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Claude Code looping on the same edit means one of three things: lost context, a failing command, or a vague task. Here is the fix for each.

Claude Code has a native -w flag for git worktrees. Run a refactor and a feature in parallel, each in its own files, with no merge pain.

A sub-agent runs in its own context window and hands back a summary. Here is the one rule for when to spawn one, with three worked examples.

Claude Code writes tests that pass without checking anything. Write them before the code, lock the assertions, and keep the tests worth running.

Most of a Claude Code bill is Opus doing work Sonnet handles fine. Here is the routing rule that fixes it, plus how to confirm caching works.

The five sections that shift how Claude Code works in your repo, plus what to leave out so the file stays under 200 lines.

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A sub-agent runs in its own context window and hands back a summary. Here is the one rule for when to spawn one, with three worked examples.