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Add v3 breaking changes notice to README and docs (#2713)

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Jeremiah Lowin 2025-12-24 16:04:46 -05:00 • committed by GitHub
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README.md
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@ -33,6 +33,9 @@
>
> **For production MCP applications, install FastMCP:** `pip install fastmcp`
> [!Important]
> FastMCP 3.0 is in development and may include breaking changes. To avoid unexpected issues, pin your dependency to v2: `fastmcp<3`
---
**FastMCP is the standard framework for building MCP applications**, providing the fastest path from idea to production.

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docs/getting-started/installation.mdx
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@ -23,6 +23,10 @@ Alternatively, you can install it directly with `pip` or `uv pip`:
```
</CodeGroup>
<Warning>
**FastMCP 3.0** is in development and may include breaking changes. To avoid unexpected issues, pin your dependency to v2: `fastmcp<3`
</Warning>
### Verify Installation
To verify that FastMCP is installed correctly, you can run the following command:

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docs/getting-started/welcome.mdx
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@ -35,7 +35,6 @@ if __name__ == "__main__":
mcp.run()
```
## Beyond Basic MCP
FastMCP pioneered Python MCP development, and FastMCP 1.0 was incorporated into the [official MCP SDK](https://github.com/modelcontextprotocol/python-sdk) in 2024.
@ -46,6 +45,10 @@ Ready to build? Start with our [installation guide](/getting-started/installatio
FastMCP is made with 💙 by [Prefect](https://www.prefect.io/).
<Warning>
**FastMCP 3.0** is in development and may include breaking changes. To avoid unexpected issues, pin your dependency to v2: `fastmcp<3`
</Warning>
## What is MCP?
The Model Context Protocol lets you build servers that expose data and functionality to LLM applications in a secure, standardized way. It is often described as "the USB-C port for AI", providing a uniform way to connect LLMs to resources they can use. It may be easier to think of it as an API, but specifically designed for LLM interactions. MCP servers can: