csharp-expert SKILL.md skillA
csharp-expert 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/csharp-expert@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/csharp-expert/SKILL.md- Versions recorded
- 2
- Latest version
- git:20261104.9837da6, committed Nov 4, 2026
- First version recorded
- Oct 8, 2026
- Size
- 22,194 bytes
- Repository stars
- 5,836
- License
- MIT
Route C# and .NET requests to the exact installed specialist or smallest dotnet/skills marketplace plugin. USE FOR: "which specialist should own this" or "how do I add the skill" requests involving ASP.NET Core endpoints, Blazor, MAUI binding, Windows Forms specialist selection or installation, EF Core queries, test framework migration (NUnit, xUnit, MSTest), framework migration, runtime CPU/allocation evidence, file-based C#, editor/compiler defects, a surviving MSBuild `.binlog`, or a plugin…
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
# C# Expert ## Purpose Act as the front door for C# and .NET work. Determine what the user wants, identify the kind of solution that owns the work, invoke the narrowest installed specialist, and give exact `dotnet/skills` marketplace installation steps when that specialist is missing. Keep direct C# language guidance as the fallback, not the default. ## Routing Contract 1. Classify the requested outcome from the prompt. 2. Inspect the smallest set of repository files needed to identify the solution type. 3. Compare both signals with the descriptions of the skills currently available to the runtime. 4. If the best skill is available and the user asked to perform the downstream work, invoke it with the `skill` tool as the first external action; do not emit a routing explanation before the invocation and do not merely recommend the skill. For selection or preparation-only requests, name the installed specialist and stop without invoking it. 5. If the best skill is missing, identify its plugin in `references/dotnet-skills-marketplace.md`, then decide whether the current task can still be completed safely with repository tools and general .NET knowledge. …
Read the whole file at its exact version.
How to install
mdr add dotnet/skills/csharp-expert@sha256:9ed04dc09f4eb894The 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_nl7c6id5nulx7xvu)
2 badge image fetches in 30 days. What the badge shows.
Versions
The registry has recorded 2 versions of this file, between Oct 8, 2026 and Nov 4, 2026, about one every 26 days.
| version | committed | commit | size | audit | |
|---|---|---|---|---|---|
| git:20261104.9837da6 latest | 2026-11-04 | 9837da6 | 22,194 B | A | view · diff |
| git:20261008.3d38ac3 | 2026-10-08 | 3d38ac3 | 21,783 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 (22194 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_nl7c6id5nulx7xvu GET https://markdownregistry.com/api/v1/resolve?ref=dotnet/skills/csharp-expert GET https://markdownregistry.com/api/v1/blob/9ed04dc09f4eb894879cd568b0661d17da379c944e841d636eff48119a262ce9
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.