Public record
Software health reportschema 0.31.0 · metrics 2.10.0 · 2026-08-13 02:16 UTC

mcu-tools / mcuboot

Secure boot for 32-bit Microcontrollers!

CApache-2.0★ 2,025 stars⑂ 969 forkssince Dec 2016View on GitHub ↗
KindCommand-line toolLibraryhow this is determined
#bootloader#software#upgrade#microcontrollers#iot#device#device-management

mcu-tools/mcuboot holds a health index of 96 out of 100, placing it in the Exceptional band. It scores highest on Community & Adoption (90/100) and lowest on Security (70/100). It was last updated 1 day ago. 3 contributors account for most of its recent work.

96
overall / 100
Exceptional

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.

96
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 83 is calibrated to 96 on the published index scale (record calibration 2026-08-02).

Ownership

mcu-toolsOrganization
116 followers8 public repossince Aug 2020

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

Package ecosystems

RegistryPackageVersionDownloads / moVersionsLast publish
Gogithub.com/mcu-tools/mcubootv1.10.0-611224 days ago
PyPIimgtool2.4.0882,39146125 days ago

Metrics by category

Vitality

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

88Excellent · 21% of overall

Development activity

97Exceptional
How it's scored
36/36Push recency — last push 1 days ago
33.2/36Commit cadence — 48/52 weeks with commits
18/18Commit volume — 323 commits in the last year
10/10OpenSSF Scorecard: Maintained — 30 commit(s) and 13 issue activity found in the last 90 days -- score normalized to 10
Inputs used
commits_last_year323
human_commit_share1
days_since_last_push1
active_weeks_last_year48

Release discipline

74Good
How it's scored
27/27Ships releases — 1 releases published
27/36Release recency — latest release 111 days ago
12.6/27Release cadence — cadence unknown (single release)
0/10OpenSSF Scorecard: Signed-Releases — no data
Inputs used
releases_count1
latest_release_tagv2.4.0
releases_from_tagsno
days_since_latest_release111
mean_days_between_releases—
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?

90Excellent · 17% of overall

Popularity & adoption

89Excellent
How it's scored
53.6/60Stars — 2,025 stars
24.9/25Forks — 969 forks
10.3/15Watchers — 72 watchers
Inputs used
forks969
stars2,025
watchers72
growth_stateunverified
growth_factor_pct100
growth_unverified_reasonno_history

Community health

85Excellent
How it's scored
22.5/22.5README
22.5/22.5License — recognized license (Apache-2.0)
18/18CONTRIBUTING guide
13.5/13.5Code of conduct
0/7.2Issue template
0/6.3PR template
Inputs used
has_readmeyes
has_licenseyes
readme_badges7
has_contributingyes
has_issue_templateno
has_code_of_conductyes
readme_badge_servicesgithub.com, shields.io
has_pull_request_templateno

Ecosystem adoption (downloads)

99Exceptional
How it's scored
79.3/80Monthly downloads — 882,391 downloads/month across go, pypi
0/20Registry dependents — not reported by this ecosystem
Inputs used
packagesgithub.com/mcu-tools/mcuboot, imgtool
dependents—
ecosystemsgo, pypi
total_downloads—
monthly_downloads882,391
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?

85Excellent · 23% of overall

Maintainer resilience (bus factor)

77Good
How it's scored
36/54Bus factor — 3 contributor(s) cover half of all commits
17.9/22.5Commit distribution — top contributor authored 20% of commits
13.5/13.5Contributor breadth — 99 contributors
10/10OpenSSF Scorecard: Contributors — project has 25 contributing companies or organizations
Inputs used
bus_factor3
contributors_sampled99
top_contributor_share0.204

Issue & PR responsiveness

86Excellent
How it's scored
38.8/42Issue resolution — 92% of issues closed
24.6/30PR acceptance — 1,691/2,059 decided PRs merged
8.1/13Newcomer PR acceptance — 5/8 first-time contributors' PRs merged in 30d
15/15OpenSSF Scorecard: Code-Review — all changesets reviewed
Inputs used
merged_prs1,691
open_issues47
closed_issues564
prs_merged_7d8
prs_decided_7d10
prs_merged_30d20
prs_decided_30d26
issue_closed_ratio0.923
closed_unmerged_prs368
first_time_authors_30d6
first_time_prs_merged_30d5
first_time_prs_decided_30d8

Ownership & stewardship

80Excellent
How it's scored
30/30Ownership backing — organization-owned
0/20Verified domain — verified-domain status not read for this organization
14.9/25Owner reach — 116 followers of mcu-tools
18.9/25Track record — 8 public repos, account ~5 yr old
Inputs used
followers116
owner_typeOrganization
is_verified—
owner_loginmcu-tools
public_repos8
account_age_days2,189
Excluded from scoring (no data or not applicable): Verified domain. Remaining weights renormalized.

Package maintenance

100Exceptional
How it's scored
25/25Published & resolvable — 2 package(s) on go, pypi
35/35Publish recency — latest publish 125 days ago
20/20Version history — 61 published versions
20/20Not deprecated — active, not deprecated or yanked
Inputs used
packagesgithub.com/mcu-tools/mcuboot, imgtool
ecosystemsgo, pypi
any_deprecatedno
min_days_since_publish125

Engineering Quality

Are baseline engineering and documentation practices in place?

84Excellent · 19% of overall

Engineering practices

84Excellent
How it's scored
24/24CI workflows — 10 workflow(s)
24/24Tests present
16/16Linter config — .ruff.toml
0/9.6Pre-commit hooks
0/6.4.editorconfig
20/20OpenSSF Scorecard: CI-Tests — 18 out of 18 merged PRs checked by a CI test -- score normalized to 10
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 — 7 topics
10/10Wiki
Inputs used
topicsbootloader, software, upgrade, microcontrollers, iot, device, device-management
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?

70Good · 16% of overall

Security posture

62Moderate
How it's scored
7.5/7.5Binary-Artifacts — no binaries found in the repo
3.8/7.5Branch-Protection — branch protection is not maximal on development and all release branches
2.5/2.5CI-Tests — 18 out of 18 merged PRs checked by a CI test -- score normalized to 10
0.5/2.5CII-Best-Practices — badge detected: InProgress
7.5/7.5Code-Review — all changesets reviewed
2.5/2.5Contributors — project has 25 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
7.5/7.5Maintained — 30 commit(s) and 13 issue activity found in the last 90 days -- score normalized to 10
0/5Packaging — no data
0.5/5Pinned-Dependencies — dependency not pinned by hash detected -- score normalized to 1
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
0/7.5Vulnerabilities — 43 existing vulnerabilities detected
Inputs used
sourceopenssf_scorecard
checks_evaluated16
scorecard_versionv5.5.0
checks_inconclusive2
scorecard_aggregate6.2
Excluded from scoring (no data or not applicable): Packaging, Signed-Releases. Remaining weights renormalized.

Dependency advisories

100Exceptional
How it's scored
35/35Direct dependencies free of known advisories — no direct dependency carries a known advisory
25/25Indirect dependencies free of known advisories — no indirect dependency carries a known advisory
0/40No advisories left outstanding — no advisory carries a publication date
Inputs used
sourceosv
advisories0
affected_packages0
assessed_packages7
unassessed_packages0
affected_by_severitynone
direct_affected_packages0
Excluded from scoring (no data or not applicable): No advisories left outstanding. Remaining weights renormalized. Matched the pypi:imgtool@2.4.0 runtime dependency closure — what installing the published package pulls in — 7 packages. 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.

71Good · 4% of overall

Agent context & guidance

40Weak
How it's scored
0/45Agent instructions — no CLAUDE.md / AGENTS.md / editor rules
0/15Machine-readable docs (llms.txt)
40/40Legible commit history — 98 of 100 human commits state their intent (structured subject or explanatory body)
Inputs used
has_llms_txtno
llms_txt_url—
legible_history_share0.98
agent_instruction_files—
agent_instruction_max_bytes—

Verify loop (build / test / typecheck)

73Good
How it's scored
18/18One-command bootstrap — boot/cypress/Makefile, ext/tinycrypt/Makefile, ext/tinycrypt/lib/Makefile, ext/tinycrypt/tests/Makefile, samples/zephyr/Makefile, testplan/mynewt/Makefile
22/22Automated tests
11/11Lint / format config — .ruff.toml
11/11Static type checking — C (statically typed)
10/10Reproducible environment — Dockerfile, lockfile
0/10Demonstrated agent practice — no agent-authored commits among the last 100
0/8Automated maintenance — no automated dependency updates observed
1/10OpenSSF Scorecard: Pinned-Dependencies — dependency not pinned by hash detected -- score normalized to 1
Inputs used
has_nixno
has_testsyes
lockfilesCargo.lock, Gemfile.lock
has_dockerfileyes
typed_languageyes
bootstrap_filesboot/cypress/Makefile, ext/tinycrypt/Makefile, ext/tinycrypt/lib/Makefile, ext/tinycrypt/tests/Makefile, samples/zephyr/Makefile, testplan/mynewt/Makefile
has_devcontainerno
has_linter_configyes
typecheck_configs—
agent_commit_share0
toolchain_manifestsCargo.toml, go.mod, ptest/Cargo.toml, sim/Cargo.toml, sim/mcuboot-sys/Cargo.toml, sim/simflash/Cargo.toml
dependency_bot_commit_share0

Code legibility for models

99Exceptional
How it's scored
45/45Type-checkable code — C (statically typed)
54.2/55Manageable file sizes — 6/416 source files over 60KB
Inputs used
primary_languageC
largest_source_bytes1,579,035
source_files_sampled416
oversized_source_files6

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 — samples
Inputs used
example_dirssamples
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

2,025GitHub stars
99contributors
323commits, last 12 months
1days since last push
1releases
3bus factor
47open issues
crates.io, Go, PyPI, RubyGemspackage ecosystems

Data collection warnings

  • Star history unavailable: GitHub GraphQL error: Resource not accessible by personal access token
  • First-time contributor figures cover 12 of 14 authors (cap 12)
  • Could not fetch crates package 'bootsim' from its registry
  • Could not fetch crates package 'ptest' from its registry

More detail

Star and fork history 0 ★ / 969 ⇿
0Stars
969Forks
1Releases

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.

02004006008001,000827112017-012021-102026-08
Major 0Minor 1Patch 0

Each point covers 9 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 · 2026-08-13 02:16 UTC

10Binary-Artifactsno binaries found in the repo
5Branch-Protectionbranch protection is not maximal on development and all release branches
10CI-Tests18 out of 18 merged PRs checked by a CI test -- score normalized to 10
2CII-Best-Practicesbadge detected: InProgress
10Code-Reviewall changesets reviewed
10Contributorsproject has 25 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 13 issue activity found in the last 90 days -- score normalized to 10
n/aPackagingpackaging workflow not detected
1Pinned-Dependenciesdependency not pinned by hash detected -- score normalized to 1
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
0Vulnerabilities43 existing vulnerabilities detected
Direct dependencies 25
RegistryPackageVersion constraintManifest
crates.iochrono0.4ptest/Cargo.toml
crates.ioenv_logger0.9.0ptest/Cargo.toml
crates.iofailure0.1.8ptest/Cargo.toml
crates.iolog0.4.17ptest/Cargo.toml
crates.ionum_cpus1.13.1ptest/Cargo.toml
crates.iostd-semaphore0.1ptest/Cargo.toml
crates.ioyaml-rust0.4ptest/Cargo.toml
crates.ioclap4.0ptest/Cargo.toml
crates.iobyteorder1.4sim/Cargo.toml
crates.iolibc0.2sim/Cargo.toml
crates.iorand0.9sim/Cargo.toml
crates.iodocopt1.1.0sim/Cargo.toml
crates.ioserde1.0sim/Cargo.toml
crates.ioserde_derive1.0sim/Cargo.toml
crates.iolog0.4sim/Cargo.toml
crates.ioenv_logger0.9sim/Cargo.toml
crates.iosimflash—sim/Cargo.toml
crates.iomcuboot-sys—sim/Cargo.toml
crates.ioring0.16.11sim/Cargo.toml
crates.iountrusted0.9sim/Cargo.toml
crates.iopem1.0sim/Cargo.toml
crates.iocipher0.3sim/Cargo.toml
crates.ioaes0.7.4sim/Cargo.toml
crates.iobase640.13.0sim/Cargo.toml
crates.iotypenum1.13.0sim/Cargo.toml
All dependencies 240

Full resolved dependency set from the GitHub dependency graph: 40 direct and 200 indirect (transitive) packages. The transitive closure is complete when the repository commits a lockfile.

RegistryPackageVersionRelation
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crates.iocipher—direct
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crates.ioclap4.1.11direct
crates.iodocopt—direct
crates.iodocopt1.1.1direct
crates.ioenv_logger—direct
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crates.iofailure0.1.8direct
crates.iolibc—direct
crates.iolibc0.2.126direct
crates.iolibc0.2.185direct
crates.iolog—direct
crates.iolog0.4.16direct
crates.iolog0.4.17direct
crates.ionum_cpus1.13.1direct
crates.iopem—direct
crates.iopem1.0.2direct
crates.iorand—direct
crates.iorand0.8.5direct
crates.iorand0.9.3direct
crates.ioring—direct
crates.ioring0.16.20direct
crates.ioserde—direct
crates.ioserde1.0.136direct
crates.ioserde_derive—direct
crates.ioserde_derive1.0.136direct
crates.iostd-semaphore0.1.0direct
crates.iotypenum—direct
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crates.iountrusted—direct
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crates.ioautocfg1.1.0indirect
crates.iobacktrace0.3.65indirect
crates.iobitflags2.5.0indirect
crates.iobumpalo3.12.0indirect
crates.iocc—indirect
crates.iocc1.0.73indirect
crates.iocc1.2.60indirect
crates.iocfg-if1.0.0indirect
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RubyGemsjekyll-theme-minimal0.2.0indirect
RubyGemsjekyll-theme-modernist0.2.0indirect
RubyGemsjekyll-theme-primer0.6.0indirect
RubyGemsjekyll-theme-slate0.2.0indirect
RubyGemsjekyll-theme-tactile0.2.0indirect
RubyGemsjekyll-theme-time-machine0.2.0indirect
RubyGemsjekyll-titles-from-headings0.5.3indirect
RubyGemsjekyll-watch2.2.1indirect
RubyGemsjemoji0.12.0indirect
RubyGemskramdown2.3.2indirect
RubyGemskramdown-parser-gfm1.1.0indirect
RubyGemsliquid4.0.4indirect
RubyGemslisten3.8.0indirect
RubyGemsmercenary0.3.6indirect
RubyGemsmini_portile22.8.6indirect
RubyGemsminima2.5.1indirect
RubyGemsminitest5.19.0indirect
RubyGemsnokogiri1.16.5indirect
RubyGemsoctokit4.25.1indirect
RubyGemspathutil0.16.2indirect
RubyGemspublic_suffix4.0.7indirect
RubyGemsracc1.7.3indirect
RubyGemsrb-fsevent0.11.2indirect
RubyGemsrb-inotify0.10.1indirect
RubyGemsrexml3.2.8indirect
RubyGemsrouge3.26.0indirect
RubyGemsruby2_keywords0.0.5indirect
RubyGemsrubyzip2.3.2indirect
RubyGemssafe_yaml1.0.5indirect
RubyGemssass3.7.4indirect
RubyGemssass-listen4.0.0indirect
RubyGemssawyer0.9.2indirect
RubyGemssimpleidn0.2.1indirect
RubyGemsstrscan3.1.0indirect
RubyGemsterminal-table1.8.0indirect
RubyGemstyphoeus1.4.0indirect
RubyGemstzinfo2.0.6indirect
RubyGemsunf0.1.4indirect
RubyGemsunf_ext0.0.8.2indirect
RubyGemsunicode-display_width1.8.0indirect
RubyGemswebrick1.8.1indirect
Dependency advisories 0

Installing pypi:imgtool@2.4.0 pulls in 7 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.

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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 v0.31.0 — full methodology · metrics wiki.

How one result sits in the wider record: aggregate statistics — Go, PyPI.