ContextSync

Stop re-explaining your code to AI. Collaborative context sharing for VS Code teams.

ContextSync lets teams share AI conversation context automatically. Every chat is saved as a structured .md file, synced via OneDrive to your team's Obsidian vault, and injected as context into every team member's AI chats.

Works with GitHub Copilot, Claude (Anthropic API), ChatGPT (OpenAI API), and any VS Code language model provider.

Why?

1. Team Memory: Enables collaboration across dev teams
2. Zero Effort: Context is saved and shared automatically
3. Locally Controlled: Sync in real time and hide conversations with privacy mode
4. Direct Integration: Use @contextsync directly in Copilot chat

Install from the VS Code Marketplace

| Local Context Generation | Real-time Team Sync | | :---: | :---: | | | |

How It Works

You chat in VS Code
      ↓
ContextSync saves chat as .md (chat_zayaan_2025-01-15_001.md)
      ↓
OneDrive syncs .md to the team vault
      ↓
Bob opens VS Code → ContextSync loads Zayaan's .md
      ↓
Bob's AI chat has Zayaan's context automatically

Setup

1. Install dependencies

npm install
npm run compile

2. Configure settings (VS Code Settings → search "ContextSync")

3. Choose your AI provider

ContextSync talks to models three ways — use any or all:

API keys are stored in your OS keychain via VS Code SecretStorage — never in settings files. Run the same command and submit an empty input to clear a key. Edit contextSync.anthropicModels / contextSync.openaiModels to change which model IDs appear in the picker.

4. Open the chat

Run ContextSync: Open Chat from the command palette (Ctrl+Shift+P), or type @contextsync in GitHub Copilot chat (the @contextsync participant requires Copilot since it runs inside Copilot Chat).

File Format

Each chat session produces one .md file:

---
id: zayaan-01-15_1736934720000
author: zayaan
topic: "How should we structure the auth middleware"
tags: [auth, backend, typescript]
created: 2025-01-15T10:32:00Z
updated: 2025-01-15T10:45:00Z
---

## Summary
Decided to use JWT with 15-minute expiry and refresh token rotation...

## Key Decisions
- JWT with 15min expiry + refresh token rotation
- Auth middleware lives in /packages/auth

## Context Links
- [[chat_bob_2025-01-14_003]]

Project Structure

src/
├── extension.ts          # Entry point, registers commands
├── types.ts              # Shared TypeScript types
├── chat/
│   ├── ChatPanel.ts      # WebviewPanel lifecycle
│   └── ChatHandler.ts    # Prompt assembly + context injection
├── context/
│   ├── ContextManager.ts # Loads .md files, builds context blocks
│   ├── markdownParsing.ts# Pure parsing helpers (unit tested)
│   └── FileWatcher.ts    # Watches sync folder for changes
├── llm/
│   ├── ModelRouter.ts    # Routes to Copilot / Anthropic / OpenAI
│   └── directClients.ts  # Direct Anthropic + OpenAI API clients
├── markdown/
│   └── MarkdownExporter.ts  # Exports sessions to structured .md
├── test/
│   └── markdownParsing.test.ts  # Unit tests (npm test)
└── webview/
    └── chat.html         # Chat UI (vanilla JS)

Contributing

Find the project at https://github.com/ZayaanB/Context-Sync

Note: Updating the GitHub repository does not automatically update the extension for users. To release, bump the version in package.json and run vsce publish (requires a VS Code publisher account).