Causeway

Rust MCP server that gives AI assistants complete control of a real Chromium browser through CDP.

Causeway is a Rust binary that speaks MCP over stdio to an AI assistant and CDP over WebSocket to Chromium. It provides navigation, tab management, clicking, typing, form filling, screenshots, page reading, accessibility snapshots, JavaScript evaluation, cookie control, network monitoring, file downloads, PDF saving, device emulation, and more, with no extension, Node, or Python runtime.

Best for agent capabilities

Browser automation Code execution

Useful in agent tasks

Research the web

Find, inspect, extract, and synthesize reliable information from the open web.

Build and deploy software

Write, execute, test, and ship code from an agent workflow.

Overview

Websitewildernessinteractive.com/causeway

Authnone

Pricing$0

SDKs—

OpenAPINo

MCP SupportYes

When to use Causeway

Causeway is listed for Browser, Code Execution workflows. Causeway is a Rust binary that speaks MCP over stdio to an AI assistant and CDP over WebSocket to Chromium. It provides navigation, tab management, clicking, typing, form filling, screenshots, page reading, accessibility snapshots, JavaScript evaluation, cookie control, network monitoring, file downloads, PDF saving, device emulation, and more, with no extension, Node, or Python runtime. Consider it when an agent needs this capability through a documented service boundary instead of custom infrastructure maintained inside the application.

In 4agent’s task model, the product maps to Browser automation, Code execution. That makes it a candidate for these tasks: Research the web, Build and deploy software.

Integration checklist

Access: Confirm the none authentication flow, credential scope, rotation process, and whether calls can be attributed to a user or service identity.
Client support: No SDK is recorded, so verify the HTTP API or another supported integration path.
Automation: OpenAPI: not currently recorded; MCP: listed as available; CLI: not currently recorded. Confirm each requirement in the provider's current documentation.
Operations: Test rate limits, timeouts, retry safety, error payloads, logs, data retention, and the current paid pricing model with production-like volume.

Sources and verification

Use these primary sources to verify current behavior before making an implementation or purchasing decision. Product capabilities, limits, and prices can change after a 4agent listing is reviewed.