Web UI Testing with agent-browser

Use agent-browser as the default CLI for deterministic UI checks.

Install agent-browser

macOS/Linux (recommended)

npm install -g agent-browser agent-browser install

Linux containers/VMs that need extra browser libs

agent-browser install --with-deps

Alternative install on macOS:

brew install agent-browser agent-browser install

Configure for Reliable Runs

Use isolated state for each test target:

one session per test flow

agent-browser --session login-flow open https://example.com

persistent auth/session state per app

agent-browser --profile ~/.agent-browser/myapp open https://example.com

Set environment variables for CI:

export AGENT_BROWSER_SESSION=ci export AGENT_BROWSER_PROFILE="$PWD/.tmp/agent-browser-profile" export AGENT_BROWSER_PROVIDER=local

Optional cloud providers:

• Browserbase: set AGENT_BROWSER_PROVIDER=browserbase , BROWSERBASE_API_KEY , BROWSERBASE_PROJECT_ID

• Browser Use: set AGENT_BROWSER_PROVIDER=browseruse , BROWSER_USE_API_KEY

• Kernel: set AGENT_BROWSER_PROVIDER=kernel , KERNEL_API_KEY

For proxy testing:

export AGENT_BROWSER_PROXY="http://user:pass@proxy-host:port"

Install the Upstream Skill (Optional)

If your runtime supports skill installation, add the upstream skill:

eve skill install https://github.com/vercel-labs/agent-browser

Core Workflow

Run every flow in this sequence:

• Navigate: agent-browser open <url>

• Snapshot interactive refs: agent-browser snapshot -i

• Interact with refs: agent-browser click @e1 , agent-browser fill @e2 "value"

• Re-snapshot after page changes: agent-browser snapshot -i

• Assert output: agent-browser get text <selector-or-ref>

• Capture artifacts: agent-browser screenshot <path>

Minimal Test Template

agent-browser --session smoke open https://example.com/login agent-browser --session smoke snapshot -i agent-browser --session smoke fill @e1 "user@example.com" agent-browser --session smoke fill @e2 "password" agent-browser --session smoke click @e3 agent-browser --session smoke wait --url "**/dashboard" agent-browser --session smoke screenshot ./artifacts/login-dashboard.png agent-browser --session smoke close

Guardrails

• Re-snapshot after every navigation or dynamic UI update; refs become stale.

• Prefer snapshot -i refs over brittle CSS selectors.

• Use --json for machine-readable assertions in scripts.

• Keep one session/profile per environment to avoid cross-test leakage.

• Save screenshots and logs as artifacts for failed runs.

References and Templates

• Full commands: references/commands.md

• Ref lifecycle: references/snapshot-refs.md

• Session strategy: references/session-management.md

• Authentication flows: references/authentication.md

• Proxy setup: references/proxy-support.md

• Video capture: references/video-recording.md

• Reusable scripts: templates/*.sh