OpenAI encrypts Codex agent instructions, raising developer concerns

Jul 15, 2026

OpenAI has encrypted the MultiAgentV2 messages used by its Codex agent, making it difficult for developers to read the instructions exchanged between agents. Developers have expressed concerns that this change could make debugging and auditing more challenging. The encryption is reportedly intended to prevent prompt injection attacks, but it also reduces transparency.

Why it matters: Reduced transparency could make it harder for developers to verify and trust agent behavior.

Full story at: The Register / AI & ML ↗