Multi Agent Chrome

Multi-Agent Chrome Orchestrator

Spin up 1-5 parallel Claude Code agents, each with its own Chrome browser, to do browser tasks concurrently.

When to Use

• Submitting contact forms across a list of websites
• Filling out applications on multiple platforms
• Scraping JS-rendered pages that need real browser interaction
• Any repetitive browser task where doing it sequentially is too slow

Architecture

Business workspace (orchestrator)
├── active/multi-chrome-agent/
│   ├── chat.md                    # Shared coordination file
│   ├── launch_chrome.sh           # Spawns Chrome instances on ports 9223-9227
│   ├── kill_chrome.sh             # Tears down all Chrome instances
│   ├── chrome-agent-1/            # Workspace for Agent 1
│   │   ├── .mcp.json              # Chrome DevTools on port 9223
│   │   └── CLAUDE.md              # Agent behavior instructions
│   ├── chrome-agent-2/            # Port 9224
│   ├── chrome-agent-3/            # Port 9225
│   ├── chrome-agent-4/            # Port 9226
│   └── chrome-agent-5/            # Port 9227

Step-by-Step Orchestration

1. Determine how many agents are needed

Look at the task. If there are 10 contact forms to fill, 3-5 agents is good. If there are 3, use 2-3. Don't over-provision.

2. Launch Chrome instances

bash /Users/nicksaraev/Business/active/multi-chrome-agent/launch_chrome.sh [COUNT]

This spawns COUNT Chrome instances on ports 9223+. Wait for the "READY" confirmation for each.

3. Reset the chat file

Clear the chat file and write task assignments:

# Multi-Chrome Agent Chat

## Orchestrator
[2026-03-05 14:30] Launching 3 agents for contact form submission.

### Agent 1 Tasks
1. Go to https://example1.com/contact -> fill name: "Nick Saraev", email: "nick@nicksaraev.com", message: "Hi, I'm interested in..."
2. Go to https://example2.com/contact -> same form fill

### Agent 2 Tasks
1. Go to https://example3.com/contact -> fill form
2. Go to https://example4.com/contact -> fill form

### Agent 3 Tasks
1. Go to https://example5.com/contact -> fill form
2. Go to https://example6.com/contact -> fill form

## Agent 1

## Agent 2

## Agent 3

4. Spawn Claude Code agents

For each agent, open a new terminal and run:

cd /Users/nicksaraev/Business/active/multi-chrome-agent/chrome-agent-N && claude

Where N is 1-5. Each agent will:

• Pick up its CLAUDE.md (browser worker instructions)
• Connect to its Chrome instance via its local .mcp.json
• Read chat.md for its task assignments
• Execute tasks and report status back to chat.md

Programmatic launch via osascript: Claude Code blocks nested sessions via the CLAUDECODE env var. To launch agents programmatically from within an existing session, use osascript with env -u to strip the blocking env vars:

for i in 1 2 3 4 5; do
    osascript -e "tell application \"Terminal\" to do script \"cd /Users/nicksaraev/Business/active/multi-chrome-agent/chrome-agent-$i && env -u CLAUDECODE -u CLAUDE_CODE_ENTRYPOINT -u CLAUDE_AGENT_SDK_VERSION -u CLAUDE_CODE_ENABLE_SDK_FILE_CHECKPOINTING -u CLAUDE_CODE_EXPERIMENTAL_AGENT_TEAMS claude --dangerously-skip-permissions -p 'You are Agent $i. Read /Users/nicksaraev/Business/active/multi-chrome-agent/chat.md, find your tasks under Agent $i, and execute them. Use Chrome DevTools MCP to browse websites, search listings, and collect data. Write your findings as a markdown table back to chat.md under the Agent $i section. Mark yourself as [WORKING] while active and [DONE] when finished.'\""
    sleep 2
done

This opens separate Terminal.app windows, each running an independent Claude Code session with its own Chrome DevTools MCP.

Manual fallback: If osascript doesn't work, tell the user to open N terminal tabs:

Tab 1: cd ~/Business/active/multi-chrome-agent/chrome-agent-1 && claude
Tab 2: cd ~/Business/active/multi-chrome-agent/chrome-agent-2 && claude
...

5. Monitor progress

Read the chat file periodically to check agent status:

cat /Users/nicksaraev/Business/active/multi-chrome-agent/chat.md

Look for [DONE], [ERROR], or [WORKING] tags from each agent.

6. Tear down

When all agents report [DONE]:

bash /Users/nicksaraev/Business/active/multi-chrome-agent/kill_chrome.sh

Chat Protocol

Agents communicate via the shared chat.md file:

Port Map

Port 9222 is reserved for the main (non-parallel) Chrome DevTools MCP.

Edge Cases

• CAPTCHA: Agent reports [ERROR] CAPTCHA on https://... in chat. Orchestrator can reassign or skip.
• Rate limiting: If a site blocks after N requests, spread URLs across more agents so each hits the site fewer times.
• Login required: Pre-authenticate in each Chrome instance before assigning tasks, or include login steps in the task list.
• Long-running tasks: Agents check chat.md every 30s. If the orchestrator needs to abort, write [ABORT] in the Orchestrator section.