Use Diffx CLI

Use this skill to translate a diffing request into the right diffx command.

Decision Flow

1. Classify the target.

• Current repo changes only -> load references/worktree.md.
• Two refs/branches/tags/SHAs -> load references/local-and-remote-ranges.md.
• GitHub PR/commit/compare URL or github:owner/repo#123 -> load references/github-and-gitlab.md.
• GitLab MR (gitlab:owner/repo!123) -> load references/github-and-gitlab.md.

2. Choose output shape.

• Full code review output -> diff (default).
• Apply-ready output -> --mode patch.
• Summary output -> --stat, --numstat, --shortstat, --name-only, --name-status, or --summary.
• Custom table output -> --overview only.

3. Apply optional narrowing.

• File globs -> load references/filters-and-pass-through.md.
• Native git diff flags/pathspec -> load references/filters-and-pass-through.md.

4. Handle failures/conflicts.

• Unexpected empty output, invalid input, or flag conflicts -> load references/troubleshooting.md.

Defaults

• For generic "what changed?": diffx --no-pager
• For compact review: diffx <range-or-target> --stat --no-pager
• For patch handoff: diffx <range-or-target> --mode patch --no-pager

Reference Map

• references/worktree.md: current working tree and --index behavior.
• references/local-and-remote-ranges.md: branch/tag/SHA and remote shorthand ranges.
• references/github-and-gitlab.md: PR/MR/commit/compare forms.
• references/filters-and-pass-through.md: include/exclude, git flags, pathspec.
• references/troubleshooting.md: invalid combos, exit codes, quick fixes.