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Issue: Claude Code is unusable for complex engineering tasks with Feb updates

9.8 relevance
Score Breakdown
technical depth
9
novelty
8
actionability
8
community
10
strategic
9
personal
10

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GitHub issues on Claude Code limitations, directly about AI coding agent challenges.

AI/ML github.com
Preflight Checklist I have searched existing issues for similar behavior reports This report does NOT contain sensitive information (API keys, passwords, etc.) Type of Behavior Issue Other unexpect...
Summary

Quantitative analysis of 17,871 thinking blocks and 234,760 tool calls across 6,852 sessions reveals that Claude Code's quality for complex engineering tasks regressed in February 2026 as thinking depth dropped ~67% (Pearson r=0.971 with signature length) before the redact-thinking rollout. The staged redaction (1.5%→100% over a week) made this invisible, coinciding with a behavioral shift from research-first to edit-first tool usage, causing incorrect claims and ignored instructions.