dotnet-breaking-changes SKILL.md skillA
dotnet-breaking-changes from dotnet/skills is an agent skill: a SKILL.md folder an AI agent loads when a task calls for it.
mdr add dotnet/skills/dotnet-breaking-changes@git:20261104.9837da6Pins git:20261104.9837da6 in mdr.lock. Pin the fingerprint instead.
- Audit grade
- A, 17 of 17 checks passed
- Kind
- SKILL.md skill
- Repository
- dotnet/skills
- Path
plugins/dotnet/skills/dotnet-breaking-changes/SKILL.md- Versions recorded
- 1
- Latest version
- git:20261104.9837da6, committed Nov 4, 2026
- Size
- 15,048 bytes
- Repository stars
- 5,836
- License
- MIT
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…
Collected from public GitHub. Every version is saved exactly as it was and never changes. Install it at an exact version with the mdr tool, and every file is checked before it reaches your agent. The main file is checked against the SHA-256 fingerprint recorded here, and the others against the fingerprints GitHub keeps for its source commit. The automatic checks below grade the latest version, and the same checks always give the same file the same grade.
What the file says
# .NET breaking changes: the contract is wider than the file When you edit .NET code, the observable contract is usually **larger than the snippet in front of you**. A change that compiles and keeps tests green can still break a downstream consumer, another target framework, a friend assembly, or regenerate away on the next build. This applies to a feature or a bug fix as much as a refactor, and to **additions** — a new public member, overload, or target framework — as much as removals: added surface is a permanent contract obligation, and added behavior on a multi-targeted or partial type must stay correct on every target and survive the next regeneration. (For the behavior-preserving refactoring *process*, use the `csharp-refactoring` skill; this skill is the compatibility knowledge it — and any other change — taps into.) ## Inspect first — find which surfaces this repo actually has The most valuable move is to **look before you leap**: find which hidden surfaces exist here, then check only those. Don't recite these or assume — the markers present dictate the plan; markers absent tell you a surface is not in play. ```bash …
Read the whole file at its exact version.
How to install
mdr add dotnet/skills/dotnet-breaking-changes@sha256:2dccf8ab440b6208The line at the top of this page pins the label git:20261104.9837da6, which is what most people want. This one pins the sha256 fingerprint of the contents instead, so it survives a label being moved. Either way the exact version is written to mdr.lock, and mdr install downloads and checks those contents again, so it installs them exactly or stops with an error.
[](https://markdownregistry.com/a/art_z2b2mwsrya4dkeng)
1 badge image fetches in 30 days. What the badge shows.
Versions
The registry has recorded 1 version of this file, committed on Nov 4, 2026.
Audit of the latest version
- pass: Frontmatter block present
- pass: Frontmatter declares a name
- pass: Frontmatter declares a description
- pass: Size between 200 bytes and 200 KB (15048 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
dotnet/skills · 5,836 stars · license MIT · pushed 2026-11-06 · branch main
API
GET https://markdownregistry.com/api/v1/artifacts/art_z2b2mwsrya4dkeng GET https://markdownregistry.com/api/v1/resolve?ref=dotnet/skills/dotnet-breaking-changes GET https://markdownregistry.com/api/v1/blob/2dccf8ab440b6208557f0391bae7ac30cb5db9fcdd9c966e49541965eccdd2da
Your AI assistant does the legwork. You hear about the deals worth your word. Hand yours the standing instructions at modelranch.com and it joins the network that reads files like this one.
Guides: the SKILL.md format and its required fields · what to check before you install a skill · how to pin a skill to an exact version · where to find agent skills · keeping a team on the same skills · which agent file does what.