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claude-code - 💡(How to fix) Fix Claude omits modified files when staging commits with new files

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When committing a new feature, Claude staged new files but failed to stage modifications to existing files that the new code depends on. This resulted in a commit that broke compilation after merge.

Root Cause

Claude used explicit paths when staging new files rather than reviewing git diff to identify all related changes. Modified files with required supporting code were left unstaged.

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Description

When committing a new feature, Claude staged new files but failed to stage modifications to existing files that the new code depends on. This resulted in a commit that broke compilation after merge.

What happened

  1. User asked Claude to commit a new feature
  2. Claude staged NEW files (e.g., lib/foo/bar.ex)
  3. Claude did NOT stage MODIFIED existing files (e.g., lib/foo.ex) that contained functions the new code calls
  4. Pre-commit hooks passed (working directory still had unstaged changes)
  5. After merge, compilation failed with "undefined function" errors

Root cause

Claude used explicit paths when staging new files rather than reviewing git diff to identify all related changes. Modified files with required supporting code were left unstaged.

Expected behavior

Before committing, Claude should:

  1. Review git diff for ALL unstaged changes related to the work
  2. Verify staged changes are self-contained (no undefined function calls)
  3. Ideally test compilation of staged-only changes

Model

claude-opus-4-5-20251101

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FAQ

Expected behavior

Before committing, Claude should:

  1. Review git diff for ALL unstaged changes related to the work
  2. Verify staged changes are self-contained (no undefined function calls)
  3. Ideally test compilation of staged-only changes

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claude-code - 💡(How to fix) Fix Claude omits modified files when staging commits with new files