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Garry Tan ff55e532f7 feat: add daily update check script + /gstack-upgrade skill

bin/gstack-update-check: pure bash, checks VERSION against remote once/day,
outputs UPGRADE_AVAILABLE or JUST_UPGRADED. Uses ~/.gstack/ for state.

gstack-upgrade/SKILL.md: new skill with inline upgrade flow for all preambles.
Detects global-git, local-git, vendored installs. Shows What's New from CHANGELOG.

browse/test/gstack-update-check.test.ts: 10 test cases covering all branch paths.

2026-03-13 23:57:05 -05:00

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name, version, description, allowed-tools

name

version

description

allowed-tools

gstack-upgrade

1.0.0

Upgrade gstack to the latest version. Detects global vs vendored install, runs the upgrade, and shows what's new.

Bash

Read

AskUserQuestion

/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

Use AskUserQuestion:

Question: "gstack v{new} is available (you're on v{old}). Upgrade now? Takes ~10 seconds."
Options: ["Yes, upgrade now", "Later (ask again tomorrow)"]

If "Later": Run touch ~/.gstack/last-update-check to reset the 24h timer and continue with the current skill. Do not mention the upgrade again.

Step 2: Detect install type

if [ -d "$HOME/.claude/skills/gstack/.git" ]; then
  INSTALL_TYPE="global-git"
  INSTALL_DIR="$HOME/.claude/skills/gstack"
elif [ -d ".claude/skills/gstack/.git" ]; then
  INSTALL_TYPE="local-git"
  INSTALL_DIR=".claude/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"
else
  echo "ERROR: gstack not found"
  exit 1
fi
echo "Install type: $INSTALL_TYPE at $INSTALL_DIR"

Step 3: Save old version

OLD_VERSION=$(cat "$INSTALL_DIR/VERSION" 2>/dev/null || echo "unknown")

Step 4: Upgrade

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

cd "$INSTALL_DIR"
STASH_OUTPUT=$(git stash 2>&1)
git fetch origin
git reset --hard origin/main
./setup

If $STASH_OUTPUT contains "Saved working directory", warn the user: "Note: local changes were stashed. Run git stash pop in the skill directory to restore them."

For vendored installs (vendored, vendored-global):

PARENT=$(dirname "$INSTALL_DIR")
TMP_DIR=$(mktemp -d)
git clone --depth 1 https://github.com/garrytan/gstack.git "$TMP_DIR/gstack"
mv "$INSTALL_DIR" "$INSTALL_DIR.bak"
mv "$TMP_DIR/gstack" "$INSTALL_DIR"
cd "$INSTALL_DIR" && ./setup
rm -rf "$INSTALL_DIR.bak" "$TMP_DIR"

Step 5: Write marker + clear cache

mkdir -p ~/.gstack
echo "$OLD_VERSION" > ~/.gstack/just-upgraded-from
rm -f ~/.gstack/last-update-check

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. Don't overwhelm — focus on user-facing changes. Skip internal refactors unless they're significant.

Format:

gstack v{new} — upgraded from v{old}!

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

Happy shipping!

Step 7: Continue

After showing What's New, continue with whatever skill the user originally invoked. The upgrade is done — no further action needed.

Standalone usage

When invoked directly as /gstack-upgrade (not from a preamble), follow Steps 2-6 above. If already on the latest version, tell the user: "You're already on the latest version (v{version})."

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