Public record
Software health reportschema 0.34.0 · metrics 2.10.0 · 2026-08-28 05:02 UTC

ruby-concurrency / concurrent-ruby

Modern concurrency tools including agents, futures, promises, thread pools, supervisors, and more. Inspired by Erlang, Clojure, Scala, Go, Java, JavaScript, and classic concurrency patterns.

Ruby · JavaCustom license★ 5,831 stars⑂ 415 forkssince Jul 2013View on GitHub ↗
KindLibraryhow this is determined
#concurrency#ruby

ruby-concurrency/concurrent-ruby holds a health index of 81 out of 100, placing it in the Excellent band. It scores highest on Community & Adoption (93/100) and lowest on AI Readiness (39/100). It was last updated 39 days ago. 2 contributors account for most of its recent work.

81
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.

81
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 69 is calibrated to 81 on the published index scale (record calibration 2026-08-02).

Ownership

ruby-concurrencyOrganization
14 followers5 public repossince Sep 2013

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

Package ecosystems

RegistryPackageVersionDownloads / moVersionsLast publish
RubyGemsconcurrent-ruby1.3.8-13839 days ago
RubyGemsconcurrent-ruby-extpoints to another repo — not scored1.3.8-14239 days ago
RubyGemsconcurrent-ruby-edgepoints to another repo — not scored0.7.2-27589 days ago

Metrics by category

Vitality

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

66Good · 21% of overall

Development activity

48Weak
How it's scored
18/36Push recency — last push 39 days ago
8.3/36Commit cadence — 12/52 weeks with commits
13.1/18Commit volume — 28 commits in the last year
9/10OpenSSF Scorecard: Maintained — 11 commit(s) and 0 issue activity found in the last 90 days -- score normalized to 9
Inputs used
commits_last_year28
human_commit_share0.92
days_since_last_push39
active_weeks_last_year12

Release discipline

92Excellent
How it's scored
27/27Ships releases — 62 releases published
36/36Release recency — latest release 39 days ago
19.8/27Release cadence — a release every ~86.8 days
0/10OpenSSF Scorecard: Signed-Releases — no data
Inputs used
releases_count62
latest_release_tagv1.3.8
releases_from_tagsno
days_since_latest_release39
mean_days_between_releases86.8
Excluded from scoring (no data or not applicable): OpenSSF Scorecard: Signed-Releases. Remaining weights renormalized.

Community & Adoption

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

93Exceptional · 17% of overall

Popularity & adoption

93Exceptional
How it's scored
60/60Stars — 5,831 stars
21.8/25Forks — 415 forks
11.4/15Watchers — 113 watchers
Inputs used
forks415
stars5,831
watchers113
growth_stateunverified
growth_factor_pct100
growth_unverified_reasonno_history

Community health

87Excellent
How it's scored
22.5/22.5README
16.9/22.5License — license file present, not a recognized license
18/18CONTRIBUTING guide
13.5/13.5Code of conduct
7.2/7.2Issue template
0/6.3PR template
Inputs used
has_readmeyes
has_licenseyes
readme_badges3
has_contributingyes
has_issue_templateyes
has_code_of_conductyes
readme_badge_servicesbadge.fury.io, shields.io
has_pull_request_templateno

Ecosystem adoption (downloads)

100Exceptional
How it's scored
80/80Total downloads — 1,354,112,885 downloads all-time across rubygems
0/20Registry dependents — not reported by this ecosystem
Inputs used
packagesconcurrent-ruby
dependents—
ecosystemsrubygems
total_downloads1,354,112,885
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?

69Good · 23% of overall

Maintainer resilience (bus factor)

61Moderate
How it's scored
25.2/54Bus factor — 2 contributor(s) cover half of all commits
12.4/22.5Commit distribution — top contributor authored 45% of commits
13.5/13.5Contributor breadth — 99 contributors
10/10OpenSSF Scorecard: Contributors — project has 75 contributing companies or organizations
Inputs used
bus_factor2
contributors_sampled99
top_contributor_share0.45

Issue & PR responsiveness

67Good
How it's scored
37.3/42Issue resolution — 89% of issues closed
25.3/30PR acceptance — 564/669 decided PRs merged
0/13Newcomer PR acceptance — 0/1 first-time contributors' PRs merged in 30d
4.5/15OpenSSF Scorecard: Code-Review — Found 10/26 approved changesets -- score normalized to 3
Inputs used
merged_prs564
open_issues48
closed_issues378
prs_merged_7d0
prs_decided_7d0
prs_merged_30d0
prs_decided_30d1
issue_closed_ratio0.887
closed_unmerged_prs105
first_time_authors_30d1
first_time_prs_merged_30d0
first_time_prs_decided_30d1

Ownership & stewardship

56Moderate
How it's scored
30/30Ownership backing — organization-owned
0/20Verified domain
8.5/25Owner reach — 14 followers of ruby-concurrency
17.7/25Track record — 5 public repos, account ~12 yr old
Inputs used
followers14
owner_typeOrganization
is_verifiedno
owner_loginruby-concurrency
public_repos5
account_age_days4,729

Package maintenance

100Exceptional
How it's scored
25/25Published & resolvable — 1 package(s) on rubygems
35/35Publish recency — latest publish 39 days ago
20/20Version history — 138 published versions
20/20Not deprecated — active, not deprecated or yanked
Inputs used
packagesconcurrent-ruby
ecosystemsrubygems
any_deprecatedno
min_days_since_publish39

Engineering Quality

Are baseline engineering and documentation practices in place?

63Moderate · 19% of overall

Engineering practices

62Moderate
How it's scored
24/24CI workflows — 3 workflow(s)
24/24Tests present
0/16Linter config
0/9.6Pre-commit hooks
0/6.4.editorconfig
14/20OpenSSF Scorecard: CI-Tests — 12 out of 16 merged PRs checked by a CI test -- score normalized to 7
Inputs used
has_ciyes
has_testsyes
has_editorconfigno
has_linter_configno
has_precommit_configno

Documentation

65Good
How it's scored
30/30README
0/25Documentation directory
15/15Documentation / homepage site — https://ruby-concurrency.github.io/concurrent-ruby/
10/10Repository description
10/10Topics — 2 topics
0/10Wiki
Inputs used
topicsconcurrency, ruby
has_wikino
homepagehttps://ruby-concurrency.github.io/concurrent-ruby/
docs_sitehttps://ruby-concurrency.github.io/concurrent-ruby/
has_readmeyes
has_docs_dirno
has_descriptionyes

Security

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

62Moderate · 16% of overall

Security posture

62Moderate
How it's scored
7.5/7.5Binary-Artifacts — no binaries found in the repo
0/7.5Branch-Protection — no data
1.8/2.5CI-Tests — 12 out of 16 merged PRs checked by a CI test -- score normalized to 7
0/2.5CII-Best-Practices — no effort to earn an OpenSSF best practices badge detected
2.2/7.5Code-Review — Found 10/26 approved changesets -- score normalized to 3
2.5/2.5Contributors — project has 75 contributing companies or organizations
10/10Dangerous-Workflow — no dangerous workflow patterns detected
7.5/7.5Dependency-Update-Tool — update tool detected
0/5Fuzzing — project is not fuzzed
2.2/2.5License — license file detected
6.8/7.5Maintained — 11 commit(s) and 0 issue activity found in the last 90 days -- score normalized to 9
0/5Packaging — no data
0/5Pinned-Dependencies — dependency not pinned by hash detected -- score normalized to 0
0/5SAST — SAST tool is not run on all commits -- score normalized to 0
5/5Security-Policy — security policy file detected
0/7.5Signed-Releases — no data
0/7.5Token-Permissions — detected GitHub workflow tokens with excessive permissions
7.5/7.5Vulnerabilities — 0 existing vulnerabilities detected
Inputs used
sourceopenssf_scorecard
checks_evaluated15
scorecard_versionv5.5.0
checks_inconclusive3
scorecard_aggregate6.2
Excluded from scoring (no data or not applicable): Branch-Protection, Packaging, Signed-Releases. 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.

39Weak · 4% of overall

Agent context & guidance

14Critical
How it's scored
0/45Agent instructions — no CLAUDE.md / AGENTS.md / editor rules
0/15Machine-readable docs (llms.txt)
14.5/40Legible commit history — 25 of 92 human commits state their intent (structured subject or explanatory body)
Inputs used
has_llms_txtno
llms_txt_url—
legible_history_share0.272
agent_instruction_files—
agent_instruction_max_bytes—

Verify loop (build / test / typecheck)

30At Risk
How it's scored
0/18One-command bootstrap
22/22Automated tests
0/11Lint / format config
0/11Static type checking
0/10Reproducible environment
0/10Demonstrated agent practice — no agent-authored commits among the last 100
8/8Automated maintenance — 8 of the last 100 commits are automated dependency updates
0/10OpenSSF Scorecard: Pinned-Dependencies — dependency not pinned by hash detected -- score normalized to 0
Inputs used
has_nixno
has_testsyes
lockfiles—
has_dockerfileno
typed_languageno
bootstrap_files—
has_devcontainerno
has_linter_configno
typecheck_configs—
agent_commit_share0
toolchain_manifests—
dependency_bot_commit_share0.08

Code legibility for models

55Moderate
How it's scored
0/45Type-checkable code — Ruby without a type-check config
54.6/55Manageable file sizes — 3/367 source files over 60KB
Inputs used
primary_languageRuby
largest_source_bytes159,301
source_files_sampled367
oversized_source_files3

Machine-readable interfaces

100Exceptional
How it's scored
0/40API schema (OpenAPI/GraphQL/proto) — not applicable to this kind of software
0/20MCP server — not applicable to this kind of software
40/40Runnable examples — examples
Inputs used
example_dirsexamples
has_mcp_signalno
api_schema_files—
interfaces_expected_of—
Excluded from scoring (no data or not applicable): API schema (OpenAPI/GraphQL/proto), MCP server. Remaining weights renormalized.

Key facts

5,831GitHub stars
99contributors
28commits, last 12 months
39days since last push
62releases
2bus factor
48open issues
RubyGemspackage ecosystems

Data collection warnings

  • Star history unavailable: GitHub GraphQL error: Resource not accessible by personal access token
  • rubygems package 'concurrent-ruby-ext' points at a different repository (http://www.concurrent-ruby.com); excluded from ecosystem scoring
  • rubygems package 'concurrent-ruby-edge' points at a different repository (http://www.concurrent-ruby.com); excluded from ecosystem scoring
  • No resolved dependencies carried a version and a supported ecosystem

More detail

Star and fork history 0 ★ / 415 ⇿
0Stars
415Forks
62Releases

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.

010020030040050040752013-112020-032026-08
Major 1Minor 7Patch 30

Each point covers 12 days.

OpenSSF Scorecard 6.2 / 10
6.2aggregate

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 · 2026-08-28 05:02 UTC

10Binary-Artifactsno binaries found in the repo
n/aBranch-Protectioninternal error: error during branchesHandler.setup: internal error: some github tokens can't read classic branch protection rules: https://github.com/ossf/scorecard-action/blob/main/docs/authentication/fine-grained-auth-token.md
7CI-Tests12 out of 16 merged PRs checked by a CI test -- score normalized to 7
0CII-Best-Practicesno effort to earn an OpenSSF best practices badge detected
3Code-ReviewFound 10/26 approved changesets -- score normalized to 3
10Contributorsproject has 75 contributing companies or organizations
10Dangerous-Workflowno dangerous workflow patterns detected
10Dependency-Update-Toolupdate tool detected
0Fuzzingproject is not fuzzed
9Licenselicense file detected
9Maintained11 commit(s) and 0 issue activity found in the last 90 days -- score normalized to 9
n/aPackagingpackaging workflow not detected
0Pinned-Dependenciesdependency not pinned by hash detected -- score normalized to 0
0SASTSAST tool is not run on all commits -- score normalized to 0
10Security-Policysecurity policy file detected
n/aSigned-Releasesno releases found
0Token-Permissionsdetected GitHub workflow tokens with excessive permissions
10Vulnerabilities0 existing vulnerabilities detected
Direct dependencies 8
RegistryPackageVersion constraintManifest
RubyGemsconcurrent-ruby—Gemfile
RubyGemsconcurrent-ruby-edge—Gemfile
RubyGemsconcurrent-ruby-ext—Gemfile
RubyGemsyard~> 0.9.0Gemfile
RubyGemsredcarpet~> 3.0Gemfile
RubyGemsmd-ruby-eval~> 0.6Gemfile
RubyGemssimplecov~> 0.16.0Gemfile
RubyGemscoveralls~> 0.8.2Gemfile
All dependencies 11

Full resolved dependency set from the GitHub dependency graph: 5 direct and 6 indirect (transitive) packages. The transitive closure is complete when the repository commits a lockfile.

RegistryPackageVersionRelation
RubyGemscoveralls—direct
RubyGemsmd-ruby-eval—direct
RubyGemsredcarpet—direct
RubyGemssimplecov—direct
RubyGemsyard—direct
RubyGemspry—indirect
RubyGemsrake—indirect
RubyGemsrake-compiler-dock—indirect
RubyGemsrspec—indirect
RubyGemssigdump—indirect
RubyGemstimecop—indirect
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

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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 statistics — RubyGems.