BrowserOS/packages/browseros-agent/apps/eval

BrowserOS Eval

Evaluation framework for benchmarking BrowserOS browser automation agents. Runs tasks from standard datasets (WebVoyager, Mind2Web), captures trajectories with screenshots, and grades results automatically.

Prerequisites

• BrowserOS binary installed at /Applications/BrowserOS.app (macOS)
• Bun runtime
• API keys for your chosen LLM provider and grader model

Quick Start

1. Set up environment

cd apps/eval

Edit .env.development and add your API keys:

# Pick ONE provider for the orchestrator (whichever you have access to)
OPENAI_API_KEY=sk-xxxxx
ANTHROPIC_API_KEY=sk-ant-xxxxx
FIREWORKS_API_KEY=fw_xxxxx
GOOGLE_API_KEY=AIza-xxxxx

# For grading results (OpenRouter recommended — gives access to many models)
OPENROUTER_API_KEY=sk-or-v1-xxxxx

2. Launch the dashboard

bun run eval

Opens the Eval Dashboard at http://localhost:9900 in config mode.

3. Configure and run

From the dashboard:

1. Load a preset — select from the dropdown or click Load File to import a config JSON
2. Edit settings — change agent type, provider, model, API keys, dataset, workers, timeouts
3. Save Config — export your configuration for reuse
4. Click Run — starts the evaluation with live progress

Alternative: Run from CLI

bun run eval -c configs/orchestrator-executor-clado-test.json

Runs immediately. Dashboard still available at http://localhost:9900 for live progress.

Agent Types

Orchestrator-Executor with Clado

The recommended architecture for visual model evals. Two tiers:

• Orchestrator — An LLM that plans and issues high-level instructions
• Executor — The Clado Action visual model that takes screenshots and predicts click/type/scroll coordinates

The orchestrator works with any LLM provider. Pick whichever you have access to:

OpenAI orchestrator

{
  "agent": {
    "type": "orchestrator-executor",
    "orchestrator": {
      "provider": "openai",
      "model": "gpt-4o",
      "apiKey": "OPENAI_API_KEY"
    },
    "executor": {
      "provider": "clado-action",
      "model": "qwen3-vl-30b-a3b-instruct",
      "apiKey": "",
      "baseUrl": "https://clado-ai--clado-browseros-action-actionmodel-generate.modal.run"
    }
  },
  "dataset": "../data/webvoyager_e2e_test.jsonl",
  "output_dir": "../results/oe-clado-openai",
  "num_workers": 3,
  "browseros": {
    "server_url": "http://127.0.0.1:9110",
    "base_cdp_port": 9010,
    "base_server_port": 9110,
    "base_extension_port": 9310,
    "headless": true
  },
  "grader_api_key_env": "OPENROUTER_API_KEY",
  "grader_base_url": "https://openrouter.ai/api/v1",
  "grader_model": "openai/gpt-4.1",
  "timeout_ms": 1200000
}

Anthropic orchestrator

"orchestrator": {
  "provider": "anthropic",
  "model": "claude-sonnet-4-20250514",
  "apiKey": "ANTHROPIC_API_KEY"
}

Google orchestrator

"orchestrator": {
  "provider": "google",
  "model": "gemini-2.0-flash",
  "apiKey": "GOOGLE_API_KEY"
}

Fireworks orchestrator (OpenAI-compatible)

"orchestrator": {
  "provider": "openai-compatible",
  "model": "accounts/fireworks/models/kimi-k2p5",
  "apiKey": "FIREWORKS_API_KEY",
  "baseUrl": "https://api.fireworks.ai/inference/v1"
}

The executor config stays the same across all orchestrator providers — it always uses the Clado action model.

Other Agent Types

Type	Description	Example config
single	Single LLM agent via Gemini CLI + MCP	webvoyager-test.json
tool-loop	AI SDK tool loop, connects via CDP	tool-loop-test.json
gemini-computer-use	Google native computer use API	gemini-computer-use.json
yutori-navigator	Yutori N1 visual model	yutori-navigator.json

Configuration Reference

API keys

The apiKey field supports two formats:

• Env var name: "OPENAI_API_KEY" — resolved from .env.development at runtime
• Direct value: "sk-xxxxx" — used as-is (not recommended, prefer env vars)

Supported providers

Provider	provider value	Requires baseUrl
OpenAI	openai	No
Anthropic	anthropic	No
Google	google	No
Azure OpenAI	azure	Yes
AWS Bedrock	bedrock	No (uses region, accessKeyId, secretAccessKey)
OpenRouter	openrouter	No
Fireworks, Together, etc.	openai-compatible	Yes
Ollama	ollama	No
Clado Action (executor only)	clado-action	Yes

BrowserOS infrastructure

"browseros": {
  "server_url": "http://127.0.0.1:9110",
  "base_cdp_port": 9010,
  "base_server_port": 9110,
  "base_extension_port": 9310,
  "load_extensions": false,
  "headless": true
}

Each worker gets its own Chrome instance. Worker N uses base_port + N for CDP and server ports. base_extension_port is still reserved as a legacy BrowserOS launch argument for compatibility with Chromium builds that still pass it.

Execution settings

Field	Description	Default
num_workers	Parallel workers (each gets its own Chrome)	1
timeout_ms	Per-task timeout in ms	900000 (15 min)
restart_server_per_task	Restart Chrome between tasks (cleaner state, slower)	false

Grading

Results are auto-graded after each task. The grader uses an LLM judge.

Field	Description
grader_model	Model for grading (e.g., openai/gpt-4.1)
grader_api_key_env	Env var name for grader API key
grader_base_url	API endpoint (e.g., https://openrouter.ai/api/v1)

Datasets

File	Tasks	Description
webvoyager_e2e_test.jsonl	10	WebVoyager test subset (quick smoke test)
webvoyager.jsonl	643	Full WebVoyager benchmark
mind2web_e2e_test.jsonl	10	Mind2Web test subset
mind2web.jsonl	300	Full Mind2Web benchmark

Task format (JSONL, one per line):

{
  "query_id": "Amazon--0",
  "dataset": "webvoyager",
  "query": "Search an Xbox Wireless controller with green color and rated above 4 stars.",
  "graders": ["webvoyager_grader", "fara_combined"],
  "start_url": "https://www.amazon.com/",
  "metadata": { "original_task_id": "Amazon--0", "website": "Amazon" }
}

Output

Results are saved to output_dir:

results/
  oe-clado-openai/
    Amazon--0/
      metadata.json         # Task result, timing, grader scores
      messages.jsonl         # Full message log
      screenshots/
        001.png              # Step-by-step screenshots
        002.png
    summary.json             # Aggregate pass rates

Troubleshooting

BrowserOS not found: Expects /Applications/BrowserOS.app/Contents/MacOS/BrowserOS. Make sure it's installed.

Port conflicts: Each worker uses base_port + workerIndex. 3 workers on base 9110 → ports 9110, 9111, 9112. Stop other BrowserOS instances first.

API key not resolving: If your config has "apiKey": "OPENAI_API_KEY", ensure the env var is set in .env.development.

Tasks timing out: Increase timeout_ms. Default is 15 minutes; complex tasks may need 20+ minutes.

Headless vs headed: Set "headless": false to watch Chrome in real-time. Useful for debugging.