Claude misdiagnoses Mac firewall as disabled, then overestimates screen lock security
The author tested Claude’s ability to self-diagnose Mac security settings and found two critical errors. First, the AI confidently reported the firewall as disabled (state = 0) and provided an admin command to enable it. Manual verification in the terminal revealed the firewall was actually enabled (state = 1). The AI misinterpreted the sandbox’s silence as a zero-value response, a common…
Key points
- Claude incorrectly reported Mac firewall as disabled (state = 0) when it was enabled (state = 1)
- AI failed to verify screen lock settings, requiring manual screenshot confirmation for accuracy
- Only one real security hole found: disk encryption was turned off, unlike Windows version’s 2FA flaw
Second, Claude incorrectly stated it could not verify screen lock settings, leading the author to suspect the feature was disabled. Further investigation required two commands and a screenshot of the settings screen to confirm the lock was set to the strictest level. The author emphasizes the danger of AI providing numerical or binary answers without transparency about its visibility limits, urging users to cross-check AI reports with direct system checks. The only real security flaw found was disk encryption being off, contrasting with the Windows version where two-factor authentication was disabled instead.
I Tried Self-Diagnosing My Mac's Security with Claude Code | This Time, the AI Was Confidently Wrong
note.com · 24 October 2026
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