migrate-nullable-references SKILL.md skillA
migrate-nullable-references 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/migrate-nullable-references@git:20260421.05aeb65Pins git:20260421.05aeb65 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-upgrade/skills/migrate-nullable-references/SKILL.md- Versions recorded
- 2
- Latest version
- git:20260421.05aeb65, committed Apr 21, 2026
- First version recorded
- Mar 7, 2026
- Size
- 35,936 bytes
- Repository stars
- 5,836
- License
- MIT
Enable nullable reference types in a C# project and systematically resolve all warnings. USE FOR: adopting NRTs in existing codebases, file-by-file or project-wide migration, fixing CS8602/CS8618/CS86xx warnings, annotating APIs for nullability, cleaning up null-forgiving operators, upgrading dependencies with new nullable annotations. DO NOT USE FOR: projects already fully migrated with zero warnings (unless auditing suppressions), fixing a handful of nullable warnings in code that already…
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
# Nullable Reference Migration Enable C# nullable reference types (NRTs) in an existing codebase and systematically resolve all warnings. The outcome is a project (or solution) with `<Nullable>enable</Nullable>`, zero nullable warnings, and accurately annotated public API surfaces — giving both the compiler and consumers reliable nullability information. ## When to Use - Enabling nullable reference types in an existing C# project or solution - Systematically resolving CS86xx nullable warnings after enabling the feature - Annotating a library's public API surface so consumers get accurate nullability information - Upgrading a dependency that has added nullable annotations and new warnings appear - Analyzing suppressions in a code base that has already enabled NRTs to determine whether they can be removed ## When Not to Use - The project already has `<Nullable>enable</Nullable>` and zero warnings — the migration is done unless the user wants to re-examine suppressions with a view to removing unnecessary ones (see Step 6) - The user only wants to suppress warnings without fixing them (recommend against this) …
Read the whole file at its exact version.
How to install
mdr add dotnet/skills/migrate-nullable-references@sha256:4c229d8b7626a373The line at the top of this page pins the label git:20260421.05aeb65, 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_4bigqmpnyksdqdpr)
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Versions
The registry has recorded 2 versions of this file, between Mar 7, 2026 and Apr 21, 2026, about one every 45 days.
| version | committed | commit | size | audit | |
|---|---|---|---|---|---|
| git:20260421.05aeb65 latest | 2026-04-21 | 05aeb65 | 35,936 B | A | view · diff |
| git:20260307.042a9d2 | 2026-03-07 | 042a9d2 | 35,923 B | A | view |
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 (35936 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_4bigqmpnyksdqdpr GET https://markdownregistry.com/api/v1/resolve?ref=dotnet/skills/migrate-nullable-references GET https://markdownregistry.com/api/v1/blob/4c229d8b7626a3737b2cf26ea89583a90fecf4f1d9136f04377688c75f22879b
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.