Codex has implemented encryption for sub-agent prompts, a security measure aimed at protecting intermediate instructions passed between AI agents during complex tasks.
The update addresses concerns about prompt visibility in multi-agent systems where initial requests are broken into smaller sub-tasks. Each agent now receives encrypted instructions rather than plaintext prompts, reducing exposure of internal reasoning patterns and proprietary logic.
The change affects how Codex handles task decomposition. When a primary agent delegates work to sub-agents, those delegation instructions are now encrypted using a shared key system. This prevents unauthorized access to intermediate steps while maintaining functional clarity within the Codex framework.
The implementation emerged from GitHub issue #28058, generating significant community discussion on Hacker News with 96 comments and 146 upvotes. Users debated trade-offs between security, debugging transparency, and system observability.
Codex developers noted the encryption applies to inter-agent communication only, not to user-facing inputs or final outputs. The measure aims to balance security improvements with operational transparency for legitimate monitoring needs.
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