cookie-sync

SKILL.md

Cookie Sync — Local Chrome → Browserbase Context

Exports cookies from your local Chrome and saves them into a Browserbase persistent context. After syncing, use the browse CLI to open authenticated sessions with that context.

Supports domain filtering (only sync cookies you need) and context reuse (refresh cookies without creating a new context).

Prerequisites

Chrome (or Chromium, Brave, Edge) with remote debugging enabled

If your browser build exposes chrome://flags/#allow-remote-debugging, enable it and restart the browser

Otherwise, launch with --remote-debugging-port=9222 --user-data-dir=/tmp/chrome-debug and set CDP_URL=ws://127.0.0.1:9222

At least one tab open in Chrome

Node.js 22+

Environment variable: BROWSERBASE_API_KEY

Setup

Install dependencies before first use:
cd .claude/skills/cookie-sync && npm install

Usage

Basic — sync all cookies

node .claude/skills/cookie-sync/scripts/cookie-sync.mjs

Creates a persistent context with all your Chrome cookies. Outputs a context ID.

Filter by domain — only sync specific sites

node .claude/skills/cookie-sync/scripts/cookie-sync.mjs --domains google.com,github.com

Matches the domain and all subdomains (e.g. google.com matches accounts.google.com, mail.google.com, etc.)

Refresh cookies in an existing context

node .claude/skills/cookie-sync/scripts/cookie-sync.mjs --context ctx_abc123

Re-injects fresh cookies into a previously created context. Use this when cookies have expired.

Verified browser mode

node .claude/skills/cookie-sync/scripts/cookie-sync.mjs --verified

Enables Browserbase Identity with a Verified browser to improve access on protected sites. Recommended for sites like Google that fingerprint browsers.

Residential proxy with geolocation

node .claude/skills/cookie-sync/scripts/cookie-sync.mjs --proxy "San Francisco,CA,US"

Routes through a residential proxy in the specified location. Format: "City,ST,Country" (state is 2-letter code). Helps match your local IP's geolocation so auth cookies aren't rejected.

Combine flags

node .claude/skills/cookie-sync/scripts/cookie-sync.mjs --domains github.com,google.com --verified --proxy "San Francisco,CA,US"

Browsing Authenticated Sites

After syncing, use the browse CLI with the context ID:

SESSION_JSON="$(browse cloud sessions create --context-id <ctx-id> --persist --keep-alive)"
SESSION_ID="$(echo "$SESSION_JSON" | jq -r .id)"
CONNECT_URL="$(echo "$SESSION_JSON" | jq -r .connectUrl)"

browse open https://mail.google.com --cdp "$CONNECT_URL"

The --persist flag on browse cloud sessions create saves any new cookies or state changes back to the context when the cloud session is released, keeping the session fresh for next time.

Full workflow example:

# Step 1: Sync cookies for Twitter
node .claude/skills/cookie-sync/scripts/cookie-sync.mjs --domains x.com,twitter.com
# Output: Context ID: ctx_abc123

# Step 2: Browse authenticated Twitter
SESSION_JSON="$(browse cloud sessions create --context-id ctx_abc123 --persist --keep-alive)"
SESSION_ID="$(echo "$SESSION_JSON" | jq -r .id)"
CONNECT_URL="$(echo "$SESSION_JSON" | jq -r .connectUrl)"

browse open https://x.com/messages --cdp "$CONNECT_URL"
browse snapshot
browse screenshot
browse stop
browse cloud sessions update "$SESSION_ID" --status REQUEST_RELEASE

Reusing Contexts for Scheduled Jobs

Contexts persist across sessions, making them ideal for scheduled/recurring tasks:

Once (laptop open): Run cookie-sync → get a context ID

Scheduled jobs: Create a Browserbase session with browse cloud sessions create --context-id <ctx-id> --persist --keep-alive, then attach with browse open <url> --cdp <connectUrl> — no local Chrome needed

Re-sync as needed: When cookies expire, run cookie-sync again with --context <ctx-id> to refresh

Troubleshooting

"No DevToolsActivePort found" → Enable chrome://flags/#allow-remote-debugging if your browser build exposes it, or launch with --remote-debugging-port=9222 and set CDP_URL=ws://127.0.0.1:9222

"No open page targets found" → Open at least one tab in Chrome

"WebSocket error" → Chrome may be hung; force quit and reopen it

Cookies expired in context → Re-run cookie-sync with --context <id> to refresh

Auth rejected by site → Try adding --verified and/or --proxy with a location near you