Issue: Claude Code is unusable for complex engineering tasks with Feb updates
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GitHub issues on Claude Code limitations, directly about AI coding agent challenges.
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.
Audit thinking token allocation and behavioral metrics in AI coding assistants to detect regressions in complex task performance.
As a senior engineer relying on AI agents for complex code modification, this regression directly impacts the reliability of your orchestrated workflows and tooling decisions.