Public record
Software health reportschema 0.34.0 · metrics 2.10.0 · 2026-09-12 00:31 UTC

yjacquin / fast-mcp

A Ruby Implementation of the Model Context Protocol

RubyMIT★ 1,189 stars⑂ 106 forkssince Mar 2025View on GitHub ↗
KindCommand-line toolLibraryNetwork servicehow this is determined
#ai#llm#mcp#rack#ruby

yjacquin/fast-mcp holds a health index of 56 out of 100, placing it in the Moderate band. It scores highest on Engineering Quality (74/100) and lowest on Vitality (38/100). It was last updated 270 days ago. A single contributor accounts for most of its recent work.

56
overall / 100
Moderate

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.

56
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 54 is calibrated to 56 on the published index scale (record calibration 2026-08-02).

Ownership

Yorick JacquinPersonal account
59 followers1 public reposince Jun 2019@wax-app

This repository is owned by a personal account. A single-owner project carries more continuity risk than an organization-backed one.

Package ecosystems

RegistryPackageVersionDownloads / moVersionsLast publish
RubyGemsfast-mcppoints to another repo — not scored1.6.0-10348 days ago

Metrics by category

Vitality

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

38Weak · 21% of overall

Development activity

16Critical
How it's scored
3.6/36Push recency — last push 270 days ago
1.4/36Commit cadence — 2/52 weeks with commits
10.8/18Commit volume — 15 commits in the last year
0/10OpenSSF Scorecard: Maintained — 0 commit(s) and 0 issue activity found in the last 90 days -- score normalized to 0
Inputs used
commits_last_year15
human_commit_share0.959
days_since_last_push270
active_weeks_last_year2

Release discipline

70Good
How it's scored
27/27Ships releases — 10 releases published
16.2/36Release recency — latest release 348 days ago
27/27Release cadence — a release every ~20.2 days
0/10OpenSSF Scorecard: Signed-Releases — Project has not signed or included provenance with any releases.
Inputs used
releases_count10
latest_release_tagv1.6.0
releases_from_tagsno
days_since_latest_release348
mean_days_between_releases20.2

Community & Adoption

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

72Good · 17% of overall

Popularity & adoption

73Good
How it's scored
49.9/60Stars — 1,189 stars
16.8/25Forks — 106 forks
6.5/15Watchers — 16 watchers
Inputs used
forks106
stars1,189
watchers16
growth_stateunverified
growth_factor_pct100
growth_unverified_reasonno_history

Community health

70Good
How it's scored
22.5/22.5README
22.5/22.5License — recognized license (MIT)
18/18CONTRIBUTING guide
0/13.5Code of conduct
0/7.2Issue template
0/6.3PR template
Inputs used
has_readmeyes
has_licenseyes
readme_badges4
has_contributingyes
has_issue_templateno
has_code_of_conductno
readme_badge_servicesbadge.fury.io, github.com, shields.io
has_pull_request_templateno

Sustainability & Governance

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

46Weak · 23% of overall

Maintainer resilience (bus factor)

41Weak
How it's scored
9/54Bus factor — 1 contributor(s) cover half of all commits
8.3/22.5Commit distribution — top contributor authored 63% of commits
13.5/13.5Contributor breadth — 21 contributors
10/10OpenSSF Scorecard: Contributors — project has 8 contributing companies or organizations
Inputs used
bus_factor1
contributors_sampled21
top_contributor_share0.629

Issue & PR responsiveness

52Moderate
How it's scored
16.4/42Issue resolution — 39% of issues closed
21.5/30PR acceptance — 53/74 decided PRs merged
0/13Newcomer PR acceptance — no first-time contributor's PR decided in 30d
7.5/15OpenSSF Scorecard: Code-Review — Found 16/28 approved changesets -- score normalized to 5
Inputs used
merged_prs53
open_issues47
closed_issues30
prs_merged_7d0
prs_decided_7d0
prs_merged_30d0
prs_decided_30d1
issue_closed_ratio0.39
closed_unmerged_prs21
first_time_authors_30d0
first_time_prs_merged_30d0
first_time_prs_decided_30d0
Excluded from scoring (no data or not applicable): Newcomer PR acceptance. Remaining weights renormalized.

Ownership & stewardship

46Weak
How it's scored
10/30Ownership backing — personal (user) account
0/20Verified domain — not applicable to user accounts
12.8/25Owner reach — 59 followers of yjacquin
14.2/25Track record — 1 public repos, account ~7 yr old
Inputs used
followers59
owner_typeUser
is_verified—
owner_loginyjacquin
public_repos1
account_age_days2,642
Excluded from scoring (no data or not applicable): Verified domain. Remaining weights renormalized.

Engineering Quality

Are baseline engineering and documentation practices in place?

74Good · 19% of overall

Engineering practices

66Good
How it's scored
24/24CI workflows — 3 workflow(s)
24/24Tests present
16/16Linter config — .rubocop.yml
0/9.6Pre-commit hooks
0/6.4.editorconfig
2/20OpenSSF Scorecard: CI-Tests — 4 out of 24 merged PRs checked by a CI test -- score normalized to 1
Inputs used
has_ciyes
has_testsyes
has_editorconfigno
has_linter_configyes
has_precommit_configno

Documentation

85Excellent
How it's scored
30/30README
25/25Documentation directory
0/15Documentation / homepage site
10/10Repository description
10/10Topics — 5 topics
10/10Wiki
Inputs used
topicsai, llm, mcp, rack, ruby
has_wikiyes
homepage—
docs_site—
has_readmeyes
has_docs_diryes
has_descriptionyes

Security

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

47Weak · 16% of overall

Security posture

44Weak
How it's scored
7.5/7.5Binary-Artifacts — no binaries found in the repo
2.2/7.5Branch-Protection — branch protection is not maximal on development and all release branches
0.2/2.5CI-Tests — 4 out of 24 merged PRs checked by a CI test -- score normalized to 1
0/2.5CII-Best-Practices — no effort to earn an OpenSSF best practices badge detected
3.8/7.5Code-Review — Found 16/28 approved changesets -- score normalized to 5
2.5/2.5Contributors — project has 8 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
2.5/2.5License — license file detected
0/7.5Maintained — 0 commit(s) and 0 issue activity found in the last 90 days -- score normalized to 0
5/5Packaging — packaging workflow detected
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 — Project has not signed or included provenance with any releases.
0/7.5Token-Permissions — detected GitHub workflow tokens with excessive permissions
0/7.5Vulnerabilities — 77 existing vulnerabilities detected
Inputs used
sourceopenssf_scorecard
checks_evaluated18
scorecard_versionv5.5.0
checks_inconclusive0
scorecard_aggregate4.4

Dependency advisories

57Moderate
How it's scored
12.4/35Direct dependencies free of known advisories — 2 affected: puma 6.6.0 (high 7.5), sinatra 4.1.1 (moderate 5.3)
0/25Indirect dependencies free of known advisories — transitive set not separable from development and test dependencies in this scope
30.3/40No advisories left outstanding — 2 advisory-carrying package(s) unaddressed past 90 days; oldest published 336 days ago
Inputs used
sourceosv
advisories98
affected_packages24
assessed_packages150
unassessed_packages6
affected_by_severitycritical 3, high 9, moderate 8, low 4
direct_affected_packages2
Excluded from scoring (no data or not applicable): Indirect dependencies free of known advisories. Remaining weights renormalized. Matched 150 resolved dependencies against OSV. 6 could not be assessed — no resolved version, an unsupported ecosystem, or beyond the reported package list. This repository publishes no package the index resolves, so the repository dependency graph was assessed instead. That graph mixes development and test pins with shipped dependencies, so only the declared runtime dependencies are scored; transitive findings are reported as context and excluded from the score. Reachability is not analyzed.

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.

45Weak · 4% of overall

Agent context & guidance

34At Risk
How it's scored
0/45Agent instructions — no CLAUDE.md / AGENTS.md / editor rules
0/15Machine-readable docs (llms.txt)
33.5/40Legible commit history — 44 of 70 human commits state their intent (structured subject or explanatory body)
Inputs used
has_llms_txtno
llms_txt_url—
legible_history_share0.629
agent_instruction_files—
agent_instruction_max_bytes—

Verify loop (build / test / typecheck)

51Moderate
How it's scored
0/18One-command bootstrap
22/22Automated tests
11/11Lint / format config — .rubocop.yml
0/11Static type checking
10/10Reproducible environment — Dockerfile, lockfile
0/10Demonstrated agent practice — no agent-authored commits among the last 73
8/8Automated maintenance — 3 of the last 73 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
lockfilesGemfile.lock
has_dockerfileyes
typed_languageno
bootstrap_files—
has_devcontainerno
has_linter_configyes
typecheck_configs—
agent_commit_share0
toolchain_manifests—
dependency_bot_commit_share0.041

Code legibility for models

55Moderate
How it's scored
0/45Type-checkable code — Ruby without a type-check config
55/55Manageable file sizes — 0/71 source files over 60KB
Inputs used
primary_languageRuby
largest_source_bytes25,635
source_files_sampled71
oversized_source_files0

Machine-readable interfaces

40Weak
How it's scored
0/40API schema (OpenAPI/GraphQL/proto)
0/20MCP server
40/40Runnable examples — examples
Inputs used
example_dirsexamples
has_mcp_signalno
api_schema_files—
interfaces_expected_ofnetwork-service

Key facts

1,189GitHub stars
21contributors
15commits, last 12 months
270days since last push
10releases
1bus factor
47open issues
RubyGemspackage ecosystems

Data collection warnings

  • Star history unavailable: GitHub GraphQL error: Resource not accessible by personal access token
  • rubygems package 'fast-mcp' points at a different repository (https://github.com/yjacquin/fast_mcp); excluded from ecosystem scoring

More detail

Star and fork history 0 ★ / 106 ⇿
0Stars
106Forks
10Releases

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.

0204060801009842025-032025-122026-08
Major 1Minor 7Patch 2

Each point covers 2 days.

OpenSSF Scorecard 4.4 / 10
4.4aggregate

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 · 2026-09-12 00:30 UTC

10Binary-Artifactsno binaries found in the repo
3Branch-Protectionbranch protection is not maximal on development and all release branches
1CI-Tests4 out of 24 merged PRs checked by a CI test -- score normalized to 1
0CII-Best-Practicesno effort to earn an OpenSSF best practices badge detected
5Code-ReviewFound 16/28 approved changesets -- score normalized to 5
10Contributorsproject has 8 contributing companies or organizations
10Dangerous-Workflowno dangerous workflow patterns detected
10Dependency-Update-Toolupdate tool detected
0Fuzzingproject is not fuzzed
10Licenselicense file detected
0Maintained0 commit(s) and 0 issue activity found in the last 90 days -- score normalized to 0
10Packagingpackaging workflow 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
0Signed-ReleasesProject has not signed or included provenance with any releases.
0Token-Permissionsdetected GitHub workflow tokens with excessive permissions
0Vulnerabilities77 existing vulnerabilities detected
Direct dependencies 3
RegistryPackageVersion constraintManifest
RubyGemspuma—Gemfile
RubyGemsrackup—Gemfile
RubyGemssinatra—Gemfile
All dependencies 156

Full resolved dependency set from the GitHub dependency graph: 3 direct and 153 indirect (transitive) packages. The transitive closure is complete when the repository commits a lockfile.

RegistryPackageVersionRelation
RubyGemspuma6.6.0direct
RubyGemsrackup2.2.1direct
RubyGemssinatra4.1.1direct
RubyGemsactioncable8.0.2indirect
RubyGemsactionmailbox8.0.2indirect
RubyGemsactionmailer8.0.2indirect
RubyGemsactionpack8.0.2indirect
RubyGemsactiontext8.0.2indirect
RubyGemsactionview8.0.2indirect
RubyGemsactivejob8.0.2indirect
RubyGemsactivemodel8.0.2indirect
RubyGemsactiverecord8.0.2indirect
RubyGemsactivestorage8.0.2indirect
RubyGemsactivesupport8.0.2indirect
RubyGemsaddressable—indirect
RubyGemsaddressable2.8.7indirect
RubyGemsast2.4.3indirect
RubyGemsbase64—indirect
RubyGemsbase640.2.0indirect
RubyGemsbase640.3.0indirect
RubyGemsbcrypt_pbkdf1.1.1indirect
RubyGemsbenchmark0.4.0indirect
RubyGemsbigdecimal3.1.9indirect
RubyGemsbigdecimal3.2.2indirect
RubyGemsbindex0.8.1indirect
RubyGemsbootsnap1.18.4indirect
RubyGemsbrakeman7.0.0indirect
RubyGemsbuilder3.3.0indirect
RubyGemscapybara3.40.0indirect
RubyGemscoderay1.1.3indirect
RubyGemsconcurrent-ruby1.3.5indirect
RubyGemsconnection_pool2.5.0indirect
RubyGemscrass1.0.6indirect
RubyGemsdate3.4.1indirect
RubyGemsdebug1.10.0indirect
RubyGemsdiff-lcs1.6.2indirect
RubyGemsdotenv3.1.7indirect
RubyGemsdrb2.2.1indirect
RubyGemsdry-configurable1.3.0indirect
RubyGemsdry-core1.1.0indirect
RubyGemsdry-inflector1.2.0indirect
RubyGemsdry-initializer3.2.0indirect
RubyGemsdry-logic1.6.0indirect
RubyGemsdry-schema—indirect
RubyGemsdry-schema1.14.1indirect
RubyGemsdry-types1.8.2indirect
RubyGemsdry-types1.8.3indirect
RubyGemsed255191.3.0indirect
RubyGemserubi1.13.1indirect
RubyGemset-orbi1.2.11indirect
RubyGemsfugit1.11.1indirect
RubyGemsglobalid1.2.1indirect
RubyGemsi18n1.14.7indirect
RubyGemsimportmap-rails2.1.0indirect
RubyGemsio-console0.8.0indirect
RubyGemsirb1.15.1indirect
RubyGemsjbuilder2.13.0indirect
RubyGemsjson—indirect
RubyGemsjson2.10.2indirect
RubyGemsjson2.12.2indirect
RubyGemskamal2.5.3indirect
RubyGemslanguage_server-protocol3.17.0.5indirect
RubyGemslint_roller1.1.0indirect
RubyGemslogger1.6.6indirect
RubyGemslogger1.7.0indirect
RubyGemsloofah2.24.0indirect
RubyGemsmail2.8.1indirect
RubyGemsmarcel1.0.4indirect
RubyGemsmatrix0.4.2indirect
RubyGemsmethod_source1.1.0indirect
RubyGemsmime-types—indirect
RubyGemsmime-types3.6.2indirect
RubyGemsmime-types3.7.0indirect
RubyGemsmime-types-data3.2025.0318indirect
RubyGemsmime-types-data3.2025.0708indirect
RubyGemsmini_mime1.1.5indirect
RubyGemsminitest5.25.5indirect
RubyGemsmsgpack1.8.0indirect
RubyGemsmustermann3.0.3indirect
RubyGemsnet-imap0.5.6indirect
RubyGemsnet-pop0.1.2indirect
RubyGemsnet-protocol0.2.2indirect
RubyGemsnet-scp4.1.0indirect
RubyGemsnet-sftp4.0.0indirect
RubyGemsnet-smtp0.5.1indirect
RubyGemsnet-ssh7.3.0indirect
RubyGemsnio4r2.7.4indirect
RubyGemsnokogiri1.18.6indirect
RubyGemsostruct0.6.1indirect
RubyGemsparallel1.27.0indirect
RubyGemsparser3.3.8.0indirect
RubyGemspp0.6.2indirect
RubyGemsprettyprint0.2.0indirect
RubyGemsprism1.4.0indirect
RubyGemspropshaft1.1.0indirect
RubyGemspry0.15.2indirect
RubyGemspsych5.2.3indirect
RubyGemspublic_suffix6.0.1indirect
RubyGemspublic_suffix6.0.2indirect
RubyGemsraabro1.4.0indirect
RubyGemsracc1.8.1indirect
RubyGemsrack—indirect
RubyGemsrack3.1.12indirect
RubyGemsrack3.1.16indirect
RubyGemsrack-protection4.1.1indirect
RubyGemsrack-session2.1.0indirect
RubyGemsrack-session2.1.1indirect
RubyGemsrack-test2.2.0indirect
RubyGemsrails8.0.2indirect
RubyGemsrails-dom-testing2.2.0indirect
RubyGemsrails-html-sanitizer1.6.2indirect
RubyGemsrailties8.0.2indirect
RubyGemsrainbow3.1.1indirect
RubyGemsrake13.2.1indirect
RubyGemsrake13.3.0indirect
RubyGemsrdoc6.13.0indirect
RubyGemsregexp_parser2.10.0indirect
RubyGemsreline0.6.0indirect
RubyGemsrexml3.4.1indirect
RubyGemsrspec3.13.1indirect
RubyGemsrspec-core3.13.5indirect
RubyGemsrspec-expectations3.13.5indirect
RubyGemsrspec-mocks3.13.5indirect
RubyGemsrspec-support3.13.4indirect
RubyGemsrubocop1.78.0indirect
RubyGemsrubocop-ast1.45.1indirect
RubyGemsrubocop-rspec3.6.0indirect
RubyGemsruby-progressbar1.13.0indirect
RubyGemsruby2_keywords0.0.5indirect
RubyGemsrubyzip2.4.1indirect
RubyGemssecurerandom0.4.1indirect
RubyGemsselenium-webdriver4.30.1indirect
RubyGemssolid_cable3.0.7indirect
RubyGemssolid_cache1.0.7indirect
RubyGemssolid_queue1.1.4indirect
RubyGemssqlite32.6.0indirect
RubyGemssshkit1.24.0indirect
RubyGemsstimulus-rails1.3.4indirect
RubyGemsstringio3.1.5indirect
RubyGemsthor1.3.2indirect
RubyGemsthruster0.1.12indirect
RubyGemstilt2.6.1indirect
RubyGemstimeout0.4.3indirect
RubyGemsturbo-rails2.0.13indirect
RubyGemstzinfo2.0.6indirect
RubyGemsunicode-display_width3.1.4indirect
RubyGemsunicode-emoji4.0.4indirect
RubyGemsuri1.0.3indirect
RubyGemsuseragent0.16.11indirect
RubyGemsweb-console4.2.1indirect
RubyGemswebsocket1.2.11indirect
RubyGemswebsocket-driver0.7.7indirect
RubyGemswebsocket-extensions0.1.5indirect
RubyGemsxpath3.2.0indirect
RubyGemszeitwerk2.7.2indirect
RubyGemszeitwerk2.7.3indirect
Dependency advisories 24

This repository publishes no package the index resolves, so its own dependency graph was assessed — 150 packages, which also include development and test pins that never ship: 24 carry known advisories, of which 2 are direct. 6 could not be assessed — no resolved version, an unsupported ecosystem, or beyond the reported package list.

PackageVersionRelationSeverityAdvisoriesFixed in
activestorage8.0.2indirectcritical78.1.3.1
rack-session2.1.0indirectcritical22.1.2
rack-session2.1.1indirectcritical12.1.2
puma6.6.0directhigh28.0.2
activesupport8.0.2indirecthigh38.1.2.1
addressable2.8.7indirecthigh12.9.0
concurrent-ruby1.3.5indirecthigh31.3.7
nokogiri1.18.6indirecthigh131.19.4
rack3.1.12indirecthigh213.2.6
rack3.1.16indirecthigh193.2.6
uri1.0.3indirecthigh11.0.4
websocket-driver0.7.7indirecthigh40.8.2
sinatra4.1.1directmoderate14.2.0
activerecord8.0.2indirectmoderate18.0.2.1
loofah2.24.0indirectmoderate12.25.2
mail2.8.1indirectmoderate12.9.1
msgpack1.8.0indirectmoderate11.8.2
net-imap0.5.6indirectmoderate90.6.4.1
rexml3.4.1indirectmoderate13.4.2
sqlite32.6.0indirectmoderate22.9.5
actionview8.0.2indirectlow18.1.2.1
json2.10.2indirectlow12.19.9
json2.12.2indirectlow12.19.9
rails-html-sanitizer1.6.2indirectlow11.7.1

An advisory means the version recorded in the dependency graph falls inside an advisory’s affected range. Reachability is not analysed, and the graph includes development and test pins — a finding may concern tooling rather than shipped software.

Raw JSON report machine-readable

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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.