Add git-as-state hooks to an agent — auto-commits on Stop, rebases on SessionStart, snapshots on PreCompact. Gives agents durable cross-session memory through their own repo.
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Add git-as-state hooks to an agent — auto-commits on Stop, rebases on SessionStart, snapshots on PreCompact. Gives agents durable cross-session memory through their own repo.
{"mirror":"abilities@dc855a3 plugins/agent-dev/skills/add-git-sync","version":"1.2","created":"2026-04-21T00:00:00.000Z","author":"Ability.ai","changelog":["1.2: The .gitignore block now carries `.claude/settings.json` + `!.claude/settings.json` (plain rule first, negation last). Trinity#2036 ignores that file fleet-wide and untracks a committed copy on every Push — and it is exactly where this skill registers its hooks, so on a deployed agent the entire setup silently ceased to exist. First-run checklist now stages the hook files explicitly and verifies with git check-ignore","1.1: State why the hooks pair with deployment — Trinity deploys by cloning the repo and tracking the branch, so these hooks keep the branch tip the real agent state and make git_pull//trinity:sync carry work forward","1.0: Initial version — installs git-as-state hooks (Stop auto-commit, SessionStart rebase, PreCompact snapshot) so an agent's own repo becomes durable cross-session memory"]}
category
agent-development
Add Git Sync
ℹ️ First, set expectations: before anything else, print one short line with this skill's version and its most recent change — the top entry of metadata.changelog above — e.g. add-git-sync vX.Y — recent: <summary>. Then proceed.
Installs three hooks that turn the agent's own repo into its durable state layer:
Hook
Event
Job
git-session-start.sh
SessionStart (startup/resume)
Stash local drift → fetch → rebase onto remote branch → restore drift. Every session begins consistent with origin.
git-pre-compact.sh
PreCompact
Fast local commit so in-flight work survives context compaction. No push.
git-sync.sh
Stop (async)
git add -A → commit → push with rebase-on-reject retry. Drops .git/SYNC_FAILED if it can't reconcile; SessionStart surfaces the note next run.
Who this is for: any agent whose directory is its own git repo and benefits from cross-session continuity (Trinity-deployed agents, autonomous workers, long-running research agents). Not appropriate for agents nested inside a larger monorepo.
Why this pairs with deployment: Trinity deploys an agent by cloning its GitHub repo and tracking the branch, so the remote agent's state is whatever the branch tip holds. These hooks keep that tip honest — work is committed and pushed at session end instead of lingering uncommitted, so a git_pull (or /trinity:sync) actually carries the agent forward. Install this before deploying, not after the first surprise.
Escape hatches baked in:
touch .git/NO_AUTOSYNC — disables all three hooks
echo "..." > .git/SELF_SELECT_MSG — subagents write structured commit messages that survive the generic Stop-hook commit
.git/SYNC_FAILED — propagates push failures forward to the next session
Process
Step 1: Preflight
Run from inside the target agent directory (or ask the user for the path). Verify:
# 2. CWD is a git repo root (not nested). Resolve both sides with `pwd -P`
# so macOS /tmp vs /private/tmp symlinks don't cause a false positive.
if
"$REPO_ROOT"
then
# Not a git repo — ask whether to init
elif
"$(cd "$REPO_ROOT" && pwd -P)"
"$(pwd -P)"
then
# Nested inside a larger repo — refuse or offer local-only
echo
"ERROR: Agent dir is nested inside $REPO_ROOT. Hooks would push the wrong scope."
exit
fi
# 3. Does .claude/settings.json exist? (create if missing)
# 4. Do any of the target hooks already exist? (if yes, diff and ask)
If no .git/: ask "Initialize git repo here?" If yes, git init.
Step 2: Ask configuration questions
Use AskUserQuestion with these three questions (in order):
Q1 — Sync mode
remote-push (default) — Stop hook commits and pushes
local-only — Stop hook commits but does not push (use when there's no remote or the agent is air-gapped)
Q2 — Remote and branch (only if Q1 = remote-push)
Default: origin / main
If git remote get-url origin fails, ask for the remote URL and set it up before continuing
Q3 — Commit co-author line
Default: Co-Authored-By: Claude <noreply@anthropic.com>
Or blank (no co-author)
Step 3: Install hook scripts
Templates live in this skill's templates/ directory. Copy to the agent's .claude/hooks/ with placeholder substitution:
SKILL_DIR="$(dirname "$0")"# resolved at runtime
TEMPLATES="$SKILL_DIR/templates"
HOOKS_DIR="$AGENT_DIR/.claude/hooks"mkdir -p "$HOOKS_DIR"substitute() {
local src="$1" dst="$2"
sed -e "s|__BRANCH__|$BRANCH|g" \
-e "s|__REMOTE__|$REMOTE|g" \
-e "s|__COAUTHOR__|$COAUTHOR|g" \
"$src" > "$dst"chmod +x "$dst"
}
if [ "$MODE" = "remote-push" ]; then
substitute "$TEMPLATES/git-session-start.sh""$HOOKS_DIR/git-session-start.sh"
substitute "$TEMPLATES/git-pre-compact.sh""$HOOKS_DIR/git-pre-compact.sh"
substitute "$TEMPLATES/git-sync.sh""$HOOKS_DIR/git-sync.sh"else# local-only: no SessionStart (no remote to rebase from)
substitute "$TEMPLATES/git-pre-compact.sh""$HOOKS_DIR/git-pre-compact.sh"
substitute "$TEMPLATES/git-sync-local.sh""$HOOKS_DIR/git-sync.sh"fi
Idempotency: before overwriting any existing hook file, diff content. If identical, skip silently. If different, show the diff and ask the user whether to overwrite.
Step 4: Merge into .claude/settings.json
Load existing settings (create {} if missing), merge the hooks block, write back. Use jq to keep the JSON canonical:
SETTINGS="$AGENT_DIR/.claude/settings.json"
[ -f "$SETTINGS" ] || echo'{}' > "$SETTINGS"# Build the hooks JSON we want to ensure is present
NEW_HOOKS=$(jq -n --arg mode "$MODE"'{
SessionStart: (if $mode == "remote-push" then [{
matcher: "startup|resume",
hooks: [{
type: "command",
command: "\"$CLAUDE_PROJECT_DIR\"/.claude/hooks/git-session-start.sh",
timeout: 20,
statusMessage: "Syncing from git..."
}]
}] else null end),
PreCompact: [{
hooks: [{
type: "command",
command: "\"$CLAUDE_PROJECT_DIR\"/.claude/hooks/git-pre-compact.sh",
timeout: 15,
statusMessage: "Snapshotting pre-compact..."
}]
}],
Stop: [{
hooks: [{
type: "command",
command: "\"$CLAUDE_PROJECT_DIR\"/.claude/hooks/git-sync.sh",
timeout: 45,
statusMessage: "Syncing to git...",
async: true
}]
}]
} | with_entries(select(.value != null))')
# Merge: existing + new (new entries fill gaps; do NOT overwrite existing hook arrays# for the same event — append instead, and warn the user if there are duplicates).
jq --argjson new "$NEW_HOOKS"'
.hooks = (
(.hooks // {}) as $existing
| $new as $toAdd
| reduce ($toAdd | keys_unsorted[]) as $event ($existing;
.[$event] = (( .[$event] // [] ) + $toAdd[$event])
)
)
'"$SETTINGS" > "$SETTINGS.tmp" && mv"$SETTINGS.tmp""$SETTINGS"
Idempotency check: before merging, scan existing hooks.<event> arrays for any entry whose command already points at .claude/hooks/git-*.sh. If found, skip that event and print [already installed].
Step 5: Append runtime-state exclusions to .gitignore
Add only entries not already present. Block-wrap with a header so it's clear what added them:
# --- agent-dev:add-git-sync runtime exclusions ---
# Trinity (#2036) ignores .claude/settings.json fleet-wide and `git rm --cached`s
# an already-committed copy on the next Push, because the base image bakes its own
# container-only copy and HOME is the repo root. THIS SKILL registers its hooks in
# that file — so on a Trinity-deployed agent the registration would be untracked and
# the whole setup would silently stop existing. Emit BOTH lines, plain rule FIRST:
# the plain line satisfies Trinity's exact-line `grep -qxF` gate so it stops appending
# its own copy at the end of the file, and the negation comes last so git's
# last-match-wins re-includes the file.
.claude/settings.json
!.claude/settings.json
.claude/projects/
.claude/statsig/
.claude/todos/
.claude/debug/
.claude/sessions/
.claude/shell-snapshots/
.claude/telemetry/
.claude/cache/
.claude/backups/
.claude.json
.mcp.json
.env
*.key
*.pem
credentials.json
# --- end add-git-sync ---
Before appending, grep each line against the existing .gitignore and skip duplicates. If the entire block header is already present, skip the section entirely.
Step 6: Add a section to the agent's CLAUDE.md
Check if a ## Git Sync or **[GIT SYNC (AUTOMATIC)]** section already exists. If yes, skip. If no, append:
---
## Git Sync (Automatic)
Three hooks manage git sync for this agent. Defined in `.claude/settings.json`, scripts in `.claude/hooks/`.
| Hook | Script | Purpose |
|---|---|---|
| `SessionStart` | `git-session-start.sh` | Auto-stash drift, fetch + rebase onto `<REMOTE>/<BRANCH>`, restore drift. |
| `PreCompact` | `git-pre-compact.sh` | Snapshot commit before compaction so mid-flight work survives context loss. No push. |
| `Stop` (async) | `git-sync.sh` | Commit staged files, push with rebase-on-reject retry (max 2). Honors `.git/SELF_SELECT_MSG` for structured commit messages. |
**Escape hatches:**-`touch .git/NO_AUTOSYNC` — disable all three hooks until removed
-`echo "msg" > .git/SELF_SELECT_MSG` — override Stop-hook commit message (consumed after use)
-`.git/SYNC_FAILED` — written when push can't reconcile; surfaced in next SessionStart
**Design principle:** hooks enforce session-boundary consistency. Inside a session the agent is free; at boundaries (start / compact / stop) the repo reconciles.
Substitute <REMOTE> and <BRANCH> (or drop the SessionStart row entirely in local-only mode).
Step 7: Smoke test
Before declaring success, run:
# Syntax check each hookfor h in"$HOOKS_DIR"/git-*.sh; do
bash -n "$h" || { echo"SYNTAX ERROR in $h"; exit 1; }
done# settings.json parses
jq empty "$SETTINGS" || { echo"settings.json is invalid JSON"; exit 1; }
# .gitignore parses (just ensure it's readable)
[ -r "$AGENT_DIR/.gitignore" ]
Print a summary of what was added and what was skipped (idempotent no-ops).
Step 8: Print next steps
## Git Sync Installed
Mode: **<MODE>** (remote-push / local-only)
Remote: `<REMOTE>/<BRANCH>` (if applicable)
### What's active- SessionStart: auto-rebase onto remote
- PreCompact: safety snapshot
- Stop: auto-commit (and push, if remote-push)
### First-run checklist1. Commit this setup: `git add .claude/hooks/ .claude/settings.json .gitignore CLAUDE.md && git commit -m "Add git-sync hooks"` — then verify the negation actually wins with `git check-ignore -v .claude/settings.json` (it should report the `!` line, or report nothing). If `settings.json` is ignored, the hooks are registered nowhere on any clone but this one.
2. If remote-push: confirm `git remote -v` points at the right repo
3. Trigger a test: make a trivial edit, let the session end, verify a Heartbeat commit appears
### Disable temporarily`touch .git/NO_AUTOSYNC` — re-enable by deleting the file.
Notes
Prerequisite:jq must be installed (it's used by every hook and by this skill's settings merge). Check with command -v jq in Step 1; bail with install instructions if missing.
Monorepo guard: the preflight refuses to install when the agent dir is nested inside a larger repo. The user can either pull the agent into its own repo or pick local-only mode at their own risk (the Stop hook would still commit to the wrong scope — safer to refuse).
Co-author line: the __COAUTHOR__ placeholder is substituted as a single line. If the user wants multi-line sign-offs, they can edit git-sync.sh directly post-install.
Re-running is safe. Every write checks for prior state. Running the skill twice produces no diff on the second run.
