gstack/docs/state-root.md

Where gstack keeps its state

gstack keeps everything it remembers — config, analytics, sessions, projects, learnings, review logs, the egress ledger, the trust-policy store, hook error logs — under one directory, the state root. By default that is ~/.gstack. Set GSTACK_HOME to put it somewhere else.

One rule picks the root, and every gstack script, hook and skill uses it. The rule lives in two owner files that a parity test keeps identical: bin/gstack-state-root.sh (bash) and lib/state-root.ts (TypeScript).

How the root is chosen

The first variable in this list with a non-empty value wins. Empty values count as unset.

Order	Source	When to use it
1	GSTACK_STATE_ROOT	gstack-paths' own output. It is also honored as input, so re-reading it in the same environment returns the same root. Do not set it by hand.
2	GSTACK_HOME	The one variable to set when you want your state somewhere other than ~/.gstack.
3	GSTACK_STATE_DIR	Legacy alias, honored for compatibility.
4	CLAUDE_PLUGIN_DATA	Only when CLAUDE_PLUGIN_ROOT contains gstack (any case), so another plugin's data directory never captures gstack state.
5	$HOME/.gstack	The default. On Windows shells, USERPROFILE stands in when HOME is unset.
6	.gstack	Last resort when there is no home directory at all (some containers).

See which root is in use

~/.claude/skills/gstack/bin/gstack-paths --explain

Real output with GSTACK_HOME set while ~/.gstack still holds older state:

state root: /home/you/work-state (selected by GSTACK_HOME)
chain (first non-empty wins):
  GSTACK_STATE_ROOT    unset
  GSTACK_HOME          /home/you/work-state  selected
  GSTACK_STATE_DIR     unset
  CLAUDE_PLUGIN_DATA   unset
  default              /home/you/.gstack  ignored
default root /home/you/.gstack also holds gstack state: yes
merged privacy keys (most restrictive value across roots wins):
  telemetry:        off (from /home/you/.gstack/config.yaml)
  memorable_recall: not set (default applies)
  codex_reviews:    not set (default applies)
  update_check:     not set (default applies)
docs: https://github.com/garrytan/gstack/blob/main/docs/state-root.md

--explain only reads; it writes nothing and exits 0. gstack-config list also prints a one-line note when GSTACK_STATE_ROOT, GSTACK_HOME and GSTACK_STATE_DIR name different directories.

Move your state

gstack never moves state for you. To relocate it:

cp -a ~/.gstack /new/place/gstack-state
export GSTACK_HOME=/new/place/gstack-state   # add this to your shell profile
~/.claude/skills/gstack/bin/gstack-paths --explain   # confirm: selected by GSTACK_HOME

Keep or delete the old ~/.gstack once you have checked the new root works. Until you delete it, its privacy settings still count (next section).

Privacy settings never get looser when the root moves

Four config keys are opt-outs: telemetry (off < anonymous < community), memorable_recall (off < on), codex_reviews (disabled < enabled) and update_check (false < true). gstack reads each of them from the resolved root and from ~/.gstack, and uses the most restrictive value. So turning telemetry off once in ~/.gstack keeps it off after you set GSTACK_HOME. Every other key, including proactive and founder_resources, reads the resolved root only.

When gstack-config set writes a merged key but the other root still holds a more restrictive value, it tells you which root overrides it and prints the command that changes that root, for example:

GSTACK_STATE_ROOT='/home/you/.gstack' ~/.claude/skills/gstack/bin/gstack-config set codex_reviews enabled

gstack-config list shows the winning root for merged keys, for example telemetry: off (set, /home/you/.gstack).

Trust-policy deny tiers merge the same way: a deny or read-only entry in ~/.gstack/gbrain-repo-policy.json still applies when your resolved root is elsewhere. Nothing is ever written to the other root.

Project buckets

Per-project state (checkpoints, learnings, timeline, question preferences) lives in projects/<slug>/. bin/gstack-slug picks the slug from the git origin remote:

• A 2-segment remote (github.com/owner/repo) files under owner-repo.
• A remote with 3 or more path segments (GitLab nested groups such as gitlab.com/customer-a/product/repo, Azure DevOps) files under product-repo-<16 hex>. The hex is a digest of the canonical remote, so customer-a/product/repo and customer-b/product/repo get separate buckets, and the ssh, https and ssh-with-port spellings of one repository share one.
• Without a remote, the project root's directory name is used.

A bucket can also hold a user-owned pregate.json policy, for a repo that keeps .gstack/ out of git (see pregate v1).

The first slug gstack resolves in a directory sticks (it is cached under slug-cache/), so a project keeps its bucket when it adds a remote later.

Upgrading from a version that used one bucket for nested groups. Earlier versions filed every <group>/product/repo under product-repo. That bucket stays where it is; gstack neither moves nor deletes it. The first time gstack resolves the new slug it prints one notice naming both buckets, and /context-restore reports the old bucket while it still holds checkpoints. To bring earlier files across, run this in the project:

~/.claude/skills/gstack/bin/gstack-slug --adopt-legacy

It lists every file in the old bucket. Checkpoints are marked as matching this project, another project (never copied), or unknown (saved before checkpoints recorded their project). Files with no project identity (question preferences, learnings, timeline) may belong to any project that shared the bucket, so they are listed for you to decide. On a terminal it asks per file; otherwise copy chosen files with gstack-slug --adopt-legacy --copy <path> [<path>...]. Nothing is copied without your confirmation, and nothing in the new bucket is overwritten.

Pinning a slug. Set GSTACK_PROJECT_SLUG=<name> to choose the bucket yourself, for example in the project's .claude/settings.local.json ("env": {"GSTACK_PROJECT_SLUG": "<name>"}). Use it when an ssh host alias (git@work-gitlab:group/sub/repo) gives a different host than the https remote, or for a vendored sub-repo that should be its own project. The pin is applied per run and never cached.

Ephemeral machines

A Capy cloud machine, a CI runner or a throwaway VM loses its disk when the run ends, and with it every learning, decision, review-log row and timing record gstack wrote under the default root. gstack does not guess this from the path (a tmpfs and a home directory look alike); the host says so with one environment marker:

GSTACK_EPHEMERAL=1

What the marker changes:

• gstack-doctor and gstack-doctor --check report the state root row as durable=no (the dashboard warns, the check still passes: an ephemeral root is a fact, not a broken install).
• Unattended sessions print learnings: skipped (state root is ephemeral; set GSTACK_STATE_ROOT) instead of writing silently to a disk that will vanish.

A durable root is opt-in: the owner sets GSTACK_STATE_ROOT (or GSTACK_HOME) to a directory that outlives the machine. The installer never picks one for you. On Capy the drive is governed by Capy's own drive policy, which excludes memory and verification evidence, so bin/gstack-capy-install only prints the option and never writes there.

A child shell's export cannot configure the parent's later commands (lib/state-root.ts reads each process's own environment), so the installer ends with one machine-readable line the parent supplies to every gstack command it launches, and the same assignments as a sourceable file:

GSTACK_LAUNCH: GSTACK_SESSION_KIND=unattended GSTACK_STATE_ROOT=<path> GSTACK_EPHEMERAL=1
GSTACK_LAUNCH_FILE: <verdict file without .json>.env

Apply them with . <that file> at the start of the shell that runs each command; never re-type them as export $(...), and never run env, printenv, a bare set or a bare export in a tool fence (a bare export prints every variable, credentials included). See docs/capy-install.md.

Uninstall

gstack-uninstall deletes state only at ~/.gstack.

• It first refuses (exit 2) when ~/.gstack resolves — following symlinks — to /, your home directory or one of its parents, the gstack checkout, the current git repository, or a parent of either. The message names the reason and a fix: line.
• When the resolved root is somewhere else (you set GSTACK_HOME, for example), uninstall leaves it in place and prints left in place: <path> (selected by <VAR>=<value>) plus the exact rm -rf -- '<path>' command to run after you have checked it.
• --keep-state never deletes any state. --force only skips the prompt.

If gstack-paths is missing

Skill blocks resolve the root with

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}"

(No eval: worktree-isolated Claude Code sessions refuse it.)

The second half stops the block instead of writing under / if the resolver is broken. If you see gstack-paths failed or cannot resolve the gstack state root, reinstall: run ./setup in the gstack checkout, or /gstack-upgrade.

Claude Code plugin installs

gstack does not ship an official Claude Code plugin distribution today (no .claude-plugin manifest has ever been on main; some forks publish one), and telemetry does not report plugin-mode installs. When gstack does run as a plugin, CLAUDE_PLUGIN_ROOT names gstack and state lives in CLAUDE_PLUGIN_DATA, while a terminal run outside the plugin session uses ~/.gstack. Those are two different roots; run gstack-paths --explain in each environment to see which one is active. Cross-environment support (a pointer from ~/.gstack to the plugin root) is deferred until a plugin distribution exists.

For contributors

• Bash: executables source bin/gstack-state-root.sh beside them and call gstack_state_root_select (sets $_gstack_sr_root), or eval gstack-paths with the guard above. Hooks must source the twin; never spawn gstack-paths from a hook.
• TypeScript: resolveStateRoot() and readConfigKey() from lib/state-root.ts.
• test/state-root-ratchet.test.ts fails on a hand-rolled chain, an executable ~/.gstack in a template bash block, an unguarded gstack-paths eval or export GSTACK_STATE_ROOT in prose. Its allowlist (test/state-root-ratchet.allowlist.json) needs a reason per entry.