lcx-contribute-bug-fix

Use this skill to debug a concrete LazyCodex or Codex defect, implement the smallest correct fix in a fresh temporary workspace, and deliver it. Work in English, keep the body short, and support every claim with runtime or source evidence.

Route ownership the same way as $lcx-report-bug, but the deliverable differs by target:

code-yeongyu/lazycodex for LazyCodex, lazycodex-ai, omo-codex, bundled skills, hooks, MCP wiring, installer behavior, marketplace sync, docs, or packaging. Deliverable: a verified-fix issue with the patch embedded. NEVER open a PR or push a branch against this repo — its contents are regenerated from the source tree on every release, so PRs there cannot be merged and will be closed.
openai/codex for upstream Codex CLI bugs that reproduce without LazyCodex or come from Codex core behavior. Deliverable: a PR from a fork.

Required Outcome

For openai/codex, create a fork PR that includes:

a focused branch from a fresh ${TMPDIR:-/tmp} clone/worktree
reproduction logs from before the fix
the smallest implementation that fixes the defect
verification logs from after the fix
apply lazycodex-generated when label management is available
the required LazyCodex footer tag Tag: lazycodex-generated
cleanup of temporary worktrees and clones

For code-yeongyu/lazycodex, create an issue (never a PR) that includes:

reproduction logs from before the fix
the root cause with source evidence
the verified patch as a unified diff, produced and tested in a fresh ${TMPDIR:-/tmp} clone/worktree
verification logs from after the fix
the lazycodex-generated label and the footer tag Tag: lazycodex-generated
cleanup of temporary worktrees and clones

Required Workflow

Read the user's bug report and identify the affected surface.
Invoke $omo:debugging for the investigation. If only unqualified skill names are exposed, invoke $debugging and state that it is the OMO debugging skill.
Materialize the latest sources under LAZYCODEX_SOURCE_ROOT="${LAZYCODEX_SOURCE_ROOT:-${TMPDIR:-/tmp}/lazycodex-sources}", then decide the target repository. Sync both checkouts on every run and compare them before choosing. Validate cached checkouts before reuse so an incomplete .git directory cannot route the fix to the wrong repo:

bash

LAZYCODEX_SOURCE_ROOT="${LAZYCODEX_SOURCE_ROOT:-${TMPDIR:-/tmp}/lazycodex-sources}"
mkdir -p "$LAZYCODEX_SOURCE_ROOT"

valid_source_checkout() {
  DEST="$1"
  git -C "$DEST" rev-parse --is-inside-work-tree >/dev/null 2>&1 &&
    git -C "$DEST" config --get remote.origin.url >/dev/null 2>&1
}

recover_corrupt_source_checkout() {
  DEST="$1"
  if [ -e "$DEST" ] && ! valid_source_checkout "$DEST"; then
    QUARANTINED="$DEST.corrupt.$(date +%Y%m%d%H%M%S)"
    mv "$DEST" "$QUARANTINED"
    echo "Moved corrupt source cache $DEST to $QUARANTINED" >&2
  fi
}

sync_latest_source() {
  REPO="$1"; DEST="$2"
  recover_corrupt_source_checkout "$DEST"
  if [ ! -d "$DEST" ]; then
    gh repo clone "$REPO" "$DEST" -- --depth=1 \
      || git clone --depth=1 "https://github.com/$REPO" "$DEST"
  fi
  if ! valid_source_checkout "$DEST"; then
    echo "Source cache $DEST is not a usable git checkout after clone" >&2
    return 1
  fi
  git -C "$DEST" remote set-url origin "https://github.com/$REPO.git" >/dev/null 2>&1 || true
  DEFAULT_BRANCH="$(git -C "$DEST" remote show origin | sed -n '/HEAD branch/s/.*: //p')"
  if [ -z "$DEFAULT_BRANCH" ]; then
    DEFAULT_BRANCH="$(git -C "$DEST" symbolic-ref --short refs/remotes/origin/HEAD 2>/dev/null | sed 's#^origin/##')"
  fi
  if [ -z "$DEFAULT_BRANCH" ]; then
    echo "Could not determine default branch for $REPO in $DEST" >&2
    return 1
  fi
  git -C "$DEST" fetch --depth=1 origin "$DEFAULT_BRANCH"
  git -C "$DEST" checkout -B "$DEFAULT_BRANCH" FETCH_HEAD
}
sync_latest_source code-yeongyu/lazycodex "$LAZYCODEX_SOURCE_ROOT/lazycodex-source"
sync_latest_source openai/codex "$LAZYCODEX_SOURCE_ROOT/openai-codex-source"

Create a fresh temporary clone and branch under ${TMPDIR:-/tmp}. Do not modify the user's current repository for the target fix unless the current repository is itself the requested target and the user explicitly asked for local edits.

bash

TARGET_REPO="code-yeongyu/lazycodex" # or openai/codex
WORK_ROOT="$(mktemp -d "${TMPDIR:-/tmp}/lazycodex-fix-XXXXXX")"
gh repo clone "$TARGET_REPO" "$WORK_ROOT/repo" -- --depth=1
cd "$WORK_ROOT/repo"
BASE_BRANCH="$(git remote show origin | sed -n '/HEAD branch/s/.*: //p')"
git fetch origin "$BASE_BRANCH" --depth=1
BRANCH_NAME="lazycodex/bug-fix-<short-slug>"
git worktree add "$WORK_ROOT/worktree" -b "$BRANCH_NAME" "origin/$BASE_BRANCH"
cd "$WORK_ROOT/worktree"

If gh cannot clone, use git clone --depth=1 "https://github.com/$TARGET_REPO" "$WORK_ROOT/repo" and continue with the same worktree flow.

Reproduce the bug in the worktree through the real surface. Save exact command output to ${TMPDIR:-/tmp}/lazycodex-fix-<short-slug>-repro.log.
Write or update a failing regression test before production changes. Confirm it fails for the bug, not for a missing fixture or typo.
Implement the smallest correct fix. Avoid refactors unless the fix cannot be made safely without one.
Run the regression test, adjacent tests, and the smallest real-surface QA command that proves the user-visible behavior changed.
Commit the verified fix in the worktree. Inspect the status first so the delivered diff cannot be empty or stale:

bash

git status --short
git add -A
git commit -m "fix: <short bug-fix summary>"
git log --oneline "origin/$BASE_BRANCH..HEAD"

Build the delivery body for the target:

openai/codex: generate the PR body with scripts/create-pr-body.mjs.
code-yeongyu/lazycodex: export the verified patch and write the issue body from the Verified-Fix Issue Template below:

bash

PATCH_FILE="${TMPDIR:-/tmp}/lazycodex-fix-<short-slug>.patch"
git diff "origin/$BASE_BRANCH"..HEAD > "$PATCH_FILE"

Ensure the generated label exists when the target repo allows label management. Keep the footer tag even when label creation is unavailable:

bash

LABEL_ARGS=()
if gh label create lazycodex-generated --repo "$TARGET_REPO" --color "7C3AED" --description "Created by LazyCodex" --force; then
  LABEL_ARGS=(--label lazycodex-generated)
else
  echo "Label management unavailable for $TARGET_REPO; keeping the footer tag only."
fi

Deliver the fix.

code-yeongyu/lazycodex: create the verified-fix issue. Never push a branch to this repo and never run gh pr create against it:

bash

ISSUE_BODY="${TMPDIR:-/tmp}/lazycodex-fix-<short-slug>-issue.md"
gh issue create --repo code-yeongyu/lazycodex --title "<short fix title>" "${LABEL_ARGS[@]}" --body-file "$ISSUE_BODY"

openai/codex: fork, push the branch to the fork, and create the PR:

bash

gh repo fork openai/codex --remote --remote-name fork
GH_USER="$(gh api user --jq .login)"
git push -u fork "$BRANCH_NAME"
gh pr create --repo openai/codex --base "$BASE_BRANCH" --head "$GH_USER:$BRANCH_NAME" --title "<short fix title>" "${LABEL_ARGS[@]}" --body-file "$PR_BODY"

Clean up:

bash

cd /
git -C "$WORK_ROOT/repo" worktree remove "$WORK_ROOT/worktree"
find "$WORK_ROOT" -mindepth 1 -maxdepth 1 -exec rm -r -- {} +
rmdir "$WORK_ROOT"

Return the PR or issue URL, the reproduction command, the verification command, and the cleanup receipt.

Verified-Fix Issue Template (code-yeongyu/lazycodex)

Write the issue body in English. Embed the patch verbatim so a maintainer can apply it to the source tree:

markdown

## Problem Situation
[What failed for the user.]

## Reproduction Logs
[Exact failing command and relevant log excerpt.]

## Root Cause
[Confirmed cause with runtime and source evidence.]

## Verified Fix
[What changed and why this is the smallest correct fix.]

```diff
[Contents of $PATCH_FILE.]
```

## Verification
- [RED test output or repro before the fix]
- [GREEN test output after the fix]
- [Manual QA command and result]

---
This fix was debugged, implemented, and verified with [LazyCodex](https://github.com/code-yeongyu/lazycodex).
Tag: lazycodex-generated

PR Body Generator (openai/codex)

Use the bundled script to generate the PR body. Create a JSON file with this shape:

json

{
  "title": "Fix short user-visible failure",
  "targetRepository": "openai/codex",
  "problem": "What is broken for the user.",
  "reproductionLogs": "Exact failing command, log excerpt, or trace.",
  "approach": "What changed and why this is the smallest correct fix.",
  "confidence": "Why the diagnosis and fix are strongly supported.",
  "risks": "Risk level and what could regress.",
  "userVisibleBehaviorChanges": "What changes for the user after the PR.",
  "verification": ["failing test before fix", "passing test after fix", "manual QA command"]
}

Run:

bash

PR_INPUT="${TMPDIR:-/tmp}/lazycodex-fix-<short-slug>-pr.json"
PR_BODY="${TMPDIR:-/tmp}/lazycodex-fix-<short-slug>-pr.md"
node "<skill-root>/scripts/create-pr-body.mjs" "$PR_INPUT" "$PR_BODY"

PR Body Template (openai/codex)

The generated body must follow this structure:

markdown

## Problem Situation
[What failed for the user.]

## Reproduction Logs
[Exact failing command and relevant log excerpt.]

## Approach
[What changed and why.]

## Why I Am Confident
[Evidence that proves the root cause and fix.]

## Risks
[Risk level and possible regressions.]

## User-Visible Behavior Changes
[What users experience after this PR.]

## Verification
- [RED test output or repro before the fix]
- [GREEN test output after the fix]
- [Manual QA command and result]

---
This PR was debugged, implemented, and created with [LazyCodex](https://github.com/code-yeongyu/lazycodex).
Tag: lazycodex-generated

Stop Conditions

Stop and ask one narrow question only when:

the bug cannot be reproduced from available information
target repository ownership remains ambiguous after comparing LazyCodex and upstream Codex evidence
authentication is missing for creating the issue or pushing and creating the PR
the fix requires a product decision rather than a technical correction

Do not open:

a PR or pushed branch targeting code-yeongyu/lazycodex — deliver the verified-fix issue instead, always
a PR or verified-fix issue without a failing-before and passing-after test
a PR or verified-fix issue without a real-surface QA command
a PR or issue without the Tag: lazycodex-generated footer
a verified-fix issue without the patch embedded in a diff block
a vague fix that does not identify the root cause
a broad refactor disguised as a bug fix