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dotnet-breaking-changes

95 / 100 · Low risk

Fine to try. Some of what it can do is expected: a coding skill usually runs build and test commands.

By microsoft/testfx (GitHub) · coding · 1,059 stars · scanned at commit 8dd78e1

Use before changing .NET/C# code whose callers you do not control: a NuGet library, or a repo with PublicAPI.Shipped/Unshipped.txt, ApiCompat, multiple TargetFrameworks, InternalsVisibleTo, or generated (.g.cs) partials. Green builds miss silent breaks from optional parameters, parameter names, sealing, const values, nullability, and #if. USE FOR: "without breaking existing callers"; adding a public method, overload, optional parameter, or interface member to a shipped library; renaming a publi…

Works with any agent that supports SKILL.md skills.

What this skill can do

Install

Paste this into your terminal. It downloads exactly the version we scanned, not whatever is newest.

if [ -e ~/.agents/skills/'dotnet-breaking-changes' ] || [ -L ~/.agents/skills/'dotnet-breaking-changes' ]; then echo 'A skill folder named dotnet-breaking-changes already exists — not replacing it' >&2; false; else d=$(mktemp -d) && git clone --quiet --filter=blob:none --no-checkout 'https://github.com/microsoft/testfx' "$d" && git -C "$d" checkout --quiet '8dd78e1347417e400c3ef8d786059a8bb346162f' -- '.agents/skills/dotnet-breaking-changes' && mkdir -p ~/.agents/skills && cp -R "$d"/'.agents/skills/dotnet-breaking-changes' ~/.agents/skills/'dotnet-breaking-changes' && rm -rf "$d"; fi

Codex reads ~/.agents/skills directly. For Claude Code, Cursor, Copilot, Gemini CLI, Antigravity or OpenCode, also link it. For Claude Code: ln -s ~/.agents/skills/'dotnet-breaking-changes' ~/.claude/skills/'dotnet-breaking-changes' (other agents: ~/.cursor/skills, ~/.copilot/skills, ~/.gemini/skills, ~/.gemini/config/skills, ~/.config/opencode/skills). Or install through the finder skill, which does both.

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