PuPu: Skill for Claude Code

Refactoring with GitNexus

When to Use

• "Rename this function safely"
• "Extract this into a module"
• "Split this service"
• "Move this to a new file"
• Any task involving renaming, extracting, splitting, or restructuring code

Bind the repository first

Refactoring writes to disk. rename with dry_run: false edits files in whichever repository was resolved, so binding identity here is a safety gate, not bookkeeping.

Call list_repos {} before the first tool call. With one indexed repository, use the examples below as written. With more than one, pass repo on every call: an omitted repo normally errors, but under an MCP policy with a configured default it resolves to that default silently. If you cannot tell which repository is meant, stop and ask. Never run rename with dry_run: false until the preview in the same bound repository has been reviewed — its returned file_path values show which checkout is about to be written, so read them as a confirmation of identity.

list_repos is paginated, so page with offset: pagination.nextOffset until hasMore is false before concluding a repository is absent.

detect_changes takes worktree when you are editing a linked worktree the MCP server was not launched from; otherwise git diff runs in the wrong checkout and reports nothing changed, which reads as a verified refactor.

Workflow

0. list_repos {}                                  → Bind repo (and worktree)
1. impact({target: "X", direction: "upstream"})  → Map all dependents
2. query({search_query: "X"})                            → Find execution flows involving X
3. context({name: "X"})                           → See all incoming/outgoing refs
4. Plan update order: interfaces → implementations → callers → tests

If "Index is stale" → run node .gitnexus/run.cjs analyze in terminal.

Checklists

Rename Symbol

- [ ] list_repos {} — bind repo; explicit repo when >1 indexed, ask if ambiguous
- [ ] rename({symbol_name: "oldName", new_name: "newName", dry_run: true}) — preview all edits
- [ ] Confirm the previewed file paths are in the bound repository/worktree
- [ ] Review graph edits (high confidence) and text_search edits (review carefully)
- [ ] If satisfied: rename({..., dry_run: false}) — apply edits
- [ ] detect_changes() — verify only expected files changed
- [ ] Run tests for affected processes