Ask Claude to Explain a Confusing Diff So You Understand What Changed and Why

Some diffs are hard to read — lots of files changed, unfamiliar code, or a refactor that moves things around. Instead of spending 30 minutes tracing the logic yourself, ask Claude to explain it.

"Explain what this commit does — walk me through each change:"
# Then paste the diff, or:
git show abc123 | claude -p "explain what this commit does"

Claude reads the diff and gives you a narrative explanation — not a line-by-line review, but a coherent story of what changed and why it all fits together.

This is different from a code review:

• Code review — "Is this code good? Are there bugs?"
• Diff explanation — "What does this code do? Help me understand it."

Use it when:

# A teammate's commit is confusing
"Explain the changes in the last 3 commits on the feature/auth branch"

# A merge brought in many changes
"Walk me through what this merge added to main — focus on what's new, 
not what moved"

# A dependency update changed generated files
"Explain what changed in the lock file update — which packages were 
added, removed, and updated?"

# You need to understand a hotfix before deploying
"Explain this hotfix diff — what was broken and how does this fix it?"

For large diffs, ask Claude to focus on what matters:

# Skip the obvious stuff
"Explain only the non-trivial changes — skip import reordering, 
formatting fixes, and boilerplate"

# Group by purpose
"Explain these changes grouped by feature, not by file"

# Summarize at different levels
"Give me a one-paragraph summary, then a detailed breakdown by file"

Reading diffs is a skill. Having Claude explain them is a shortcut — understand changes in minutes instead of tracing code for half an hour.

via Claude Code