refactor(plugin)!: ship as a Claude Code plugin, one dir link per harness
Skills move to skills/<name>/SKILL.md and the repo gains both manifests, so it is now a marketplace hosting exactly one plugin whose root is the repo root (source: "."). Claude Code installs it from git; no symlinks involved. Why: install.sh wired the library into every consuming repo as an ABSOLUTE symlink to $CHECKOUT_DIR. The checkout moved three times, most recently when local-dev@1966d5a dropped the embedded .skills/ copy, and nothing migrated the links — 243 dangling links across 12 repos, hidden from git by the **/.claude/skills/ ignore rule. Worse, ~/dev spans two path roots (/Users/mathias on the iCloud-shared Macs, /home/mathias on koala), so an absolute link stored there is broken on one side by construction. Re-running the installer cannot fix that; only removing the mechanism can. install.sh keeps the harnesses with no plugin system and drops from 42 links per harness to one directory link, via the convergent ~/.agents/skills convention that Pi and OpenCode both read: ~/.agents/skills -> $CHECKOUT_DIR/skills ~/.config/crush/skills -> ~/.agents/skills ~/.config/opencode/skills -> ~/.agents/skills wire_claude_repo is deleted outright rather than gated behind a flag — on a mixed-root fleet it cannot be made correct. Antigravity and Vibe targets go too; both unused. CHECKOUT_DIR keeps its host-local default deliberately: pointing it into ~/dev would put a git working tree inside iCloud with two concurrent writers. Taskfile drops five near-identical wiring loops (they had already drifted) and delegates to install.sh. `task check` gains frontmatter validation, a stray-root-entry gate, and manifest/tag version parity — the loose secret-hygiene.md sat unloadable for months because nothing checked layout. Verified: claude plugin validate . passes clean; a probe skill loaded as skills:zzprobe through --plugin-dir; task check green at 42 skills. Refs: #23 Bump-Type: minor Co-Authored-By: Claude Opus 5 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01BeAp5LTscnz2W7Ubt4eJ6m
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Claude Opus 5
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---
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name: using-git-worktrees
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description: Use when starting feature work that needs isolation from current workspace or before executing implementation plans - ensures an isolated workspace exists via native tools or git worktree fallback
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---
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# Using Git Worktrees
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## Overview
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Ensure work happens in an isolated workspace. Prefer your platform's native worktree tools. Fall back to manual git worktrees only when no native tool is available.
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**Core principle:** Detect existing isolation first. Then use native tools. Then fall back to git. Never fight the harness.
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**Announce at start:** "I'm using the using-git-worktrees skill to set up an isolated workspace."
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## Step 0: Detect Existing Isolation
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**Before creating anything, check if you are already in an isolated workspace.**
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```bash
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GIT_DIR=$(cd "$(git rev-parse --git-dir)" 2>/dev/null && pwd -P)
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GIT_COMMON=$(cd "$(git rev-parse --git-common-dir)" 2>/dev/null && pwd -P)
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BRANCH=$(git branch --show-current)
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```
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**Submodule guard:** `GIT_DIR != GIT_COMMON` is also true inside git submodules. Before concluding "already in a worktree," verify you are not in a submodule:
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```bash
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# If this returns a path, you're in a submodule, not a worktree — treat as normal repo
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git rev-parse --show-superproject-working-tree 2>/dev/null
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```
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**If `GIT_DIR != GIT_COMMON` (and not a submodule):** You are already in a linked worktree. Skip to Step 3 (Project Setup). Do NOT create another worktree.
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Report with branch state:
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- On a branch: "Already in isolated workspace at `<path>` on branch `<name>`."
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- Detached HEAD: "Already in isolated workspace at `<path>` (detached HEAD, externally managed). Branch creation needed at finish time."
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**If `GIT_DIR == GIT_COMMON` (or in a submodule):** You are in a normal repo checkout.
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Has the user already indicated their worktree preference in your instructions? If not, ask for consent before creating a worktree:
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> "Would you like me to set up an isolated worktree? It protects your current branch from changes."
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Honor any existing declared preference without asking. If the user declines consent, work in place and skip to Step 3.
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## Step 1: Create Isolated Workspace
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**You have two mechanisms. Try them in this order.**
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### 1a. Native Worktree Tools (preferred)
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The user has asked for an isolated workspace (Step 0 consent). Do you already have a way to create a worktree? It might be a tool with a name like `EnterWorktree`, `WorktreeCreate`, a `/worktree` command, or a `--worktree` flag. If you do, use it and skip to Step 3.
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Native tools handle directory placement, branch creation, and cleanup automatically. Using `git worktree add` when you have a native tool creates phantom state your harness can't see or manage.
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Only proceed to Step 1b if you have no native worktree tool available.
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### 1b. Git Worktree Fallback
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**Only use this if Step 1a does not apply** — you have no native worktree tool available. Create a worktree manually using git.
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#### Directory Selection
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Follow this priority order. Explicit user preference always beats observed filesystem state.
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1. **Check your instructions for a declared worktree directory preference.** If the user has already specified one, use it without asking.
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2. **Check for an existing project-local worktree directory:**
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```bash
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ls -d .worktrees 2>/dev/null # Preferred (hidden)
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ls -d worktrees 2>/dev/null # Alternative
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```
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If found, use it. If both exist, `.worktrees` wins.
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3. **Check for an existing global directory:**
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```bash
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project=$(basename "$(git rev-parse --show-toplevel)")
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ls -d ~/.config/superpowers/worktrees/$project 2>/dev/null
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```
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If found, use it (backward compatibility with legacy global path).
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4. **If there is no other guidance available**, default to `.worktrees/` at the project root.
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#### Safety Verification (project-local directories only)
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**MUST verify directory is ignored before creating worktree:**
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```bash
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git check-ignore -q .worktrees 2>/dev/null || git check-ignore -q worktrees 2>/dev/null
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```
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**If NOT ignored:** Add to .gitignore, commit the change, then proceed.
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**Why critical:** Prevents accidentally committing worktree contents to repository.
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Global directories (`~/.config/superpowers/worktrees/`) need no verification.
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#### Create the Worktree
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```bash
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project=$(basename "$(git rev-parse --show-toplevel)")
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# Determine path based on chosen location
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# For project-local: path="$LOCATION/$BRANCH_NAME"
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# For global: path="~/.config/superpowers/worktrees/$project/$BRANCH_NAME"
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git worktree add "$path" -b "$BRANCH_NAME"
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cd "$path"
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```
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**Sandbox fallback:** If `git worktree add` fails with a permission error (sandbox denial), tell the user the sandbox blocked worktree creation and you're working in the current directory instead. Then run setup and baseline tests in place.
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## Step 3: Project Setup
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Auto-detect and run appropriate setup:
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```bash
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# Node.js
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if [ -f package.json ]; then npm install; fi
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# Rust
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if [ -f Cargo.toml ]; then cargo build; fi
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# Python
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if [ -f requirements.txt ]; then pip install -r requirements.txt; fi
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if [ -f pyproject.toml ]; then poetry install; fi
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# Go
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if [ -f go.mod ]; then go mod download; fi
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```
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## Step 4: Verify Clean Baseline
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Run tests to ensure workspace starts clean:
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```bash
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# Use project-appropriate command
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npm test / cargo test / pytest / go test ./...
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```
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**If tests fail:** Report failures, ask whether to proceed or investigate.
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**If tests pass:** Report ready.
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### Report
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```
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Worktree ready at <full-path>
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Tests passing (<N> tests, 0 failures)
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Ready to implement <feature-name>
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```
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## Quick Reference
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| Situation | Action |
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|-----------|--------|
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| Already in linked worktree | Skip creation (Step 0) |
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| In a submodule | Treat as normal repo (Step 0 guard) |
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| Native worktree tool available | Use it (Step 1a) |
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| No native tool | Git worktree fallback (Step 1b) |
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| `.worktrees/` exists | Use it (verify ignored) |
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| `worktrees/` exists | Use it (verify ignored) |
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| Both exist | Use `.worktrees/` |
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| Neither exists | Check instruction file, then default `.worktrees/` |
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| Global path exists | Use it (backward compat) |
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| Directory not ignored | Add to .gitignore + commit |
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| Permission error on create | Sandbox fallback, work in place |
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| Tests fail during baseline | Report failures + ask |
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| No package.json/Cargo.toml | Skip dependency install |
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## Common Mistakes
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### Fighting the harness
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- **Problem:** Using `git worktree add` when the platform already provides isolation
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- **Fix:** Step 0 detects existing isolation. Step 1a defers to native tools.
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### Skipping detection
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- **Problem:** Creating a nested worktree inside an existing one
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- **Fix:** Always run Step 0 before creating anything
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### Skipping ignore verification
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- **Problem:** Worktree contents get tracked, pollute git status
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- **Fix:** Always use `git check-ignore` before creating project-local worktree
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### Assuming directory location
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- **Problem:** Creates inconsistency, violates project conventions
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- **Fix:** Follow priority: existing > global legacy > instruction file > default
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### Proceeding with failing tests
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- **Problem:** Can't distinguish new bugs from pre-existing issues
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- **Fix:** Report failures, get explicit permission to proceed
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## Red Flags
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**Never:**
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- Create a worktree when Step 0 detects existing isolation
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- Use `git worktree add` when you have a native worktree tool (e.g., `EnterWorktree`). This is the #1 mistake — if you have it, use it.
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- Skip Step 1a by jumping straight to Step 1b's git commands
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- Create worktree without verifying it's ignored (project-local)
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- Skip baseline test verification
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- Proceed with failing tests without asking
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**Always:**
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- Run Step 0 detection first
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- Prefer native tools over git fallback
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- Follow directory priority: existing > global legacy > instruction file > default
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- Verify directory is ignored for project-local
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- Auto-detect and run project setup
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- Verify clean test baseline
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