Git rerere

Skill narenaryan/agent-skills/skills/git/git-rerere

Byte-sized agent skills for giving advanced knowledge to AI agents

Install

npx -y skills add narenaryan/agent-skills --skill git-rerere

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Use when the same merge conflicts keep recurring across rebases or long-running integration branches — enables automatic replay of previously-recorded resolutions

SKILL.md

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Git Rerere (Reuse Recorded Resolution)

Rerere fingerprints conflict hunks + resolutions. On any later merge/rebase/cherry-pick producing the same conflict, Git auto-applies the stored fix.

Enable

git config --global rerere.enabled true
git config --global rerere.autoupdate true   # also stage auto-resolved files

Storage: .git/rr-cache/<hash>/{preimage,postimage}. Local, not pushed.

Commands

git rerere status         # files with recorded preimages
git rerere diff           # current vs recorded resolution
git rerere remaining      # unresolved files
git rerere forget <file>  # discard a recorded resolution
git rerere gc             # prune old entries

Flow

First conflict: Recorded preimage for 'file'.
Resolve + commit: Recorded resolution for 'file'.
Next time the same conflict appears: Resolved 'file' using previous resolution. — with autoupdate, already staged.

Canonical Uses

Long-running topic branch rebased onto main repeatedly.
Nightly integration branches that merge many topics, reset, re-merge.

Test-merge-and-reset to pre-record resolutions:

git merge feature && git reset --hard HEAD~
# resolution is recorded; next merge applies it automatically

Sharing

rr-cache isn't pushed. Copy between checkouts:

rsync -a .git/rr-cache/ other-repo/.git/rr-cache/

Pitfalls

Matches exact conflict content — whitespace/ordering drift breaks the match. Check git rerere diff before trusting auto-resolution.
With autoupdate=true, a bad past resolution silently re-applies. Spot-check.
Auto-resolved files show no conflict markers; use git rerere forget <file> to re-surface for manual redo.