| name | claude-overlay |
| description | Re-apply and maintain local OMC (oh-my-claudecode) plugin customizations after an update — a guided, step-by-step workflow that first detects what changed upstream (via the marketplace git clone of Yeachan-Heo/oh-my-claudecode), then 3-way merges each patch onto the new version, preserving upstream changes and surfacing conflicts. Make sure to use this skill whenever OMC was updated, upgraded, or reinstalled; when a patched OMC agent or skill (git-master, planner, executor, team, etc.) looks reverted or behaves like the stock version; when you want to know what an OMC update changed in files you have customized; or to verify your local OMC patches are still applied. Run it from the claude-overlay folder after any oh-my-claudecode version bump. |
OMC Patch Maintainer
OMC plugin files live in a versioned cache that is regenerated on every update
(~/.claude/plugins/cache/omc/oh-my-claudecode/<version>/...). Any local edit we
make to those files (e.g. the git-master Project_Skill_Routing block) is lost
when OMC updates to a new version folder. This skill re-applies our patches onto
whatever version is currently active, via a 3-way merge so upstream's own changes
to the file are preserved and any real conflict is surfaced — never silently
clobbered.
When to use
- After updating OMC (
/oh-my-claudecode:omc-setup, plugin update, version bump).
- A previously-patched OMC file (e.g.
git-master.md) appears reverted.
- To verify our local OMC patches are present on the active version.
Guided update workflow (step by step)
When this skill triggers after an OMC update, walk the user through these steps. The scripts
are read-only unless given --write. Pause for the user's confirmation before any step that
writes to the global plugin files — those affect every project, so don't apply silently.
0. Locate. When this skill loads, its directory is shown as "Base directory for this skill"
(typically ~/.claude/skills/claude-overlay, a symlink to the project copy). cd into that
directory first — every command below uses ./ to mean it, and the relative patches/... paths
resolve from there.
1. Did anything change? Compare the active version with what each patch was built against:
- active version =
basename of the install path in ~/.claude/plugins/installed_plugins.json
- baseline version =
cat patches/<name>/baseline-version
If they match and the step-3 dry-run is all OK, the patches survived the update — you're done.
If they differ, an update landed; continue.
2. Understand what upstream changed — before touching anything.
./upstream-changes.sh
This reads the marketplace git clone of Yeachan-Heo/oh-my-claudecode and prints, per patched
file, the upstream commits + diffstat since that patch's baseline version. Summarize for the
user which files drifted and why. This predicts which patches will merge cleanly versus
CONFLICT. Cache-only files (no git history, e.g. skill-bodies/) are flagged — their changes
surface in the merge instead. If the git clone is missing, it prints a GitHub compare URL.
This step explains intent — it is not authoritative for what's on disk. It reads the
marketplace clone, which can lag the active install (the cache may be on v4.15.0 while the clone
is still v4.14.7). The step-3 dry-run is authoritative for the active version. If the two
disagree — upstream-changes.sh says "no changes" but the dry-run reports drift — trust the
dry-run, and diff patches/<name>/baseline.md against the live target to see the real change.
3. Dry-run to see the plan.
./apply.sh
Read each status line: OK (already applied) · CLEAN (will apply; drift noted) · CONFLICT
(upstream touched our lines — needs you) · MISSING (file gone/renamed). The final REMINDER/
WARNING lines summarize drift and missing targets.
4. Apply. Confirm with the user, then pick by what the dry-run showed:
- only
OK → nothing to do.
CLEAN, no drift → ./apply.sh --write.CLEAN with drift → ./apply.sh --write --update-baseline (advances baseline.md,
patched.md, and baseline-version to the new version so future merges stay trivial).
5. Resolve each CONFLICT. Open <target>.merge-conflict. Use the upstream diff from step 2
to understand the intent of upstream's change, combine it with our edit, write the result onto
the target, then re-baseline that patch (see "Resolving a CONFLICT"). Re-run step 3 to confirm
it now reads OK.
6. Investigate each MISSING. The agent/file was removed or renamed upstream. Find where it
went using the marketplace git history:
git -C ~/.claude/plugins/marketplaces/omc log --oneline --name-status \
"$(cat patches/<name>/baseline-version)"..HEAD -- <old-target-dir>/
A rename shows as R, a deletion as D. If renamed → update patches/<name>/target to the new
path and rebuild baseline.md/patched.md/baseline-version against it. If the feature was
removed → retire the patch (delete its folder) and tell the user.
7. Verify. Re-run ./apply.sh. Success is all OK with exit 0, and owned skills
up-to-date.
Mechanism (verified)
Per patch in patches/<name>/:
| file | meaning |
|---|
baseline.md | pristine upstream file at the version we patched against |
patched.md | baseline.md + our local edits |
target | relative path under each OMC root (e.g. agents/git-master.md) |
marker | unique string proving our patch is already present |
baseline-version | OMC version/git-ref the baseline was captured at (e.g. v4.14.7); used by upstream-changes.sh |
Core merge — current = NEW upstream (pristine), base = baseline.md, other = patched.md:
git merge-file -p --diff3 <new-upstream> baseline.md patched.md
# exit 0 = clean -> safe to apply
# exit 1..127 = N conflicts -> upstream touched our patched lines; DO NOT auto-apply
# exit >=128 = error
No git repo is needed (operates on three on-disk files). Roots targeted: the active
cache install (from ~/.claude/plugins/installed_plugins.json) and the
marketplace source.
한글 실행 가이드(업데이트 후 직접 실행): 업데이트-후-실행-가이드.md
Owned skills (not 3-way merged)
A patch may also bundle skills WE own under patches/<name>/skill/<skillname>/. These are
not upstream files, so they are not merged — apply.sh mirrors them verbatim into the skills
dir (${OMC_SKILLS_DIR:-$HOME/.claude/skills}/<skillname>/). This means a lost skill is
restored by the same apply.sh run that re-applies plugin patches. The bundled copy is the
canonical source; edit it there and re-run apply.sh --write to deploy. Status lines:
OK (skill up-to-date) · INSTALL (was missing) · UPDATE (differed).
Likewise, rule docs WE own go under patches/<name>/rules/<file> and are mirrored into
${OMC_RULES_DIR:-$HOME/.claude/rules}/. Same model: the bundled copy is canonical, so edit it
there (not the deployed ~/.claude/rules/ copy, which the next --write would overwrite) and
re-run. A patch folder may be asset-only — no target/baseline.md/patched.md, just
skill/ and/or rules/; the 3-way file-patch step is skipped for it and only its owned assets
deploy (e.g. the korean-writing patch ships writing-style rules and patches no plugin file).
Hook scripts WE own go under patches/<name>/hooks/<file> and mirror into
${OMC_HOOKS_DIR:-$HOME/.claude/hooks}/ the same way. When an asset needs more than a verbatim
copy — e.g. registering itself in the shared, user-owned settings.json — the patch adds a
deploy.sh that does it idempotently. apply.sh runs each patch's deploy.sh on --write
(after assets are mirrored), passing OMC_HOOKS_DIR; a re-run must be a safe no-op. The
completion-gate patch is asset-only this way: it ships the hook and a deploy.sh that
registers the Stop hook in settings.json. Note these targets (~/.claude/{hooks,rules,skills},
settings.json) are user-owned and survive OMC updates — claude-overlay deploys them so one
apply.sh --write restores your whole customization layer (handy on a new machine or after an
accidental delete), not because an update would clobber them.
How to run
./apply.sh
./apply.sh --write
./apply.sh --write --update-baseline
Status lines: OK (already patched) · CLEAN/APPLY (merged) · CONFLICT · MISSING · ERROR.
Script exit: 0 all good · 2 ≥1 conflict · 3 a merge error · 4 a patch's target is gone from every root.
MISSING means a defined patch's target file is absent on every root — the upstream
agent/file was removed or renamed, so our customization is no longer applied anywhere. The run
prints a WARNING: line and exits 4; retarget the patch to the new path or retire it. A target
absent on only some roots (e.g. the marketplace has no skill-bodies/) is normal and stays
silent — a patch is handled wherever its target exists.
Baseline only advances with --update-baseline (and only when that patch drifted).
Plain --write applies the merge to the live file but leaves baseline.md/patched.md
pinned to the original version. When a drift is applied without advancing, the run prints
a REMINDER: line naming the drifted patches — that is the cue to re-run with
--update-baseline so the next update merges against the current version (a stale baseline
invites needless conflicts over time). No drift → nothing to advance.
Resolving a CONFLICT
A conflict means upstream changed the same lines our patch edits — this needs human/agent judgment, by design.
- Open
<target>.merge-conflict (written next to the target). It has <<<<<<< upstream-new / ||||||| baseline / ======= / >>>>>>> my-patch markers.
- Decide how to combine upstream's change with our routing edit.
- Write the resolved content onto the target file.
- Re-baseline: copy the new pristine upstream to
patches/<name>/baseline.md and the resolved file to patches/<name>/patched.md, so the next update merges against the reconciled version. (See README for the exact reverse-derivation trick if you need to rebuild baseline.)
Adding a new patch
Create patches/<name>/ with target, marker, baseline.md (pristine upstream),
patched.md (pristine + your edits), and baseline-version (the OMC version/git-ref the
baseline came from, e.g. v4.14.7). For an owned skill, add skill/<skillname>/; for owned
rule docs, add rules/<file>. A folder may be asset-only (just skill/ and/or rules/, no
target) — then only those assets deploy. The scripts pick it up automatically.
Caveats
- Targets the active version + marketplace only (not stale cache versions). That is intentional — only the active version is loaded.
OMC_PATCH_ROOTS=<dir1:dir2> overrides root discovery (used for testing).- This does not survive an OMC reinstall on its own — re-run after updates. Wire to a SessionStart hook later if you want it automatic.
