Codex Begins Encrypting Sub-Agent Instructions
The Decoder · rss · 2026-07-15
The Decoder reports that since early June, OpenAI's Codex has been encrypting instructions sent from the main agent to sub-agents, preventing developers from tracking how internal tasks are divided and delegated.
The article also points out that for the larger GPT-5.6 variants, Sol and Terra, this encryption is mandatory. For developers, this means Codex's internal collaboration process has become invisible. To the outside world, it raises a question: when intermediate instructions between agents are unauditable, debugging, governance, and security investigations become significantly harder.
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