -H "Content-Type: application/json" \
  -d '{"content": "second brain is working", "source": "test"}'
# → {"ok":true,"id":"..."}

---

Documentation

• Setup Guide — one-click deploy, token setup, connecting AI clients
• How It Works — semantic search, chunking, duplicate detection
• Connect to AI Clients — Claude Desktop, Claude Code, claude.ai, iOS, Claude instructions
• Capture from Anywhere — browser bookmarklet, iOS Shortcuts, share sheet
• Web UI — Dashboard UI and mobile interface
• Obsidian Plugin — install, configure, sync modes
• API Reference — /capture, /list, /mcp endpoints

---

Stack

Cloudflare Workers · D1 SQLite · Vectorize · Workers AI · MCP TypeScript SDK · MIT License

All free tier at personal scale.

---

Integrations

• Obsidian — second-brain-obsidian-plugin · available in Obsidian Community Plugins
• iOS — Brain Dump, Text Brain Dump, and Save to Brain shortcuts in ios Shortcuts/
• Browser — bookmarklet in bookmarklet.js

---

MIT License · Discussions