GitHub Copilot Proxy

Made by Ritesh Agarwal — ☕ Buy me a coffee

A VS Code extension that runs an embedded HTTP proxy on port 4242, intercepting all GitHub Copilot traffic through github.copilot.advanced.debug.overrideProxyUrl. No OAuth device flow — it reuses VS Code's built-in GitHub authentication session.

How to Use

Install and reload VS Code — the proxy starts automatically on port 4242
Open GitHub Copilot Chat (Ctrl+Alt+I / Cmd+Alt+I)
Click the model selector at the bottom of the chat input
Choose any model — Claude, GPT-4o, Gemini, etc.
All requests route through the proxy with full metrics tracking
Open the Dashboard (http://localhost:4242/dashboard) to see usage, quotas, and the Available Models table

Features

Transparent proxy — routes /v1/chat/completions, /v1/messages (Anthropic), /v1/embeddings, /v1/models
Anthropic ↔ OpenAI translation — automatically converts Claude-format requests to OpenAI format and back
Free Model Access — exposes 3 free Copilot models with no deduction from premium context quota
Usage dashboard — live metrics, quotas, model usage tabs, available models table with tier/filter
Message inspector — side-by-side input/output viewer for every request
Activity bar sidebar — Status and Metrics tree views with clickable links
Rate limiting — optional per-request delay, configurable in settings
Exchange storage — persists up to 200 exchanges to exchanges.jsonl across sessions
Multi-window support — second VS Code window attaches to the existing proxy silently
chatLanguageModels.json sync — registers a CopilotProxy entry at http://localhost:4242/v1

Requirements

VS Code 1.95+
GitHub Copilot subscription

Author

Ritesh Agarwal — ☕ Buy me a coffee

Quick Start

Install the .vsix or from the marketplace
Reload VS Code — the proxy starts automatically on port 4242
Open the Copilot Proxy sidebar in the activity bar
Click Open Dashboard to view metrics and available models

Endpoints

Method	Path	Description
`GET`	`/health`	Health check
`GET`	`/metrics`	Session metrics
`GET`	`/metrics/cumulative`	All-time metrics (persisted)
`GET`	`/dashboard`	Usage dashboard (HTML)
`GET`	`/compilation`	Message inspector (HTML)
`GET`	`/compilation/data`	Raw exchange list (JSON)
`GET`	`/usage`	GitHub Copilot quota data
`GET`	`/quota`	Parsed JWT claims
`GET`	`/v1/models`	Available models from Copilot API
`POST`	`/v1/chat/completions`	OpenAI-compatible chat (streaming + JSON)
`POST`	`/v1/messages`	Anthropic-compatible chat
`POST`	`/v1/embeddings`	Embeddings passthrough
`POST`	`/token/refresh`	Invalidate token cache

Configuration

Setting	Default	Description
`copilotProxy.enabled`	`true`	Enable/disable the proxy
`copilotProxy.proxyPort`	`4242`	Port to listen on
`copilotProxy.accountType`	`individual`	`individual`, `business`, or `enterprise`
`copilotProxy.rateLimitSeconds`	`0`	Minimum seconds between requests (0 = disabled)
`copilotProxy.rateLimitWait`	`false`	Wait instead of rejecting when rate limited
`copilotProxy.logRequests`	`false`	Log all requests to output channel
`copilotProxy.showToken`	`false`	Enable `/token` endpoint for JWT debug

Commands

Command	Description
`Copilot Proxy: Toggle`	Enable/disable the proxy
`Copilot Proxy: Show Status`	Show current proxy status
`Copilot Proxy: Open Dashboard`	Open usage dashboard in Simple Browser
`Copilot Proxy: Open Compilation Viewer`	Open message inspector in Simple Browser
`Copilot Proxy: Refresh Token`	Invalidate and re-fetch Copilot token
`Copilot Proxy: Change Port`	Change the proxy port
`Copilot Proxy: Change Account Type`	Switch between individual/business/enterprise
`Copilot Proxy: Reset Metrics`	Clear all session and cumulative metrics
`Copilot Proxy: Restart Proxy`	Restart the embedded server

Development

# Install dependencies
npm install

# Build
npm run compile

# Package
npx vsce package --no-git-tag-version --allow-missing-repository

# Install locally
code --install-extension vscode-copilot-proxy-0.1.0.vsix

Architecture

extension.ts          → activate/deactivate, command registration
proxy-server.ts       → embedded http.Server, all routes, metrics, HTML dashboards
copilot-auth.ts       → VS Code GitHub session → Copilot JWT (with caching)
translate.ts          → Anthropic ↔ OpenAI format translation
chat-language-models.ts → sync chatLanguageModels.json
sidebar.ts            → Activity bar Status + Metrics tree views
types.ts              → Shared TypeScript interfaces

Resources

MIT License