Public record
Software health reportschema 0.34.0 · metrics 2.10.0 · 2026-09-18 15:25 UTC

CosmosOS / Cosmos

Cosmos is an operating system "construction kit". Build your own OS using managed languages such as C#, VB.NET, and more!

C#BSD-3-Clause★ 3,200 stars⑂ 584 forkssince Dec 2014View on GitHub ↗
KindLibraryPluginhow this is determined

CosmosOS/Cosmos holds a health index of 87 out of 100, placing it in the Excellent band. It scores highest on Vitality (89/100) and lowest on Security (49/100). It was last updated today. A single contributor accounts for most of its recent work.

87
overall / 100
Excellent

Software health index

Metrics are grouped into weighted categories on one standardized 1–100 scale. Overall starts as their weighted mean, calibrated against the distribution of the public record so bands carry percentile meaning; when public evidence triggers the High-Risk Jurisdiction Policy, the rating is adjusted and receives an At Risk ceiling of 34.

87
Exceptional93-100The record's top tier (≈ top 5%); essentially all checked criteria met
Excellent80-92Strong across the board; minor gaps
Good65-79Healthy; gaps are limited and manageable
Moderate50-64Acceptable with notable gaps; review recommended
Weak35-49Material weaknesses across several areas
At Risk20-34Significant weaknesses; adoption warrants caution
Critical1-19Severe problems (abandoned, single-maintainer, no hygiene)
VitalityCommunity &AdoptionSustainability &GovernanceEngineeringQualitySecurityAI Readiness

Score profile

Each axis is a category. The shape matters more than the average — a healthy subject fills the whole shape, while a spike-and-crater profile means strength in one dimension is masking risk in another.

The weighted overall 73 is calibrated to 87 on the published index scale (record calibration 2026-08-02).

Ownership

CosmosOSOrganization
167 followers11 public repossince Dec 2014

This repository is backed by an organization — shared, accountable stewardship that can outlive any single maintainer.

Package ecosystems

Metrics by category

Vitality

Is the project alive — is code being written and are releases shipping?

89Excellent · 21% of overall
How it's scored
36/36Push recencylast push 0 days ago
33.2/36Commit cadence48/52 weeks with commits
18/18Commit volume1,875 commits in the last year
10/10OpenSSF Scorecard: Maintained30 commit(s) and 16 issue activity found in the last 90 days -- score normalized to 10
Inputs used
commits_last_year1,875
human_commit_share1
days_since_last_push0
active_weeks_last_year48
How it's scored
27/27Ships releases15 releases published
36/36Release recencylatest release 0 days ago
12.6/27Release cadencea release every ~322 days
0/10OpenSSF Scorecard: Signed-ReleasesProject has not signed or included provenance with any releases.
Inputs used
releases_count15
latest_release_tagv3.0.86
releases_from_tagsno
days_since_latest_release0
mean_days_between_releases322

Community & Adoption

Does the project have users, downloads, attention, and a welcoming setup for contributors?

77Good · 17% of overall
How it's scored
56.9/60Stars3,200 stars
23.1/25Forks584 forks
12.3/15Watchers167 watchers
Inputs used
forks584
stars3,200
watchers167
growth_stateunverified
growth_factor_pct100
growth_unverified_reasonno_history
How it's scored
22.5/22.5README
22.5/22.5Licenserecognized license (BSD-3-Clause)
18/18CONTRIBUTING guide
0/13.5Code of conduct
0/7.2Issue template
0/6.3PR template
Inputs used
has_readmeyes
has_licenseyes
readme_badges5
has_contributingyes
has_issue_templateno
has_code_of_conductno
readme_badge_servicesshields.io
has_pull_request_templateno
How it's scored
51.4/80Total downloads88,536 downloads all-time across nuget
0/20Registry dependentsnot reported by this ecosystem
Inputs used
packagesCosmos.Kernel.HAL, Cosmos.Kernel.Core, Cosmos.Kernel.HAL.X64, Cosmos.Build.Templates, Cosmos.Kernel.Core.X64, Cosmos.Kernel.HAL.ARM64, Cosmos.Kernel.Core.ARM64, Cosmos.Kernel.Boot.Limine
dependents
ecosystemsnuget
total_downloads88,536
monthly_downloads
unverified_packages_excluded
Excluded from scoring (no data or not applicable): Registry dependents. Remaining weights renormalized.

Sustainability & Governance

Will the project survive its people — bus factor, responsiveness, who backs it, and package upkeep?

64Moderate · 23% of overall
How it's scored
9/54Bus factor1 contributor(s) cover half of all commits
4.6/22.5Commit distributiontop contributor authored 79% of commits
13.5/13.5Contributor breadth13 contributors
10/10OpenSSF Scorecard: Contributorsproject has 15 contributing companies or organizations
Inputs used
bus_factor1
contributors_sampled13
top_contributor_share0.794
How it's scored
42/42Issue resolution100% of issues closed
22/30PR acceptance702/956 decided PRs merged
0/13Newcomer PR acceptance0/4 first-time contributors' PRs merged in 30d
0/15OpenSSF Scorecard: Code-ReviewFound 0/30 approved changesets -- score normalized to 0
Inputs used
merged_prs702
open_issues2
closed_issues1,937
prs_merged_7d0
prs_decided_7d12
prs_merged_30d0
prs_decided_30d13
issue_closed_ratio0.999
closed_unmerged_prs254
first_time_authors_30d4
first_time_prs_merged_30d0
first_time_prs_decided_30d4
How it's scored
30/30Ownership backingorganization-owned
0/20Verified domain
16/25Owner reach167 followers of CosmosOS
19.9/25Track record11 public repos, account ~11 yr old
Inputs used
followers167
owner_typeOrganization
is_verifiedno
owner_loginCosmosOS
public_repos11
account_age_days4,306

Package maintenance

100Exceptional
How it's scored
25/25Published & resolvable8 package(s) on nuget
35/35Publish recencylatest publish 0 days ago
20/20Version history80 published versions
20/20Not deprecatedactive, not deprecated or yanked
Inputs used
packagesCosmos.Kernel.HAL, Cosmos.Kernel.Core, Cosmos.Kernel.HAL.X64, Cosmos.Build.Templates, Cosmos.Kernel.Core.X64, Cosmos.Kernel.HAL.ARM64, Cosmos.Kernel.Core.ARM64, Cosmos.Kernel.Boot.Limine
ecosystemsnuget
any_deprecatedno
min_days_since_publish0

Engineering Quality

Are baseline engineering and documentation practices in place?

81Excellent · 19% of overall
How it's scored
24/24CI workflows11 workflow(s)
24/24Tests present
0/16Linter config
0/9.6Pre-commit hooks
6.4/6.4.editorconfig
0/20OpenSSF Scorecard: CI-Testsno data
Inputs used
has_ciyes
has_testsyes
has_editorconfigyes
has_linter_configno
has_precommit_configno
Excluded from scoring (no data or not applicable): OpenSSF Scorecard: CI-Tests. Remaining weights renormalized.

Documentation

100Exceptional
How it's scored
30/30README
25/25Documentation directory
15/15Documentation / homepage sitehttps://www.goCosmos.org
10/10Repository description
10/10Topics1 topics
10/10Wiki
Inputs used
topicshacktoberfest
has_wikiyes
homepagehttps://www.goCosmos.org
docs_sitehttps://www.goCosmos.org
has_readmeyes
has_docs_diryes
has_descriptionyes

Security

Are visible security and supply-chain practices strong, without unresolved high-risk jurisdiction exposure?

49Weak · 16% of overall
How it's scored
7.5/7.5Binary-Artifactsno binaries found in the repo
0/7.5Branch-Protectionbranch protection not enabled on development/release branches
0/2.5CI-Testsno data
0/2.5CII-Best-Practicesno effort to earn an OpenSSF best practices badge detected
0/7.5Code-ReviewFound 0/30 approved changesets -- score normalized to 0
2.5/2.5Contributorsproject has 15 contributing companies or organizations
10/10Dangerous-Workflowno dangerous workflow patterns detected
7.5/7.5Dependency-Update-Toolupdate tool detected
0/5Fuzzingproject is not fuzzed
2.5/2.5Licenselicense file detected
7.5/7.5Maintained30 commit(s) and 16 issue activity found in the last 90 days -- score normalized to 10
5/5Packagingpackaging workflow detected
0/5Pinned-Dependenciesdependency not pinned by hash detected -- score normalized to 0
0/5SASTno SAST tool detected
0/5Security-Policysecurity policy file not detected
0/7.5Signed-ReleasesProject has not signed or included provenance with any releases.
0/7.5Token-Permissionsdetected GitHub workflow tokens with excessive permissions
7.5/7.5Vulnerabilities0 existing vulnerabilities detected
Inputs used
sourceopenssf_scorecard
checks_evaluated17
scorecard_versionv5.5.0
checks_inconclusive1
scorecard_aggregate4.9
Excluded from scoring (no data or not applicable): CI-Tests. Remaining weights renormalized.

AI Readiness

How well is the repo equipped to be developed and maintained with AI coding agents? Carries a deliberately small weight (4%): agent tooling is a real maintenance signal, but a repository with none can still reach 100/100.

82Excellent · 4% of overall
How it's scored
45/45Agent instructions.taskmaster/CLAUDE.md, CLAUDE.md
0/15Machine-readable docs (llms.txt)
40/40Legible commit history79 of 100 human commits state their intent (structured subject or explanatory body)
Inputs used
has_llms_txtno
llms_txt_url
legible_history_share0.79
agent_instruction_files.taskmaster/CLAUDE.md, CLAUDE.md
agent_instruction_max_bytes13,794
How it's scored
18/18One-command bootstrapMakefile
22/22Automated tests
0/11Lint / format config
11/11Static type checkingC# (statically typed)
10/10Reproducible environmentdevcontainer, Dockerfile
0/10Demonstrated agent practiceno agent-authored commits among the last 100
5/8Automated maintenancedependency automation configured, none observed in the sampled commits
0/10OpenSSF Scorecard: Pinned-Dependenciesdependency not pinned by hash detected -- score normalized to 0
Inputs used
has_nixno
has_testsyes
lockfiles
has_dockerfileyes
typed_languageyes
bootstrap_filesMakefile
has_devcontaineryes
has_linter_configno
typecheck_configs
agent_commit_share0
toolchain_manifestsexamples/DevKernel/DevKernel.csproj, src/Cosmos.Build.API/Cosmos.Build.API.csproj, src/Cosmos.Build.Analyzer.Patcher.CodeFixes/Cosmos.Build.Analyzer.Patcher.CodeFixes.csproj, src/Cosmos.Build.Analyzer.Patcher.Package/Cosmos.Build.Analyzer.Patcher.Package.csproj, src/Cosmos.Build.Analyzer.Patcher/Cosmos.Build.Analyzer.Patcher.csproj, src/Cosmos.Build.Asm/Cosmos.Build.Asm.csproj, src/Cosmos.Build.CC/Cosmos.Build.CC.csproj, src/Cosmos.Build.Common/Cosmos.Build.Common.csproj, src/Cosmos.Build.Ilc/Cosmos.Build.Ilc.csproj, src/Cosmos.Build.Patcher/Cosmos.Build.Patcher.csproj, src/Cosmos.Build.Templates/Cosmos.Build.Templates.csproj, src/Cosmos.Build.Templates/templates/cosmos-kernel/KernelName.csproj, src/Cosmos.Kernel.Boot.Limine/Cosmos.Kernel.Boot.Limine.csproj, src/Cosmos.Kernel.Core.ARM64/Cosmos.Kernel.Core.ARM64.csproj, src/Cosmos.Kernel.Core.X64/Cosmos.Kernel.Core.X64.csproj, src/Cosmos.Kernel.Core/Cosmos.Kernel.Core.csproj, src/Cosmos.Kernel.Debug/Cosmos.Kernel.Debug.csproj, src/Cosmos.Kernel.HAL.ARM64/Cosmos.Kernel.HAL.ARM64.csproj, src/Cosmos.Kernel.HAL.Interfaces/Cosmos.Kernel.HAL.Interfaces.csproj, src/Cosmos.Kernel.HAL.X64/Cosmos.Kernel.HAL.X64.csproj, src/Cosmos.Kernel.HAL/Cosmos.Kernel.HAL.csproj, src/Cosmos.Kernel.Native.ARM64/Cosmos.Kernel.Native.ARM64.csproj, src/Cosmos.Kernel.Native.MultiArch/Cosmos.Kernel.Native.MultiArch.csproj, src/Cosmos.Kernel.Native.X64/Cosmos.Kernel.Native.X64.csproj, src/Cosmos.Kernel.Plugs/Cosmos.Kernel.Plugs.csproj, src/Cosmos.Kernel.SourceGenerators/Cosmos.Kernel.SourceGenerators.csproj, src/Cosmos.Kernel.System/Cosmos.Kernel.System.csproj, src/Cosmos.Kernel/Cosmos.Kernel.csproj, src/Cosmos.Patcher/Cosmos.Patcher.csproj, src/Cosmos.Sdk/Cosmos.Sdk.csproj, src/Cosmos.Tools/Cosmos.Tools.csproj, src/tests/Cosmos.Kernel.Tests.System/Cosmos.Kernel.Tests.System.csproj, tests/Cosmos.TestRunner.Engine/Cosmos.TestRunner.Engine.csproj, tests/Cosmos.TestRunner.Framework/Cosmos.TestRunner.Framework.csproj, tests/Cosmos.TestRunner.Protocol/Cosmos.TestRunner.Protocol.csproj, tests/Cosmos.Tests.Build.Analyzer.Patcher/Cosmos.Tests.Build.Analyzer.Patcher.csproj, tests/Cosmos.Tests.Build.Asm/Cosmos.Tests.Build.Asm.csproj, tests/Cosmos.Tests.BuildCache/Cosmos.Tests.BuildCache.csproj, tests/Cosmos.Tests.NativeWrapper/Cosmos.Tests.NativeWrapper.csproj, tests/Cosmos.Tests.Patcher/Cosmos.Tests.Patcher.csproj, tests/Cosmos.Tests.Scanner/Cosmos.Tests.Scanner.csproj, tests/Cosmos.Tests.Tools/Cosmos.Tests.Tools.csproj, tests/Kernels/Cosmos.Kernel.Tests.Fat/Cosmos.Kernel.Tests.Fat.csproj, tests/Kernels/Cosmos.Kernel.Tests.File/Cosmos.Kernel.Tests.File.csproj, tests/Kernels/Cosmos.Kernel.Tests.GarbageCollector/Cosmos.Kernel.Tests.GarbageCollector.csproj, tests/Kernels/Cosmos.Kernel.Tests.Graphic/Cosmos.Kernel.Tests.Graphic.csproj, tests/Kernels/Cosmos.Kernel.Tests.HelloWorld/Cosmos.Kernel.Tests.HelloWorld.csproj, tests/Kernels/Cosmos.Kernel.Tests.Interrupts/Cosmos.Kernel.Tests.Interrupts.csproj, tests/Kernels/Cosmos.Kernel.Tests.Math/Cosmos.Kernel.Tests.Math.csproj, tests/Kernels/Cosmos.Kernel.Tests.Memory/Cosmos.Kernel.Tests.Memory.csproj, tests/Kernels/Cosmos.Kernel.Tests.Network/Cosmos.Kernel.Tests.Network.csproj, tests/Kernels/Cosmos.Kernel.Tests.Pci/Cosmos.Kernel.Tests.Pci.csproj, tests/Kernels/Cosmos.Kernel.Tests.Power/Cosmos.Kernel.Tests.Power.csproj, tests/Kernels/Cosmos.Kernel.Tests.Runtime/Cosmos.Kernel.Tests.Runtime.csproj, tests/Kernels/Cosmos.Kernel.Tests.Storage/Cosmos.Kernel.Tests.Storage.csproj, tests/Kernels/Cosmos.Kernel.Tests.Threading/Cosmos.Kernel.Tests.Threading.csproj, tests/Kernels/Cosmos.Kernel.Tests.Timer/Cosmos.Kernel.Tests.Timer.csproj, tests/Kernels/Cosmos.Kernel.Tests.TypeCasting/Cosmos.Kernel.Tests.TypeCasting.csproj, tests/Kernels/Cosmos.Kernel.Tests.Virtio/Cosmos.Kernel.Tests.Virtio.csproj
dependency_bot_commit_share0
How it's scored
45/45Type-checkable codeC# (statically typed)
54.4/55Manageable file sizes8/704 source files over 60KB
Inputs used
primary_languageC#
largest_source_bytes264,013
source_files_sampled704
oversized_source_files8
How it's scored
0/40API schema (OpenAPI/GraphQL/proto)not applicable to this kind of software
20/20MCP server
40/40Runnable examplesexamples
Inputs used
example_dirsexamples
has_mcp_signalyes
api_schema_files
interfaces_expected_of
Excluded from scoring (no data or not applicable): API schema (OpenAPI/GraphQL/proto). Remaining weights renormalized.

Key facts

3,200GitHub stars
13contributors
1,875commits, last 12 months
0days since last push
15releases
1bus factor
2open issues
package ecosystems

Data collection warnings

  • Star history unavailable: GitHub GraphQL error: Resource not accessible by personal access token
  • No resolved dependencies carried a version and a supported ecosystem

More detail

Star and fork history 0 ★ / 584 ⇿
0Stars
584Forks
13Releases

When each star and fork was added, collected from GitHub and bucketed by day. Cumulative growth sits directly above the daily additions it is made of, so the two read against each other: steady organic accretion looks nothing like an abrupt, short-lived burst. Where that difference is measurable, it is reported as growth authenticity.

0100200300400500600581142014-122020-102026-09
Major 0Minor 0Patch 0

Each point covers 11 days.

OpenSSF Scorecard 4.9 / 10
4.9aggregate

Independent, tool-agnostic security assessment from the open-source OpenSSF Scorecard. Each check rewards a security practice, not a specific vendor's tool. Checks Scorecard could not determine are marked n/a and excluded from the security score (never counted as zero).Scorecard v5.5.0 · 2026-09-18 15:24 UTC

10Binary-Artifactsno binaries found in the repo
0Branch-Protectionbranch protection not enabled on development/release branches
n/aCI-Testsno pull request found
0CII-Best-Practicesno effort to earn an OpenSSF best practices badge detected
0Code-ReviewFound 0/30 approved changesets -- score normalized to 0
10Contributorsproject has 15 contributing companies or organizations
10Dangerous-Workflowno dangerous workflow patterns detected
10Dependency-Update-Toolupdate tool detected
0Fuzzingproject is not fuzzed
10Licenselicense file detected
10Maintained30 commit(s) and 16 issue activity found in the last 90 days -- score normalized to 10
10Packagingpackaging workflow detected
0Pinned-Dependenciesdependency not pinned by hash detected -- score normalized to 0
0SASTno SAST tool detected
0Security-Policysecurity policy file not detected
0Signed-ReleasesProject has not signed or included provenance with any releases.
0Token-Permissionsdetected GitHub workflow tokens with excessive permissions
10Vulnerabilities0 existing vulnerabilities detected
Direct dependencies 15
RegistryPackageVersion constraintManifest
NuGetMicrosoft.CodeAnalysis.CSharp.Workspacessrc/Cosmos.Build.Analyzer.Patcher.CodeFixes/Cosmos.Build.Analyzer.Patcher.CodeFixes.csproj
NuGetMicrosoft.CodeAnalysis.Commonsrc/Cosmos.Build.Analyzer.Patcher.CodeFixes/Cosmos.Build.Analyzer.Patcher.CodeFixes.csproj
NuGetPolySharpsrc/Cosmos.Build.Analyzer.Patcher.CodeFixes/Cosmos.Build.Analyzer.Patcher.CodeFixes.csproj
NuGetMicrosoft.CodeAnalysis.Analyzerssrc/Cosmos.Build.Analyzer.Patcher/Cosmos.Build.Analyzer.Patcher.csproj
NuGetMicrosoft.CodeAnalysis.CSharpsrc/Cosmos.Build.Analyzer.Patcher/Cosmos.Build.Analyzer.Patcher.csproj
NuGetPolySharpsrc/Cosmos.Build.Analyzer.Patcher/Cosmos.Build.Analyzer.Patcher.csproj
NuGetMicrosoft.Build.Utilities.Coresrc/Cosmos.Build.Asm/Cosmos.Build.Asm.csproj
NuGetMicrosoft.Build.Utilities.Coresrc/Cosmos.Build.CC/Cosmos.Build.CC.csproj
NuGetMicrosoft.Build.Utilities.Coresrc/Cosmos.Build.Common/Cosmos.Build.Common.csproj
NuGetPolySharpsrc/Cosmos.Build.Common/Cosmos.Build.Common.csproj
NuGetMono.Cecilsrc/Cosmos.Build.Ilc/Cosmos.Build.Ilc.csproj
NuGetMicrosoft.Build.Utilities.Coresrc/Cosmos.Build.Ilc/Cosmos.Build.Ilc.csproj
NuGetMicrosoft.Build.Utilities.Coresrc/Cosmos.Build.Patcher/Cosmos.Build.Patcher.csproj
NuGetPolySharpsrc/Cosmos.Build.Patcher/Cosmos.Build.Patcher.csproj
NuGetMono.Cecilsrc/Cosmos.Build.Patcher/Cosmos.Build.Patcher.csproj
All dependencies 22

Full resolved dependency set from the GitHub dependency graph: 7 direct and 15 indirect (transitive) packages. The transitive closure is complete when the repository commits a lockfile.

RegistryPackageVersionRelation
NuGetMicrosoft.Build.Utilities.Coredirect
NuGetMicrosoft.CodeAnalysis.Analyzersdirect
NuGetMicrosoft.CodeAnalysis.Commondirect
NuGetMicrosoft.CodeAnalysis.CSharpdirect
NuGetMicrosoft.CodeAnalysis.CSharp.Workspacesdirect
NuGetMono.Cecildirect
NuGetPolySharpdirect
NuGetCosmos.Kernelindirect
NuGetCosmos.Kernel.Systemindirect
NuGetcoverlet.collectorindirect
NuGetMicrosoft.CodeAnalysisindirect
NuGetMicrosoft.CodeAnalysis.CodeFix.Testingindirect
NuGetMicrosoft.CodeAnalysis.CSharp.CodeFix.Testing.XUnitindirect
NuGetMicrosoft.CodeAnalysis.Testing.Verifiers.XUnitindirect
NuGetMicrosoft.NET.Test.Sdkindirect
NuGetMonoMod.Utilsindirect
NuGetMoqindirect
NuGetNUnitindirect
NuGetNUnit3TestAdapterindirect
NuGetSpectre.Console.Cliindirect
NuGetxunitindirect
NuGetxunit.runner.visualstudioindirect
Dependency advisories not assessed

Advisory matching could not run for this report: No resolved dependencies carried a version and a supported ecosystem

Raw JSON report machine-readable

Feedback

Spotted something off in this report, or have thoughts to share? Wrong measurements, missed tooling, ideas, questions — anything is welcome. Every message is read and gets a response.

The message is kept through sign-in.

Scores are signals, not warranties. They reflect publicly visible practices on GitHub — not a code audit, and not a security guarantee.

Missing data is excluded and weights renormalized, never scored as zero. Methodology is versioned and open: metrics v2.10.0, schema v0.34.0 — full methodology · metrics wiki.

How one result sits in the wider record: aggregate statisticsNuGet.