Public record
Software health reportschema 0.34.0 · metrics 2.10.0 · 2026-09-17 11:46 UTC

jamesmunns / postcard

A no_std + serde compatible message library for Rust

RustApache-2.0★ 1,519 stars⑂ 143 forkssince Apr 2019View on GitHub ↗
KindLibraryhow this is determined

jamesmunns/postcard holds a health index of 71 out of 100, placing it in the Good band. It scores highest on Community & Adoption (72/100) and lowest on AI Readiness (48/100). It was last updated 10 days ago. A single contributor accounts for most of its recent work.

71
overall / 100
Good

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.

71
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 63 is calibrated to 71 on the published index scale (record calibration 2026-08-02).

Ownership

James MunnsPersonal account
1,168 followers350 public repossince Aug 2012@oxidecomputer

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 publishTags
crates.iopostcard1.1.37,939,71040419 days agocobsframingserdeembeddedno-std
crates.iopostcard20.2.118,0633263 days agoserdeembeddedno-std
crates.iopostcard-dyn0.2.11,1723419 days agocobsframingserdeembeddedno-std
crates.iopostcard-core0.1.04,6331262 days agoembeddedno-std
crates.iopostcard2-eio0.2.021263 days agoserdeembeddedno-std
crates.iopostcard-derive0.2.2715,0546419 days agocobsframingserdeembeddedno-std
crates.iopostcard-dyn-ng0.3.051454 days agocobsframingserdeembeddedno-std
crates.iopostcard-schema0.2.553,1577389 days agoserdeembeddedno-std

Metrics by category

Vitality

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

60Moderate · 21% of overall

Development activity

48Weak
How it's scored
28.8/36Push recency — last push 10 days ago
5.5/36Commit cadence — 8/52 weeks with commits
11.3/18Commit volume — 17 commits in the last year
2/10OpenSSF Scorecard: Maintained — 3 commit(s) and 0 issue activity found in the last 90 days -- score normalized to 2
Inputs used
commits_last_year17
human_commit_share1
days_since_last_push10
active_weeks_last_year8

Release discipline

78Good
How it's scored
27/27Ships releases — 27 releases published
16.2/36Release recency — latest release 263 days ago
27/27Release cadence — a release every ~21.2 days
0/10OpenSSF Scorecard: Signed-Releases — no data
Inputs used
releases_count27
latest_release_tagpostcard2/v0.2.0
releases_from_tagsno
days_since_latest_release263
mean_days_between_releases21.2
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?

72Good · 17% of overall

Popularity & adoption

75Good
How it's scored
51.6/60Stars — 1,519 stars
17.9/25Forks — 143 forks
5.3/15Watchers — 10 watchers
Inputs used
forks143
stars1,519
watchers10
growth_stateunverified
growth_factor_pct100
growth_unverified_reasonno_history

Community health

50Moderate
How it's scored
22.5/22.5README
22.5/22.5License — recognized license (Apache-2.0)
0/18CONTRIBUTING guide
0/13.5Code of conduct
0/7.2Issue template
0/6.3PR template
Inputs used
has_readmeyes
has_licenseyes
readme_badges0
has_contributingno
has_issue_templateno
has_code_of_conductno
readme_badge_services—
has_pull_request_templateno

Ecosystem adoption (downloads)

100Exceptional
How it's scored
80/80Monthly downloads — 8,731,796 downloads/month across crates
0/20Registry dependents — not reported by this ecosystem
Inputs used
packagespostcard, postcard2, postcard-dyn, postcard-core, postcard2-eio, postcard-derive, postcard-dyn-ng, postcard-schema
dependents—
ecosystemscrates
total_downloads68,171,348
monthly_downloads8,731,796
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?

66Good · 23% of overall

Maintainer resilience (bus factor)

44Weak
How it's scored
9/54Bus factor — 1 contributor(s) cover half of all commits
11.1/22.5Commit distribution — top contributor authored 51% of commits
13.5/13.5Contributor breadth — 66 contributors
10/10OpenSSF Scorecard: Contributors — project has 11 contributing companies or organizations
Inputs used
bus_factor1
contributors_sampled66
top_contributor_share0.506

Issue & PR responsiveness

68Good
How it's scored
25.5/42Issue resolution — 61% of issues closed
26/30PR acceptance — 129/149 decided PRs merged
0/13Newcomer PR acceptance — no first-time contributor's PR decided in 30d
7.5/15OpenSSF Scorecard: Code-Review — Found 8/15 approved changesets -- score normalized to 5
Inputs used
merged_prs129
open_issues51
closed_issues79
prs_merged_7d0
prs_decided_7d0
prs_merged_30d0
prs_decided_30d0
issue_closed_ratio0.608
closed_unmerged_prs20
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

71Good
How it's scored
10/30Ownership backing — personal (user) account
0/20Verified domain — not applicable to user accounts
22.1/25Owner reach — 1,168 followers of jamesmunns
25/25Track record — 350 public repos, account ~14 yr old
Inputs used
followers1,168
owner_typeUser
is_verified—
owner_loginjamesmunns
public_repos350
account_age_days5,156
Excluded from scoring (no data or not applicable): Verified domain. Remaining weights renormalized.

Package maintenance

91Excellent
How it's scored
25/25Published & resolvable — 8 package(s) on crates
26/35Publish recency — latest publish 262 days ago
20/20Version history — 40 published versions
20/20Not deprecated — active, not deprecated or yanked
Inputs used
packagespostcard, postcard2, postcard-dyn, postcard-core, postcard2-eio, postcard-derive, postcard-dyn-ng, postcard-schema
ecosystemscrates
any_deprecatedno
min_days_since_publish262

Engineering Quality

Are baseline engineering and documentation practices in place?

66Good · 19% of overall

Engineering practices

66Good
How it's scored
24/24CI workflows — 1 workflow(s)
24/24Tests present
0/16Linter config
0/9.6Pre-commit hooks
0/6.4.editorconfig
18/20OpenSSF Scorecard: CI-Tests — 14 out of 15 merged PRs checked by a CI test -- score normalized to 9
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://docs.rs/postcard/
10/10Repository description
0/10Topics
10/10Wiki
Inputs used
topics—
has_wikiyes
homepage—
docs_sitehttps://docs.rs/postcard/
has_readmeyes
has_docs_dirno
has_descriptionyes

Security

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

53Moderate · 16% of overall

Security posture

53Moderate
How it's scored
7.5/7.5Binary-Artifacts — no binaries found in the repo
0/7.5Branch-Protection — no data
2.2/2.5CI-Tests — 14 out of 15 merged PRs checked by a CI test -- score normalized to 9
0/2.5CII-Best-Practices — no effort to earn an OpenSSF best practices badge detected
3.8/7.5Code-Review — Found 8/15 approved changesets -- score normalized to 5
2.5/2.5Contributors — project has 11 contributing companies or organizations
10/10Dangerous-Workflow — no dangerous workflow patterns detected
0/7.5Dependency-Update-Tool — no update tool detected
0/5Fuzzing — project is not fuzzed
2.5/2.5License — license file detected
1.5/7.5Maintained — 3 commit(s) and 0 issue activity found in the last 90 days -- score normalized to 2
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
0/5Security-Policy — security policy file not detected
0/7.5Signed-Releases — no data
7.5/7.5Token-Permissions — GitHub workflow tokens follow principle of least privilege
7.5/7.5Vulnerabilities — 0 existing vulnerabilities detected
Inputs used
sourceopenssf_scorecard
checks_evaluated15
scorecard_versionv5.5.0
checks_inconclusive3
scorecard_aggregate5.3
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.

48Weak · 4% of overall

Agent context & guidance

26At Risk
How it's scored
0/45Agent instructions — no CLAUDE.md / AGENTS.md / editor rules
0/15Machine-readable docs (llms.txt)
26.1/40Legible commit history — 49 of 100 human commits state their intent (structured subject or explanatory body)
Inputs used
has_llms_txtno
llms_txt_url—
legible_history_share0.49
agent_instruction_files—
agent_instruction_max_bytes—

Verify loop (build / test / typecheck)

46Weak
How it's scored
12.6/18One-command bootstrap — Cargo.toml, source/postcard-core/Cargo.toml, source/postcard-derive-ng/Cargo.toml (toolchain convention, no task runner)
22/22Automated tests
0/11Lint / format config
11/11Static type checking — Rust (statically typed)
0/10Reproducible environment
0/10Demonstrated agent practice — no agent-authored commits among the last 100
0/8Automated maintenance — no automated dependency updates observed
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_languageyes
bootstrap_files—
has_devcontainerno
has_linter_configno
typecheck_configs—
agent_commit_share0
toolchain_manifestsCargo.toml, source/postcard-core/Cargo.toml, source/postcard-derive-ng/Cargo.toml, source/postcard-derive/Cargo.toml, source/postcard-dyn-ng/Cargo.toml, source/postcard-dyn/Cargo.toml, source/postcard-schema-ng/Cargo.toml, source/postcard-schema/Cargo.toml, source/postcard/Cargo.toml, source/postcard2-eio/Cargo.toml, source/postcard2-heapless/Cargo.toml, source/postcard2/Cargo.toml
dependency_bot_commit_share0

Code legibility for models

100Exceptional
How it's scored
45/45Type-checkable code — Rust (statically typed)
55/55Manageable file sizes — 0/88 source files over 60KB
Inputs used
primary_languageRust
largest_source_bytes29,106
source_files_sampled88
oversized_source_files0

Key facts

1,519GitHub stars
66contributors
17commits, last 12 months
10days since last push
27releases
1bus factor
51open issues
crates.iopackage ecosystems

Data collection warnings

  • Star history unavailable: GitHub GraphQL error: Resource not accessible by personal access token
  • Runtime dependency closure could not be resolved from deps.dev ([Errno -5] No address associated with hostname); advisories assessed against the repository dependency graph instead
  • No resolved dependencies carried a version and a supported ecosystem

More detail

Star and fork history 0 ★ / 143 ⇿
0Stars
143Forks
27Releases

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.

025507510012515014342019-082023-022026-09
Major 1Minor 0Patch 10

Each point covers 7 days.

OpenSSF Scorecard 5.3 / 10
5.3aggregate

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 · 2026-09-17 11:45 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
9CI-Tests14 out of 15 merged PRs checked by a CI test -- score normalized to 9
0CII-Best-Practicesno effort to earn an OpenSSF best practices badge detected
5Code-ReviewFound 8/15 approved changesets -- score normalized to 5
10Contributorsproject has 11 contributing companies or organizations
10Dangerous-Workflowno dangerous workflow patterns detected
0Dependency-Update-Toolno update tool detected
0Fuzzingproject is not fuzzed
10Licenselicense file detected
2Maintained3 commit(s) and 0 issue activity found in the last 90 days -- score normalized to 2
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
0Security-Policysecurity policy file not detected
n/aSigned-Releasesno releases found
10Token-PermissionsGitHub workflow tokens follow principle of least privilege
10Vulnerabilities0 existing vulnerabilities detected
Direct dependencies 62
RegistryPackageVersion constraintManifest
crates.iosyn2.0source/postcard-derive-ng/Cargo.toml
crates.ioquote1.0source/postcard-derive-ng/Cargo.toml
crates.ioproc-macro21.0source/postcard-derive-ng/Cargo.toml
crates.iosyn2.0source/postcard-derive/Cargo.toml
crates.ioquote1.0source/postcard-derive/Cargo.toml
crates.ioproc-macro21.0source/postcard-derive/Cargo.toml
crates.ioserde1.0.202source/postcard-dyn-ng/Cargo.toml
crates.ioserde_json1.0.117source/postcard-dyn-ng/Cargo.toml
crates.iopostcard1.0.10source/postcard-dyn-ng/Cargo.toml
crates.iopostcard-schema-ng0.3source/postcard-dyn-ng/Cargo.toml
crates.ioserde1.0.202source/postcard-dyn/Cargo.toml
crates.ioserde_json1.0.117source/postcard-dyn/Cargo.toml
crates.iopostcard1.0.10source/postcard-dyn/Cargo.toml
crates.iopostcard-schema0.2source/postcard-dyn/Cargo.toml
crates.ioserde1.0source/postcard-schema-ng/Cargo.toml
crates.iouuid_v1_01.0source/postcard-schema-ng/Cargo.toml
crates.iochrono_v0_40.4source/postcard-schema-ng/Cargo.toml
crates.ioheapless_v0_70.7source/postcard-schema-ng/Cargo.toml
crates.ioheapless_v0_80.8source/postcard-schema-ng/Cargo.toml
crates.ioheapless_v0_90.9source/postcard-schema-ng/Cargo.toml
crates.ionalgebra_v0_330.33.0source/postcard-schema-ng/Cargo.toml
crates.iofixed_v1_01.0source/postcard-schema-ng/Cargo.toml
crates.iopostcard-derive-ng0.3.0source/postcard-schema-ng/Cargo.toml
crates.iodefmt_v0_30.3.5source/postcard-schema-ng/Cargo.toml
crates.ioserde-big-array_v0_50.5.1source/postcard-schema-ng/Cargo.toml
crates.ioenum-map_v3_03.0.0source/postcard-schema-ng/Cargo.toml
crates.ioserde1.0source/postcard-schema/Cargo.toml
crates.iouuid_v1_01.0source/postcard-schema/Cargo.toml
crates.iochrono_v0_40.4source/postcard-schema/Cargo.toml
crates.ioheapless_v0_70.7source/postcard-schema/Cargo.toml
crates.ioheapless_v0_80.8source/postcard-schema/Cargo.toml
crates.ioheapless_v0_90.9source/postcard-schema/Cargo.toml
crates.ionalgebra_v0_330.33.0source/postcard-schema/Cargo.toml
crates.ionalgebra_v0_340.34.1source/postcard-schema/Cargo.toml
crates.iofixed_v1_01.0source/postcard-schema/Cargo.toml
crates.iopostcard-derive0.2.0source/postcard-schema/Cargo.toml
crates.iodefmt_v0_30.3.5source/postcard-schema/Cargo.toml
crates.ioserde-big-array_v0_50.5.1source/postcard-schema/Cargo.toml
crates.ioheapless0.7.0source/postcard/Cargo.toml
crates.ioheapless-v0_80.8.0source/postcard/Cargo.toml
crates.ioheapless-v0_90.9.1source/postcard/Cargo.toml
crates.ioserde1.0.100source/postcard/Cargo.toml
crates.iocobs0.3.0source/postcard/Cargo.toml
crates.iodefmt1source/postcard/Cargo.toml
crates.ioembedded-io-040.4source/postcard/Cargo.toml
crates.ioembedded-io-060.6source/postcard/Cargo.toml
crates.iopostcard-derive0.2.0source/postcard/Cargo.toml
crates.iocrc3.0.1source/postcard/Cargo.toml
crates.ionalgebra_v0_330.33.0source/postcard/Cargo.toml
crates.ioenum-map-v3_03.0.0source/postcard/Cargo.toml
crates.iopostcard20.2.0source/postcard2-eio/Cargo.toml
crates.ioserde_core1.0.228source/postcard2-eio/Cargo.toml
crates.ioembedded_io_v0_70.7.1source/postcard2-eio/Cargo.toml
crates.iopostcard20.2.0source/postcard2-heapless/Cargo.toml
crates.ioserde_core1.0.228source/postcard2-heapless/Cargo.toml
crates.ioheapless_v0_90.9.1source/postcard2-heapless/Cargo.toml
crates.iopostcard-core0.1.0source/postcard2/Cargo.toml
crates.ioserde_core1.0.228source/postcard2/Cargo.toml
crates.iodefmt1source/postcard2/Cargo.toml
crates.iopostcard-derive-ng0.3.0source/postcard2/Cargo.toml
crates.ioserde_derive1.0.228source/postcard2/Cargo.toml
crates.ioserde1.0.228source/postcard2/Cargo.toml
All dependencies 26

Full resolved dependency set from the GitHub dependency graph: 18 direct and 8 indirect (transitive) packages. The transitive closure is complete when the repository commits a lockfile.

RegistryPackageVersionRelation
crates.iocobs—direct
crates.iocrc—direct
crates.iodefmt—direct
crates.ioheapless—direct
crates.iopostcard—direct
crates.iopostcard-core—direct
crates.iopostcard-derive—direct
crates.iopostcard-derive-ng—direct
crates.iopostcard-schema—direct
crates.iopostcard-schema-ng—direct
crates.iopostcard2—direct
crates.ioproc-macro2—direct
crates.ioquote—direct
crates.ioserde—direct
crates.ioserde_core—direct
crates.ioserde_derive—direct
crates.ioserde_json—direct
crates.iosyn—direct
crates.iochrono—indirect
crates.iocriterion—indirect
crates.ioembedded-io—indirect
crates.ioenum-map—indirect
crates.iofixed—indirect
crates.ionalgebra—indirect
crates.ioserde-big-array—indirect
crates.iouuid—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

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.

The message is kept through sign-in.

Related records

Inspected repositories sharing catalogue tags or ecosystems with jamesmunns/postcard. Read them side by side →

83quartiq/miniconfRust serialize/deserialize/access reflection for trees (no_std, no alloc)Excellent96AFLplusplus/LibAFLAdvanced Fuzzing Library - Slot your Fuzzer together in Rust! Scales across cores and machines. For Windows, Android, MacOS, Linux, no_std, ...Exceptional96slint-ui/slintSlint is an open-source declarative GUI toolkit to build native user interfaces for Rust, C++, JavaScript, or Python apps.Exceptional95tracel-ai/burnBurn is a next generation tensor library and Deep Learning Framework that doesn't compromise on flexibility, efficiency and portability.Exceptional94rust-osdev/uefi-rsRusty wrapper for the Unified Extensible Firmware Interface (UEFI). This crate makes it easy to develop Rust software that leverages safe, convenient, and performant abstractions for UEFI functionality.Exceptional94unicode-org/icu4xSolving i18n for client-side and resource-constrained environments.Exceptional

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.