Zed 为什么不用自己造 Agent？OpenAI 架构师给出答案：Codex 重划 IDE × Coding Agent 的分工边界

Core Insights - Coding Agents are a rapidly evolving area within applied AI, with a focus on maintaining resilience and rapid iteration amidst changing ecosystems [2] - OpenAI's Codex offers a solution through the co-development of models and Harness, emphasizing the importance of understanding model behavior [4][5] Group 1: Composition of Coding Agents - A Coding Agent consists of three main components: user interface, model, and Harness, where the user interface can be command-line tools or integrated development environments [4] - The model refers to recent releases like the GPT-5.1 series, while the Harness acts as the core agent loop that interacts with the model [4] Group 2: Challenges in Building Harness - Building an efficient Harness is complex, facing challenges such as adapting to new tools that the model may not be familiar with, and managing prompt adjustments based on model characteristics [8][9] - Delays in model processing and the need for effective prompt design to enhance user experience are significant challenges [9][10] Group 3: Codex as a Harness/Agent - Codex is designed to function across various programming environments, allowing for complex tasks such as navigating code repositories and executing commands [12] - The integration of Codex into an agent system simplifies the development of features like parallel tool calls and security management [12][18] Group 4: Future of Codex and SDK Development - The future of Codex is promising, with expectations for models to handle more complex tasks without supervision, and the SDK evolving to support these capabilities [19] - Companies can leverage Codex to create customized agents, enhancing their products with advanced coding capabilities [15][18]