overleaf-sync

name	overleaf-sync
description	Two-way sync between a local paper directory and an Overleaf project via the Overleaf Git bridge (Premium feature). Lets you keep ARIS audit/edit workflows on the local copy while collaborators edit in the Overleaf web UI. Token never touches the agent — user does the one-time auth via macOS Keychain. Use when user says "同步 overleaf", "overleaf sync", "推送到 overleaf", "connect overleaf", "Overleaf 桥接", "pull overleaf", "push overleaf", or wants to bridge their ARIS paper directory with an Overleaf project.
argument-hint	["setup <project-id> | pull | push | status"]
allowed-tools	Bash(*), Read, Grep, Glob, Edit, Write

Overleaf Sync

Bridge a local paper directory with an Overleaf project so that:

• You can keep editing in the Overleaf web UI (or share editing access with collaborators)
• ARIS can read your changes, run audits (/paper-claim-audit, /citation-audit, /auto-paper-improvement-loop), and push fixes back

This uses the official Overleaf Git bridge (Premium feature). The agent never sees your authentication token — you do the one-time auth manually so the token lives in macOS Keychain, not in chat history or .git/config.

When to Use This Skill

• You want to use Overleaf as the editing surface (better collaboration, shared with team) but still run ARIS pipelines locally
• You want to take an existing local ARIS paper and push it to Overleaf for a co-author to edit
• A collaborator made changes in Overleaf and you want to pull + diff them before continuing local work

Constants

• CLONE_DIR_DEFAULT = paper-overleaf (sibling of existing paper/, NOT inside paper/)
• CREDENTIAL_HELPER = osxkeychain (macOS) / manager (Windows) / cache (Linux fallback)
• TOKEN_HANDLING = NEVER write token to disk, env var, or chat. User pastes it once into the terminal credential prompt; the OS keychain stores it from then on.

Architecture

┌─────────────────┐       git pull/push      ┌─────────────────┐
│  Local paper/   │ ◄─── rsync ──── ►       │ paper-overleaf/ │ ◄──► Overleaf web
│  (ARIS audits)  │                          │ (git bridge)    │     (collaborators)
└─────────────────┘                          └─────────────────┘

The paper-overleaf/ directory is a git clone of the Overleaf project. The paper/ directory is the working copy where ARIS skills run. They are kept in sync via rsync.

Single-source-of-truth rule: at any given time, treat one of them as authoritative for active editing. Switch directions explicitly with pull or push, and run a status check before either to surface unexpected divergence.

Sub-commands

setup <project-id> — one-time

Sets up the bridge for a new Overleaf project. The user runs this in their own terminal, never through the agent. The skill ships with a hardened setup script that:

1. Refuses to run unless stdin/stdout are a TTY (won't run inside an agent harness)
2. Reads the token from a hidden prompt (no chat history, no shell history)
3. Strips the token from the remote URL immediately after cloning
4. Primes the OS keychain so subsequent agent operations are auth-free
5. Auto-installs a pre-commit hook in paper-overleaf/.git/hooks/ that refuses to commit any blob containing the token pattern olp_[A-Za-z0-9]{20,} — a hard technical block, not a behavioral rule

The agent's only role here is to print the user instruction:

Run this in your own terminal (NOT through me):

    bash <ARIS_REPO>/tools/overleaf_setup.sh <project-id-or-url>

When it finishes, tell me "setup done" and I'll verify.

After the user reports "setup done", the agent verifies (token-free):

cd paper-overleaf
git remote -v                    # must show URL WITHOUT token
git config --get credential.helper
git fetch && git log --oneline -3   # must succeed without prompting
ls .git/hooks/pre-commit         # must exist
bash <ARIS_REPO>/tools/overleaf_audit.sh .   # must report "Audit clean"

If paper-overleaf/ exists but is empty (new Overleaf project), the agent then mirrors local paper/ into it (see push workflow).

pull — before each editing session

cd paper-overleaf && git pull --ff-only

# Show what changed since last pull
LAST=$(git rev-parse HEAD@{1})
git diff --stat $LAST..HEAD
git diff $LAST..HEAD -- 'sec/*.tex'        # detailed view for prose changes

Diff protocol — DO NOT blindly merge into local paper/. Overleaf edits frequently include:

• Half-finished sentences (collaborator clicked save mid-thought)
• Typos that aren't in canonical references (Lrage for Large)
• Commented-out blocks that may be intentional or may be a stash
• Number changes that should re-trigger /paper-claim-audit
• Cite key changes that should re-trigger /citation-audit

For each diff hunk, decide one of:

Hunk character	Action
Clean editorial improvement	Sync into paper/, no audit needed
Numerical / claim change	Sync, then re-run /paper-claim-audit
New \cite{...}	Sync, then re-run /citation-audit
Half-sentence / obvious typo	Flag to user, do NOT auto-sync
New section / restructure	Stop, ask user before syncing

After deciding per-hunk:

# Sync only the files the user approved into local paper/
rsync -av paper-overleaf/sec/0.abstract.tex paper/sec/0.abstract.tex
# (or use Edit tool for surgical changes that skip half-sentences)

push — after local editing

Use after ARIS skills have edited paper/ and you want collaborators on Overleaf to see the changes.

# 1. Always pull first to surface remote drift
cd paper-overleaf && git pull --ff-only

# 2. If pull was a no-op, sync local paper → paper-overleaf
rsync -av --delete \
  --exclude='.git' --exclude='.DS_Store' \
  --exclude='*.aux' --exclude='*.log' --exclude='*.bbl' --exclude='*.blg' \
  --exclude='*.fls' --exclude='*.fdb_latexmk' --exclude='*.out' \
  --exclude='*.synctex.gz' --exclude='*.toc' \
  paper/ paper-overleaf/

# 3. Show what would be pushed
git status --short
git diff --stat

# 4. Commit + push
git add -A
git commit -m "<descriptive message — what ARIS changed and why>"
git push

Commit message protocol: include the ARIS skill that produced the change so collaborators on Overleaf understand provenance. Examples:

• paper-write: regenerated sec/3.assurance after audit cascade refactor
• citation-audit: fix 14 metadata entries (madaan2023, lee2024, ...)
• paper-claim-audit: correct sec/5 numbers vs results/run_2026_04_19.json

Confirmation gate: push writes to a shared resource. ALWAYS show the user git diff --stat (and a representative hunk for prose changes) before running git push. Wait for explicit confirmation unless the user said auto: true upfront.

status — diagnostic

cd paper-overleaf
git fetch
echo "=== Remote-vs-local divergence ==="
git log --oneline HEAD..origin/master    # remote ahead
git log --oneline origin/master..HEAD    # local ahead
echo "=== paper/ vs paper-overleaf/ divergence ==="
diff -rq --brief paper/ paper-overleaf/ 2>/dev/null \
  | grep -v "Only in paper/.*\.\(aux\|log\|out\|fls\|fdb_latexmk\|bbl\|blg\|synctex\|toc\)" \
  | grep -v "Only in paper-overleaf/.git" \
  | grep -v "DS_Store"

Three-way state assessment:

Remote ahead?	paper/ vs paper-overleaf/ differ?	Meaning	Recommended action
No	No	Clean	Nothing to do
Yes	No	Overleaf has new edits	Run pull, then re-run status
No	Yes	Local ARIS edits unsynced	Run push
Yes	Yes	Diverged — needs merge	Stop, surface to user, do NOT auto-resolve

Conflict Resolution

If git pull --ff-only fails because of true divergence:

1. Do not run git pull (which would auto-merge).
2. Do not run git reset --hard or git push --force (destructive).
3. Show the user git log origin/master ^HEAD (their Overleaf commits) and git log HEAD ^origin/master (local ARIS commits).
4. Ask the user which side to take per file, or to manually merge in Overleaf and then re-pull.

Token Security — Defense in Depth

Behavioral rules alone are not enough — the next agent reading this skill might forget them. The skill therefore relies on technical guards that hold even if the agent misbehaves:

Layer	Guard	Where enforced
1. Setup	overleaf_setup.sh refuses to run without an interactive TTY (agents don't have one)	tools/overleaf_setup.sh
2. Input	Token is read by read -s (hidden prompt, no shell history, never enters chat)	tools/overleaf_setup.sh
3. Storage	Token goes straight into OS keychain via git credential approve; remote URL is stripped to a token-free form	tools/overleaf_setup.sh
4. Commits	paper-overleaf/.git/hooks/pre-commit greps staged content for olp_[A-Za-z0-9]{20,} and aborts	auto-installed by setup script
5. Audit	overleaf_audit.sh scans working tree, remote URLs, git history, credential files	tools/overleaf_audit.sh

Behavioral rules (still apply, but secondary):

• Never ask the user to paste a token into chat. If they do anyway: (a) acknowledge it, (b) tell them to revoke it at https://www.overleaf.com/user/settings, (c) recover via keychain if already primed.
• Never write a token to a file (.env, .netrc, tools/*.sh, etc.) committed to any repo.
• Never include a token in a git remote -v URL — strip it after clone.
• On 401 Unauthorized from push/pull, tell the user the keychain entry expired and to re-run overleaf_setup.sh. Do not ask for a fresh token.

Mutual-Exclusion Rule

The single biggest source of pain in two-way sync is simultaneous editing on both sides.

• If the user is in an active Overleaf editing session, ARIS skills should read-only access paper/ until the user runs /overleaf-sync pull.
• If ARIS is in the middle of /auto-paper-improvement-loop or /paper-write, the user should pause Overleaf editing until the loop finishes and /overleaf-sync push is run.

When in doubt, run status first.

Output Contract

• paper-overleaf/ directory at repo root, git clone of Overleaf project (origin URL has NO token)
• paper/ directory unchanged in role — still the ARIS working copy
• Each pull/push operation: a one-line summary back to the user (commits pulled / pushed, file count, link to Overleaf project URL)

See Also

• /paper-claim-audit — re-run after pulling Overleaf changes that touch numbers
• /citation-audit — re-run after pulling Overleaf changes that add/edit \cite{...}
• /paper-compile — local LaTeX build; Overleaf compiles independently in the cloud
• Overleaf Git bridge docs: https://www.overleaf.com/learn/how-to/Using_Git_and_GitHub