Claude Code is unusable for complex engineering tasks with the Feb updates (github.com) AI

A GitHub issue on Anthropic’s Claude Code reports a quality regression for complex engineering work after February updates, with the reporter saying the model began ignoring instructions, making incorrect “simplest fixes,” and performing worse long-session tool workflows. The author attributes the change to reduced “extended thinking” (including a staged rollout of thinking content redaction) and provides log-based metrics showing less code reading before edits and increased stop/“hook” violations. They say the behavior has made Claude Code “unusable” for their team and ask for transparency or configuration to ensure deeper reasoning for power users.