F# Weekly #28 — Mibo 2.0, Fable 5.7, and Cast Shadows in F#

Welcome to F# Weekly,

A roundup of F# content from this past week:

News

• SharpLsp – Open Source C# and F# Language Server for VS Code, Zed, and More
• Deslop — Live MCP + LSP duplicate-code server for AI agents

Microsoft News

• Modernize .NET applications in the GitHub Copilot app
• Announcing TypeScript 7.0 – TypeScript
• Let’s Learn GitHub Copilot App – Free Virtual Training Event – Microsoft for Developers
• Visual Studio Code 1.128
• Agent Skills for .NET Is Now Released | Microsoft Agent Framework
• Don’t rewrite your CLI for agents – Microsoft for Developers

Videos

• Blazor Community Standup: WebMCP in Action with Blazor

Blogs

• Mathias Brandewinder: Drawing mountains: shadows
• Urs Enzler: Event Sourcing — Set-and-Remove-Based Bi-Temporal Events (Part 12)
• Faisal Waris: Optimizing a speech-to-speech model by porting it to ONNX

🚀 Fable 5.7.0 is officially live! 🎉This release brings massive performance upgrades under the hood for Python:- DU pattern matching: 6-10x speed up! 🏎️ – Sequences: 1.6x faster!#fsharp #fablecompiler

— Maxime (@mangelmaxime.bsky.social) 2026-07-10T15:16:58.880Z

Highlighted projects

• Neftedollar/FsLangMCP — MCP server that gives AI coding agents (Claude Code, Cursor, Copilot) real FCS/FSAC compiler intelligence for F#
• TheFellow/fkyeah — F# pipeline engine for multi-stage AI workflows and LLM orchestration
• tonyx/Sharpino — A little F# event-sourcing library.
• fwaris/Chroma_ONNX — FlashLabs Chroma to ONNX plus F# This workspace converts FlashLabs/Chroma-4B to ONNX and runs it from F# with ONNX Runtime.

New Releases

• Pulsar.Client 3.17.0
• Fable 5.7.0
• Mibo 2.0.0
• FsLexYacc 11.4.0
• FsLexYacc.Runtime 11.4.0
• Feliz.Recharts 5.1.1
• FsSpreadsheet 7.0.0
• FSharp.Idioms 1.5.11
• FSharp.Azure.Quantum 1.4.6
• Fun.OData.Query 3.1.0
• Songhay.Modules.Publications 10.0.0
• HtmlTypeProvider 0.9.0
• Sharpino.Templates 1.6.0
• ProcessKit 2.4.0
• FunStripe.Core 2.2.0
• Orleans.FSharp.Runtime 3.0.1
• TestPrune 5.0.0
• Fuuga 1.0.14
• Hegel 0.1.4

Mibo 2.0.0 has been released!Write your Indie Games in F# whether it is Turn Based, Platformer, FPS, RPG, 2D, 3D, Low poly etc…Target Raylib or MonoGame or even Headless to power your game server.#dotnet #fsharp #gamedev #monogame #raylib

— Angel Munoz (@tunaxor.me) 2026-07-09T00:55:00.767Z

That’s all for now. Have a great week.

If you want to help keep F# Weekly going, click here to jazz me with Coffee!