flyto-core

Overview

flyto-core is an open-source execution engine for AI agents that provides a comprehensive set of tools through MCP. It offers 412 modules across 78 categories including browser automation, API calls, file operations, and data processing. The system features execution tracing, replay functionality from any step, and evidence snapshots. Users can create workflows using YAML configuration files with over 30 built-in recipes available for common automation tasks. The server can be used as an MCP server, HTTP API, Python API, or CLI tool, making it versatile for different integration needs.

Try asking AI

After installing, here are 5 things you can ask your AI assistant:

• string.reverse

  Reverse the characters in a string

  Try:Reverse the string 'hello world'Try:How do I reverse a text string?
• browser.launch

  Launch a browser instance

  Try:Launch a Chrome browserTry:Start a new browser session
• browser.goto

  Navigate to a URL in the browser

  Try:Go to https://example.comTry:Navigate to my website
• browser.evaluate

  Execute JavaScript code in the browser

  Try:Get all the links on this pageTry:Run JavaScript to extract product prices
• browser.screenshot

  Take a screenshot of the current page

  Try:Take a screenshot of this pageTry:Capture a full-page screenshot
• browser.viewport

  Set the browser viewport size

  Try:Set viewport to mobile sizeTry:Resize browser to 390x844
• browser.performance

  Get browser performance metrics

  Try:Get page performance metricsTry:Measure page load time
• browser.close

  Close the browser instance

  Try:Close the browserTry:End the browser session
• file.write

  Write content to a file

  Try:Save this data to prices.jsonTry:Write the results to a file
• file.read

  Read content from a file

  Try:Read the contents of data.csvTry:Load the configuration file
• array.filter

  Filter an array based on a condition

  Try:Filter this array to only include items over $100Try:Get only the active users from this list
• api.call

  Make an API request to a web service

  Try:Call the OpenAI API with this promptTry:Get data from the REST API

Comparable tools

Installation

pip install flyto-core            # Core engine + CLI + MCP server
pip install flyto-core[browser]   # + browser automation (Playwright)
playwright install chromium        # one-time browser setup

{
  "mcpServers": {
    "flyto-core": {
      "command": "python",
      "args": ["-m", "core.mcp_server"]
    }
  }
}

claude mcp add flyto-core -- python -m core.mcp_server

FAQ

How is flyto-core different from Playwright?

Flyto-core wraps Playwright with execution tracing, replay functionality, and over 400 additional modules for different task types. It provides a more structured workflow approach where each step can be traced and replayed independently.

Can I use flyto-core without MCP?

Yes, flyto-core can be used as a CLI tool, HTTP API, or Python API independently of MCP. MCP is just one integration method.

On Hacker News

Recent discussion from the developer community.

• Show HN: What if YAML was a programming language? (412 built-in modules)▲ 1💬 1
  Story by ChesterHsu · 2026-02-24

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