Stagehand is an open-source AI browser automation framework designed for building resilient, production-ready browser agents. Developed by the team behind Browserbase, it addresses the common maintenance challenges associated with traditional browser automation tools like Playwright or Selenium, where brittle CSS selectors break whenever a website undergoes UI changes. By leveraging artificial intelligence to resolve instructions at runtime, Stagehand allows developers to create automations that survive page redesigns and unpredictable web behavior while maintaining the deterministic control expected of traditional code. The SDK functions as a bridge between high-precision scripted tasks and flexible AI agent behavior. It exposes four core primitives—act, extract, observe, and agent—that provide different levels of abstraction. These primitives can be used individually for precise step-by-step control or combined within an agent to manage complex, multi-step workflows. Stagehand supports both local execution with any Chromium-based browser and cloud-based deployment via Browserbase, which offers additional capabilities such as session replay, captcha solving, and infrastructure management. Developers can integrate Stagehand into existing workflows, utilizing TypeScript or Python, and can customize agent behavior through system prompts, custom tools, and integration with various LLM providers via the Vercel AI SDK or Browserbase's Model Gateway.

Some of the key features are:

• Act: Perform precise browser actions like clicking, filling, navigating, and scrolling using natural language.
• Extract: Pull structured data from any webpage using Zod schema validation for type-safe results.
• Observe: Analyze the current page state to identify actionable elements before proceeding with operations.
• Agent: Execute complex, multi-step workflows autonomously with customizable models and tools.
• Self-Healing: AI-powered resolution of instructions ensures automations remain functional despite DOM changes.
• Hybrid Mode: Combine DOM-based actions with coordinate-based visual understanding for enhanced agent capability.
• Extensibility: Support for custom tools, MCP integrations, and web search capabilities to handle tasks beyond simple navigation.
• Production-Ready: Native compatibility with Browserbase for cloud browser infrastructure, session replay, and observability.

To operate Stagehand, developers initiate a session and select the desired primitives. For simple, deterministic tasks, one might use 'act' and 'extract' to interact with specific UI elements and pull data. For more exploratory or multi-step tasks, the 'agent' primitive is used by specifying an instruction, a model, and a maximum number of steps. The SDK handles the interaction logic, interpreting natural language and translating it into actionable browser events. Configuration options allow for viewport settings, logging, and observability settings. When scaling to production, the SDK can be configured to use cloud-based browsers, which facilitates zero-infrastructure deployment and advanced features like captcha solving and action caching.

Some common use cases include:

• Web Scraping: Extracting structured pricing, contact info, or product details from dynamic websites without maintaining brittle selectors.
• End-to-End Testing: Creating test suites that are more resilient to UI updates compared to traditional hardcoded test scripts.
• Autonomous Agents: Building agents that handle complex user journeys, such as signing up for services, filling out multi-page forms, or applying for jobs.
• Workflow Automation: Automating repetitive browser-based tasks like logging into legacy portals, navigating complex checkout flows, or collecting data from multiple web sources.