Sep 9, 2025

New in Kiln: Tool Calling and MCP

Kiln v0.20.1 adds tool calling, MCP support, and more!

We just added support for tool-calling and MCP (Model Context Protocol) to Kiln! This new feature includes:

  • Connect any MCP server, remote or local
  • Sample tool servers that are easy to connect: web access (search/crawl/scrape), Python code execution in a sandbox, file access, GitHub integration, and stock quotes
  • You can use Kiln evaluations to test if tool calling improves task performance
  • Share server configs across your team

Tools 101: A Video Introduction

Tools 101 is a beginner-friendly introduction to adding tools to an AI system. In this tutorial, you’ll learn:

  • What AI tools and MCP servers are
  • How to add custom MCP servers
  • The difference between parallel vs. serial tool calling
  • Best practices for designing scalable tool systems

Docs

Check out the Tools & MCP docs for more details on how to use tool-calling and MCP in Kiln.

How to Help (or Get Help)

We're an open source project and we really appreciate community feedback and support! Some ways you can help:

  • Share Kiln with friends and co-workers
  • Star our repo on GitHub.
  • Give feedback on Discord
  • Contribute by fixing or filing issues on our GitHub

Thanks for all your support!
Steve - The Kiln Maintainer

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