plugin

modernize-dotnet — GitHub Copilot plugin: upgrade .NET apps

Q: How do I install modernize-dotnet in GitHub Copilot?

Run `copilot plugin install modernize-dotnet@awesome-copilot`. The agent then shows up in Copilot CLI.

Adds an agent to Copilot CLI that walks your project through assessment, planning and edits when moving to a newer .NET version.

Install into GitHub Copilot · Command from the source All methods and platforms ↓

copilot plugin install modernize-dotnet@awesome-copilot

Open on GitHub

What modernize-dotnet does

The plugin ships the modernize-dotnet agent, which runs an upgrade in stages: it assesses the project and works out what has to change, builds a step-by-step plan, then applies the edits with dedicated tools. A Modernization MCP server provides the analysis and upgrade tools, and it starts on its own when you invoke the agent — no manual setup.

The repo holds the agent file, plugin.json, and hook scripts track-telemetry.ps1 and track-telemetry.sh wired through hooks.json. You need .NET SDK 10.0 or later installed; without it the agent has nothing to run against.

One thing to weigh: modernize-dotnet is marked deprecated. It still works, but new features and fixes go only to upgrade-agent (agent @upgrade), which is where the maintainers point you. Worth checking that replacement before you commit to this one.

What it helps with

find out what has to be rewritten before a .NET version bump
get a step-by-step upgrade plan instead of tracing dependencies by hand
move an app off .NET Framework onto a current .NET release
apply project-wide edits through the agent's tools rather than manually
decide between the deprecated plugin and its replacement

Example prompts for the agent

select the modernize-dotnet agent and upgrade my project to .NET 10
run modernize-dotnet and show me what needs to change in this project
use the modernize-dotnet agent to draft an upgrade plan for my solution

How to install modernize-dotnet

Command from the source

copilot plugin install modernize-dotnet@awesome-copilot

Step by step, with commands for each platform: Claude Code plugins: marketplaces, installing, and building your own

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Questions about modernize-dotnet

How do I install modernize-dotnet in GitHub Copilot?

Run copilot plugin install modernize-dotnet@awesome-copilot. The agent then shows up in Copilot CLI.

What does modernize-dotnet do?

It takes a .NET application through assessment, planning and code changes during an upgrade. You pick it as an agent inside the CLI.

What do I need for the plugin to work?

.NET SDK 10.0 or later. The Modernization MCP server starts automatically when the agent is invoked.