Tip: Claude Code /effort high + 'ultrathink' Forces Full Extended Thinking — Community-Validated 10-Tip Sheet

r/ClaudeAI·medium signal

A practitioner-validated tip sheet (254 upvotes, r/ClaudeAI) reveals that combining /effort high with 'ultrathink' in your prompt forces Claude Code to engage full extended thinking chains, producing significantly better results on complex reasoning tasks. The tip sheet covers 10 patterns total including strategic use of Plan Mode, CLAUDE.md optimization, and agent team coordination. The 'ultrathink' trigger specifically extends the internal reasoning budget beyond the default /effort high setting.