SDD Observatory

Akka.NET

The canonical actor-model implementation for .NET — a major, long-running OSS project routing its modernization work through OpenSpec change folders.

GitHub · akkadotnet/akka.net using OpenSpec

Stars
5.1K
Contributors
307
Open issues
435
Age
13 years
Last push
3 hours ago
Latest release
1.5.70 Jul 3, 2026
Week of Jul 19, 2025: 0 commits Week of Jul 26, 2025: 3 commits Week of Aug 2, 2025: 1 commit Week of Aug 9, 2025: 20 commits Week of Aug 16, 2025: 5 commits Week of Aug 23, 2025: 4 commits Week of Aug 30, 2025: 9 commits Week of Sep 6, 2025: 3 commits Week of Sep 13, 2025: 8 commits Week of Sep 20, 2025: 2 commits Week of Sep 27, 2025: 18 commits Week of Oct 4, 2025: 25 commits Week of Oct 11, 2025: 4 commits Week of Oct 18, 2025: 5 commits Week of Oct 25, 2025: 0 commits Week of Nov 1, 2025: 1 commit Week of Nov 8, 2025: 0 commits Week of Nov 15, 2025: 1 commit Week of Nov 22, 2025: 7 commits Week of Nov 29, 2025: 3 commits Week of Dec 6, 2025: 1 commit Week of Dec 13, 2025: 6 commits Week of Dec 20, 2025: 5 commits Week of Dec 27, 2025: 3 commits Week of Jan 3, 2026: 3 commits Week of Jan 10, 2026: 6 commits Week of Jan 17, 2026: 18 commits Week of Jan 24, 2026: 15 commits Week of Jan 31, 2026: 0 commits Week of Feb 7, 2026: 1 commit Week of Feb 14, 2026: 1 commit Week of Feb 21, 2026: 11 commits Week of Feb 28, 2026: 13 commits Week of Mar 7, 2026: 14 commits Week of Mar 14, 2026: 14 commits Week of Mar 21, 2026: 4 commits Week of Mar 28, 2026: 2 commits Week of Apr 4, 2026: 7 commits Week of Apr 11, 2026: 1 commit Week of Apr 18, 2026: 22 commits Week of Apr 25, 2026: 4 commits Week of May 2, 2026: 4 commits Week of May 9, 2026: 3 commits Week of May 16, 2026: 1 commit Week of May 23, 2026: 3 commits Week of May 30, 2026: 6 commits Week of Jun 6, 2026: 13 commits Week of Jun 13, 2026: 4 commits Week of Jun 20, 2026: 5 commits Week of Jun 27, 2026: 13 commits Week of Jul 4, 2026: 39 commits Week of Jul 11, 2026: 32 commits
Commits per week, last 12 months · 393 total

Metrics updated Jul 18, 2026 · collected automatically from the GitHub API

Spec structure

Location
openspec/
Formats
Markdown
Notes
changes/ holds around eight active change folders (e.g. artery-tcp-remoting, modernize-akka-io-tcp, internal-serializers-messagepack-v2) plus an archive, an IMPLEMENTATION_ORDER.md, and a milestone-runner automation file.

Assessment drift: none

Spec-to-code drift

None observed so far — spec commits land through normal PR review on the same days as code, and proposals were still flowing on the day of our first assessment. The caveat is that adoption is only about two months old, so there has been little time for drift to accumulate; this is the project to watch for how SDD holds up in a large, old codebase.

Defects and rework

Not yet assessed. Akka.NET’s mature issue and release discipline should make defect trends measurable in a future review, including whether spec-driven changes regress less than pre-adoption changes.

Maintenance outcomes

Too early to judge — but this is the most significant independent adoption we track: a 5k-star, decade-old distributed-systems library using OpenSpec for genuinely hard work (remoting and serialization modernization) rather than a greenfield demo.

Timeline

  1. Latest spec proposal merged

    OpenSpec: propose internal-serializers-messagepack-v2 (#8402)

  2. OpenSpec adopted

    First commit to the openspec/ directory.

Metrics updated Jul 18, 2026 · Assessment last reviewed Jul 18, 2026 · Added Jul 18, 2026 · How we track