Stagehand
www.stagehand.dev- Category
- Developer Tools
- Rank
- No. 152Tools index
- Listed in
- #5 Control a browser
- Pricing
- Open Source
- Platform
- cli · web
- Type
- TOOL
- Builder
- @browserbase
- GitHub
- 24.2k stars
- Latest release
- stagehand-server-v3/v3.7.6
- Date
About
An open-source browser automation SDK that combines the reliability of traditional frameworks like Playwright with AI capabilities for natural language interactions. It allows developers and AI agents to control browsers using simple commands and automatically adapts when web pages change.
What it does
Stagehand is a browser-agent SDK with its own low-level browser driver. It places an extension beside the browser, supplies agents with trimmed accessibility context, and offers both deterministic controls and language-directed action, observation, and structured extraction. It can launch local or Browserbase sessions and supports complex page structures including nested frames and closed shadow roots.
Why it's ranked here
Stagehand presents a serious agent-focused browser stack, not merely a prompt wrapper around page controls. The repository backs that position with a shared protocol, three language SDKs, structured extraction, self-healing behavior, telemetry support, and an extensive evaluation system. Its strongest case is production agent work where token use, recovery, control, and observability all matter.
What's good
The hybrid accessibility trimming gives models less irrelevant page context to process. Developers can mix language-directed primitives with precise locator-based actions instead of committing to one control style. Native handling for nested frames and closed shadow roots addresses difficult browser structures. Batch commands, clipboard access, WebMCP, and OpenTelemetry support broaden the practical automation surface.
Tradeoffs
The preferred setup needs both model-provider and Browserbase credentials, although local browser execution exists. The TypeScript workspace requires a recent Node release and coordinates several toolchains for TypeScript, Python, and Go. Self-healing and model-driven behavior still introduce model configuration, cost, and evaluation work that purely deterministic scripts avoid. Some batch support is explicitly marked experimental.
How to use it well
Use Stagehand for browser agents that must navigate changing sites, extract typed records, or combine judgment with exact page controls. Keep stable interactions deterministic, reserve language-directed steps for ambiguous or shifting interfaces, and validate those flows with the included evaluation tooling. It is aimed at agent execution, not positioned as a replacement for a dedicated browser testing framework.
Technical notes+
The root package.json defines a private pnpm and Turbo workspace, requires Node >=22.18.0, and coordinates unit, browser, integration, build, formatting, lint, Python generation, Go generation, and wheel tasks. packages/protocol/types.ts exposes a large Zod-inferred RPC type surface covering pages, locators, navigation, screenshots, cookies, clipboard, WebMCP, models, and Stagehand operations. packages/sdk-go/browser.go implements local and Browserbase providers, launched or connected origins, exclusive attachment, synchronized teardown, and memoized close results. packages/extension/utils.ts validates and transforms Zod schemas, including URL-to-element-ID substitution and later URL reinjection. packages/evals/cli.ts provides an interactive REPL plus run, list, config, experiment, health, and task-scaffolding commands, while packages/evals/taskConfig.ts discovers evaluation tasks from the filesystem and configures model sets.
Observed
- License
- MIT License
- Languages
- TypeScript, Python, and Go SDKs are maintained in one monorepo.
- Install surface
- The TypeScript SDK is installed as @browserbasehq/stagehand; the workspace also builds Python and Go SDK outputs.
- Interfaces
- Library SDKs provide browser control, language-directed actions, structured extraction, locators, and WebMCP support.
- Browser providers
- Supports locally running browsers and Browserbase browser sessions.
- Workspace tooling
- Uses pnpm, Turbo, uv, Go tooling, and just to coordinate the monorepo.
Read from README.md, package.json, packages/evals/cli.ts, packages/evals/env.ts, packages/evals/utils.ts, packages/evals/errors.ts, packages/evals/initV3.ts, packages/evals/logger.ts, packages/sdk-go/batch.go, packages/evals/scoring.ts, packages/evals/summary.ts, packages/protocol/types.ts, packages/sdk-go/browser.go, packages/extension/utils.ts, packages/evals/taskConfig.ts.
What it can do
Automate browser interactions using natural language commands
Natural language instructions → Executed browser actions
Control web browsers programmatically
Browser automation scripts → Automated web page interactions
Adapt to web page changes automatically
Changed web page elements → Updated automation behavior
Execute traditional browser automation frameworks
Playwright-compatible scripts → Browser automation results
Enable AI agents to interact with web applications
AI agent commands → Web application interactions
Process simple browser control commands
Basic browser commands → Browser state changes
Intel on Stagehand
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