Best Agent Development Environments (ADE) for Codex CLI

Emdash is an open-source AI coding agent orchestration platform designed to help developers coordinate parallel software development activities. The application provides a unified workspace for launching, monitoring, and managing multiple coding agents, including Claude Code, Codex, Cursor, Gemini CLI, and other supported command-line tools. Each agent runs within a dedicated Git worktree containing its own branch, terminal session, conversation history, and code review state. This architecture enables developers to assign independent programming tasks to different agents while keeping their file modifications separated. Emdash includes a built-in browser for previewing local development servers, remote applications, and web pages without leaving the development workspace. Its version control tools support inspecting code differences, creating commits, pushing changes, opening pull requests, and monitoring continuous integration checks. Developers can configure scheduled automations for recurring activities such as bug investigations, release preparation, and repository maintenance. The platform integrates with issue tracking services such as Linear, Jira, GitHub, Notion, and Asana to provide agents with task information and project context. Emdash also supports remote development through SSH connections, reusable prompts, agent skills, MCP server configurations, and persistent terminal sessions.

Air is a development environment developed by JetBrains that empowers developers to assign coding responsibilities to various AI agents and coordinate their efforts within a cohesive workspace. Rather than acting merely as a chat-based helper, it serves as a comprehensive development platform where tools are centered around AI agents, allowing users to guide, oversee, and enhance the results they produce more efficiently. Developers have the ability to operate multiple agents simultaneously, with each focused on distinct tasks in separate environments, which aids in avoiding conflicts and boosts productivity when managing intricate projects. It facilitates integration with a variety of AI systems, including Claude, Gemini, Codex, and other coding agents, thus supporting adaptable, model-agnostic workflows through a unified interface. Users can articulate tasks with detailed context by referencing particular files, commits, classes, or code components, which ensures that the agents yield more precise and pertinent outcomes grounded in the actual codebase. This innovative approach not only streamlines the development process but also enhances collaboration between human developers and AI, paving the way for more efficient software creation.