Mastro Connect

Mastro Connect turns browser sessions into a command line interface for web applications so agents can use app APIs.

Mastro Connect turns a browser session into a command line interface for any web application. A small Chrome extension captures minimal credentials locally, allowing a core engine and SDK to replay endpoints as clean JSON commands. It is built for developers and users who want their local coding agents to interact with web apps through native APIs instead of slow browser automation. The system relies on standard OpenAPI 3.1 documents combined with mastro-specific extensions to handle authentication, multi-step workflows, and pagination. Credentials remain strictly local with no external servers, accounts, or telemetry involved during operation.

Mastro Connect at a glance

Best for: Software engineer
Runs on: macOS, Linux, Chrome extension, CLI
Pricing: Free
Released: October 2026
Category: AI coding tool
Website: github.com/mastro-hq/mastro-connect

Key features

Captures browser sessions via a Chrome extension
Converts OpenAPI specs into CLI commands
Supports multi-step workflows and dry runs
Stores credentials securely on local machines
Provides agent skills for shell-based AI assistants
Handles dynamic enums and data extraction

Use it for

Querying campsite availability across state parks
Searching listings and profiles on web platforms
Automating multi-step web app tasks through an agent
Executing API requests from a local command line

Alternatives to Mastro Connect

Mastra — Provides agents, workflows, memory, and observability in one TypeScript framework.
Chrome DevTools MCP — Enables coding agents to interact directly with a real browser instance.
Agent Chrome Relay — Runs in background tabs using real logins without stealing browser focus.
Termius MCP — Connects AI agents directly to Termius sessions and native SFTP transfers.
Kiro — Spec-driven coding with property-based tests to catch hidden bugs
Magpie — It enables AI agents to use models not natively supported by their internal protocols.
Kolo — Teams share one browser session to watch, type, and control AI agents together.
Pw Repl — Shares a single browser session between users and AI agents in real time.
Maestro — Run multiple AI coding agents in parallel with automated workflows and mobile control.
pmtui — Manages long-running agent sessions with an automated heartbeat and dashboard.
HAPI — Runs agents locally on your machine while letting you control them from mobile devices.
Marmot — Consolidates multiple AI and data provider interfaces into one CLI.

All Mastro Connect alternatives