Why it matters
NVIDIA walks through a simulated Go dependency that detects Codex, writes a malicious AGENTS.md, redirects the coding task, and injects instructions intended to conceal the change from pull-request summaries. The post then maps the chain to dependency, configuration-integrity, monitoring, and guardrail controls.
My takeaway: Reproduce this attack path in an isolated test repository: let a setup dependency create or modify agent instructions, verify whether the agent reports the provenance change, and inspect every downstream summary. Pin and scan dependencies, block agent writes to instruction files, alert on unexpected configuration changes, and regression-test concealment attempts.