Claude Code Tool Patterns & Gotchas

Extracted: 2026-02-09 (consolidated 2026-02-10) Context: Claude Code のツール使用時に発生しがちな問題とその回避策

1. Large File Write Performance

Problem

Very large files (>3000 lines) in a single Write tool call become extremely slow and may appear to hang.

Symptoms:

• Write operation takes >60 seconds
• User interrupts thinking it's stuck
• No feedback on progress

Solution