Software Engineering Daily FastMCP with Adam Azzam and Jeremiah Lowin
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Apr 7, 2026 
Adam Azzam, VP of Product at Prefect and core FastMCP maintainer, and Jeremiah Lowin, Prefect founder and primary steward of FastMCP. They trace FastMCP’s origin from MCP, explain the three pillars—servers, clients, apps—and dig into FastMCP 3.0’s re-architecture, decorator-style Python ergonomics, code mode and server-side sandboxing, and how MCP compares to CLIs for enterprise workflows.
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Weekend Prototype Became Official SDK Component
- Jeremiah Lowin built the first FastMCP over a weekend because the low-level MCP SDK felt too awkward for rapid server building.
- He open-sourced it, got a call from Anthropic's MCP inventor, and the code was copied into the official SDK.
Decorator Pattern Is The Ergonomic Win
- The decorator pattern made FastMCP feel Pythonic and dramatically increased ergonomics for server authors.
- FastMCP mirrored FastAPI's endpoint model: decorate a function and it's automatically exposed as an MCP tool.
Hype Forced A Real Architecture Shift
- FastMCP's adoption surged after major vendors pledged MCP support, forcing a re-architecture from many bolt-on features to a cohesive 3.0 design.
- Enterprises then adopted MCP broadly, exposing needs like auth, composition, and apps.
