Brought to you by Do Browser.

A browser automation tool that lets AI agents and developers control browsers with sandboxed JavaScript scripts.

Key features:

• Sandboxed execution - Scripts run in a QuickJS WASM sandbox with no host access
• Persistent pages - Navigate once, interact across multiple scripts
• Auto-connect - Connect to your running Chrome or launch a fresh Chromium
• Full Playwright API - goto, click, fill, locators, evaluate, screenshots, and more

CLI Installation

npm install -g dev-browser
dev-browser install    # installs Playwright + Chromium

Windows is not currently supported.

Quick start

# Launch a headless browser and run a script
dev-browser --headless <<'EOF'
const page = await browser.getPage("main");
await page.goto("https://example.com");
console.log(await page.title());
EOF

# Connect to your running Chrome (enable at chrome://inspect/#remote-debugging)
dev-browser --connect <<'EOF'
const tabs = await browser.listPages();
console.log(JSON.stringify(tabs, null, 2));
EOF

Using with AI agents

After installing, just tell your agent to run dev-browser --help — the help output includes a full LLM usage guide with examples and API reference. No plugin or skill installation needed.

Claude Code

/plugin marketplace add sawyerhood/dev-browser
/plugin install dev-browser@sawyerhood/dev-browser

Restart Claude Code after installation.

Amp / Codex

Copy the skill to your skills directory:

# For Amp: ~/.claude/skills | For Codex: ~/.codex/skills
SKILLS_DIR=~/.claude/skills  # or ~/.codex/skills

mkdir -p $SKILLS_DIR
git clone https://github.com/sawyerhood/dev-browser /tmp/dev-browser-skill
cp -r /tmp/dev-browser-skill/skills/dev-browser $SKILLS_DIR/dev-browser
rm -rf /tmp/dev-browser-skill

Script API

Scripts run in a sandboxed QuickJS runtime (not Node.js). Available globals:

// Browser control
browser.getPage(nameOrId)    // Get/create named page, or connect to tab by targetId
browser.newPage()            // Create anonymous page (cleaned up after script)
browser.listPages()          // List all tabs: [{id, url, title, name}]
browser.closePage(name)      // Close a named page

// File I/O (restricted to ~/.dev-browser/tmp/)
await saveScreenshot(buf, name)   // Save screenshot buffer, returns path
await writeFile(name, data)       // Write file, returns path
await readFile(name)              // Read file, returns content

// Output
console.log/warn/error/info       // Routed to CLI stdout/stderr

Pages are full Playwright Page objects — goto, click, fill, locator, evaluate, screenshot, and everything else, including page.snapshotForAI({ track?, depth?, timeout? }), which returns { full, incremental? } for AI-friendly page snapshots.

Benchmarks

| Method | Time | Cost | Turns | Success | | ----------------------- | ------- | ----- | ----- | ------- | | Dev Browser | 3m 53s | $0.88 | 29 | 100% | | Playwright MCP | 4m 31s | $1.45 | 51 | 100% | | Playwright Skill | 8m 07s | $1.45 | 38 | 67% | | Claude Chrome Extension | 12m 54s | $2.81 | 80 | 100% |

See dev-browser-eval for methodology.

License

MIT

Author

Sawyer Hood