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A Python framework that extends standard MCP servers with production capabilities. Drop-in replacement for FastMCP:change one import and you get:

Quick Reference

Sections

Transitions

Stages, transitions, and progressive tool disclosure

State

Per-session persistent state with snapshotting

Backends

Plain, Search, Plan, and Code execution modes

Tools

Define and expose tools to AI agents

Resources

Expose read-only data to clients

Widgets

Interactive UI rendered in AI conversations