Claude Code's [cyber] false positive triggers silent model downgrades via recovery UI
Atlass-OS · ghdev · 2026-08-30
- The Bug: Claude Code (Fable 5) incorrectly blocked a user from writing a regression test for their own security fix using a [cyber] safeguard flag.
- The Critical Flaw: The recovery UI suggests "Switch to Opus 4.8" as a primary action. This triggers a silent downgrade where the agent continues running on the older model but still labels commits as Fable 5, making it undetectable without forensic auditing.
- Impact: This hidden integrity issue compromises long-running sessions, especially those involving oversight or review, as there are no visible symptoms of the downgrade.
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