Public record
Software health reportschema 0.34.0 · metrics 2.10.0 · 2026-08-28 07:21 UTC

anthropic-experimental / sandbox-runtime

A lightweight sandboxing tool for enforcing filesystem and network restrictions on arbitrary processes at the OS level, without requiring a container.

TypeScriptApache-2.0★ 5,080 stars⑂ 416 forkssince Oct 2025View on GitHub ↗
KindCommand-line toolLibraryhow this is determined

anthropic-experimental/sandbox-runtime holds a health index of 89 out of 100, placing it in the Excellent band. It scores highest on Vitality (95/100) and lowest on Engineering Quality (64/100). It was last updated 2 days ago. 3 contributors account for most of its recent work.

89
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.

89
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 75 is calibrated to 89 on the published index scale (record calibration 2026-08-02).

Ownership

Anthropic-experimentalOrganization
784 followers3 public repossince Apr 2024

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

Package ecosystems

RegistryPackageVersionDownloads / moVersionsLast publishTags
npm@anthropic-ai/sandbox-runtime0.0.741,239,497701 day agosandboxseatbeltsandbox-execanthropicclaudesecuritybubblewrapnetwork-filteringfilesystem-restrictions

Metrics by category

Vitality

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

95Exceptional · 21% of overall

Development activity

91Excellent
How it's scored
36/36Push recency — last push 2 days ago
27/36Commit cadence — 39/52 weeks with commits
18/18Commit volume — 704 commits in the last year
10/10OpenSSF Scorecard: Maintained — 30 commit(s) and 0 issue activity found in the last 90 days -- score normalized to 10
Inputs used
commits_last_year704
human_commit_share1
days_since_last_push2
active_weeks_last_year39

Release discipline

100Exceptional
How it's scored
27/27Ships releases — 37 releases published
36/36Release recency — latest release 2 days ago
27/27Release cadence — a release every ~5.1 days
0/10OpenSSF Scorecard: Signed-Releases — no data
Inputs used
releases_count37
latest_release_tagv0.0.74
releases_from_tagsno
days_since_latest_release2
mean_days_between_releases5.1
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?

78Good · 17% of overall

Popularity & adoption

89Excellent
How it's scored
60/60Stars — 5,080 stars
21.8/25Forks — 416 forks
7.2/15Watchers — 21 watchers
Inputs used
forks416
stars5,080
watchers21
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 — 1,239,497 downloads/month across npm
0/20Registry dependents — not reported by this ecosystem
Inputs used
packages@anthropic-ai/sandbox-runtime
dependents—
ecosystemsnpm
total_downloads—
monthly_downloads1,239,497
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?

72Good · 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 — 33 contributors
10/10OpenSSF Scorecard: Contributors — project has 10 contributing companies or organizations
Inputs used
bus_factor3
contributors_sampled33
top_contributor_share0.203

Issue & PR responsiveness

56Moderate
How it's scored
12.1/42Issue resolution — 29% of issues closed
24.5/30PR acceptance — 237/290 decided PRs merged
4.3/13Newcomer PR acceptance — 2/6 first-time contributors' PRs merged in 30d
15/15OpenSSF Scorecard: Code-Review — all changesets reviewed
Inputs used
merged_prs237
open_issues87
closed_issues35
prs_merged_7d2
prs_decided_7d4
prs_merged_30d29
prs_decided_30d36
issue_closed_ratio0.287
closed_unmerged_prs53
first_time_authors_30d5
first_time_prs_merged_30d2
first_time_prs_decided_30d6

Ownership & stewardship

60Moderate
How it's scored
30/30Ownership backing — organization-owned
0/20Verified domain
20.8/25Owner reach — 784 followers of anthropic-experimental
9.1/25Track record — 3 public repos, account ~2 yr old
Inputs used
followers784
owner_typeOrganization
is_verifiedno
owner_loginanthropic-experimental
public_repos3
account_age_days864

Package maintenance

100Exceptional
How it's scored
25/25Published & resolvable — 1 package(s) on npm
35/35Publish recency — latest publish 1 days ago
20/20Version history — 70 published versions
20/20Not deprecated — active, not deprecated or yanked
Inputs used
packages@anthropic-ai/sandbox-runtime
ecosystemsnpm
any_deprecatedno
min_days_since_publish1

Engineering Quality

Are baseline engineering and documentation practices in place?

64Moderate · 19% of overall

Engineering practices

80Excellent
How it's scored
24/24CI workflows — 2 workflow(s)
24/24Tests present
16/16Linter config — eslint.config.js, rustfmt.toml
0/9.6Pre-commit hooks
0/6.4.editorconfig
16/20OpenSSF Scorecard: CI-Tests — 16 out of 18 merged PRs checked by a CI test -- score normalized to 8
Inputs used
has_ciyes
has_testsyes
has_editorconfigno
has_linter_configyes
has_precommit_configno

Documentation

40Weak
How it's scored
30/30README
0/25Documentation directory
0/15Documentation / homepage site
10/10Repository description
0/10Topics
0/10Wiki
Inputs used
topics—
has_wikino
homepage—
docs_site—
has_readmeyes
has_docs_dirno
has_descriptionyes

Security

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

66Good · 16% of overall

Security posture

57Moderate
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
2/2.5CI-Tests — 16 out of 18 merged PRs checked by a CI test -- score normalized to 8
0/2.5CII-Best-Practices — no effort to earn an OpenSSF best practices badge detected
7.5/7.5Code-Review — all changesets reviewed
2.5/2.5Contributors — project has 10 contributing companies or organizations
10/10Dangerous-Workflow — no dangerous workflow patterns detected
0/7.5Dependency-Update-Tool — no update tool detected
5/5Fuzzing — project is fuzzed
2.5/2.5License — license file detected
7.5/7.5Maintained — 30 commit(s) and 0 issue activity found in the last 90 days -- score normalized to 10
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
0/5Security-Policy — security policy file not detected
0/7.5Signed-Releases — no data
0/7.5Token-Permissions — detected GitHub workflow tokens with excessive permissions
2.2/7.5Vulnerabilities — 7 existing vulnerabilities detected
Inputs used
sourceopenssf_scorecard
checks_evaluated17
scorecard_versionv5.5.0
checks_inconclusive1
scorecard_aggregate5.7
Excluded from scoring (no data or not applicable): 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_packages4
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 npm:@anthropic-ai/sandbox-runtime@0.0.74 runtime dependency closure — what installing the published package pulls in — 4 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.

68Good · 4% of overall

Agent context & guidance

55Moderate
How it's scored
0/45Agent instructions — no CLAUDE.md / AGENTS.md / editor rules
15/15Machine-readable docs (llms.txt) — llms.txt served by the project website (https://docs.claude.com/llms.txt)
40/40Legible commit history — 77 of 100 human commits state their intent (structured subject or explanatory body)
Inputs used
has_llms_txtyes
llms_txt_urlhttps://docs.claude.com/llms.txt
legible_history_share0.77
agent_instruction_files—
agent_instruction_max_bytes—

Verify loop (build / test / typecheck)

67Good
How it's scored
12.6/18One-command bootstrap — vendor/srt-win-src/Cargo.toml (toolchain convention, no task runner)
22/22Automated tests
11/11Lint / format config — eslint.config.js, rustfmt.toml
11/11Static type checking — tsconfig.json
10/10Reproducible environment — lockfile
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
lockfilesCargo.lock, package-lock.json
has_dockerfileno
typed_languageyes
bootstrap_files—
has_devcontainerno
has_linter_configyes
typecheck_configstsconfig.json
agent_commit_share0
toolchain_manifestsvendor/srt-win-src/Cargo.toml
dependency_bot_commit_share0

Code legibility for models

97Exceptional
How it's scored
45/45Type-checkable code — TypeScript (statically typed)
52/55Manageable file sizes — 6/109 source files over 60KB
Inputs used
primary_languageTypeScript
largest_source_bytes104,351
source_files_sampled109
oversized_source_files6

Key facts

5,080GitHub stars
33contributors
704commits, last 12 months
2days since last push
37releases
3bus factor
87open issues
npmpackage ecosystems

Data collection warnings

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

More detail

Star and fork history 0 ★ / 416 ⇿
0Stars
416Forks
37Releases

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.

0100200300400394242025-102026-032026-08
Major 0Minor 0Patch 37
OpenSSF Scorecard 5.7 / 10
5.7aggregate

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 · 2026-08-28 07:21 UTC

10Binary-Artifactsno binaries found in the repo
5Branch-Protectionbranch protection is not maximal on development and all release branches
8CI-Tests16 out of 18 merged PRs checked by a CI test -- score normalized to 8
0CII-Best-Practicesno effort to earn an OpenSSF best practices badge detected
10Code-Reviewall changesets reviewed
10Contributorsproject has 10 contributing companies or organizations
10Dangerous-Workflowno dangerous workflow patterns detected
0Dependency-Update-Toolno update tool detected
10Fuzzingproject is fuzzed
10Licenselicense file detected
10Maintained30 commit(s) and 0 issue activity found in the last 90 days -- score normalized to 10
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
0Security-Policysecurity policy file not detected
n/aSigned-Releasesno releases found
0Token-Permissionsdetected GitHub workflow tokens with excessive permissions
3Vulnerabilities7 existing vulnerabilities detected
Direct dependencies 4
RegistryPackageVersion constraintManifest
npm@pondwader/socks5-server^1.0.10package.json
npmcommander^12.1.0package.json
npmnode-forge^1.4.0package.json
npmzod^3.24.1package.json
All dependencies 327

Full resolved dependency set from the GitHub dependency graph: 5 direct and 322 indirect (transitive) packages. The transitive closure is complete when the repository commits a lockfile.

RegistryPackageVersionRelation
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npmpossible-typed-array-names1.1.0indirect
npmprelude-ls1.2.1indirect
npmprettier3.3.3indirect
npmprettier-linter-helpers1.0.0indirect
npmpunycode2.3.1indirect
npmpure-rand8.4.0indirect
npmqueue-microtask1.2.3indirect
npmreflect.getprototypeof1.0.10indirect
npmregexp.prototype.flags1.5.4indirect
npmresolve1.22.11indirect
npmresolve-from4.0.0indirect
npmresolve-pkg-maps1.0.0indirect
npmrestore-cursor5.1.0indirect
npmreusify1.1.0indirect
npmrfdc1.4.1indirect
npmrun-parallel1.2.0indirect
npmsafe-array-concat1.1.3indirect
npmsafe-push-apply1.0.0indirect
npmsafe-regex-test1.1.0indirect
npmsemver6.3.1indirect
npmsemver7.7.3indirect
npmset-function-length1.2.2indirect
npmset-function-name2.0.2indirect
npmset-proto1.0.0indirect
npmshebang-command2.0.0indirect
npmshebang-regex3.0.0indirect
npmside-channel1.1.0indirect
npmside-channel-list1.0.0indirect
npmside-channel-map1.0.1indirect
npmside-channel-weakmap1.0.2indirect
npmsignal-exit4.1.0indirect
npmslice-ansi7.1.2indirect
npmstable-hash0.0.5indirect
npmstop-iteration-iterator1.1.0indirect
npmstring-argv0.3.2indirect
npmstring-width7.2.0indirect
npmstring-width8.1.0indirect
npmstring.prototype.trim1.2.10indirect
npmstring.prototype.trimend1.0.9indirect
npmstring.prototype.trimstart1.0.8indirect
npmstrip-ansi7.1.2indirect
npmstrip-bom3.0.0indirect
npmstrip-json-comments3.1.1indirect
npmsupports-color7.2.0indirect
npmsupports-preserve-symlinks-flag1.0.0indirect
npmsynckit0.11.11indirect
npmtapable2.3.0indirect
npmtinyglobby0.2.15indirect
npmto-regex-range5.0.1indirect
npmts-api-utils2.1.0indirect
npmts-declaration-location1.0.7indirect
npmtsconfig-paths3.15.0indirect
npmtslib2.8.1indirect
npmtype-check0.4.0indirect
npmtyped-array-buffer1.0.3indirect
npmtyped-array-byte-length1.0.3indirect
npmtyped-array-byte-offset1.0.4indirect
npmtyped-array-length1.0.7indirect
npmtypescript5.9.3indirect
npmtypescript-eslint8.46.2indirect
npmunbox-primitive1.1.0indirect
npmundici-types5.26.5indirect
npmunrs-resolver1.11.1indirect
npmuri-js4.4.1indirect
npmwhich2.0.2indirect
npmwhich-boxed-primitive1.1.1indirect
npmwhich-builtin-type1.2.1indirect
npmwhich-collection1.0.2indirect
npmwhich-typed-array1.1.19indirect
npmword-wrap1.2.5indirect
npmwrap-ansi9.0.2indirect
npmyaml2.8.3indirect
npmyocto-queue0.1.0indirect
Dependency advisories 0

Installing npm:@anthropic-ai/sandbox-runtime@0.0.74 pulls in 4 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 v0.34.0 — full methodology · metrics wiki.

How one result sits in the wider record: aggregate statistics — npm.