Second Brain Sync

Sync your Obsidian notes to your own AI memory. Search them back with semantic search — from inside Obsidian, or from any AI tool that supports MCP.

Built on Cloudflare Workers + Vectorize. Your data stays on your own infrastructure.

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What it does

• Sync any note to your Second Brain with one click or a hotkey
• Bulk sync all notes with a specific tag
• Auto-sync tagged notes every time you save
• Chunk long notes automatically so embeddings stay clean
• Status bar shows the last time you synced

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Getting started

You need a running Second Brain Worker before this plugin is useful. Deploy one for free at:

→ github.com/rahilp/second-brain-cloudflare

Once your Worker is running:

1. Open Settings → Second Brain Sync
2. Paste your Worker URL (e.g. https://second-brain.yourname.workers.dev)
3. Paste your Auth token (the AUTH_TOKEN secret you set in Cloudflare)
4. Hit Test to confirm the connection works
5. Set your Sync tag — any note with this tag in its frontmatter will sync (default: brain)

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Syncing notes

Tag a note for sync by adding the tag to its frontmatter:

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tags:
  - brain
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Then sync it:

• Click the brain icon in the ribbon to sync the current note
• Ctrl/Cmd + P → "Sync current note to Second Brain"
• Ctrl/Cmd + P → "Sync all tagged notes to Second Brain"
• Or turn on auto-sync in settings and forget about it

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Settings

Setting	Description	Default
Worker URL	Your Cloudflare Worker URL	—
Auth token	Your AUTH_TOKEN secret	—
Sync mode	Sync all notes, or only tagged ones	Tagged only
Sync tag	The frontmatter tag that marks a note for sync	brain
Auto-sync on save	Sync automatically when you save	Off
Auto-sync delay	How long to wait after you stop typing	5s
Chunk size	Max characters per chunk	1600
Chunk overlap	Overlap between chunks to preserve context	200
Show sync status	Show last sync time in the status bar	On

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How chunking works

Notes under the chunk size get stored as a single entry. Longer notes get split into overlapping segments — each one gets its own embedding in Vectorize, so long notes don't produce diluted search results. The overlap keeps sentences at chunk boundaries from losing context.

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Support

If this is useful to you, you can buy me a coffee:

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Development

npm run dev     # watch mode
npm run build   # production build

The plugin source is at github.com/rahilp/second-brain-obsidian-plugin.