Software health reportschema 0.34.0 · metrics 2.10.0 · 2026-10-20 18:32 UTC

embassy-rs / bt-hci

Rust types for the Bluetooth HCI (Host Controller Interface) specification, and traits for implementing the Controller part of the interface.

RustApache-2.0★ 57 stars⑂ 34 forkssince Feb 2024View on GitHub ↗

KindLibraryhow this is determined

embassy-rs/bt-hci holds a health index of 81 out of 100, placing it in the Excellent band. It scores highest on Vitality (82/100) and lowest on AI Readiness (48/100). It was last updated 12 days ago. 2 contributors account for most of its recent work.

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.

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)

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

embassy-rsOrganization · verified domain

510 followers59 public repossince Mar 2021

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	Tags
crates.io	bt-hci	0.11.0	86,589	18	12 days ago	bluetooth ble hci embedded hardware-support no-std
crates.io	bt-hci-usb	0.2.0	3,306	1	69 days ago	bluetooth ble hci embedded hardware-support
crates.io	bt-hci-linux	0.2.0	87	2	69 days ago	bluetooth ble hci embedded hardware-support
crates.io	bt-hci-serial	0.1.0	94	1	63 days ago	bluetooth ble hci no-std embedded hardware-support
crates.io	bt-hci-transport	0.1.0	31,822	1	78 days ago	bluetooth ble hci hardware-support no-std embedded

Metrics by category

Vitality

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

82Excellent · 21% of overall

Development activity

70Good

How it's scored

28.8/36	Push recency — last push 12 days ago
14.5/36	Commit cadence — 21/52 weeks with commits
16.7/18	Commit volume — 71 commits in the last year
10/10	OpenSSF Scorecard: Maintained — 23 commit(s) and 0 issue activity found in the last 90 days -- score normalized to 10

Inputs used

commits_last_year	71
human_commit_share	1
days_since_last_push	12
active_weeks_last_year	21

Release discipline

100Exceptional

How it's scored

27/27	Ships releases — 20 releases published
36/36	Release recency — latest release 12 days ago
27/27	Release cadence — a release every ~26.6 days
0/10	OpenSSF Scorecard: Signed-Releases — no data

Inputs used

releases_count	20
latest_release_tag	bt-hci-v0.11.0
releases_from_tags	no
days_since_latest_release	12
mean_days_between_releases	26.6

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?

56Moderate · 17% of overall

Popularity & adoption

44Weak

How it's scored

28.4/60	Stars — 57 stars
12.7/25	Forks — 34 forks
2.7/15	Watchers — 4 watchers

Inputs used

forks	34
stars	57
watchers	4
growth_state	unverified
growth_factor_pct	100
growth_unverified_reason	no_history

Community health

50Moderate

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
0/6.3	PR template

Inputs used

has_readme	yes
has_license	yes
readme_badges	0
has_contributing	no
has_issue_template	no
has_code_of_conduct	no
readme_badge_services	—
has_pull_request_template	no

Ecosystem adoption (downloads)

85Excellent

How it's scored

67.8/80	Monthly downloads — 121,898 downloads/month across crates
0/20	Registry dependents — not reported by this ecosystem

Inputs used

packages	bt-hci, bt-hci-usb, bt-hci-linux, bt-hci-serial, bt-hci-transport
dependents	—
ecosystems	crates
total_downloads	973,675
monthly_downloads	121,898
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?

81Excellent · 23% of overall

Maintainer resilience (bus factor)

63Moderate

How it's scored

25.2/54	Bus factor — 2 contributor(s) cover half of all commits
14.7/22.5	Commit distribution — top contributor authored 35% of commits
13.5/13.5	Contributor breadth — 18 contributors
10/10	OpenSSF Scorecard: Contributors — project has 8 contributing companies or organizations

Inputs used

bus_factor	2
contributors_sampled	18
top_contributor_share	0.348

Issue & PR responsiveness

75Good

How it's scored

26.2/42	Issue resolution — 62% of issues closed
28.2/30	PR acceptance — 78/83 decided PRs merged
13/13	Newcomer PR acceptance — 5/5 first-time contributors' PRs merged in 30d
7.5/15	OpenSSF Scorecard: Code-Review — Found 12/21 approved changesets -- score normalized to 5

Inputs used

merged_prs	78
open_issues	9
closed_issues	15
prs_merged_7d	0
prs_decided_7d	0
prs_merged_30d	6
prs_decided_30d	6
issue_closed_ratio	0.625
closed_unmerged_prs	5
first_time_authors_30d	1
first_time_prs_merged_30d	5
first_time_prs_decided_30d	5

Ownership & stewardship

94Exceptional

How it's scored

30/30	Ownership backing — organization-owned
20/20	Verified domain
19.5/25	Owner reach — 510 followers of embassy-rs
24.2/25	Track record — 59 public repos, account ~5 yr old

Inputs used

followers	510
owner_type	Organization
is_verified	yes
owner_login	embassy-rs
public_repos	59
account_age_days	2,057

Package maintenance

100Exceptional

How it's scored

25/25	Published & resolvable — 5 package(s) on crates
35/35	Publish recency — latest publish 12 days ago
20/20	Version history — 18 published versions
20/20	Not deprecated — active, not deprecated or yanked

Inputs used

packages	bt-hci, bt-hci-usb, bt-hci-linux, bt-hci-serial, bt-hci-transport
ecosystems	crates
any_deprecated	no
min_days_since_publish	12

Engineering Quality

Are baseline engineering and documentation practices in place?

62Moderate · 19% of overall

Engineering practices

60Moderate

How it's scored

24/24	CI workflows — 2 workflow(s)
0/24	Tests present
16/16	Linter config — rustfmt.toml
0/9.6	Pre-commit hooks
0/6.4	.editorconfig
20/20	OpenSSF Scorecard: CI-Tests — 17 out of 17 merged PRs checked by a CI test -- score normalized to 10

Inputs used

has_ci	yes
has_tests	no
has_editorconfig	no
has_linter_config	yes
has_precommit_config	no

Documentation

65Good

How it's scored

30/30	README
0/25	Documentation directory
15/15	Documentation / homepage site — https://docs.rs/bt-hci
10/10	Repository description
0/10	Topics
10/10	Wiki

Inputs used

topics	—
has_wiki	yes
homepage	—
docs_site	https://docs.rs/bt-hci
has_readme	yes
has_docs_dir	no
has_description	yes

Security

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

59Moderate · 16% of overall

Security posture

49Weak

How it's scored

7.5/7.5	Binary-Artifacts — no binaries found in the repo
0/7.5	Branch-Protection — branch protection not enabled on development/release branches
2.5/2.5	CI-Tests — 17 out of 17 merged PRs checked by a CI test -- score normalized to 10
0/2.5	CII-Best-Practices — no effort to earn an OpenSSF best practices badge detected
3.8/7.5	Code-Review — Found 12/21 approved changesets -- score normalized to 5
2.5/2.5	Contributors — project has 8 contributing companies or organizations
10/10	Dangerous-Workflow — no dangerous workflow patterns detected
0/7.5	Dependency-Update-Tool — no update tool detected
0/5	Fuzzing — project is not fuzzed
2.5/2.5	License — license file detected
7.5/7.5	Maintained — 23 commit(s) and 0 issue activity found in the last 90 days -- score normalized to 10
5/5	Packaging — packaging workflow detected
0/5	Pinned-Dependencies — dependency not pinned by hash detected -- score normalized to 0
0/5	SAST — SAST tool is not run on all commits -- score normalized to 0
0/5	Security-Policy — security policy file not detected
0/7.5	Signed-Releases — no data
0/7.5	Token-Permissions — detected GitHub workflow tokens with excessive permissions
6/7.5	Vulnerabilities — 2 existing vulnerabilities detected

Inputs used

source	openssf_scorecard
checks_evaluated	17
scorecard_version	v5.5.0
checks_inconclusive	1
scorecard_aggregate	4.8

Excluded from scoring (no data or not applicable): Signed-Releases. Remaining weights renormalized.

Dependency advisories

100Exceptional

How it's scored

35/35	Direct dependencies free of known advisories — no direct dependency carries a known advisory
0/25	Indirect dependencies free of known advisories — transitive set not separable from development and test dependencies in this scope
0/40	No advisories left outstanding — no advisory carries a publication date

Inputs used

source	osv
advisories	2
affected_packages	2
assessed_packages	86
unassessed_packages	18
affected_by_severity	unknown 2
direct_affected_packages	0

Excluded from scoring (no data or not applicable): Indirect dependencies free of known advisories, No advisories left outstanding. Remaining weights renormalized. Matched 86 resolved dependencies against OSV. 18 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.

48Weak · 4% of overall

Agent context & guidance

29At Risk

How it's scored

0/45	Agent instructions — no CLAUDE.md / AGENTS.md / editor rules
0/15	Machine-readable docs (llms.txt)
28.8/40	Legible commit history — 54 of 100 human commits state their intent (structured subject or explanatory body)

Inputs used

has_llms_txt	no
llms_txt_url	—
legible_history_share	0.54
agent_instruction_files	—
agent_instruction_max_bytes	—

Verify loop (build / test / typecheck)

45Weak

How it's scored

12.6/18	One-command bootstrap — Cargo.toml, bt-hci-linux/Cargo.toml, bt-hci-serial/Cargo.toml (toolchain convention, no task runner)
0/22	Automated tests
11/11	Lint / format config — rustfmt.toml
11/11	Static type checking — Rust (statically typed)
10/10	Reproducible environment — lockfile
0/10	Demonstrated agent practice — no agent-authored commits among the last 100
0/8	Automated maintenance — no automated dependency updates observed
0/10	OpenSSF Scorecard: Pinned-Dependencies — dependency not pinned by hash detected -- score normalized to 0

Inputs used

has_nix	no
has_tests	no
lockfiles	Cargo.lock
has_dockerfile	no
typed_language	yes
bootstrap_files	—
has_devcontainer	no
has_linter_config	yes
typecheck_configs	—
agent_commit_share	0
toolchain_manifests	Cargo.toml, bt-hci-linux/Cargo.toml, bt-hci-serial/Cargo.toml, bt-hci-transport/Cargo.toml, bt-hci-usb/Cargo.toml, bt-hci/Cargo.toml
dependency_bot_commit_share	0

Code legibility for models

96Exceptional

How it's scored

45/45	Type-checkable code — Rust (statically typed)
50.9/55	Manageable file sizes — 2/27 source files over 60KB

Inputs used

primary_language	Rust
largest_source_bytes	98,910
source_files_sampled	27
oversized_source_files	2

Key facts

57GitHub stars

18contributors

71commits, last 12 months

12days since last push

20releases

2bus factor

9open issues

crates.iopackage ecosystems

Data collection warnings

Star history unavailable: GitHub GraphQL error: Resource not accessible by personal access token

More detail

Star and fork history 0 ★ / 34 ⇿

0Stars

34Forks

19Releases

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.

Major 0Minor 8Patch 5

Each point covers 3 days.

OpenSSF Scorecard 4.8 / 10

4.8aggregate

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 · 2026-10-20 18:31 UTC

10	Binary-Artifacts	no binaries found in the repo
0	Branch-Protection	branch protection not enabled on development/release branches
10	CI-Tests	17 out of 17 merged PRs checked by a CI test -- score normalized to 10
0	CII-Best-Practices	no effort to earn an OpenSSF best practices badge detected
5	Code-Review	Found 12/21 approved changesets -- score normalized to 5
10	Contributors	project has 8 contributing companies or organizations
10	Dangerous-Workflow	no dangerous workflow patterns detected
0	Dependency-Update-Tool	no update tool detected
0	Fuzzing	project is not fuzzed
10	License	license file detected
10	Maintained	23 commit(s) and 0 issue activity found in the last 90 days -- score normalized to 10
10	Packaging	packaging workflow detected
0	Pinned-Dependencies	dependency not pinned by hash detected -- score normalized to 0
0	SAST	SAST tool is not run on all commits -- score normalized to 0
0	Security-Policy	security policy file not detected
n/a	Signed-Releases	no releases found
0	Token-Permissions	detected GitHub workflow tokens with excessive permissions
8	Vulnerabilities	2 existing vulnerabilities detected

Direct dependencies 28

Registry	Package	Version constraint	Manifest
crates.io	tokio	`1`	bt-hci-linux/Cargo.toml
crates.io	embedded-io	`0.7`	bt-hci-linux/Cargo.toml
crates.io	libc	`0.2`	bt-hci-linux/Cargo.toml
crates.io	bt-hci-transport	`0.1.0`	bt-hci-linux/Cargo.toml
crates.io	bt-hci-transport	`0.1.0`	bt-hci-serial/Cargo.toml
crates.io	embassy-sync	`>=0.7, <0.9`	bt-hci-serial/Cargo.toml
crates.io	embedded-io	`0.7.1`	bt-hci-serial/Cargo.toml
crates.io	embedded-io-async	`0.7.0`	bt-hci-serial/Cargo.toml
crates.io	defmt	`^1`	bt-hci-serial/Cargo.toml
crates.io	embedded-io	`0.7.1`	bt-hci-transport/Cargo.toml
crates.io	embedded-io-async	`0.7.0`	bt-hci-transport/Cargo.toml
crates.io	defmt	`^1`	bt-hci-transport/Cargo.toml
crates.io	bt-hci-transport	`0.1.0`	bt-hci-usb/Cargo.toml
crates.io	embedded-io	`0.7.1`	bt-hci-usb/Cargo.toml
crates.io	futures	`0.3.32`	bt-hci-usb/Cargo.toml
crates.io	nusb	`0.2.3`	bt-hci-usb/Cargo.toml
crates.io	tokio	`1`	bt-hci-usb/Cargo.toml
crates.io	bt-hci-transport	`0.1.0`	bt-hci/Cargo.toml
crates.io	btuuid	`0.1.0`	bt-hci/Cargo.toml
crates.io	defmt	`^1`	bt-hci/Cargo.toml
crates.io	log	`^0.4`	bt-hci/Cargo.toml
crates.io	embedded-io	`0.7.1`	bt-hci/Cargo.toml
crates.io	embedded-io-async	`0.7.0`	bt-hci/Cargo.toml
crates.io	embassy-sync	`>=0.7, <0.9`	bt-hci/Cargo.toml
crates.io	embassy-time	`>=0.3, <0.6`	bt-hci/Cargo.toml
crates.io	heapless	`>=0.8, <0.10`	bt-hci/Cargo.toml
crates.io	futures-intrusive	`0.5.0`	bt-hci/Cargo.toml
crates.io	serde	`^1`	bt-hci/Cargo.toml

All dependencies 104

Full resolved dependency set from the GitHub dependency graph: 31 direct and 73 indirect (transitive) packages. The transitive closure is complete when the repository commits a lockfile.

Registry	Package	Version	Relation
crates.io	bt-hci-transport	`—`	direct
crates.io	btuuid	`—`	direct
crates.io	btuuid	`0.1.1`	direct
crates.io	defmt	`—`	direct
crates.io	defmt	`0.3.100`	direct
crates.io	defmt	`1.1.0`	direct
crates.io	embassy-sync	`—`	direct
crates.io	embassy-sync	`0.8.0`	direct
crates.io	embassy-time	`—`	direct
crates.io	embassy-time	`0.5.1`	direct
crates.io	embedded-io	`—`	direct
crates.io	embedded-io	`0.7.1`	direct
crates.io	embedded-io-async	`—`	direct
crates.io	embedded-io-async	`0.7.0`	direct
crates.io	futures	`—`	direct
crates.io	futures	`0.3.32`	direct
crates.io	futures-intrusive	`—`	direct
crates.io	futures-intrusive	`0.5.0`	direct
crates.io	heapless	`—`	direct
crates.io	heapless	`0.7.17`	direct
crates.io	heapless	`0.9.3`	direct
crates.io	libc	`—`	direct
crates.io	libc	`0.2.186`	direct
crates.io	log	`—`	direct
crates.io	log	`0.4.32`	direct
crates.io	nusb	`—`	direct
crates.io	nusb	`0.2.4`	direct
crates.io	serde	`—`	direct
crates.io	serde	`1.0.228`	direct
crates.io	tokio	`—`	direct
crates.io	tokio	`1.52.3`	direct
crates.io	atomic-polyfill	`1.0.3`	indirect
crates.io	bitflags	`1.3.2`	indirect
crates.io	bitflags	`2.13.0`	indirect
crates.io	byteorder	`1.5.0`	indirect
crates.io	bytes	`1.12.1`	indirect
crates.io	cfg-if	`1.0.4`	indirect
crates.io	cobs	`0.3.0`	indirect
crates.io	core-foundation	`0.10.1`	indirect
crates.io	core-foundation-sys	`0.8.7`	indirect
crates.io	critical-section	`—`	indirect
crates.io	critical-section	`1.2.0`	indirect
crates.io	defmt-macros	`1.1.0`	indirect
crates.io	defmt-parser	`1.0.0`	indirect
crates.io	document-features	`0.2.12`	indirect
crates.io	embassy-executor-timer-queue	`0.1.0`	indirect
crates.io	embassy-time-driver	`0.2.2`	indirect
crates.io	embassy-time-queue-utils	`0.3.2`	indirect
crates.io	embedded-hal	`0.2.7`	indirect
crates.io	embedded-hal	`1.0.0`	indirect
crates.io	embedded-hal-async	`1.0.0`	indirect
crates.io	errno	`0.3.14`	indirect
crates.io	futures-channel	`0.3.32`	indirect
crates.io	futures-core	`0.3.32`	indirect
crates.io	futures-executor	`0.3.32`	indirect
crates.io	futures-io	`0.3.32`	indirect
crates.io	futures-macro	`0.3.32`	indirect
crates.io	futures-sink	`0.3.32`	indirect
crates.io	futures-task	`0.3.32`	indirect
crates.io	futures-test	`—`	indirect
crates.io	futures-test	`0.3.32`	indirect
crates.io	futures-util	`0.3.32`	indirect
crates.io	hash32	`0.2.1`	indirect
crates.io	hash32	`0.3.1`	indirect
crates.io	io-kit-sys	`0.5.0`	indirect
crates.io	linux-raw-sys	`0.12.1`	indirect
crates.io	litrs	`1.0.0`	indirect
crates.io	lock_api	`0.4.14`	indirect
crates.io	mach2	`0.5.0`	indirect
crates.io	memchr	`2.8.2`	indirect
crates.io	mio	`1.2.2`	indirect
crates.io	nb	`0.1.3`	indirect
crates.io	nb	`1.1.0`	indirect
crates.io	once_cell	`1.21.4`	indirect
crates.io	pin-project	`1.1.13`	indirect
crates.io	pin-project-internal	`1.1.13`	indirect
crates.io	pin-project-lite	`0.2.17`	indirect
crates.io	postcard	`—`	indirect
crates.io	postcard	`1.1.3`	indirect
crates.io	proc-macro-error-attr2	`2.0.0`	indirect
crates.io	proc-macro-error2	`2.0.1`	indirect
crates.io	proc-macro2	`1.0.106`	indirect
crates.io	quote	`1.0.45`	indirect
crates.io	rustc_version	`0.4.1`	indirect
crates.io	rustix	`1.1.4`	indirect
crates.io	scopeguard	`1.2.0`	indirect
crates.io	semver	`1.0.28`	indirect
crates.io	serde_core	`1.0.228`	indirect
crates.io	serde_derive	`1.0.228`	indirect
crates.io	signal-hook-registry	`1.4.8`	indirect
crates.io	slab	`0.4.12`	indirect
crates.io	socket2	`0.6.5`	indirect
crates.io	spin	`0.9.8`	indirect
crates.io	stable_deref_trait	`1.2.1`	indirect
crates.io	syn	`2.0.117`	indirect
crates.io	thiserror	`2.0.18`	indirect
crates.io	thiserror-impl	`2.0.18`	indirect
crates.io	tokio-macros	`2.7.0`	indirect
crates.io	unicode-ident	`1.0.24`	indirect
crates.io	uuid	`1.23.3`	indirect
crates.io	void	`1.0.2`	indirect
crates.io	wasi	`0.11.1+wasi-snapshot-preview1`	indirect
crates.io	windows-link	`0.2.1`	indirect
crates.io	windows-sys	`0.61.2`	indirect

Dependency advisories 2

This repository publishes no package the index resolves, so its own dependency graph was assessed — 86 packages, which also include development and test pins that never ship: 2 carry known advisories, of which 0 are direct. 18 could not be assessed — no resolved version, an unsupported ecosystem, or beyond the reported package list.

Package	Version	Relation	Severity	Advisories	Fixed in
atomic-polyfill	`1.0.3`	indirect	unknown	1	—
proc-macro-error2	`2.0.1`	indirect	unknown	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

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.

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 — crates.io.

Software health index

Score profile

Ownership

Package ecosystems

Metrics by category

Key facts

Data collection warnings

More detail

Feedback

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