tDear Codeforces Community,↵
↵
As we bid farewell to an amazing 2025 and welcome the exciting possibilities of 2026, I'm thrilled to announce a significant update to **cf-tool** that brings a powerful new way to interact with Codeforces from your command line!↵
↵
## What's New?↵
↵
**cf-tool now supports Browser Mode!** ↵
↵
After Cloudflare tightened its protection, traditional command-line tools faced challenges accessing Codeforces. Today, we're proud to introduce a solution that leverages your browser's authenticated session through the power of browser automation.↵
↵
### Key Achievement: Parse & Submit POC Complete↵
↵
The core functionality is now **fully working**:↵
↵
- **`cf parse`** — Fetch problem test cases with ease↵
- Supports both old (`<br>`) and new (`<div>`) HTML formats↵
- Automatically handles multi-line inputs correctly↵
- Clean, formatted test case files↵
↵
- **`cf submit`** — Submit your code directly from CLI↵
- Automatic problem selection (with case-insensitive support)↵
- Language selection↵
- Real-time submission monitoring↵
- All powered by your browser's authenticated session↵
↵
## How It Works↵
↵
We've integrated with **[mcp-chrome](https://github.com/hangwin/mcp-chrome/)**, an innovative Chrome extension that exposes the Chrome DevTools Protocol through MCP (Model Context Protocol). This means cf-tool can now:↵
- Bypass Cloudflare protections↵
- Use your existing login session↵
- Perform actions just like you would in a browser↵
- All from the comfort of your terminal!↵
↵
## Quick Start↵
↵
1. Install the browserDownload mcp-chrome extension:↵
↵
```bash↵
# - Download from GitHub releases: https://github.com/hangwin/mcp-chrome/releases↵
- Extract the downloaded file to a folder↵
↵
2. Install mcp-chrome-bridge↵
↵
Using npm:↵
npm install -g @hangwin/mcp-chrome-bridge↵
↵
# Start the bridge↵
mcp-chrome-bridge↵
```↵
↵
2Or using pnpm:↵
pnpm add -g @hangwin/mcp-chrome-bridge↵
↵
3. Load Chrome Extension↵
- Open Chrome and go to chrome://extensions/↵
- Enable "Developer mode"↵
- Click "Load unpacked" and select your downloaded extension folder↵
- Click the extension icon to open the plugin, then click connect to see the MCP configuration↵
↵
4. Start mcp-chrome-bridge↵
↵
Run this command:↵
mcp-chrome-bridge↵
↵
By default, it runs on http://127.0.0.1:12306/mcp↵
↵
5. Verify installation:↵
↵
```bash↵
↵
cf mcp-ping#// Should return: MCP Chrome Server is running↵
cf mocka#// Should open Chrome and navigate to Codeforces↵
```↵
↵
36. Start coding:↵
↵
```bash↵
↵
cf parse 2122d#// Fetch test cases↵
cf submit#// Submit your solution↵
```↵
↵
## Demo↵
↵
Here's a quick example of the new parse and submit workflow:↵
↵
```bash↵
$ cf parse 2122d↵
[INFO ] ✓ Browser mode enabled↵
[INFO ] Extracted 1 sample(s)↵
Parsed d with 1 samples.↵
↵
$ cd cf/contest/2122/d↵
$ cf gen # Generate code from template↵
$ vim d.cpp # Write your solution↵
$ cf test # Test locally↵
[INFO ] All test cases passed! ↵
↵
$ cf submit↵
[INFO ] Selecting problem: d (converted to: D)↵
[INFO ] Code submitted successfully via browser↵
Submitted↵
```↵
↵
## Acknowledgments↵
↵
This update wouldn't be possible without:↵
↵
- The **[mcp-chrome](https://github.com/hangwin/mcp-chrome/)** project for providing the browser automation bridge↵
↵
- The **[cf-tool](https://github.com/xalanq/cf-tool)** original author (@xalanq) for creating this amazing tool↵
↵
- The **Codeforces community** for your continued support and feedback↵
↵
- Everyone who contributed, tested, and provided feedback during development↵
↵
## What's Next?↵
↵
This is a POC (Proof of Concept) release. We've successfully demonstrated that parse and submit work flawlessly. Looking ahead, we're planning:↵
↵
- Fully function support↵
↵
- Automated installation scripts↵
↵
- More comprehensive testing↵
↵
- Additional features based on community feedback↵
↵
## Try It Now!↵
↵
**GitHub Repository**: [https://github.com/NetWilliam/cf-tool](https://github.com/NetWilliam/cf-tool)↵
↵
We invite you to try it out and share your feedback! Whether you're a seasoned cf-tool user or new to command-line competitive programming tools, we'd love to hear from you.↵
↵
**Installation**: Check the README for detailed setup instructions↵
↵
---↵
↵
## Closing Thoughts↵
↵
As we step into 2026, let's carry forward the spirit of learning, growing, and building together. Thank you for being part of this wonderful community. Here's to another year of solving problems, writing elegant code, and pushing the boundaries of what's possible!↵
↵
**Happy New Year!** ↵
↵
May your code compile on the first try, your solutions pass all test cases, and your ratings reach new heights in 2026! ↵
↵
---↵
↵
**Best regards**,↵
The cf-tool Browser Mode Team↵
*2025-12-31*↵
↵
---↵
↵
P.S. Star the repo if you find it useful! Every bit of support helps us keep improving.↵
↵
P.P.S. Found a bug? Have a suggestion? Please open an issue or submit a PR! We're always looking to improve.↵
↵
P.P.P.S. Vibe coding is so cool, even this post is vibed~~~hahahahaha,2025-12-31
↵
As we bid farewell to an amazing 2025 and welcome the exciting possibilities of 2026, I'm thrilled to announce a significant update to **cf-tool** that brings a powerful new way to interact with Codeforces from your command line!↵
↵
## What's New?↵
↵
**cf-tool now supports Browser Mode!** ↵
↵
After Cloudflare tightened its protection, traditional command-line tools faced challenges accessing Codeforces. Today, we're proud to introduce a solution that leverages your browser's authenticated session through the power of browser automation.↵
↵
### Key Achievement: Parse & Submit POC Complete↵
↵
The core functionality is now **fully working**:↵
↵
- **`cf parse`** — Fetch problem test cases with ease↵
- Supports both old (`<br>`) and new (`<div>`) HTML formats↵
- Automatically handles multi-line inputs correctly↵
- Clean, formatted test case files↵
↵
- **`cf submit`** — Submit your code directly from CLI↵
- Automatic problem selection (with case-insensitive support)↵
- Language selection↵
- Real-time submission monitoring↵
- All powered by your browser's authenticated session↵
↵
## How It Works↵
↵
We've integrated with **[mcp-chrome](https://github.com/hangwin/mcp-chrome/)**, an innovative Chrome extension that exposes the Chrome DevTools Protocol through MCP (Model Context Protocol). This means cf-tool can now:↵
- Bypass Cloudflare protections↵
- Use your existing login session↵
- Perform actions just like you would in a browser↵
- All from the comfort of your terminal!↵
↵
## Quick Start↵
```bash↵
#
- Extract the downloaded file to a folder↵
↵
2. Install mcp-chrome-bridge↵
↵
Using npm:↵
npm install -g @hangwin/mcp-chrome-bridge↵
↵
mcp-chrome-bridge↵
```↵
↵
2
pnpm add -g @hangwin/mcp-chrome-bridge↵
↵
3. Load Chrome Extension↵
- Open Chrome and go to chrome://extensions/↵
- Enable "Developer mode"↵
- Click "Load unpacked" and select your downloaded extension folder↵
- Click the extension icon to open the plugin, then click connect to see the MCP configuration↵
↵
4. Start mcp-chrome-bridge↵
↵
Run this command:↵
mcp-chrome-bridge↵
↵
By default, it runs on http://127.0.0.1:12306/mcp↵
↵
5. Verify installation
↵
```bash
↵
cf mcp-ping
cf mocka
↵
```bash
↵
cf parse 2122d
cf submit
## Demo↵
↵
Here's a quick example of the new parse and submit workflow:↵
↵
```bash↵
$ cf parse 2122d↵
[INFO ] ✓ Browser mode enabled↵
[INFO ] Extracted 1 sample(s)↵
Parsed d with 1 samples.↵
↵
$ cd cf/contest/2122/d↵
$ cf gen # Generate code from template↵
$ vim d.cpp # Write your solution↵
$ cf test # Test locally↵
[INFO ] All test cases passed! ↵
↵
$ cf submit↵
[INFO ] Selecting problem: d (converted to: D)↵
[INFO ] Code submitted successfully via browser↵
Submitted↵
```↵
↵
## Acknowledgments↵
↵
This update wouldn't be possible without:↵
↵
- The **[mcp-chrome](https://github.com/hangwin/mcp-chrome/)** project for providing the browser automation bridge↵
↵
- The **[cf-tool](https://github.com/xalanq/cf-tool)** original author (@xalanq) for creating this amazing tool↵
↵
- The **Codeforces community** for your continued support and feedback↵
↵
- Everyone who contributed, tested, and provided feedback during development↵
↵
## What's Next?↵
↵
This is a POC (Proof of Concept) release. We've successfully demonstrated that parse and submit work flawlessly. Looking ahead, we're planning:↵
↵
- Fully function support↵
↵
- Automated installation scripts↵
↵
- More comprehensive testing↵
↵
- Additional features based on community feedback↵
↵
## Try It Now!↵
↵
**GitHub Repository**: [https://github.com/NetWilliam/cf-tool](https://github.com/NetWilliam/cf-tool)↵
↵
We invite you to try it out and share your feedback! Whether you're a seasoned cf-tool user or new to command-line competitive programming tools, we'd love to hear from you.↵
↵
**Installation**: Check the README for detailed setup instructions↵
↵
---↵
↵
## Closing Thoughts↵
↵
As we step into 2026, let's carry forward the spirit of learning, growing, and building together. Thank you for being part of this wonderful community. Here's to another year of solving problems, writing elegant code, and pushing the boundaries of what's possible!↵
↵
**Happy New Year!** ↵
↵
May your code compile on the first try, your solutions pass all test cases, and your ratings reach new heights in 2026! ↵
↵
---↵
↵
**Best regards**,↵
The cf-tool Browser Mode Team↵
*2025-12-31*↵
↵
---↵
↵
P.S. Star the repo if you find it useful! Every bit of support helps us keep improving.↵
↵
P.P.S. Found a bug? Have a suggestion? Please open an issue or submit a PR! We're always looking to improve.↵
↵
P.P.P.S. Vibe coding is so cool, even this post is vibed~~~hahahahaha,2025-12-31
