F# Weekly #16, 2026 – .NET 11 Preview 3 & SwaggerProvider 4.0 beta

Welcome to F# Weekly,

A roundup of F# content from this past week:

News

• .NET 11 Preview 3 is now available!
• TypeFighter
• Replace Queue with mutable doubly-linked EventList by nojaf · Pull Request #3331 · fsprojects/fantomas

Microsoft News

• .NET and .NET Framework April 2026 servicing releases updates
• Free Your Terminal with Detached Mode in Aspire 13.2 | Aspire Blog
• New Aspire database integrations | Aspire Blog
• Agent Skills in .NET: Three Ways to Author, One Provider to Run Them | Microsoft Agent Framework
• Azure MCP tools now ship built into Visual Studio 2022 — no extension required – Visual Studio Blog
• Stop Hunting Bugs: Meet the New Visual Studio Debugger Agent Workflow – Visual Studio Blog
• From AI to .NET: 20 VS Live! Las Vegas Sessions You Can Watch Now – Visual Studio Blog
• Visual Studio Code 1.116

Just released SwaggerProvider 4.0.0-beta01 that wrap nullable strings in Option<string>. Try it out and share your feedback! fsprojects.github.io/SwaggerProvi… #fsharp

— Sergey Tihon 🦔🦀 (@sergeytihon.com) 2026-04-16T17:04:11.473Z

Videos

• Functional programming in F# Fad or Fabulous | Ken Bonny
• Blazor Community Standup: Blazor validation in .NET 11

Blogs

• Interview with Jack Fox about porting variant of F#/OCaml/F* to Nock (Urbit’s minimalist instruction set architecture)
• Urs Enzler: Event Sourcing — Simple Is Often Enough
• What if your compiler could enforce your architecture rules? | LinkedIn
• Samir Parikh: Options in F#

Highlighted projects

• pblasucci/ananoid — Ananoid provides nano identifiers, an alternative to UUIDs.
• Neftedollar/fyper — Type-safe Cypher query builder for F# with computation expressions for Neo4j and Apache AGE, zero dependencies
• TheFellow/fkyeah — F# pipeline engine for multi-stage AI workflows and LLM orchestration
• Neftedollar/orleans-fsharp — Idiomatic F# API for Microsoft Orleans using computation expressions, with full Orleans 10.0.1 parity and 800+ tests
• venikman/ACP-inspector — Debug and validate Agent Client Protocol (ACP) traffic for AI coding agents

New Releases

• tree-sitter-fsharp 0.3.0
• FSharp.Data 8.1.8
• FSharp.TypeProviders.Templates 8.6.0
• FSharp.Control.AsyncSeq 4.14.0
• FSharp.Compiler.Service 43.12.202
• Pulsar.Client 3.15.1
• Fable.Remoting.Client 8.0.0
• Fable.Remoting.Server 6.1.0
• Feliz 3.3.0
• FSharp.Control.TaskSeq 1.1.1
• Farmer 1.9.27
• Akkling 0.18.1
• Fantomas.Client 0.11.0
• Fss-lib.Core 3.0.0
• SageFs 0.6.242
• Fidelity.CloudEdge.Management 0.2.0
• StarFederation.Datastar.FSharp 1.3.0

We will remove the Fantomas Discord in favour of a channel on the #fsharp one: discord.com/channels/196…See you there!

— Florian Verdonck (@nojaf.com) 2026-04-14T12:53:31.821Z

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

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