update

Self-update plan-tango from the GitHub release channel. Resolves the marketplace clone directory, version-checks against the latest release tag, confirms with the user, runs `git fetch + git reset --hard v` in the clone, and prints a reload reminder. Mirrors the `/plugin → Marketplaces → plan-tango → Update` UI as a single command.

<execution_context>

• Update checker: ${CLAUDE_PLUGIN_ROOT}/skills/tango/scripts/update-check.mjs — handles the 7-day on-disk cache (~/.claude/plan-tango/.update-cache.json), git ls-remote --tags query, semver comparison, silent-on-network-failure behaviour. Reused as-is; this skill only adds the git pull step on top.
• Plugin version source: ${CLAUDE_PLUGIN_ROOT}/.claude-plugin/plugin.json — read .version to pass as --current-version.
• Marketplace clone: the parent-parent of ${CLAUDE_PLUGIN_ROOT}. The marketplace.json source field is ./plugins/plan-tango, so the plugin lives at <MARKETPLACE_ROOT>/plugins/plan-tango/. Two cd .. from CLAUDE_PLUGIN_ROOT reaches the git repo root.
• User opt-out: update_check: false in ~/.claude/plan-tango/config.json blocks the SessionStart hook and Phase E notice but does NOT block this skill — running /plan-tango:update is an explicit user intent, so we always honour it. </execution_context>

Step 1 — Resolve marketplace root + sanity check

MARKETPLACE_DIR="$(cd "${CLAUDE_PLUGIN_ROOT}/../.." && pwd)"
test -d "$MARKETPLACE_DIR/.git" && echo "$MARKETPLACE_DIR" || echo "NOT_GIT"

If output is NOT_GIT → ABORT with:

Cannot self-update: <MARKETPLACE_DIR> is not a git repository. plan-tango
was likely installed via direct git clone or symlink, not through Claude
Code's marketplace. Pull/build the new version manually from
https://github.com/egsok/plan-tango.

Step 2 — Parse flags from $ARGUMENTS

• --check — print version status and STOP (no git pull, no AskUserQuestion).
• --force — skip the clean-working-tree safety check in Step 4. Equivalent to "I know I have local mods, discard them".
• No flag — run the full check + confirm + pull flow.

Step 3 — Version check

Read current version:

CURRENT=$(node -e "console.log(JSON.parse(require('fs').readFileSync(process.env.CLAUDE_PLUGIN_ROOT + '/.claude-plugin/plugin.json','utf8')).version)")

Run update-check:

node "${CLAUDE_PLUGIN_ROOT}/skills/tango/scripts/update-check.mjs" --current-version "$CURRENT"

Parse the JSON response from stdout. Branch on status:

• "ok" → print ✓ Already up to date (v<CURRENT>). → STOP (exit cleanly).
• "newer-available" → bind LATEST = parsed.latest. Print plan-tango v<LATEST> is available (you're on v<CURRENT>). Continue.
• "skipped" → print Network check failed (no cache; git unavailable or timeout). Try again later, or update manually via /plugin → Marketplaces → plan-tango → Update. → STOP.
• "error" → print Update check error: <parsed.message> → STOP.

If --check flag was passed: STOP here regardless of status. No git operations.

Step 4 — Safety check: clean working tree

cd "$MARKETPLACE_DIR" && git status --porcelain

If stdout is non-empty:

• Without --force: ABORT with:

  Marketplace clone has local modifications at <MARKETPLACE_DIR>:
  <list first 10 modified files from git status --porcelain>
  
  Resolve them manually before updating, or pass --force to discard
  them.
  

• With --force: print one-line warning ⚠ Discarding local modifications: <count> file(s). and continue.

Step 5 — Confirm with user

Use AskUserQuestion (single question, two options):

• Question: Update plan-tango from v<CURRENT> to v<LATEST>?
• Header: Update?
• Options:
  • Label Yes, update now, description Pull v<LATEST> from GitHub and overwrite the local plugin install.
  • Label Cancel, description Leave the current version in place.

If user picks Cancel → print Update cancelled. → STOP.

Step 6 — Pull the tag

cd "$MARKETPLACE_DIR" && git fetch origin --tags && git reset --hard "v$LATEST"

If git fetch fails (network) → ABORT with Fetch failed; aborting. Try again or update manually via /plugin UI. Tree is untouched.

If git reset --hard "v$LATEST" fails (tag doesn't exist — race with a tag deletion) → ABORT with Tag v<LATEST> not found on remote. Aborting. The update-check cache may be stale; try /plan-tango:update again in a few minutes.

On success — capture the new commit:

NEW_COMMIT=$(git rev-parse --short HEAD)

Step 7 — Reload reminder

Print exactly:

✓ plan-tango updated to v<LATEST> (commit <NEW_COMMIT>).

To activate the new version in your current Claude Code session:
- Terminal:  /reload-plugins
- VS Code:   Developer: Reload Window  (or restart Claude Code)

After reload, run /plan-tango:tango normally — the new skill code, scripts,
and agents will be picked up.

<critical_invariants>

• Never edit anything outside $MARKETPLACE_DIR. This skill only touches the marketplace clone; user's ~/.claude/plan-tango/config.json, plans under ~/.claude/plans/, and any other path stay untouched.
• Confirmation gate is mandatory for the non---check flow. No auto-pull without user picking Yes, update now.
• Tag-pinned reset, never origin/main. Lands users on a stable release; never on whatever's currently on the development branch.
• Network failures are non-fatal at every step — the only way the live install changes is the explicit git reset --hard in Step 6. </critical_invariants>