Simon Willison 3/17/2026

Use subagents and custom agents in Codex

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The article announces the general availability of subagents in OpenAI Codex, detailing default agents like 'explorer' and 'worker' and explaining how to define custom agents via TOML files. It covers their use for tasks such as debugging and code fixes, compares the feature to other platforms like Claude Code and Gemini CLI, and references an updated guide on Agentic Engineering Patterns.

Use subagents and custom agents in Codex

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