feat: Integrate FastMCP #106
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This commit integrates FastMCP, a high-level MCP server implementation originally written by Jeremiah Lowin, into the official MCP SDK. It also updates dependencies and adds new dev dependencies. It moves the existing SDK into a .lowlevel .
…erences with defaults Pydantic now uses allOf to combine model references with default values in JSON schema output.
Update all FastMCP examples to use mcp.server.fastmcp instead of fastmcp. Add tests to verify example servers work correctly. Changes: - Update import paths in all example files - Create test_examples.py to verify functionality - Fix test assertions to match actual response format
Update the README.md to include FastMCP as the recommended way to build MCP servers. FastMCP is a high-level, Pythonic interface that makes it easy to build MCP servers with minimal boilerplate. The low-level implementation is still available for more control. 🤖 Generated with Claude CLI. Co-Authored-By: Claude <noreply@anthropic.com>
Add back sections on low-level server implementation, client usage, MCP primitives and server capabilities that were previously removed.
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This personally caused a ton of confusion with fastmcp in https://github.com/jlowin/fastmcp which is not compatible. You may want to add docs to indicate that these are in no way the same package. |
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Summary
mcp.server.fastmcpand expose theFastMCPclass directly asmcp.server.FastMCP.mcp.server.lowlevelbut expose classes still viamcp.serverto allow for backwards compatibilty. There is a low risk of BC breakage if people rely on re-exports particular imports from the current mcp.server.mcp[cli]. The exeutable is now is calledmcpCompatibility
The change should be BC compatible. If not than it's a bug. We will release this as a minor version update,
1.2.0. In version2.0.0of the SDK, FastMCP will likely be renamed toServerand exposed as such directly frommcp.server, while the current SDK implementation will no longer be exposed viamcp.server, but only viamcp.server.lowlevel.Modules Naming
I am not set on the names of the mdoules. Feel free to modify or suggest changes as you see fit.
Test plan