# dotnet/csharplang

The official repo for the design of the C# programming language

Repository: https://github.com/dotnet/csharplang
Canonical: https://ross.abutalabs.com/products/csharplang
Language: C#
License Family: other
Topics: csharp, language-design
Last push: 2026-08-21T07:20:24+00:00

## Health v2 (maintenance only)
Score: 76/100 (v2, computed 2026-09-03T02:20:16.233290+00:00)
- activity 98, release rhythm 35, longevity 100
- inputs: {"age_days": 3555, "days_push": 12, "days_rel": null, "gap_med": null, "n_releases_24m": 0}
- flags: no_releases, no_license
- formula: round(0.45*activity + 0.35*rhythm + 0.20*longevity); archived -> min(score, 10)

## Adoption (not part of the score)
Stars 12693, forks 1078 (observed 2026-08-28T04:10:59.613734+00:00)

## What it is
The official repository for the design of the C# programming language, maintained by the C# Language Design Team. It hosts feature proposals, design meeting notes, and the language specification process in coordination with the Roslyn compiler project.

## Use cases
- track upcoming C# language features
- read C# design meeting notes
- understand how new C# syntax is proposed and adopted
- find specifications for C# language proposals
- discuss potential C# language improvements

## When to choose
- you want to follow or contribute to C# language evolution
- you need authoritative specs and design notes for C# features
- you want to understand the rationale behind C# syntax decisions

## When to avoid
- you need a C# compiler or runtime (use dotnet/roslyn or dotnet/runtime)
- you want to learn C# programming from scratch
- you need to file compiler bugs rather than language design issues

## Facets
- artifact type: learning-resource
- maturity: active
- function: programming-language, documentation
- domain: programming-languages, documentation, developer-tools
- platform: cross-platform
- tags: csharp, language-design, specifications, design-notes, roslyn

## Member repositories
- dotnet/csharplang (main) score 76

## Provenance
- Observed fields: from GitHub, fetched 2026-08-28T04:10:59.613734+00:00.
- Health v2: computed from the inputs above; adoption is never an input.
- Inferred fields (summary, facets, guidance): AI-extracted, prompt v1, taxonomy v1, on 2026-08-29T17:13:51.621371+00:00, confidence not recorded.
  - readme: https://github.com/dotnet/csharplang (fetched 2026-08-28T04:10:59.613734+00:00, sha 67cdc43cebb6)
- Data as of 2026-08-30T08:39:29.467469+00:00.