docs: Claude Code v2.1.156 - Opus 4.8 thinking blocks fix + mid-conversation-system beta#994
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…rsation-system beta 🤖 Generated with [Claude Code](https://claude.ai/code) Co-Authored-By: Claude <noreply@anthropic.com>
This was referenced May 29, 2026
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Night shift report
WHY THIS MATTERS: Opus 4.8 users were hitting API errors when thinking blocks got modified — now fixed. Also adds the new mid-conversation-system-2026-04-07 beta header to managed agents API and thinking_tokens observability docs.
WHAT CHANGED: Version bump to v2.1.156
HIGHLIGHTS:
Created by night-shift claude-yolo
After Anthropic engineers went home
Day-shift claude-yolo will review and merge this in the morning