Tools for Codex / OpenAI

by Jesse Vincent - A strong bundle of core competencies for software engineering, with good coverage of a large portion of the SDLC - from planning, reviewing, testing, debugging... Well written, well organized, and adaptable. The author refers to them as "superpowers", but many of them are just consolidating engineering best practices - which sometimes does feel like a superpower when working wit

by Affaan Mustafa - Top-notch, well-written resources covering "just about everything" from core engineering domains. What's nice about this "everything-" store is most of the resources have significant standalone value and unlike some all-encompassing frameworks, although you can opt in to the author's own specific workflow patterns if you choose, the individual resources offer exemplary patterns

Python / TypeScript - Self-improving AI agent with autonomous skill creation, persistent memory, multi-platform messaging, and subagent delegation

AutoGPT provides accessible AI tools for building and using AI agents, offering a comprehensive framework including Forge for agent creation, agbenchmark for performance evaluation, a leaderboard for competition, a user-friendly UI, and CLI for seamless integration and management github | github profile

World's largest open-source prompt library. 1000s of prompts for all major models

February 2026 release making human oversight a native workflow primitive: suspend execution at critical decision points, expose review-and-edit UI mid-flow, and route subsequent execution based on human action (approve/reject/escalate). Demonstrates how HITL transitions from bolt-on approval gates to first-class execution-graph nodes with stateful pause/resume backed by Celery workers and Redis Pu

User-friendly AI Interface (Supports Ollama, OpenAI API, ...)

An effortless way to experiment and prototype LangChain flows with drag-and-drop components and a chat interface

(132.1k ⭐) - Cross-platform desktop assistant for Claude Code, Codex, OpenCode, OpenClaw, Grok Build, and Hermes Agent

Langchain integrates various providers like Anthropic, AWS, and OpenAI, and offers tools for components such as LLMs, chat models, and data analysis, supporting functionalities from Alpha Vantage to YouTube github | docs

GitHub's open-source toolkit for spec-driven development: spec.md → plan.md → tasks.md artifacts convert natural-language intent into a machine-checkable plan before any code is written, with /specify, /plan, /tasks, and /implement commands that run across Claude Code, Copilot, Codex, and Gemini CLI. The clearest reference implementation of treating spec/plan/task documents — not the prompt — as t

Collection of production LLM applications with source code across RAG, multi-agent, and tool-use patterns. Good reference for how harness primitives combine in real applications

(67.0k ⭐) - AI coding assistant skill (Claude Code, Codex, OpenCode, OpenClaw, Factory Droid, Trae)

OpenAI's official autonomous coding agent CLI — the open-source reference implementation of the Codex harness with sandboxed tool execution, multi-file editing, and a streaming agent loop. Worth studying because it is the most widely adopted terminal-native coding agent harness and exposes the same loop architecture that OpenAI documents in its harness engineering posts

by Julius Brussee - A plugin that conserves message tokens by communicating in fragmented "caveman speak" - sort of a clever form of compression. Now accompanied by a whole caveman ecosystem including a memory system, caveman spec kit, and a caveman agent

Production-grade engineering skills for AI coding agents, packaged as 24 reusable skills covering the full development lifecycle from /spec to /ship. The slash-command interface and context-aware auto-activation make it a concrete reference for turning senior-engineering judgment into agent-executable harness artifacts

The AI orchestrator for running Codex, Claude Code, OpenCode, and Pi side-by-side in isolated git worktrees. It turns fleet-of-agents execution into a polished desktop IDE with a mobile companion, making parallel agent harness design accessible beyond shell-scripting teams

Robust Speech Recognition via Large-Scale Weak Supervision

Self-hosted platform where agents wake on heartbeats to claim tickets, governed by org charts, budgets, and approval gates.

(82.2k ⭐) - A Claude Code plugin that automatically captures everything Claude does during your coding sessions, compresses it with AI (using Claude's agent-sdk), and injects relevant context back into future sessions

Frontend design taste skill collection covering premium UI generation, redesign audits, GSAP motion, Stitch design systems, minimalist and brutalist visual modes, and full-output enforcement

OpenDevin is an open-source initiative aimed at replicating and enhancing the autonomous AI software engineer Devin, focusing on collaboration and complex task execution in software development, emphasizing its relevance to advancing agentic AI technologies github | github profile

by tt-a1i - An Agent Skill for Claude Code that generates interactive architecture, workflow, sequence, data-flow, and lifecycle diagrams as standalone HTML. Typed JSON, local renderers, and delivery checks support source-linked node details, path tracing, themes, and export

(59.1k ⭐) - Claude Code skills that turn any codebase into an interactive knowledge graph you can explore, search, and ask questions about (Multi-platform e.g., Codex are supported)

Light and Fast AI Assistant. Support: Web | iOS | MacOS | Android | Linux | Windows

Lobe Chat - an open-source, modern-design AI chat framework. Supports Multi AI Providers( OpenAI / Claude 3 / Gemini / Ollama / DeepSeek / Qwen), Knowledge Base (file upload / knowledge management / RAG ), Multi-Modals (Plugins/Artifacts) and Thinking. One-click FREE deployment of your private ChatGPT/ Claude / DeepSeek application

Intelligent routing across multiple LLM providers with load balancing, intelligent fallbacks, rate limiting, and response caching. Achieves 40–60% token cost reduction through smart model routing (cheap models for simple tasks, capable models for complex reasoning). Essential infrastructure for harnesses operating under strict cost budgets where model selection is a per-turn decision

Agent orchestration platform -- deploy multi-agent swarms, coordinate autonomous workflows, distributed swarm intelligence, RAG integration

The definitive open-source guide and resource hub. 3M+ learners. ~55K+ ⭐

AI-powered job search orchestrator built on Claude Code. 14-skill pipeline that evaluates jobs, generates ATS-tailored PDFs, and tracks applications. Local-first, MIT

30 curated skills + 832 SaaS automation templates via Composio. Strong on document processing, creative, and business skills

Official recipes for prompts, tools, RAG, and evaluations

(54.9k ⭐) - Local code knowledge graph for Claude Code, Codex, Gemini, Cursor, OpenCode, Antigravity, Kiro, and Hermes Agent

Documented system prompts from Anthropic - Claude Fable 5.1, Opus 5.5, Claude Design, Claude Code. OpenAI - ChatGPT GPT-6-Astra, Codex. Google - Gemini 3.8 Flash, 3.1 Pro, Antigravity. xAI - Grok, Grok Bot, Cursor, Kimi and more! Updated regularly.

Mem0 is an intelligent memory layer for Large Language Models that enhances personalized AI experiences by retaining and utilizing contextual information across various applications. github | website | docs | discord | twitter | github profile | linkedin

by Cathryn Lavery - Another welcome contribution to the domain of making Claude Code output look stylish, this collection of skills produces a variety of editorial diagrams in the form of self-contained HTML + SVG. Although I never thought I'd hear these words together, according to the author: "no Mermaid-slop."

(24.1k ⭐) - A Claude Code skill that removes signs of AI-generated writing from text, making it sound more natural and human

Unified proxy and SDK that routes to 100+ LLM providers behind a single OpenAI-compatible interface, with a Router handling retry/fallback across deployments, per-project cost and rate-limit tracking, and OTEL callback integrations. The right infrastructure layer when your harness needs provider resilience (automatic failover on 429/500 errors), budget guardrails, or the ability to swap models wit

Microsoft's multi-agent conversation framework with a complete AgentChat layer covering agent loop, tool integration, termination conditions, and human-in-the-loop. The most comprehensive open-source reference for large-scale multi-agent harness design

(33.3k ⭐) - Marketing skills for Claude Code and AI agents. CRO, copywriting, SEO, analytics, and growth engineering

PrivateGPT is a secure, offline-capable AI tool for querying documents with Large Language Models, offering high-level and low-level APIs for privacy-conscious, context-aware application development github

(51.2k ⭐) - API service that wraps Antigravity, Codex, Claude Code, and Grok Build behind OpenAI-, Gemini-, Claude-, and Codex-compatible endpoints

by K-Dense - "A set of ready-to-use Agent Skills for research, science, engineering, analysis, finance and writing." That's their description - modest, simple. That's how you can tell this is really one of the best skills repos on GitHub. If you've ever thought about getting a PhD... just read all of these documents instead. Also I think it IS an AI agent or something? Awesome

Flowise simplifies the creation of applications leveraging large language models (LLMs) by providing a drag-and-drop interface for customizing AI workflows, offering easy installation, Docker support, development tools, and documentation for integrating various functionalities such as authentication, streaming, and custom tools to enhance AI agents' capabilities github | website | docs | github pr

GPT-Engineer is an AI-powered tool allowing users to specify software in natural language, automatically generating and executing code, with options for improvement suggestions, and fostering collaboration within the open-source community github | github profile | website

Port of OpenAI's Whisper model in C/C++

Obsidian-focused skills for markdown, Bases, JSON Canvas, CLI workflows, and content cleanup

Drop-in OpenAI API replacement. No GPU required

AI pair-programmer harness with an Architect mode that splits planning (one LLM) from coding (another), and git-aware tooling that uses version control as the undo mechanism instead of custom state rollback. The best reference for multi-file editing tool design and planner/coder layer separation

Alibaba's production-grade code review agent combining deterministic pipelines with LLM reasoning: built-in fine-tuned rules catch NPE, thread-safety, and injection vulnerabilities at line-level precision, while the LLM layer handles nuanced design feedback. Demonstrates how hybrid harnesses can outperform purely model-driven or purely static-analysis approaches by assigning each layer the problem

Installable library of 1,400+ agentic skills for Claude Code, Cursor, Codex CLI, Gemini CLI, and more. The largest community-driven skill catalog with an npm installer and role-based bundles — a concrete reference for treating skills as versioned harness artifacts rather than ad-hoc prompts

High-performance code intelligence MCP server that full-indexes repositories into a persistent knowledge graph via tree-sitter AST analysis across 66 languages. Replaces dozens of file-read/grep cycles with sub-millisecond structured queries, cutting active tokens by 120× and turning codebase navigation from a context-pressure problem into a pointer-chasing problem

Background runtime that owns your agents' terminals: sessions survive reboot and reattach from any terminal or SSH, panes are marked working/blocked/idle, and agents themselves spawn panes and prompt each other over a CLI and socket API. One Rust binary.

Self-hosted multi-model chat. All major providers

OpenAI-compatible proxy that stacks the free tiers of 28 LLM providers (~4B free tokens/month) behind one /v1 endpoint — smart routing, automatic failover, encrypted keys

Python - Agentic IM chatbot infrastructure with broad IM platform support, LLM integrations, plugins, and AI features

Sub2API 一站式开源中转服务，让 Claude、Openai 、Gemini、Grok订阅统一接入，支持拼车共享，更高效分摊成本，原生工具无缝使用。

Jan is an open-source, development-stage ChatGPT alternative that operates fully offline on diverse hardware platforms, supporting universal architectures from PCs to multi-GPU clusters github | github profile

(29.2k ⭐) - Design skill and CLI for building, auditing, and redesigning interfaces with checks for common AI-generated design patterns

LangGraph is a Python library facilitating the construction of stateful, multi-actor applications with LLMs, enabling cyclic coordination across multiple computation steps, particularly suited for agent-like behaviors, while also providing streaming support, and various guides and examples for implementation and usage github

Cross-harness plugin marketplace that maintains one source-of-truth plugins/ directory and generates harness-native artifacts for Claude Code, Codex CLI, Cursor, OpenCode, Gemini CLI, and GitHub Copilot. It is the clearest practical example of treating reusable agent capabilities as a portable distribution format rather than ad-hoc prompt files

Arm Cloud Migration Assistant accelerates moving x86 workloads to Arm infrastructure. It scans the repository for architecture assumptions, portability issues, container base image and dependency incompatibilities, and recommends Arm-optimized changes. It can drive multi-arch container builds, validate performance, and guide optimization, enabling smooth cross-platform deployment directly inside G

Connect and unify data across various platforms and databases with MindsDB as a single MCP server

Opiniated RAG for integrating GenAI in your apps 🧠 Focus on your product rather than the RAG. Easy integration in existing products with customisation! Any LLM: GPT4, Groq, Llama. Any Vectorstore: PGVector, Faiss. Any Files. Anyway you want

Your AI second brain. Self-hostable. Get answers from the web or your docs. Build custom agents, schedule automations, do deep research. Turn any online or local LLM into your personal, autonomous AI (gpt, claude, gemini, llama, qwen, mistral) github | website

Harness control surface available as web, mobile, and desktop app. Claude Code, Codex, Cursor, Grok Build, OpenCode.

The most widely adopted self-hostable LLM observability platform: traces every agent step, manages prompt versions, and runs evals in one tool. Preferred over cloud-only alternatives when data residency or cost control is a constraint

1,000+ agent skills from official dev teams and community. Works with Codex, Claude Code, Gemini CLI, Cursor

Agents are first-class members of shared channels on a Nostr relay you own, with their own keys and audit trails. Claude Code, Codex, Goose.

Draw and edit draw.io diagrams from your project's files on a live browser canvas you can also edit by hand, with version history, undo, AWS, Azure and GCP shape libraries and PNG or SVG export

A modular graph-based Retrieval-Augmented Generation (RAG) system

Continue is an open-source autopilot plugin for VS Code and JetBrains, enhancing coding with LLMs through features like task and tab autocomplete, natural language edits, file generation, and customization options, available under the Apache 2.0 license github | website

AgentGPT allows users to configure and deploy autonomous AI agents, enabling them to name their own custom AI and guide it towards any desired goal through task execution and learning github | github profile

753 cybersecurity skills across 38 domains: cloud security, pentesting, red teaming, DFIR, malware analysis, threat intel, and more (MITRE ATT&CK mapped)

Official plugin to use Codex from Claude Code for code reviews and task delegation

Open-source desktop client that runs multiple agent CLIs (Claude Code, Codex, Gemini CLI, Qwen Code) side by side, with multi-session chat, MCP and ACP support, and local file management

Workflow layer for OpenAI Codex CLI: stronger default sessions, reusable skills, native hooks, HUD/status surfaces, project guidance, and team-style execution commands.

GPT Pilot is an open-source AI developer tool that aims to provide a comprehensive development companion, capable of writing features, debugging, and interacting with users, presenting itself as an alternative to Devin, the world's first AI software engineer developed by Cognition Labs github | discord

MCP server that intercepts raw tool output before it enters the context window, sandboxing bulky data (Playwright snapshots, GitHub issues, logs) outside the LLM and retrieving only relevant fragments via BM25 when needed. The "think in code" paradigm — replacing ten file-read tool calls with one script execution — is a concrete harness pattern for turning context pressure into a programming probl

OfficeCLI is the first and best Office suite purpose-built for AI agents to read, edit, and automate Word, Excel, and PowerPoint files. Free, open-source, single binary, no Office installation required.

Gives Gemini CLI a real Firefox to drive from plain-English instructions: opens pages, clicks, types, reads and screenshots through the real pointer and keyboard. Open source, MIT. Install via gemini extensions install https://github.com/feder-cr/AIHawk

(23.7k ⭐) - Routes Claude Code, Codex, Cursor, Cline, and other coding agents to dozens of model providers with automatic fallback

Wraps 250+ SaaS APIs (GitHub, Slack, Linear, Notion, etc.) as agent-ready actions with managed OAuth, so tool integration becomes a one-line import rather than a custom harness component per service. The fastest path from "the agent needs to call an external API" to a production-grade, authenticated tool

Curated list of AI agents and agent frameworks, organized by use case. Useful for surveying the landscape of what harnesses are being built around

Lightweight multi-agent framework built around handoffs and guardrails; the production successor to Swarm. Complements LangGraph for harnesses where delegation patterns are simpler than full graph orchestration

Persistent memory server for coding agents that retrieves only the top-K relevant observations via hybrid BM25 + vector + graph search instead of loading a whole memory file into context (~1,900 vs 22K+ tokens at 240 observations, 92% fewer). Reports 95.2% R@5 on LongMemEval-S with a local embedding model, plus a reproducible eval harness to check that claim. One server serves 20+ agents (Claude C

FastGPT is a knowledge-based platform built on the LLMs, offers a comprehensive suite of out-of-the-box capabilities such as data processing, RAG retrieval, and visual AI workflow orchestration, letting you easily develop and deploy complex question-answering systems without the need for extensive setup or configuration

192 production-ready skills across 9 domains (engineering, marketing, product, compliance, C-level advisory) with 254 Python automation tools. 5,300+ stars

(17.2k ⭐) - A Claude Code Skill that turns prompts into horizontal-swipe magazine-style HTML decks

Open-source terminal AI agent optimized for Qwen3-Coder; multi-protocol support (OpenAI/Anthropic/Gemini APIs), 1,000 free requests/day. ~21K+ ⭐

Microsoft C# SDK to integrate cutting-edge LLM technology quickly and easily into your apps

Open-source Cursor alternative (VS Code fork); any model or local hosting with change visualization. ~28K+ ⭐

A Ghostty-based macOS terminal with vertical tabs and notifications for AI coding agents. Features notification rings, in-app browser, SSH support, and Claude Code Teams integration

Kanban-based orchestration for 10+ coding agents (Claude Code, Codex, Gemini CLI, Copilot, Amp). Isolated git worktrees per agent, inline diff review. 23,200+ stars

Official skills catalog: .system, .curated, and .experimental skills. The authoritative upstream source

Huashu Design 3.0 · 在 agent 里打一句话，拿回能交付的设计：网页 / App 原型 / 可编辑 PPTX / 动画 / 信息图 · 六个候选挑三个方向 · 84 种带样张的风格库 · 越用越懂你的外观账本与设计体检 · HTML-native design skill for Claude Code, Codex, Cursor & any agent

OpenAI's orchestration layer for moving from supervising coding agents to managing work: it monitors an issue tracker, creates isolated per-issue workspaces, and surfaces proof-of-work artifacts (CI status, review feedback, walkthrough videos) as the handoff signal. The spec deliberately leaves sandbox and approval policies implementation-defined so teams can match trust posture to environment, an

(23.3k ⭐) - Claude Code skill implementing Manus-style persistent markdown planning — the workflow pattern behind the $2B acquisition

The leading TypeScript toolkit for building AI agents (20M+ monthly downloads, 25+ provider integrations). AI SDK 6 introduced a first-class Agent abstraction with ToolLoopAgent for production-ready tool execution loops, DevTools for local debugging, full MCP support, and type-safe UI streaming. The unified API across OpenAI, Anthropic, Google, and AWS Bedrock makes it the default choice for TypeS

SpaceXAI's open-source terminal coding agent harness: a Rust-based fullscreen TUI with an extensible tool runtime, MCP/skills/hooks support, and headless/embedded modes via ACP. A useful first-party counterpoint to Claude Code and Codex CLI for studying how a new model provider structures the loop, checkpoints workspace state, and exposes the same harness through interactive and scripted surfaces