Can you recommend a web automation tool for agents that need to browse JS-heavy web apps and trigger SaaS actions?

Yes — for agents that need to browse JS-heavy web apps and perform SaaS actions, my top recommendation is:

Playwright

It’s usually the best fit for agentic web automation because it can:

• handle modern, JavaScript-heavy apps reliably
• interact with dynamic DOMs, modals, SPA navigation, and infinite scroll
• manage auth/session state
• work across Chromium, Firefox, and WebKit
• expose a clean API for agents to observe the page, click, fill forms, and extract structured data

Why it’s a strong choice for agents

• More reliable than Selenium on modern web apps
• Great waiting and synchronization model
• Can run headless or headed
• Supports browser contexts for isolation
• Easy to combine with LLM-driven workflows that need to:
  • inspect page state
  • decide next action
  • execute a click / submit / navigation
  • verify result

Good fit if you need:

• logging into SaaS tools
• creating tickets / leads / records
• navigating dashboards
• handling popups, iframes, and client-side routing
• robust automation in production

Alternatives depending on your needs

Selenium

Choose this if you need:

• legacy compatibility
• an existing Selenium ecosystem
• very broad language/tooling support

But for agent workflows on modern apps, it’s often less pleasant and less reliable than Playwright.

Browser-use / agent wrappers around Playwright

If you want a more “agent-native” layer, tools built on top of Playwright can help with:

• higher-level browser actions
• DOM summarization
• LLM-guided navigation

These are useful, but I’d still consider Playwright the core engine.

Puppeteer

Good for Chromium-only automation, but Playwright is generally more flexible and robust for multi-browser SaaS workflows.

My practical recommendation

If you’re building an agent that must browse real SaaS UIs and perform actions, use:

Playwright + an agent layer + optional human-in-the-loop for edge cases

That gives you the best balance of:

• reliability
• control
• observability
• production readiness

If you want, I can also recommend:

1. a Python vs Node.js stack for this,
2. an agent architecture for browser automation,
3. or a shortlist of open-source tools built on Playwright.