Coding Agents (Claude Code, Cursor, Copilot…) (AI Tools & LLM Clients): open-source projects that exist because someone reverse engineered a closed product, sorted by GitHub stars.
Clean-room Rust/Python rewrite of the Claude Code agent harness after the source leak
Wraps Codex, Claude Code, Antigravity, Grok and Gemini CLI OAuth backends as OpenAI/Claude-compatible APIs
Relay that exposes Claude, OpenAI, Gemini and Grok subscriptions as unified APIs
Proxy that routes Claude Code's Anthropic API traffic to other model providers
Antigravity account manager with local OpenAI/Anthropic/Gemini proxy
Reverse-engineered rebuild of the Anthropic Claude Code CLI as an open terminal coding assistant
OpenCode plugin authenticating against Antigravity to use its Gemini/Claude quota
Claude Code 2.1.88 TypeScript source restored from sourcesContent in the leaked cli.js.map
Multi-protocol proxy for Antigravity, Codex, Grok, Kiro and Claude client backends
Converts Gemini CLI and Antigravity credentials into OpenAI, Gemini and Claude APIs
DLL-injection proxy forcer for Google Antigravity IDE without TUN mode
Reverse-engineered GitHub Copilot API exposed as OpenAI- and Anthropic-compatible proxy (works with Claude Code)
Anthropic-compatible proxy for Claude/Gemini models through Antigravity's Cloud Code
Unofficial Linux build of OpenAI's Codex/ChatGPT desktop app from the macOS bundle
Deep dive into Claude Code internals: agent loop, context engineering, tools
Run Claude Code on OpenAI models by translating its API traffic
macOS menu bar proxy reusing Claude Code and ChatGPT subscription OAuth for other AI tools
Intercepts and inspects API traffic of Claude Code, Codex CLI, Gemini CLI, Cursor CLI and other agents
Reverse-engineered Windsurf/Devin Desktop model access exposed as OpenAI/Anthropic/Gemini-compatible API
Architecture, patterns and internals of Claude Code reverse engineered from source maps
Claude Code to OpenAI API translation proxy
Patches Claude Code's minified cli.js to customize system prompts, toolsets, themes and UI
Uses LLMs to analyze minified Claude Code and visualize its LLM interactions and prompts
Electron app managing accounts and processes for Google Antigravity
Claude Code source restored from the sourcesContent of the leaked 2.1.88 source map
Unofficial GitHub Copilot plugin for Emacs
Proxy gateway for Kiro IDE & CLI (Amazon Q Developer) exposing OpenAI/Anthropic-compatible APIs
Go Codex reverse proxy with admin dashboard
OpenCode plugin using ChatGPT Plus/Pro OAuth via Codex backend
Reverse engineering analysis of GitHub Copilot's prompt and completion logic
Local API bridge that lets Pi, OpenCode and other clients use Claude and Antigravity subscriptions
Rust service translating the Kiro backend API to Anthropic format with token refresh
Proxy converting Cursor's web docs API into OpenAI/Anthropic-compatible format
OpenAI-compatible API served from a ChatGPT subscription via Codex auth
Resets Cursor's device identification to work around trial restrictions
Local proxy that reuses Codex CLI ChatGPT OAuth tokens as an OpenAI-compatible API
Converts Kiro accounts into OpenAI/Anthropic APIs with pooling and streaming
Claude.ai's generative UI widgets reverse engineered and rebuilt for the pi agent
GitHub Copilot and Codex gateway exposing OpenAI/Anthropic-compatible APIs
Go proxy that converts Cursor's internal chat API into an OpenAI-compatible endpoint
Cleanroom deobfuscation of the Claude Code npm package cli.js into readable source
Cloudflare Worker exposing Gemini CLI endpoints as an OpenAI API
Node.js proxy translating Google Antigravity's API into OpenAI format
Claude Code v2.1.88 TypeScript source recovered from the leaked npm source map
Reverse-engineering documentation of the full logic of the Claude Code CLI Node.js version
Middleware to remotely access and operate Codex/ChatGPT Desktop from other devices
Reverse engineers the Copilot VS Code extension JS bundle: module graph, prompt building, inline completion
Patched Claude Desktop builds for Arch/Fedora/NixOS/AppImage with Computer Use and extras
Reverse-engineered Cursor API turned into an OpenAI-compatible service
Unofficial Rust reimplementation of the Claude Code terminal UI
Proxy disguising requests as Antigravity traffic for OpenAI/Anthropic/Gemini APIs
HTTP/2 proxy that lets Cursor Composer talk to DeepSeek and other OpenAI-style backends
Go gateway converting Kiro (CodeWhisperer) auth into Anthropic/OpenAI APIs
FastAPI proxy turning Gemini CLI OAuth into OpenAI and Gemini API endpoints
Nightly Claude Code CLI decompile, reverse engineered and rebuilt as an open clean-room implementation
Turns Antigravity, Codex and Copilot into Anthropic/OpenAI-compatible servers
Proxy that makes third-party requests look like Claude Code to use subscription billing
Proxy that captures and visualizes in-flight Claude Code requests
Local proxy bridge for the Antigravity IDE language server
Runs Claude Desktop's Cowork mode natively on Linux
OpenAI and Anthropic compatible Kiro IDE API proxy gateway
Converts Claude Code's Anthropic requests to OpenAI format for OpenRouter
Qoder gateway reimplementing COSY request signing and device fingerprint
Compatibility and routing layer exposing Kiro IDE models as standard APIs
Kiro token manager and proxy that lets Claude Code use the Kiro backend
Semantic code search MCP tool powered by Windsurf's reverse-engineered SWE-grep protocol
Intercepting proxy to hook and rewrite Claude Code requests and responses
OpenAI-compatible API proxy for Cursor's Composer model
Buildable research fork of leaked Claude Code source with a reverse-engineered Bun build system
Reverse-engineered GitHub Copilot API client and server
Reverse engineering research on Claude Code internals
Adapter that lets Cursor Pro use third-party relay APIs by rewriting its requests
Source analysis report of Claude Code from its bundled CLI
Kiro reverse proxy for Claude Code and Codex with SSE streaming
OpenAI-style API proxy that drives Cursor's `agent` CLI
MCP server that exposes Claude Code agent-team orchestration to other harnesses
OpenAI-compatible API from Qoder CLI and WorkBuddy logins
Local reverse proxy reusing Claude Code and Codex subscriptions as APIs
Cloudflare Worker proxy translating Claude Code's Anthropic requests to other providers
Reverse-engineered Cursor API converted to an OpenAI-compatible service
Reverse engineered Cursor Tab completion API brought to Neovim
Local API proxy that routes AI coding tools through existing subscriptions, with CLI control
Reverse-engineered OpenAI Codex background computer-use feature
Converts a GitHub Copilot subscription into a ChatGPT-style API
Usage tracker for AI coding tools, with a probe that reverse engineers Cursor IDE data sources
Local OpenAI-compatible proxy for Qoder CN CLI
Use Claude and ChatGPT subscriptions inside Cursor instead of paid API tokens
Module-by-module analysis of the leaked Claude Code TypeScript source
Proxies Antigravity into Claude and Gemini APIs with thought-signature handling
Claude Code 2.1.88 source recovered from sourcemaps and build-fixed as a research reference
Use a Claude Max/Pro subscription inside the Pi coding agent
Middle layer that exposes Augment Code's API as OpenAI-compatible
Reverse engineering analysis of Claude Code's internal architecture
Independent research on Claude Code and Claude Agent SDK internals
Reverse-engineered Cursor's AI tab completion to use in other editors
Orchestrator built by reverse engineering Claude Code internals
Exposes Trae IDE's builtin models through an OpenAI-compatible API
Reverse-engineering notes on Claude Code's 512K lines of TypeScript: architecture and design decisions
Linux daemon reimplementing Claude Desktop Cowork's reverse-engineered vsock RPC protocol
Turns Alibaba Qoder accounts into one OpenAI-compatible API
OpenAI-compatible proxy using a Microsoft 365 Copilot licence as a model backend
Wraps Gemini CLI as an OpenAI-compatible API to use its free Gemini Pro quota
Desktop app exposing Kiro's models through local OpenAI/Anthropic-compatible API
Analysis of the GitHub Copilot extension internals
Converts Cursor's web chat into an OpenAI-compatible API
Turns GitHub Copilot into OpenAI/Anthropic-compatible server for Claude Code, Codex, OpenCode
OpenCode plugin reading Antigravity/Gemini CLI quota endpoints across accounts
Reverse-engineered Codex's web search to use with Claude and local models
Unofficial Rust client and proxy for the Ampcode (ampcode.com) coding agent API
Claude Code v2.1.88 source analysis: system prompts, hidden feature flags and architecture
Exposes GitHub Copilot as a local OpenAI-compatible API gateway from VS Code
Working Claude Code CLI rebuilt from reverse-engineered source analysis
Routes Codex/Claude Code traffic across multiple ChatGPT Pro and Claude Max subscriptions
Relay that converts Cursor's chat API into OpenAI format
Node.js Kiro-to-API proxy
Unofficial terminal client for the agent runtime shipped with ZCode Desktop
Reverse-engineered Claude Code to build single-file SDK CLIs in Node, Python, Go, Rust
CLIProxyAPI OAuth provider plugins for CodeBuddy, Trae and Qoder
Open source GitHub Copilot integration for Eclipse
Reverse-engineered Codex CLI auth to call OpenAI models via a Codex subscription
Patch for Google Antigravity that intercepts its internal Cloud Code API to add other LLM providers
DYLD-injection transparent proxy for Antigravity/Gemini with MITM of AI traffic
Bridges Claude Code to OpenAI models via API key or ChatGPT/Codex-plan OAuth
Converts Qoder AI service to OpenAI/Claude/Codex-format API
GitHub Copilot proxy for Xcode with Claude Agent and Codex Agent support
Adapter letting the Codex desktop app drive Claude Code via the Codex app-server protocol
Remote control client for ZCode Desktop on phones and tablets, built by replicating its protocol
Reverse proxy turning local Trae, WorkBuddy and Zcode into OpenAI API
Architecture breakdown of 23 Claude Code subsystems from source study
Tutorial on reverse engineering the Cursor IDE API
Qoder reverse engineering and Qoder-to-API demo
OpenAI- and Anthropic-compatible HTTP API in front of the Cursor Agent CLI
Reverse engineering Claude Code usage limits to track remaining quota
Kiro to Anthropic/OpenAI API proxy
Gateway exposing Google Antigravity's internal Gemini and Claude APIs
Reverse engineered Cursor IDE gRPC / protobuf definitions
Database manager and recovery tool for the Google Antigravity IDE conversation store
Lightweight gateway exposing Cursor's tools/models as an API
Go OpenAI-compatible API for Qoder
Protocol Buffers definitions for Cursor Tab
Stands in for the Claude in Chrome extension in Claude Code's local browser bridge, on Browserbase
Local proxy forwarding Anthropic Messages API calls to Kiro's backend using Kiro CLI credentials
Cursor IDE backend endpoint API reverse engineered (v2.6.22)
Reverse-engineered Kiro API with a provider management console
GitHub Copilot to OpenAI/Responses/Anthropic API server
API for obtaining free Cursor trial accounts
Unofficial Codex App for Linux with npm, AUR and Nix packaging
Wraps Cursor CLI as an OpenAI-compatible API for any client
Use a Cursor account inside the OpenCode TUI
Exposes GitHub Copilot as OpenAI/Anthropic-compatible API for Claude Code
OpenAI/Anthropic/Gemini-compatible Antigravity reverse gateway
Route Claude Code CLI through a Copilot subscription, Ollama or Anthropic
Reverse engineered RPC client for Cursor.sh cloud services
FastAPI proxy turning GitHub Copilot chat completions/embeddings into an OpenAI-compatible service
GitHub Copilot exposed as OpenAI-compatible APIs
Make the GitHub Copilot extension work with any LLM by proxying its traffic
Reverse analysis of Claude Code
Unofficial CLI and Whisper-compatible shim for Codex Desktop speech recognition
OpenAI API wrapper around the Qoder CLI
Codex App (macOS) ported to Linux
Proxy converting Cursor's docs chat endpoint to an OpenAI-compatible API
Intercepts Google Antigravity IDE API calls to use your own Gemini key
Decodes leaked Claude Code source: hidden features, 43 tool definitions, system prompts
HTTP proxy exposing GitHub Copilot free quota as an OpenAI-compatible API
Converts Cursor chat into an OpenAI-compatible API
Self-hosted GitHub Copilot bridge for Claude Code and Codex CLI
GitHub Copilot proxy with OpenAI Responses and Anthropic Messages APIs
OpenAI/Anthropic-compatible proxy for Alibaba Lingma and QoderCN
Exposes a Claude Max subscription as an OpenAI-compatible API
Rust port of CLIProxyAPI, the LLM-subscription-to-API proxy
Turns GitHub Copilot into an OpenAI/Anthropic-compatible server
Deno Kiro-to-API proxy
Claude Code reverse engineering notes on prompts, tool design and flow
Proxy intercepting Antigravity's Gemini API and rerouting to other providers
Routes AmpCode requests through local Claude Code, Codex CLI and Gemini OAuth credentials
Exposes VS Code's GitHub Copilot as an HTTP API
Kiro to API proxy
Local proxy translating Claude Code's Anthropic API to GitHub Copilot
Go proxy exposing GitHub Copilot as OpenAI and Anthropic endpoints
Reverse-engineered coding agents' session formats to resume sessions across agents
Uses Gemini CodeAssist (Gemini CLI) through OpenAI/Anthropic API interfaces
Rust Kiro-to-Anthropic API proxy with account pool
Reverse-engineered design documents and specs of the Claude Code CLI
Go/Gin Kiro API proxy with OpenAI and Anthropic compatibility
Proxies Tencent CodeBuddy with OpenAI and Anthropic compatible APIs
Go SDK for Claude agents over the Claude Code CLI
GitHub Copilot proxy translating to Anthropic/OpenAI APIs with usage dashboard
Claude Code reverse engineering
Converts Cursor into an OpenAI-compatible API
Deobfuscated Claude Code v2.1.76 TypeScript reconstructed from the npm package
Locally runnable build of the leaked Claude Code source
Unofficial Rust SDK speaking the Claude Code CLI control protocol
Kiro API proxy with OpenAI and Anthropic compatible endpoints
Go port of the Claude Agent SDK driving the Claude Code CLI protocol
OpenAI Codex API proxy with format conversion and dashboard
Cursor chat API reverse proxy
Unofficial Linux port of the MiniMax Agent desktop app
Bun local API that exposes Codex, Kiro and Copilot subscriptions as a Claude-compatible endpoint
Exposes ChatGPT desktop app's internal browser bridge as an MCP server
Go proxy bridging the Trae IDE API to the OpenAI standard API
Transforms Antigravity into standard Claude and Gemini APIs
Go SDK for Claude Code with tool use, MCP and streaming
Go server turning GitHub Copilot into OpenAI/Anthropic-compatible API
Go Cursor-to-OpenAI API bridge with Messages/Responses/Tools support
Reverse engineering of the Qoder CLI
Deno port of Augment2Api
Exposes Trae Work CN credits as local OpenAI/Anthropic API
Desktop coding agent app for macOS and Linux modeled on reverse-engineered Claude Code Desktop
Runtime launcher enabling hidden client flags (Fast mode) in Codex/ChatGPT Desktop
GitHub Copilot to OpenAI API
Self-hosted Kiro API proxy with OpenAI/Anthropic endpoints and admin dashboard
REST API that sends prompts with images to Windsurf chat
Mirror of the leaked Claude Code source
Reverse engineered GitHub Copilot API plus CLI
MITM proxy for Windsurf IDE that swaps the LLM backend for your own Anthropic key
Self-hosted GitHub Copilot to OpenAI-compatible proxy with OAuth
Cursor subscription as OpenAI API via direct agent.v1 protocol
Reverse-engineered spec of the OpenAI Codex CLI harness: loop, tools, compaction
Claude Max subscription as OpenAI-compatible API with tool calling
Reverse proxy for GitHub Copilot API with OpenAI/Anthropic endpoints
Rust Kiro relay speaking Anthropic, OpenAI, Responses and Gemini protocols
Research repo for @anthropic-ai/claude-code v2.1.88 reconstructed from the npm package and sourcemap
Agent runtime that runs on your ChatGPT or Claude subscription
Use a Gemini plan via Gemini CLI auth inside GitHub Copilot
Rust CLI reverse proxy exposing Antigravity Cloud Code as OpenAI/Claude/Gemini APIs
Reverse-engineered Claude Code /buddy companion generation algorithm
Rust Anthropic-compatible proxy over Kiro accounts with web panel
Go proxy to Antigravity's internal Gemini API with quota tracking
Rust proxy translating OpenAI/Anthropic APIs to Claude Code CLI subscription
Cursor subscription to Anthropic/OpenAI endpoint on Cloudflare or Deno
Unofficial GitHub Copilot Chat SDK built on the reverse engineered API
OpenAI-compatible proxy for Antigravity's Gemini and Claude models via OAuth
Protocol documentation for the Claude Code CLI stream-json interface
Research reports from Claude Code source analysis: agent loop, telemetry, permissions
OpenAI-compatible local proxy for Kiro CLI (Amazon CodeWhisperer)
Community reverse-engineered restoration of the Claude Code CLI
Turns a Windsurf subscription into an OpenAI/Anthropic-compatible API
Reverse proxy turning Microsoft 365 Excel Copilot (AugLoop) into an OpenAI API
Undocumented Claude Code internals found by having Claude reverse-engineer itself
Evidence-linked reconstruction of Claude Code internals from the native Bun executable
Reverse-engineered Claude for Chrome extension modified to accept an API key
Anthropic Messages / OpenAI API for Cursor models via the reverse-engineered agent protocol
Local Codex and Claude subscription proxy with web dashboard
Patched Codex Desktop Computer Use backend for NixOS + niri
Reverse-engineered Claude Code Remote Control / Sessions API
Reverse-engineered Cursor tab completion client
Async Python client for Google Antigravity's internal API
Translates Anthropic Messages API to the Codex backend Responses API via Codex device-flow auth
OpenAI-compatible proxy over ChatGPT/Codex subscription backend using the Codex CLI OAuth flow
Gemini CLI reverse proxy speaking to raw Cloud Code Gemini endpoints
Architecture docs reverse-engineered from Claude Code v2.1.83
Diffs Claude Code binaries between releases to surface unreleased features
Reverse engineering Claude Code's minified cli.mjs with LLMs
OpenAI Responses-compatible proxy using Codex/ChatGPT subscription auth