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GPT-6 Astra era prompts rethink skills and instructions

OpenAI Codex developer experience lead Eric Provencher says the arrival of GPT-6 Astra makes it necessary to rethink how prompts are written for coding agents. He says guidance that worked before can now get in the way as model performance improves. He points to “skills” saved as markdown files and AGENTS.md instructions, warning that too many or overly long descriptions can be compressed and make selection harder, while conflicting guidance can pull in irrelevant instructions.