Public recordModerate
Software health reportschema 0.27.0 · metrics 1.13.0 · 2026-07-26 01:35 UTC
FasterXML / jackson-module-kotlin
Module that adds support for serialization/deserialization of Kotlin (http://kotlinlang.org) classes and data classes.
FasterXML/jackson-module-kotlin holds a health index of 69 out of 100, placing it in the Moderate band. It scores highest on Security (78/100) and lowest on Vitality (56/100). It was last updated 6 days ago. 2 contributors account for most of its recent work.
69
overall / 100Software health index
Metrics are grouped into weighted categories on one standardized 1–100 scale. Overall starts as their weighted mean; when public evidence triggers the High-Risk Jurisdiction Policy, the rating is adjusted and receives an At risk ceiling of 49. AI Readiness sits outside the overall score.
69
Excellent85-100Exemplary; meets essentially all checked criteria
Good70-84Healthy; minor gaps
Moderate50-69Acceptable with notable gaps; review recommended
At risk30-49Significant weaknesses; adoption warrants caution
Critical1-29Severe problems (abandoned, single-maintainer, no hygiene)
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.
Ownership
FasterXML, LLCOrganization
421 followers68 public repossince Sep 2010
This repository is backed by an organization — shared, accountable stewardship that can outlive any single maintainer.
Package ecosystems
| Registry | Package | Version | Downloads / mo | Versions | Last publish |
|---|---|---|---|---|---|
| Maven | tools.jackson.module:jackson-module-kotlin | 3.2.1 | - | 24 | 15 days ago |
Metrics by category
Vitality
Is the project alive — is code being written and are releases shipping?
56
Development activity
93Excellent
How it's scored
| 36/36 | Push recency — last push 6 days ago |
| 29.1/36 | Commit cadence — 42/52 weeks with commits |
| 18/18 | Commit volume — 501 commits in the last year |
| 10/10 | OpenSSF Scorecard: Maintained — 30 commit(s) and 8 issue activity found in the last 90 days -- score normalized to 10 |
Inputs used
| commits_last_year | 501 |
| human_commit_share | 0.98 |
| days_since_last_push | 6 |
| active_weeks_last_year | 42 |
Release discipline
1Critical
How it's scored
| 0/27 | Ships releases — no releases published |
| 0/36 | Release recency — no releases |
| 0/27 | Release cadence — no releases |
| 0/10 | OpenSSF Scorecard: Signed-Releases — no data |
Inputs used
| releases_count | 0 |
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?
67
Popularity & adoption
76Good
How it's scored
| 49.9/60 | Stars — 1,185 stars |
| 18.9/25 | Forks — 184 forks |
| 7.2/15 | Watchers — 21 watchers |
Inputs used
| forks | 184 |
| stars | 1,185 |
| watchers | 21 |
| growth_state | unverified |
| growth_factor_pct | 100 |
| growth_unverified_reason | no_history |
Community health
57Moderate
How it's scored
| 22.5/22.5 | README |
| 22.5/22.5 | License — recognized license (Apache-2.0) |
| 0/18 | CONTRIBUTING guide |
| 0/13.5 | Code of conduct |
| 0/7.2 | Issue template |
| 6.3/6.3 | PR template |
Inputs used
| has_readme | yes |
| has_license | yes |
| has_contributing | no |
| has_issue_template | no |
| has_code_of_conduct | no |
| has_pull_request_template | yes |
Sustainability & Governance
Will the project survive its people — bus factor, responsiveness, who backs it, and package upkeep?
76
Maintainer resilience (bus factor)
62Moderate
How it's scored
| 25.2/54 | Bus factor — 2 contributor(s) cover half of all commits |
| 13.6/22.5 | Commit distribution — top contributor authored 40% of commits |
| 13.5/13.5 | Contributor breadth — 58 contributors |
| 10/10 | OpenSSF Scorecard: Contributors — project has 14 contributing companies or organizations |
Inputs used
| bus_factor | 2 |
| contributors_sampled | 58 |
| top_contributor_share | 0.396 |
How it's scored
| 42.9/46.8 | Issue resolution — 92% of issues closed |
| 32.9/38.3 | PR acceptance — 490/570 decided PRs merged |
| 0/15 | OpenSSF Scorecard: Code-Review — Found 0/20 approved changesets -- score normalized to 0 |
Inputs used
| merged_prs | 490 |
| open_issues | 50 |
| closed_issues | 557 |
| issue_closed_ratio | 0.918 |
| closed_unmerged_prs | 80 |
Ownership & stewardship
74Good
How it's scored
| 30/30 | Ownership backing — organization-owned |
| 0/20 | Verified domain |
| 18.9/25 | Owner reach — 421 followers of FasterXML |
| 25/25 | Track record — 68 public repos, account ~15 yr old |
Inputs used
| followers | 421 |
| owner_type | Organization |
| is_verified | — |
| owner_login | FasterXML |
| public_repos | 68 |
| account_age_days | 5,807 |
Package maintenance
100Excellent
How it's scored
| 25/25 | Published & resolvable — 1 package(s) on maven |
| 35/35 | Publish recency — latest publish 15 days ago |
| 20/20 | Version history — 24 published versions |
| 20/20 | Not deprecated — active, not deprecated or yanked |
Inputs used
| packages | tools.jackson.module:jackson-module-kotlin |
| ecosystems | maven |
| any_deprecated | no |
| min_days_since_publish | 15 |
Engineering Quality
Are baseline engineering and documentation practices in place?
70
Engineering practices
60Moderate
How it's scored
| 24/24 | CI workflows — 3 workflow(s) |
| 24/24 | Tests present |
| 0/16 | Linter config |
| 0/9.6 | Pre-commit hooks |
| 0/6.4 | .editorconfig |
| 12/20 | OpenSSF Scorecard: CI-Tests — 5 out of 8 merged PRs checked by a CI test -- score normalized to 6 |
Inputs used
| has_ci | yes |
| has_tests | yes |
| has_editorconfig | no |
| has_linter_config | no |
| has_precommit_config | no |
Documentation
85Excellent
How it's scored
| 30/30 | README |
| 25/25 | Documentation directory |
| 0/15 | Documentation / homepage site |
| 10/10 | Repository description |
| 10/10 | Topics — 7 topics |
| 10/10 | Wiki |
Inputs used
| topics | kotlin, jackson, json, serialization, deserialization, hacktoberfest, kotlin-library |
| has_wiki | yes |
| homepage | — |
| has_readme | yes |
| has_docs_dir | yes |
| has_description | yes |
Security
Are visible security and supply-chain practices strong, without unresolved high-risk jurisdiction exposure?
78
Security posture
72Good
How it's scored
| 6.8/7.5 | Binary-Artifacts — binaries present in source code |
| 2.2/7.5 | Branch-Protection — branch protection is not maximal on development and all release branches |
| 1.5/2.5 | CI-Tests — 5 out of 8 merged PRs checked by a CI test -- score normalized to 6 |
| 0/2.5 | CII-Best-Practices — no effort to earn an OpenSSF best practices badge detected |
| 0/7.5 | Code-Review — Found 0/20 approved changesets -- score normalized to 0 |
| 2.5/2.5 | Contributors — project has 14 contributing companies or organizations |
| 10/10 | Dangerous-Workflow — no dangerous workflow patterns detected |
| 7.5/7.5 | Dependency-Update-Tool — update tool detected |
| 0/5 | Fuzzing — project is not fuzzed |
| 2.5/2.5 | License — license file detected |
| 7.5/7.5 | Maintained — 30 commit(s) and 8 issue activity found in the last 90 days -- score normalized to 10 |
| 5/5 | Packaging — packaging workflow detected |
| 5/5 | Pinned-Dependencies — all dependencies are pinned |
| 0/5 | SAST — SAST tool is not run on all commits -- score normalized to 0 |
| 5/5 | Security-Policy — security policy file detected |
| 0/7.5 | Signed-Releases — no data |
| 7.5/7.5 | Token-Permissions — GitHub workflow tokens follow principle of least privilege |
| 7.5/7.5 | Vulnerabilities — 0 existing vulnerabilities detected |
Inputs used
| source | openssf_scorecard |
| checks_evaluated | 17 |
| scorecard_version | v5.5.0 |
| checks_inconclusive | 1 |
| scorecard_aggregate | 7.2 |
Excluded from scoring (no data or not applicable): signed_releases. Remaining weights renormalized.
Dependency advisories
100Excellent
How it's scored
| 35/35 | Direct dependencies free of known advisories — no direct dependency carries a known advisory |
| 25/25 | Indirect dependencies free of known advisories — no indirect dependency carries a known advisory |
| 0/40 | No advisories left outstanding — no advisory carries a publication date |
Inputs used
| source | osv |
| advisories | 0 |
| affected_packages | 0 |
| assessed_packages | 8 |
| unassessed_packages | 0 |
| affected_by_severity | none |
| direct_affected_packages | 0 |
Excluded from scoring (no data or not applicable): No advisories left outstanding. Remaining weights renormalized. Matched the maven:tools.jackson.module:jackson-module-kotlin@3.2.1 runtime dependency closure — what installing the published package pulls in — 8 packages. Reachability is not analyzed.
AI Readiness
How well is the repo equipped to be developed and maintained with AI coding agents? An independent, experimental badge — weight 0.0, so it is surfaced on its own and does not affect the overall health score.
58
Agent context & guidance
17Critical
How it's scored
| 0/45 | Agent instructions — no CLAUDE.md / AGENTS.md / editor rules |
| 0/15 | Machine-readable docs (llms.txt) |
| 16.9/40 | Legible commit history — 31 of 98 human commits state their intent (structured subject or explanatory body) |
Inputs used
| has_llms_txt | no |
| legible_history_share | 0.316 |
| agent_instruction_files | — |
| agent_instruction_max_bytes | — |
How it's scored
| 12.6/18 | One-command bootstrap — pom.xml (toolchain convention, no task runner) |
| 22/22 | Automated tests |
| 0/11 | Lint / format config |
| 11/11 | Static type checking — Kotlin (statically typed) |
| 0/10 | Reproducible environment |
| 10/10 | Demonstrated agent practice — 8 of the last 100 commits agent-authored or agent-credited |
| 8/8 | Automated maintenance — 2 of the last 100 commits are automated dependency updates |
| 10/10 | OpenSSF Scorecard: Pinned-Dependencies — all dependencies are pinned |
Inputs used
| has_nix | no |
| has_tests | yes |
| lockfiles | — |
| has_dockerfile | no |
| typed_language | yes |
| bootstrap_files | — |
| has_devcontainer | no |
| has_linter_config | no |
| typecheck_configs | — |
| agent_commit_share | 0.08 |
| toolchain_manifests | pom.xml |
| dependency_bot_commit_share | 0.02 |
Code legibility for models
100Excellent
How it's scored
| 45/45 | Type-checkable code — Kotlin (statically typed) |
| 55/55 | Manageable file sizes — 0/239 source files over 60KB |
Inputs used
| primary_language | Kotlin |
| largest_source_bytes | 57,119 |
| source_files_sampled | 239 |
| oversized_source_files | 0 |
Key facts
1,185GitHub stars
58contributors
501commits, last 12 months
6days since last push
0releases
2bus factor
50open issues
Mavenpackage ecosystems
Data collection warnings
- Star history unavailable: GitHub GraphQL error: Resource not accessible by personal access token
More detail
Star and fork history 0 ★ / 184 ⇿
0Stars
184Forks
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.
Each point covers 11 days.
OpenSSF Scorecard 7.2 / 10
7.2aggregate
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).
| 9 | Binary-Artifacts | binaries present in source code |
| 3 | Branch-Protection | branch protection is not maximal on development and all release branches |
| 6 | CI-Tests | 5 out of 8 merged PRs checked by a CI test -- score normalized to 6 |
| 0 | CII-Best-Practices | no effort to earn an OpenSSF best practices badge detected |
| 0 | Code-Review | Found 0/20 approved changesets -- score normalized to 0 |
| 10 | Contributors | project has 14 contributing companies or organizations |
| 10 | Dangerous-Workflow | no dangerous workflow patterns detected |
| 10 | Dependency-Update-Tool | update tool detected |
| 0 | Fuzzing | project is not fuzzed |
| 10 | License | license file detected |
| 10 | Maintained | 30 commit(s) and 8 issue activity found in the last 90 days -- score normalized to 10 |
| 10 | Packaging | packaging workflow detected |
| 10 | Pinned-Dependencies | all dependencies are pinned |
| 0 | SAST | SAST tool is not run on all commits -- score normalized to 0 |
| 10 | Security-Policy | security policy file detected |
| n/a | Signed-Releases | no releases found |
| 10 | Token-Permissions | GitHub workflow tokens follow principle of least privilege |
| 10 | Vulnerabilities | 0 existing vulnerabilities detected |
Direct dependencies 4
| Registry | Package | Version constraint | Manifest |
|---|---|---|---|
| Maven | tools.jackson.core:jackson-databind | — | pom.xml |
| Maven | com.fasterxml.jackson.core:jackson-annotations | — | pom.xml |
| Maven | org.jetbrains.kotlin:kotlin-reflect | ${version.kotlin} | pom.xml |
| Maven | tools.jackson.module:jackson-module-kotlin | 3.1.0 | pom.xml |
All dependencies 18
Full resolved dependency set from the GitHub dependency graph: 3 direct and 15 indirect (transitive) packages. The transitive closure is complete when the repository commits a lockfile.
| Registry | Package | Version | Relation |
|---|---|---|---|
| Maven | com.fasterxml.jackson.core:jackson-annotations | — | direct |
| Maven | org.jetbrains.kotlin:kotlin-reflect | 2.2.21 | direct |
| Maven | tools.jackson.core:jackson-databind | — | direct |
| Maven | com.github.siom79.japicmp:japicmp-maven-plugin | 0.23.1 | indirect |
| Maven | com.google.code.maven-replacer-plugin:replacer | — | indirect |
| Maven | org.apache.maven.plugins:maven-compiler-plugin | — | indirect |
| Maven | org.apache.maven.plugins:maven-surefire-plugin | — | indirect |
| Maven | org.codehaus.mojo:build-helper-maven-plugin | — | indirect |
| Maven | org.cyclonedx:cyclonedx-maven-plugin | — | indirect |
| Maven | org.gradlex:gradle-module-metadata-maven-plugin | — | indirect |
| Maven | org.jetbrains.kotlin:kotlin-maven-plugin | 2.2.21 | indirect |
| Maven | org.jetbrains.kotlin:kotlin-stdlib | 2.2.21 | indirect |
| Maven | org.jetbrains.kotlin:kotlin-stdlib-jdk8 | 2.2.21 | indirect |
| Maven | org.jetbrains.kotlin:kotlin-test-junit5 | 2.2.21 | indirect |
| Maven | org.jetbrains:annotations | 26.0.1 | indirect |
| Maven | tools.jackson.dataformat:jackson-dataformat-csv | — | indirect |
| Maven | tools.jackson.dataformat:jackson-dataformat-xml | — | indirect |
| Maven | tools.jackson.dataformat:jackson-dataformat-yaml | — | indirect |
Dependency advisories 0
Installing maven:tools.jackson.module:jackson-module-kotlin@3.2.1 pulls in 8 packages, direct and transitive: 0 carry known advisories, of which 0 are direct dependencies.
No known advisories affect the assessed dependencies.
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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"oid": "7840fbebd6ba9f64c46b93de2537964bc3d59f07",
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"headline": "Merge pull request #1196 from k163377/doc-null-safety-3x",
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"oid": "c8ab536a12162cddd9e93b1da5bd96ac4b5f5109",
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"headline": "Merge pull request #1198 from FasterXML/3.1",
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"oid": "5436d91f19d9b26334b37abefa9e9aec9163f0fc",
"body": "Update README description of deserialization shorthands for 3.x",
"is_bot": false,
"headline": "Merge pull request #1197 from k163377/fix-readme-for-3x",
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"oid": "95c7e0138b18bb099eb8eae9ab7fbbc3c65f23a3",
"body": "The section merged from 2.x carried descriptions that do not hold in 3.x:\n\n- The URL source was listed, though ObjectMapper.readValue(URL) does not exist in 3.x.\n- The thrown exception was described as RuntimeJsonMappingException, which is DatabindException in 3.x.\n\nCo-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>",
"is_bot": false,
"headline": "Updated README description of shorthands for 3.x",
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"headline": "Merge pull request #1195 from FasterXML/3.1",
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"oid": "ce13aaa9e66a1c355e3464ac451e3d8582345668",
"body": "# Conflicts:\n#\tsrc/main/kotlin/tools/jackson/module/kotlin/Extensions.kt",
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"headline": "Merge remote-tracking branch 'FasterXML/2.x' into 3.1",
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"oid": "732f1a2b3996553d3bd191b278e17b639026989e",
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"headline": "Update release notes wrt #1192",
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{
"oid": "545f721a13316275357ba394009c16b3d75ee879",
"body": "The usage section described the extensions only as a way to reify type parameters,\nso it listed neither what is provided nor the checks some of them perform.\n\nCo-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>",
"is_bot": false,
"headline": "Added a note on deserialization shorthands to README",
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"body": "The KDoc documented the extensions only as shorthands for ObjectMapper methods,\nso the check added in 2.19.0 (#937 / #399) was hard to notice.\nReworded it to state null safety as its purpose.\n\nAlso fixed the following:\n- readValues / readValuesTyped documented the throw on the function itself,\n tho\n[…]\n no KDoc,\n even though it is the only function that does not perform the check.\n- ObjectMapper.treeToValue referred to ObjectMapper.readValue.\n\nCo-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>",
"is_bot": false,
"headline": "Clarified that read functions preserve Kotlin null safety",
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"headline": "Merge remote-tracking branch 'FasterXML/3.2' into 3.x",
"author_name": "wrongwrong",
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"committed_at": "2026-07-18T11:33:58Z",
"body_truncated": false,
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{
"oid": "778eb7395c2dc75f4517ab29b8587d0a1a12ab35",
"body": "…ction\n\nAllow null contents for use-site `in` projections in StrictNullChecks",
"is_bot": false,
"headline": "Merge pull request #1191 from k163377/fix/strict-null-checks-in-proje…",
"author_name": "wrongwrong",
"author_login": "k163377",
"committed_at": "2026-07-18T11:33:18Z",
"body_truncated": false,
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{
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{
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{
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{
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{
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{
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{
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{
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"note": null,
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{
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{
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}
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{
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],
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},
{
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"notes": [],
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{
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{
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{
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{
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{
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]
},
{
"key": "documentation",
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"inputs": {
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"homepage": null,
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{
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{
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"points": 0,
"status": "missed",
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{
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"points": 10,
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{
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{
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}
],
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{
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"components": [
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{
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{
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{
"key": "dangerous_workflow",
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"points": 10,
"status": "met",
"details": [],
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},
{
"key": "dependency_update_tool",
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"detail": "update tool detected",
"points": 7.5,
"status": "met",
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{
"key": "fuzzing",
"name": "Fuzzing",
"detail": "project is not fuzzed",
"points": 0,
"status": "missed",
"details": [],
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{
"key": "license",
"name": "License",
"detail": "license file detected",
"points": 2.5,
"status": "met",
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{
"key": "maintained",
"name": "Maintained",
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"points": 7.5,
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{
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{
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{
"key": "sast",
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{
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{
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"status": "excluded",
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"code": "no_data",
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],
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{
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{
"key": "vulnerabilities",
"name": "Vulnerabilities",
"detail": "0 existing vulnerabilities detected",
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"status": "met",
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"max_points": 7.5
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]
},
{
"key": "dependency_advisories",
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"notes": [
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},
{
"code": "advisories_reachability",
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],
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"direct_affected_packages": 0
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"components": [
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"max_points": 35
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{
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{
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]
},
{
"key": "malicious_dependencies",
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"notes": [],
"value": 100,
"inputs": {
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"components": [
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],
"max_points": 100
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]
},
{
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"notes": [
{
"code": "jurisdiction_evidence_limits",
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],
"value": 100,
"inputs": {
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"exposures": [],
"policy_countries": [
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"review_only_matches": 0,
"assessed_self_published_locations": 17
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"components": [
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"code": "jurisdiction_no_match",
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}
],
"max_points": 100
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]
}
],
"description": "Are visible security and supply-chain practices strong, with no malicious dependency and no unresolved high-risk jurisdiction exposure?"
},
{
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"name": "AI Readiness",
"value": 58,
"weight": 0,
"metrics": [
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"components": [
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"status": "missed",
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],
"max_points": 45
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{
"key": "machine_readable_docs_llms_txt",
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"status": "missed",
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"status": "partial",
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],
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]
},
{
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],
"description": "How well is the repo equipped to be developed and maintained with AI coding agents? An independent, experimental badge — weight 0.0, so it is surfaced on its own and does not affect the overall health score."
}
],
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},
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],
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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 v1.13.0, schema v0.27.0 — full methodology · metrics wiki.
How one result sits in the wider record: aggregate statistics — Maven.