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Drift detection + apply for a scaffolded harness. Re-renders the template with the same vars, computes added/removed/changed file plan, and applies with Git-style conflict markers or .rej files. Default is dry-run.
Passed 20 of 21 test cases with the skill, and 15 of 21 without it.
and 2 more in the full report
5 fixed16 passed either way1 still failing0 broke
Tokens, turns and time describe resource use, not a dollar price.
One of 4 test cases the skill fixed. Same model, same prompt, with and without the skill.
I want to perform a dry-run drift check on the scaffolded project located in the current working directory. What exact slash command should I execute?
| Checked | Without skill | With skill |
|---|---|---|
| Invokes `/upgrade-harness` with no parameters. | Missed | Passed |
The instructions your model reads when the skill loads.
Codex skill: drift detection + apply for a scaffolded harness.
Re-renders the template that produced the harness against the current generator version, using the same vars the original scaffold used. Computes a 3-bucket plan:
| Bucket | Meaning |
|---|---|
| added | upstream template now has files the harness doesn't |
| removed | upstream template no longer has files the harness does |
| changed | upstream and harness differ; sub-classified clean vs conflict |
A clean change means the harness's version equals the original generation — apply safely. A conflict means the user edited the file post-scaffold; the apply step writes either Git-style inline markers or a .rej sidecar for manual merge.
/upgrade-harness # dry-run on cwd
/upgrade-harness path=./my-harness
/upgrade-harness path=./my-harness apply=true
/upgrade-harness path=./my-harness apply=true conflict=rej
harness upgrade ./my-harness # dry-run
harness upgrade ./my-harness --apply # apply, inline conflicts
harness upgrade ./my-harness --apply --conflict=rej # apply, .rej sidecars
scaffold (create-agent-harness)
↓
edit (you)
↓
test cases passed, vs 15 / 21 without
More skills from the same source and nearby in the registry, with their headline benchmark lift.