gstack/gstack-upgrade/SKILL.md

---
name: gstack-upgrade
version: 1.1.0
description: Upgrade gstack to the latest version.
triggers:
  - upgrade gstack
  - update gstack version
  - get latest gstack
allowed-tools:
  - Bash
  - Read
  - Write
  - AskUserQuestion
---
<!-- AUTO-GENERATED from SKILL.md.tmpl — do not edit directly -->
<!-- Regenerate: bun run gen:skill-docs -->

# /gstack-upgrade

Upgrade gstack to the latest version and show what's new.

## Inline upgrade flow

This section is referenced by all skill preambles when they detect `UPGRADE_AVAILABLE`.

### Step 1: Ask the user (or auto-upgrade)

First, check if auto-upgrade is enabled:
```bash
_AUTO=""
[ "${GSTACK_AUTO_UPGRADE:-}" = "1" ] && _AUTO="true"
[ -z "$_AUTO" ] && _AUTO=$(~/.claude/skills/gstack/bin/gstack-config get auto_upgrade 2>/dev/null || true)
echo "AUTO_UPGRADE=$_AUTO"
```

**If `AUTO_UPGRADE=true` or `AUTO_UPGRADE=1`:** Skip AskUserQuestion. Log "Auto-upgrading gstack v{old} → v{new}..." and proceed directly to Step 2. On setup failure, follow Step 4's install-specific recovery: vendored installs restore their backup; git installs stop with the pre-upgrade commit recorded, without a destructive reset. Never claim restoration unless it actually succeeded.

**Otherwise**, use AskUserQuestion:
- Question: "gstack **v{new}** is available (you're on v{old}). Upgrade now?"
  Four fields (`UPGRADE_AVAILABLE <old> <old>+<n> <sha>`, main moved): ask "gstack main is **{n} commit(s)** past v{old} (at {sha}). Upgrade now?"
- Options: ["Yes, upgrade now", "Always keep me up to date", "Not now", "Never ask again"]

**If "Yes, upgrade now":** Proceed to Step 2.

**If "Always keep me up to date":**
```bash
~/.claude/skills/gstack/bin/gstack-config set auto_upgrade true
```
Tell user: "Auto-upgrade enabled. Future updates will install automatically." Then proceed to Step 2.

**If "Not now":** Write snooze state with escalating backoff (first snooze = 24h, second = 48h, third+ = 1 week), then continue with the current skill. Do not mention the upgrade again.
```bash
GSTACK_STATE_ROOT=$(~/.claude/skills/gstack/bin/gstack-paths --get GSTACK_STATE_ROOT); : "${GSTACK_STATE_ROOT:?gstack-paths failed; reinstall with ./setup or /gstack-upgrade}"
_SNOOZE_FILE="$GSTACK_STATE_ROOT/update-snoozed"
_REMOTE_VER="{new}"
_CUR_LEVEL=0
if [ -f "$_SNOOZE_FILE" ]; then
  _SNOOZED_VER=$(awk '{print $(1)}' "$_SNOOZE_FILE")
  if [ "$_SNOOZED_VER" = "$_REMOTE_VER" ]; then
    _CUR_LEVEL=$(awk '{print $(2)}' "$_SNOOZE_FILE")
    case "$_CUR_LEVEL" in *[!0-9]*) _CUR_LEVEL=0 ;; esac
  fi
fi
_NEW_LEVEL=$((_CUR_LEVEL + 1))
[ "$_NEW_LEVEL" -gt 3 ] && _NEW_LEVEL=3
echo "$_REMOTE_VER $_NEW_LEVEL $(date +%s)" > "$_SNOOZE_FILE"
```
Note: `{new}` is the remote version from the `UPGRADE_AVAILABLE` output — substitute it from the update check result. On a four-field line use the SHA (fourth field) as `{new}`, so the snooze ends when main moves.

Tell user the snooze duration: "Next reminder in 24h" (or 48h or 1 week, depending on level). Tip: "Set `auto_upgrade: true` in `~/.gstack/config.yaml` for automatic upgrades."

**If "Never ask again":**
```bash
~/.claude/skills/gstack/bin/gstack-config set update_check false
```
Tell user: "Update checks disabled. Run `~/.claude/skills/gstack/bin/gstack-config set update_check true` to re-enable."
Continue with the current skill.

### Step 2: Detect install type

```bash
if [ -d "$HOME/.claude/skills/gstack/.git" ]; then
  INSTALL_TYPE="global-git"
  INSTALL_DIR="$HOME/.claude/skills/gstack"
elif [ -d "$HOME/.gstack/repos/gstack/.git" ]; then
  INSTALL_TYPE="global-git"
  INSTALL_DIR="$HOME/.gstack/repos/gstack"
elif [ -d ".claude/skills/gstack/.git" ]; then
  INSTALL_TYPE="local-git"
  INSTALL_DIR=".claude/skills/gstack"
elif [ -d ".agents/skills/gstack/.git" ]; then
  INSTALL_TYPE="local-git"
  INSTALL_DIR=".agents/skills/gstack"
elif [ -d ".claude/skills/gstack" ]; then
  INSTALL_TYPE="vendored"
  INSTALL_DIR=".claude/skills/gstack"
elif [ -d "$HOME/.claude/skills/gstack" ]; then
  INSTALL_TYPE="vendored-global"
  INSTALL_DIR="$HOME/.claude/skills/gstack"
elif _SRC=$(~/.claude/skills/gstack/bin/gstack-paths --get GSTACK_STATE_ROOT 2>/dev/null) && _SRC=$(awk -F '\t' '$(1) == "claude" && $(6) != "-" { print $(6); exit }' "$_SRC/installs.tsv" 2>/dev/null) && [ -d "$_SRC/.git" ]; then
  # The install registry names the checkout setup activated for this host (e.g. a ~/gstack clone).
  INSTALL_TYPE="global-git"
  INSTALL_DIR="$_SRC"
else
  echo "ERROR: gstack not found"
  exit 1
fi
INSTALL_DIR=$(cd -- "$INSTALL_DIR" && pwd -P) || { echo "ERROR: cannot enter the gstack install directory" >&2; exit 1; }
echo "Install type: $INSTALL_TYPE at $INSTALL_DIR"
```

The install type and the absolute directory printed above are used in all subsequent steps.
Carry `INSTALL_TYPE`, `INSTALL_DIR`, `OLD_VERSION`, and later `UPSTREAM_REF` and `NEW_VERSION` forward explicitly: tool calls may run in fresh shells, so start each later block by assigning them from the captured output (for example `INSTALL_DIR=/abs/path/printed/above`). Do not rely on a prior call's working directory or shell variables. Every block that changes files first checks `INSTALL_DIR` and stops before any git command when it is unset, empty, missing, unreadable, or not gstack's own checkout.

### Step 3: Save old version

Use the install directory from Step 2's output below:

```bash
OLD_VERSION=$(cat "${INSTALL_DIR:?INSTALL_DIR is not set: re-run Step 2 and substitute the printed path}/VERSION" 2>/dev/null || echo "unknown")
echo "OLD_VERSION=$OLD_VERSION"
```

### Step 4: Upgrade

Use the install type and directory detected in Step 2:

**For git installs** (global-git, local-git):

Fast-forward first, through `bin/gstack-ff-update`, the same code the
session-update auto-upgrade uses: local edits that merge cleanly ride over the
update, and an edit that conflicts (or a staged change, or an unmerged file)
is saved in a rescue ref instead of being left as conflict markers:
```bash
cd -- "${INSTALL_DIR:?INSTALL_DIR is not set: re-run Step 2 and substitute the printed path}" || exit 1
{ [ -f VERSION ] && [ -f setup ] && [ -f bin/gstack-config ] && _p=$(git rev-parse --show-prefix 2>/dev/null) && [ -z "$_p" ] && [ "$(git rev-parse --is-inside-work-tree 2>/dev/null)" = true ]; } || { echo "ERROR: $INSTALL_DIR is not a gstack checkout; nothing was changed. Re-run Step 2." >&2; exit 1; }
git fetch origin
# Channel ref (docs/releases.md): origin/stable for a team install, else origin/main
_CH=$(bash bin/gstack-update-channel.sh --fetch-ref 2>&1) || _CH=origin/main
echo "$_CH"; UPSTREAM_REF=$(printf '%s\n' "$_CH" | tail -1)
echo "UPSTREAM_REF=${UPSTREAM_REF:=origin/main}"
# Same pre-advance check as the auto-updater: the incoming release's Bun floor,
# judged by bash whatever this tool shell is (zsh does not word-split).
HOLD=$(UPSTREAM_REF="$UPSTREAM_REF" bash -c '. bin/gstack-bun-version.sh && gstack_bun_incoming_hold . "$UPSTREAM_REF"' 2>/dev/null) && { case "$HOLD" in bun-version-unreadable*) echo "BUN_VERSION_UNREADABLE: $HOLD; nothing was changed" >&2 ;; *) echo "BUN_TOO_OLD: $HOLD; nothing was changed" >&2 ;; esac; exit 1; }
PRE_UPGRADE_COMMIT=$(git rev-parse HEAD)
echo "PRE_UPGRADE_COMMIT=$PRE_UPGRADE_COMMIT"
# Past the release (by ancestry, or by VERSION in a depth-1 clone): wait for stable; nothing moves back.
if [ "$UPSTREAM_REF" = origin/stable ] && [ "$(git rev-parse origin/stable)" != "$PRE_UPGRADE_COMMIT" ] && ! git merge-base --is-ancestor HEAD origin/stable 2>/dev/null \
  && { git merge-base --is-ancestor origin/stable HEAD 2>/dev/null || [ "$(printf '%s\n%s\n' "$(git show origin/stable:VERSION)" "$(cat VERSION)" | sort -V | tail -1)" = "$(cat VERSION)" ]; }; then echo "AHEAD_OF_STABLE"; exit 0; fi
FF=$(bash bin/gstack-ff-update . "$UPSTREAM_REF"); FF_RC=$?
echo "$FF"
case "$FF_RC" in
  0) if ./setup --refresh-registered; then echo "FF_OK"; else echo "SETUP_FAILED: git update succeeded; stop and inspect setup output (previous commit: $PRE_UPGRADE_COMMIT)" >&2; exit 1; fi ;;
  4) echo "FF_REFUSED" ;;
  *) echo "FF_STOPPED: $FF" >&2; exit 1 ;;
esac
```

Setup's `--refresh-registered` refreshes every install this checkout
registered (each host, global and this project's), prints the source first,
and ends with an `Upgrade summary` of one row per install. Relay those rows
as printed. A `failed` row means that host kept its previous install; give
its retry command and never say every host was refreshed. A `skipped` row
belongs to another checkout or project; pass on its command, do not run it.

If the output ends with `FF_OK`, the upgrade is done — skip the fallback
below entirely. When the line before it reads
`rescued <old> <new> refs/gstack/rescue/<oid> unmerged=<0|1>`, tell the user
their conflicting local edits were saved there and relay the `Inspect`,
`Export` and `Delete` commands the script printed (export into a scratch
checkout with `git apply -3`, never `stash apply` in the install;
`unmerged=1` means the rescue needs manual resolution).
On `FF_STOPPED`, STOP and relay the reason: nothing was changed.
On `AHEAD_OF_STABLE`, STOP: the checkout is already past the latest stable release, so nothing changes until the next cut (`gstack-config set update_channel main` follows every merge). On a `fetching origin/stable failed` line above, STOP and relay it; nothing was changed.
`ff-busy` means another gstack update is running (retry in a minute);
`autostash-unrecoverable` names what is in the way (an untracked file the
release adds, or another git command); `index-unreadable` means the checkout's
index is damaged.
On `BUN_TOO_OLD`, STOP: tell the user to run `bun upgrade`, then /gstack-upgrade again.
On `BUN_VERSION_UNREADABLE`, STOP: `bun --version` did not print a version gstack can read, so `bun upgrade` may not run either; tell the user to reinstall Bun from https://bun.sh (`curl -fsSL https://bun.sh/install | bash` in Git Bash or a macOS/Linux terminal), check that `bun --version` prints a version such as 1.4.2, then run /gstack-upgrade again (docs/troubleshooting.md#bun-version-unreadable).
On `SETUP_FAILED`, STOP; keep user changes and report the recovery commit. There is no `.bak` on the git path. Do not enter the divergence fallback merely because setup failed. Enter it only on `FF_REFUSED` (local commits or a diverged history); network/auth failures stop for repair, not reset.

**Fallback (ff-only refused — local commits or divergence).** `git reset
--hard` DESTROYS things: a clean tree with unpushed local commits still loses
those commits. Gate it:

1. Run `git status --porcelain` and `git rev-list "${UPSTREAM_REF:?}"..HEAD --oneline`
   in `$INSTALL_DIR`.
2. If BOTH are empty, the reset is provably safe — run the fallback block
   below without asking.
3. Otherwise ask via AskUserQuestion (one-way door — destructive), listing
   exactly what will be discarded: each dirty file and each unpushed commit
   by hash + subject. Options: **A)** Discard them and upgrade (reset) —
   requires the explicit letter; **B)** Abort the upgrade so the user can
   rescue their work first (recommended when local commits exist). Never
   proceed on a vague reply.

```bash
cd -- "${INSTALL_DIR:?INSTALL_DIR is not set: re-run Step 2 and substitute the printed path}" || exit 1
{ [ -f VERSION ] && [ -f setup ] && [ -f bin/gstack-config ] && _p=$(git rev-parse --show-prefix 2>/dev/null) && [ -z "$_p" ] && [ "$(git rev-parse --is-inside-work-tree 2>/dev/null)" = true ]; } || { echo "ERROR: $INSTALL_DIR is not a gstack checkout; nothing was changed. Re-run Step 2." >&2; exit 1; }
# Regenerable render-footprint dirt (setup re-renders it) never goes into the stash.
git checkout -- 'SKILL.md' '*/SKILL.md' '*/sections/*.md' 2>/dev/null || true
STASH_OUTPUT=$(git stash 2>&1)
git reset --hard "${UPSTREAM_REF:?UPSTREAM_REF is not set: substitute the value Step 4 printed}"
./setup --refresh-registered
```
If `$STASH_OUTPUT` contains "Saved working directory", warn the user: "Note: local changes were stashed (any modified generated SKILL.md/sections files were discarded first — they regenerate on setup). Run `git stash pop` in the skill directory to restore your own changes."

**For vendored installs** (vendored, vendored-global):
```bash
(cd -- "${INSTALL_DIR:?INSTALL_DIR is not set: re-run Step 2 and substitute the printed path}" && [ -f VERSION ] && [ -f setup ] && [ -f bin/gstack-config ]) || { echo "ERROR: INSTALL_DIR=${INSTALL_DIR:-} is not a gstack install; nothing was changed. Re-run Step 2." >&2; exit 1; }
# A stale .bak from a previously crashed upgrade would make the mv below NEST
# the live install inside it and the failure-restore arm would "restore" the
# stale backup. It may also be the only good copy from that crashed run —
# abort and let the human inspect, never delete it silently.
[ -e "$INSTALL_DIR.bak" ] && { echo "ERROR: stale backup exists at $INSTALL_DIR.bak (from a previous failed upgrade?) — inspect it, salvage/remove it, then re-run." >&2; exit 1; }
TMP_DIR=$(mktemp -d "${TMPDIR:-/tmp}/gstack-upgrade.XXXXXX") || { echo "ERROR: mktemp failed — aborting upgrade (install untouched)." >&2; exit 1; }
git clone --depth 1 https://github.com/garrytan/gstack.git "$TMP_DIR/gstack" || { echo "ERROR: clone failed — aborting upgrade (install untouched)." >&2; rm -rf "$TMP_DIR"; exit 1; }
mv "$INSTALL_DIR" "$INSTALL_DIR.bak" || { rm -rf "$TMP_DIR"; exit 1; }
if mv "$TMP_DIR/gstack" "$INSTALL_DIR"; then
  if (cd "$INSTALL_DIR" && ./setup --refresh-registered); then
    rm -rf "$INSTALL_DIR.bak" "$TMP_DIR"
  else
    rm -rf "$INSTALL_DIR"
    mv "$INSTALL_DIR.bak" "$INSTALL_DIR" || { echo "ERROR: restore failed; backup retained." >&2; exit 1; }
    rm -rf "$TMP_DIR"
    echo "ERROR: setup failed; previous install restored." >&2
    exit 1
  fi
else
  mv "$INSTALL_DIR.bak" "$INSTALL_DIR"
  echo "ERROR: swap failed — previous install restored; upgrade aborted." >&2
  rm -rf "$TMP_DIR"
  exit 1
fi
```

### Step 4.5: Handle local vendored copy

Use the install directory from Step 2. Check if there's also a local vendored copy, and whether team mode is active:

```bash
_RESOLVED_PRIMARY=$(cd -- "${INSTALL_DIR:?INSTALL_DIR is not set: re-run Step 2 and substitute the printed path}" && pwd -P) || exit 1
_ROOT=$(git rev-parse --show-toplevel 2>/dev/null)
LOCAL_GSTACK=""
if [ -n "$_ROOT" ] && [ -d "$_ROOT/.claude/skills/gstack" ]; then
  _RESOLVED_LOCAL=$(cd "$_ROOT/.claude/skills/gstack" && pwd -P)
  if [ "$_RESOLVED_LOCAL" != "$_RESOLVED_PRIMARY" ]; then
    LOCAL_GSTACK="$_ROOT/.claude/skills/gstack"
  fi
fi
_TEAM_MODE=$(~/.claude/skills/gstack/bin/gstack-config get team_mode 2>/dev/null || echo "false")
echo "LOCAL_GSTACK=$LOCAL_GSTACK"
echo "TEAM_MODE=$_TEAM_MODE"
```

**If `LOCAL_GSTACK` is non-empty AND `TEAM_MODE` is `true`:** Remove the vendored copy. Team mode uses the global install as the single source of truth.

```bash
(cd -- "${LOCAL_GSTACK:?LOCAL_GSTACK is not set: re-run the detection block above and substitute the printed path}" && [ -f VERSION ] && [ -f setup ] && [ -f bin/gstack-config ]) || { echo "ERROR: LOCAL_GSTACK=${LOCAL_GSTACK:-} is not a gstack copy; nothing was changed." >&2; exit 1; }
_ROOT=${LOCAL_GSTACK%/.claude/skills/gstack}
{ [ "$_ROOT" != "$LOCAL_GSTACK" ] && cd -- "${_ROOT:?}" && _p=$(git rev-parse --show-prefix 2>/dev/null) && [ -z "$_p" ] && [ "$(git rev-parse --is-inside-work-tree 2>/dev/null)" = true ]; } || { echo "ERROR: $LOCAL_GSTACK is not the vendored copy at the root of a git repository; nothing was changed." >&2; exit 1; }
git rm -r --cached .claude/skills/gstack/ 2>/dev/null || true
if ! grep -qF '.claude/skills/gstack/' .gitignore 2>/dev/null; then
  echo '.claude/skills/gstack/' >> .gitignore
fi
rm -rf "$LOCAL_GSTACK"
```
Tell user: "Removed vendored copy at `$LOCAL_GSTACK` (team mode active — global install is the source of truth). Commit the `.gitignore` change when ready."

**If `LOCAL_GSTACK` is non-empty AND `TEAM_MODE` is NOT `true`:** Update it by copying from the freshly-upgraded primary install (same approach as README vendored install):
```bash
(cd -- "${INSTALL_DIR:?INSTALL_DIR is not set: re-run Step 2 and substitute the printed path}" && [ -f VERSION ] && [ -f setup ] && [ -f bin/gstack-config ]) || { echo "ERROR: INSTALL_DIR=${INSTALL_DIR:-} is not a gstack install; nothing was changed." >&2; exit 1; }
(cd -- "${LOCAL_GSTACK:?LOCAL_GSTACK is not set: re-run the detection block above and substitute the printed path}" && [ -f VERSION ] && [ -f setup ] && [ -f bin/gstack-config ]) || { echo "ERROR: LOCAL_GSTACK=${LOCAL_GSTACK:-} is not a gstack copy; nothing was changed." >&2; exit 1; }
[ -e "$LOCAL_GSTACK.bak" ] && { echo "ERROR: stale vendored backup; inspect it before retrying." >&2; exit 1; }
mv "$LOCAL_GSTACK" "$LOCAL_GSTACK.bak" || exit 1
if cp -Rf "$INSTALL_DIR" "$LOCAL_GSTACK" && rm -rf "$LOCAL_GSTACK/.git" && (cd "$LOCAL_GSTACK" && ./setup --refresh-registered); then
  rm -rf "$LOCAL_GSTACK.bak"
  echo "LOCAL_SYNC_OK"
else
  rm -rf "$LOCAL_GSTACK"
  mv "$LOCAL_GSTACK.bak" "$LOCAL_GSTACK" || { echo "ERROR: restore failed; backup retained." >&2; exit 1; }
  echo "ERROR: sync failed; previous vendored copy restored." >&2
  exit 1
fi
```
Only on `LOCAL_SYNC_OK`, tell user: "Also updated vendored copy at `$LOCAL_GSTACK` — commit `.claude/skills/gstack/` when you're ready." Otherwise stop and report the recovery outcome; do not continue migrations or announce success.

### Step 4.75: Run version migrations

After `./setup`, run the migrations in `gstack-upgrade/migrations/` (idempotent
`v{VERSION}.sh` scripts; CONTRIBUTING.md says how to add one) newer than the old
version: they fix state `./setup` alone cannot (stale config, orphaned files).

```bash
MIGRATIONS_DIR="${INSTALL_DIR:?INSTALL_DIR is not set: re-run Step 2 and substitute the printed path}/gstack-upgrade/migrations"
: "${OLD_VERSION:?OLD_VERSION is not set: substitute the value Step 3 printed}"
if [ -d "$MIGRATIONS_DIR" ]; then
  for migration in $(find "$MIGRATIONS_DIR" -maxdepth 1 -name 'v*.sh' -type f 2>/dev/null | sort -V); do
    m_ver="$(basename "$migration" .sh | sed 's/^v//')"
    if [ "$OLD_VERSION" != "unknown" ] && [ "$(printf '%s\n%s' "$OLD_VERSION" "$m_ver" | sort -V | head -1)" = "$OLD_VERSION" ] && [ "$OLD_VERSION" != "$m_ver" ]; then
      echo "Running migration $m_ver..."
      # Without GSTACK_INSTALL_DIR a migration that cleans the install assumes ~/.claude/skills/gstack.
      GSTACK_INSTALL_DIR="$INSTALL_DIR" bash "$migration" || echo "  Warning: migration $m_ver had errors (non-fatal)"
    fi
  done
fi
```

### Step 4.8: Stop any stale daemon (unconditional)

A browse daemon started before the upgrade keeps running the old binary (the
reset and `./setup` do not stop it), so always run this step with the install
directory from Step 2.

```bash
INSTALL_DIR_PLACEHOLDER="<install dir from Step 2>"
NEW_HASH=$(cat "$INSTALL_DIR_PLACEHOLDER/browse/dist/.version" 2>/dev/null || echo "")
_STATE_FILE="${BROWSE_STATE_FILE:-$(git rev-parse --show-toplevel 2>/dev/null || pwd)/.gstack/browse.json}"
if [ -z "$NEW_HASH" ] || [ ! -f "$_STATE_FILE" ]; then
  echo "DAEMON_CHECK=none (no state file or no fresh build hash)"
else
  DAEMON_PID=$(sed -n 's/.*"pid"[[:space:]]*:[[:space:]]*\([0-9][0-9]*\).*/\1/p' "$_STATE_FILE" | head -1)
  DAEMON_PORT=$(sed -n 's/.*"port"[[:space:]]*:[[:space:]]*\([0-9][0-9]*\).*/\1/p' "$_STATE_FILE" | head -1)
  OLD_HASH=$(sed -n 's/.*"binaryVersion"[[:space:]]*:[[:space:]]*"\([^"]*\)".*/\1/p' "$_STATE_FILE" | head -1)
  if [ -z "$DAEMON_PID" ] || ! kill -0 "$DAEMON_PID" 2>/dev/null; then
    echo "DAEMON_CHECK=dead (no live daemon to stop)"
  elif [ "$OLD_HASH" = "$NEW_HASH" ]; then
    echo "DAEMON_CHECK=current (daemon already runs the new binary)"
  elif curl -fsS --max-time 2 "http://127.0.0.1:$DAEMON_PORT/health" 2>/dev/null | grep -q '"status":"healthy"'; then
    echo "DAEMON_CHECK=stale-responsive pid=$DAEMON_PID hash=${OLD_HASH:-unknown} -> $NEW_HASH"
    "$INSTALL_DIR_PLACEHOLDER/browse/dist/browse" stop && echo "DAEMON_STOPPED=yes"
  else
    echo "DAEMON_CHECK=stale-busy pid=$DAEMON_PID hash=${OLD_HASH:-unknown} -> $NEW_HASH"
  fi
fi
```

Substitute the install directory from Step 2, then act on `DAEMON_CHECK`:

1. **`stale-responsive` + `DAEMON_STOPPED=yes`:** Tell the user "Stopped the
   old browse daemon (binary {OLD_HASH} → {NEW_HASH}). The next browse command
   starts a fresh daemon on the new binary."
2. **`stale-busy`:** The daemon runs the old binary but is mid-work — DEFER to
   it, never kill a busy daemon during upgrade. Tell the user: "A browse daemon
   is still running the pre-upgrade binary ({OLD_HASH} → {NEW_HASH}) but is
   busy right now. When it finishes, stop it with `browse stop` — or force it
   immediately with `browse --force-restart stop` (loses that session's
   tabs/cookies/logins)."
3. **`none` / `dead` / `current`:** say nothing.

### Step 5: Write marker + clear cache

```bash
GSTACK_STATE_ROOT=$(~/.claude/skills/gstack/bin/gstack-paths --get GSTACK_STATE_ROOT); : "${GSTACK_STATE_ROOT:?gstack-paths failed; reinstall with ./setup or /gstack-upgrade}"
mkdir -p "$GSTACK_STATE_ROOT"
echo "$OLD_VERSION" > "$GSTACK_STATE_ROOT"/just-upgraded-from
rm -f "$GSTACK_STATE_ROOT"/last-update-check
rm -f "$GSTACK_STATE_ROOT"/update-snoozed
```

### Step 6: Show What's New

Read `$INSTALL_DIR/CHANGELOG.md`. Find all version entries between the old version and the new version. Summarize as 5-7 bullets grouped by theme, user-facing changes first.

Four fields: summarize `git -C "$INSTALL_DIR" log --oneline <PRE_UPGRADE_COMMIT>..HEAD` (≤7 bullets) as "gstack v{old}, main at {sha}".

Format:
```
gstack v{new} — upgraded from v{old}!

What's new:
- [bullet 1]
- [bullet 2]
- ...

Happy shipping!
```

### Step 7: Continue

Continue with the skill the user originally invoked; the upgrade is done.

---

## Standalone usage

When invoked directly as `/gstack-upgrade` (not from a preamble):

1. Force a fresh update check (bypass cache):
```bash
~/.claude/skills/gstack/bin/gstack-update-check --force 2>/dev/null || \
.claude/skills/gstack/bin/gstack-update-check --force 2>/dev/null || true
```

2. If `UPGRADE_AVAILABLE` (three or four fields): follow Steps 2-6 above.

   If `CHECK_FAILED ...`: the remote version could not be read, so the update
   status is unknown. Show the line (it names the URL that failed) and tell the
   user the check failed; never report "already on the latest version". Stop.

3. If no output (primary is up to date): check for a stale local vendored copy.

Run the Step 2 bash block above to detect the primary install type and directory (`INSTALL_TYPE` and `INSTALL_DIR`). Then run the Step 4.5 detection bash block above to check for a local vendored copy (`LOCAL_GSTACK`) and team mode status (`TEAM_MODE`).

**If `LOCAL_GSTACK` is empty** (no local vendored copy): tell the user "You're already on the latest version (v{version})."

**If `LOCAL_GSTACK` is non-empty AND `TEAM_MODE` is `true`:** Remove the vendored copy using the Step 4.5 team-mode removal bash block above. Tell user: "Global v{version} is up to date. Removed stale vendored copy (team mode active). Commit the `.gitignore` change when ready."

**If `LOCAL_GSTACK` is non-empty AND `TEAM_MODE` is NOT `true`**, compare versions:
```bash
PRIMARY_VER=$(cat "${INSTALL_DIR:?INSTALL_DIR is not set: re-run Step 2 and substitute the printed path}/VERSION" 2>/dev/null || echo "unknown")
LOCAL_VER=$(cat "${LOCAL_GSTACK:?LOCAL_GSTACK is not set: re-run the Step 4.5 detection block}/VERSION" 2>/dev/null || echo "unknown")
echo "PRIMARY=$PRIMARY_VER LOCAL=$LOCAL_VER"
```

**If versions differ:** follow the Step 4.5 sync bash block above to update the local copy from the primary. Tell user: "Global v{PRIMARY_VER} is up to date. Updated local vendored copy from v{LOCAL_VER} → v{PRIMARY_VER}. Commit `.claude/skills/gstack/` when you're ready."

**If versions match:** tell the user "You're on the latest version (v{PRIMARY_VER}). Global and local vendored copy are both up to date."