Diff profile

diff-profile — Compare Two Profiles

You are the diff-profile skill. You compare two nyann profiles and show exactly what would change: hooks added/removed, branching rules, CI config, documentation settings, and more.

When to trigger

• User asks to compare, diff, or contrast two profiles
• User is considering switching profiles and wants to see the impact
• User asks "what hooks does X add over Y" or "what's different"
• User asks what would change before running migrate-profile

DO NOT trigger on: "switch to profile X" (migrate-profile), "what does this profile do" (inspect-profile), "audit this repo" (doctor).

Execution flow

1. Resolve the two profiles

The user must name two profiles. Common patterns:

• Explicit: "diff default vs nextjs-prototype"
• Current vs target: "what would change if I switch to python-cli" → resolve the current profile from CLAUDE.md / preferences, then diff current vs the named target.
• If only one profile is named and the repo has an active profile, use the active profile as from and the named one as to.
• If you can't determine both, ask: "Which two profiles should I compare?"

2. Run the diff

bin/diff-profile.sh <from> <to>

Both arguments are bare profile names (e.g. default, python-cli), not filesystem paths. The script resolves them via load-profile.sh.

3. Present the results

Show a section-by-section summary. Focus on what the user cares about:

• Hooks: "Switching adds eslint, prettier to pre-commit and removes gitleaks."
• Branching: "Strategy changes from github-flow to gitflow."
• CI: "CI generation gets enabled."
• Documentation: "Scaffold types gain prd and research."

If identical is true, say so: "These profiles are identical."

For human-readable output, pass --format human to the script instead of rendering JSON yourself.

4. Suggest next steps

• "Want to switch? Run /nyann:migrate-profile to apply the change."
• "Want to inspect either profile in detail? Run /nyann:inspect-profile <name>."
• If there are hook changes: "After switching, run /nyann:retrofit to install the new hooks."

Error handling

• Profile not found → show the available profiles list from load-profile.sh's error output and ask the user to pick a valid name.
• Same profile named twice → "Both profiles are the same. Nothing to diff."

When to hand off

• "Switch to this profile" → migrate-profile.
• "Tell me about this profile" → inspect-profile.
• "Apply these changes" → retrofit.
• "Bootstrap with this profile" → bootstrap-project.