Browser

/browser skill

You help users automate browsers inside the bsession Docker container — whether it's initial setup, a quick interactive fetch, a scripted automation (one-shot or recurring), or debugging an existing session.

This is a global skill — it works from any repo. bsession is installed at ~/.bsession/, and the bsession CLI is on PATH.

Resolve paths

Before doing anything, determine how to reach bsession. Check in this order:

1. bsession on PATH → use bsession
2. ~/.bsession/bsession exists → use ~/.bsession/bsession
3. ./bsession in current directory → use ./bsession
4. None found but container is running (docker exec agent-browser echo ok) → use docker exec agent-browser python3 /app/session.py as the CLI

Similarly, resolve workspace:

1. ~/.bsession/workspace/ exists → use it
2. ./workspace/ in current directory → use it
3. Ask docker exec agent-browser ls /workspace/conf → use docker exec to access files

Use these resolved paths for all commands throughout the session.

Constants (defaults)

• BSESSION_HOME: ~/.bsession/ — where bsession source + docker-compose live
• WORKSPACE: ~/.bsession/workspace/ (default, overridable) — or resolved per above
• bsession CLI: resolved per above

Routing

Parse the user's slash command arguments:

• No arguments or list → List mode (show all available scripts and sessions)
• setup → Setup mode (install and configure bsession)
• fetch <url> → Fetch mode (interactive one-shot extraction, with option to persist)
• new <name> → Create mode (scaffold a script — one-shot or recurring)
• run <name> → Run mode (execute a saved session and show results)
• Otherwise → Debug mode (inspect/fix an existing session)

Pre-check (all modes except setup)

Before running any mode except setup, verify the container is running:

docker exec agent-browser echo ok 2>/dev/null

If this fails, tell the user to either:

• Run /browser setup for a fresh install, or
• Run docker compose up -d from the bsession project directory

List mode (/browser or /browser list)

Show all available scripts, their status, and what they do.

Step 1: Get session status

bsession list

Step 2: Read script docstrings

For each .py file in ~/.bsession/workspace/scripts/, read the module docstring (the triple-quoted string at the top of the file).

Step 3: Read conf files

For each .conf file in ~/.bsession/workspace/conf/, read the [env] section to show current configuration.

Step 4: Present as a table

Display a summary like:

Session       Status    Type        Description
─────────────────────────────────────────────────────────────────
uscis         running   recurring   USCIS case status monitor
price-check   stopped   one-shot    Amazon product price scraper

Available commands:
  /browser <name>           debug a session
  /browser new <name>       create a new automation
  /browser fetch <url>      quick one-shot fetch

Setup mode (/browser setup)

Run the install script:

bash ~/.openclaw/workspace/skills/browser/scripts/install.sh

Or with options:

bash ~/.openclaw/workspace/skills/browser/scripts/install.sh --workspace /path/to/workspace
bash ~/.openclaw/workspace/skills/browser/scripts/install.sh --vnc-password secret
bash ~/.openclaw/workspace/skills/browser/scripts/install.sh --repo https://github.com/gaxxx/bsession.git

Ask the user for custom options before running. The script handles Docker check, uv/Python install, image build, container start, and CLI setup.

Fetch mode (/browser fetch <url>)

One-shot: open a URL, extract information, return it. No script, no conf file, no loop.

Step 1: Find an available CDP port

docker exec agent-browser python3 -c "
import urllib.request
try:
    urllib.request.urlopen('http://localhost:9222/json/version', timeout=2)
    print('IN_USE')
except:
    print('FREE')
"

If 9222 is in use, try 9223, 9224, etc. Start a temporary Chrome on a free port:

docker exec agent-browser python3 -c "
import sys; sys.path.insert(0, '/app')
from lib.browser import start_chrome
pid = start_chrome(PORT, '/workspace/data/profile-tmp')
print(f'Chrome started, pid={pid}')
"

Step 2: Navigate and extract

docker exec agent-browser agent-browser --cdp PORT open "URL"
sleep 5
docker exec agent-browser agent-browser --cdp PORT snapshot

Handle Cloudflare if detected:

docker exec agent-browser python3 -c "
import sys; sys.path.insert(0, '/app')
from lib.browser import ab, is_cloudflare, wait_for_cloudflare
snap = ab(PORT, 'snapshot')
if is_cloudflare(snap):
    wait_for_cloudflare(PORT, snap)
    snap = ab(PORT, 'snapshot')
print(snap)
"

Step 3: Parse and interact

docker exec agent-browser agent-browser --cdp PORT fill REF "value"
docker exec agent-browser agent-browser --cdp PORT click REF
docker exec agent-browser agent-browser --cdp PORT snapshot

Step 4: Return results

Parse the relevant information and present it cleanly.

Step 5: Offer to persist

After returning results, always ask if the user wants to save as a reusable script. If yes, create a one-shot script + conf in ~/.bsession/workspace/.

Step 6: Cleanup

docker exec agent-browser python3 -c "
import sys; sys.path.insert(0, '/app')
from lib.browser import stop_chrome
stop_chrome(PORT)
"

Create mode (/browser new <name>)

Ask the user:

1. What URL(s) to target
2. One-shot or recurring?
3. What to detect / extract
4. Where to send results (webhook, file, etc.)
5. Env vars needed

Then scaffold ~/.bsession/workspace/conf/<name>.conf and ~/.bsession/workspace/scripts/<name>.py following the conventions in the reference section below.

Run mode (/browser run <name>)

1. Verify session exists: bsession show <name>
2. Run it: bsession run <name>
3. Wait and tail logs: bsession logs <name> -n 50
4. Present results. If failed, switch to debug mode.

Debug mode (/browser <session-id>)

1. Gather state: bsession list, bsession show <id>, read logs and script
2. Diagnose: Cloudflare stuck, element not found, crash, wrong data, process dead
3. Fix the script or conf, then bsession restart <id>

Script conventions

Imports:

import os, re, sys, time
sys.path.insert(0, "/app")
from lib.browser import (
    ab, ab_quiet, find_ref, is_cloudflare, wait_for_cloudflare,
    send_webhook, make_logger,
)

Config from env vars:

port = int(os.environ.get("CDP_PORT", 9222))
session_name = os.environ.get("SESSION_NAME", "<name>")
webhook_url = os.environ.get("N8N_WEBHOOK_URL", "")
check_interval = int(os.environ.get("CHECK_INTERVAL", 1800))

Core pattern: open URL → wait → snapshot → handle Cloudflare → find elements → interact → parse results

One-shot: execute and exit. Recurring: wrap in while True with sleep, compare state, webhook on change.

Reference: lib/browser.py

• ab(port, cmd, *args) / ab_quiet(port, cmd, *args) — run agent-browser commands
• find_ref(snapshot, pattern) / find_all_refs(snapshot, pattern) — parse accessibility tree
• is_cloudflare(snapshot) / wait_for_cloudflare(port, snapshot, ...) — Cloudflare handling
• send_webhook(url, payload) — POST JSON to webhook
• make_logger(session_name) — create timestamped logger