Claude Code fixed for Opus 4.7 malware bug

Anthropic's Opus 4.7 release hit a snag as aggressive safety guardrails accidentally turned it into an overzealous hall monitor.

• –The "malware" false positives were triggered by stale safety prompts intended for older models but incompatible with Opus 4.7's improved instruction-following.
• –The bug significantly hampered productivity, leading to blocked edits for standard Next.js and Python codebases.
• –This incident highlights the fragility of model-specific system prompts during major model rollouts.
• –Developers are advised to update the Claude Code CLI immediately (`claude update`) or restart any sessions using the 4.7 API.
• –The fix is server-side, but client-side app relaunches are necessary to clear the cached safety instructions.