dotnet/skills · plugins/dotnet-upgrade/skills/migrate-dotnet8-to-dotnet9/SKILL.md

migrate-dotnet8-to-dotnet9 skillA

migrate-dotnet8-to-dotnet9 is agent-read markdown (skill) from dotnet/skills: Migrate a .NET 8 project to .NET 9 and resolve all breaking changes. USE FOR: upgrading TargetFramework from net8.0 to net9.0, fixing build errors after updating the .NET 9 SDK, resolving behavioral changes in .NET 9 / C# 13 / ASP.NET Core 9 / EF Core 9, replacing BinaryFormatter (now always throws), resolving SYSLIB0054-SYSLIB0057, adapting to params span overload resolution, fixing C# 13 compiler changes, updating HttpClientFactory for SocketsHttpHandler, and resolving EF Core 9 migration/Cosm.

Indexed from public GitHub and served as immutable, content-addressed versions. Install it pinned to an exact SHA-256 with the mdr CLI, and every file is verified against the hash recorded here before it reaches your agent. The deterministic audit below grades the latest version, and the same file always earns the same grade.

How to install

Latest version
mdr add dotnet/skills/migrate-dotnet8-to-dotnet9@git:20260421.05aeb65
Exact content
mdr add dotnet/skills/migrate-dotnet8-to-dotnet9@sha256:95d6de4776ccd6b8

Pin to a label to follow the author's releases, or to a sha256 to freeze the exact bytes forever. Either way the resolved hash is written to mdr.lock, and mdr install reproduces it on any machine.

Badge

mdr badge

[![mdr](https://markdownregistry.com/badge/art_6llo4kec4tzhm6j3.svg)](https://markdownregistry.com/a/art_6llo4kec4tzhm6j3)

0 badge views in 30 days

Versions

versioncommittedcommitsizeaudit
git:20260421.05aeb65 latest2026-04-21 05aeb65 15,769 BA view · diff
git:20260311.e9370fe2026-03-11 e9370fe 15,756 BA view

Audit of the latest version

A  17 of 17 checks passed. Deterministic, no model, same answer every run.
  • pass: Frontmatter block present
  • pass: Frontmatter declares a name
  • pass: Frontmatter declares a description
  • pass: Size between 200 bytes and 200 KB (15769 bytes)
  • pass: No zero-width or bidi control characters
  • pass: No instruction hidden inside an HTML comment
  • pass: No link to an exfiltration or paste host
  • pass: No credential-shaped string
  • pass: No instruction to send local credentials anywhere
  • pass: No text hidden with inline styles
  • pass: No prompt-injection phrasing
  • pass: No curl or wget piped into a shell
  • pass: No recursive delete of root, home or parent
  • pass: No instruction to read or print local credentials
  • pass: No base64 blob over 200 characters
  • pass: No link to a raw IP address
  • pass: No script tag

Source

GitHub

dotnet/skills · 5,437 stars · license MIT · pushed 2026-09-17 · branch main

API

GET https://markdownregistry.com/api/v1/artifacts/art_6llo4kec4tzhm6j3
GET https://markdownregistry.com/api/v1/resolve?ref=dotnet/skills/migrate-dotnet8-to-dotnet9
GET https://markdownregistry.com/api/v1/blob/95d6de4776ccd6b8a71bf1ce776eb3cd8ddb67b590ce1ca66db4785a2d91d9a8

Agents talk at modelranch.com: hand yours the instructions there and it joins the network that reads files like this one.