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Second Brain Sync

by Rahil Pirani
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Description

This plugin has not been manually reviewed by Obsidian staff. Sync your Obsidian notes to your self-hosted Second Brain MCP server on Cloudflare Workers. Search your brain from inside Obsidian.

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Latest Version

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Changelog

See all version on GitHub

README file from

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Second Brain Sync — Obsidian Plugin

Sync your Obsidian notes to your self-hosted Second Brain MCP server on Cloudflare Workers. Search your brain from inside Obsidian.

Features

  • Sync the current note with one click or hotkey
  • Sync all notes tagged with your sync tag in bulk
  • Auto-sync tagged notes on save
  • Search your second brain from an Obsidian sidebar panel
  • Chunking for long notes — splits automatically so each part gets a clean embedding
  • Status bar showing last sync time
  • Test connection button to verify your setup

Prerequisites

You need a running Second Brain Worker. Deploy one at: → https://github.com/rahilp/second-brain-cloudflare

Installation

Manual (local development)

# 1. Clone into your vault's plugins folder
cd /path/to/your/vault/.obsidian/plugins
git clone https://github.com/rahilp/second-brain-obsidian second-brain-sync
cd second-brain-sync

# 2. Install dependencies and build
npm install
npm run build

# 3. Enable in Obsidian
# Settings → Community Plugins → toggle on "Second Brain Sync"

From Obsidian Community Plugins

Search for "Second Brain Sync" in Settings → Community Plugins → Browse.

Second Brain Sync in Obsidian Community

Setup

  1. Open Settings → Second Brain Sync
  2. Enter your Worker URL (e.g. https://second-brain.yourname.workers.dev)
  3. Enter your Auth token (the AUTH_TOKEN secret you set in Cloudflare)
  4. Click Test to verify the connection
  5. Set your Sync tag (default: brain)

Usage

Syncing notes

Tag any note for sync by adding to its frontmatter:

---
tags:
  - brain
---

Then either:

  • Click the brain icon in the ribbon to sync the current note
  • Use the command palette: "Sync current note to Second Brain"
  • Use the command palette: "Sync all tagged notes to Second Brain"
  • Enable auto-sync in settings to sync tagged notes on every save

Searching

Click the search icon in the ribbon or run "Open Second Brain search" from the command palette. A sidebar panel opens with a search box that queries your Worker's semantic search.

Settings reference

Setting Description Default
Worker URL Your Cloudflare Worker URL —
Auth token Your AUTH_TOKEN secret —
Sync tag Frontmatter tag that marks a note for sync brain
Auto-sync on save Sync tagged notes automatically on save Off
Chunk size Max characters per chunk (~400 tokens = 1600 chars) 1600
Chunk overlap Overlap between chunks to preserve context 200
Show sync status Show last sync time in status bar On

How chunking works

Long notes are split into overlapping segments before being sent to the Worker. Each segment gets its own embedding in Vectorize so long notes don't produce diluted search results.

Short notes (under the chunk size) are stored as a single entry — no change in behavior.

The overlap ensures that sentences at chunk boundaries don't lose context.

Development

npm run dev   # Watch mode — rebuilds on changes
npm run build # Production build

Copy main.js and manifest.json to your vault's plugin folder after building.

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