Borehole · Risk register · free tier
fluxml/flux.jl
Free reading: not for reliance
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b617b33 · 5,103 commits · 181 files
Issued 2026-10-04

Nothing significant. Questions worth asking about Organization & Key-Person Risk, Security & Reliability Posture.

106 checks ran across 6 assessable dimensions. None found a significant problem; 2 raised something worth a question. 6 findings, each with evidence. One dimension cannot be assessed without an acquirer.

strong adequate significant findings not assessable from a repository
Provenance disclosure does not affect any rating
13% of the code standing today was written in AI-declared commits
13% of lines still in the tree 4,054 of 30,563 5% of lines ever added these differ when early hand-written code has since been replaced
69% of lines added in the last 12 months (since 2025-10-04) arrived in AI-declared commits: 24/81 commits, confidence low. Also a floor.
24/4,254 commits declaring an agent · Claude
confidence: low
  • 7% of non-merge commits carry any trailer at all
  • low trailer coverage: the convention may not be in consistent use
  • no widespread author/committer date divergence
  • the declared share is neither decisive nor negligible, so the true figure is more sensitive to undeclared work
  • deep scan blamed 181 of 181 counted files
This is a lower bound. It counts what the repository declares. Undeclared AI authorship is invisible here, and a single rebase removes the trailers this rests on. Absence of a declaration is absence of disclosure, not absence of AI authorship.

Architecture & Codebase — including AI provenance

01 · strong · ratings ↑

No finding. 11 checks ran and none fired; the rejection log below says why each did not.

Engineering Process & SDLC Maturity

02 · strong · ratings ↑

No finding. 16 checks ran and none fired; the rejection log below says why each did not.

Organization & Key-Person Risk

03 · adequate · ratings ↑
03.1

Bus factor 1: recent work is concentrated in one contributor

adequate

In the last 24 months, one contributor authored more than half of 157 non-merge commits among 32 authors; across all history, a quarter or more of 4,198. In a project with 32 recent contributors and 10 years of history, that is a question about one person's role rather than a fragile team — but it is the question to ask.

Evidence
git shortlog -sn last 24 months: top author more than half of 157 commits; bus factor 1; 32 authors
Respond to this finding

Your response is published beside the finding, not instead of it. A finding you can argue with is the point — and a wrong one is calibration data we want.

An owner's response is removed only when it is unlawful, impersonates someone, publishes personal data or a credential, or is not about the finding. Disagreeing with the report is never a reason. To report a response, or to reach us about one, write to takedown@borehole.dev.

03.5

The contributor who wrote a quarter or more of this has not committed here for more than three years

adequate

One person authored a quarter or more of 4,198 commits and has not committed here for more than three years, while the repository has kept moving. The concentration figure alone would not show this. Whoever is changing this code now is not the person who wrote most of it, which is the situation an acquirer is usually told they are avoiding. The history shows only that no commits of theirs landed here, not why.

Evidence
last-commit-by-top-author last commit more than three years ago, measured to the survey
git shortlog -sn top author a quarter or more of 4,198 commits
Respond to this finding

Your response is published beside the finding, not instead of it. A finding you can argue with is the point — and a wrong one is calibration data we want.

An owner's response is removed only when it is unlawful, impersonates someone, publishes personal data or a credential, or is not about the finding. Disagreeing with the report is never a reason. To report a response, or to reach us about one, write to takedown@borehole.dev.

03.26

The bus factor fell from 4 to 1

adequate

Year by year, newest first, the number of people who wrote half the changes was 1, 1, 4, 3. The team narrowed to one person, which is a different risk from one that always was: the code does not say why.

Evidence
bus factor by year 1, 1, 4, 3
Respond to this finding

Your response is published beside the finding, not instead of it. A finding you can argue with is the point — and a wrong one is calibration data we want.

An owner's response is removed only when it is unlawful, impersonates someone, publishes personal data or a credential, or is not about the finding. Disagreeing with the report is never a reason. To report a response, or to reach us about one, write to takedown@borehole.dev.

03.27

Regular contributors fell from 5 to 2 in a year

adequate

3 people who committed regularly the year before made no commits in the last year, and 1 new regular contributors arrived. Ask whether the work they did is still covered.

Evidence
regular contributors by year 5 then 2; 3 stopped committing, 1 began
Respond to this finding

Your response is published beside the finding, not instead of it. A finding you can argue with is the point — and a wrong one is calibration data we want.

An owner's response is removed only when it is unlawful, impersonates someone, publishes personal data or a credential, or is not about the finding. Disagreeing with the report is never a reason. To report a response, or to reach us about one, write to takedown@borehole.dev.

Product & Engineering Maturity

04 · strong · ratings ↑

No finding. 19 checks ran and none fired; the rejection log below says why each did not.

Security & Reliability Posture

05 · adequate · ratings ↑
05.10

Licence text does not match a standard licence

adequate

LICENSE.md exists but its text does not match any standard licence. A bespoke or hand-edited licence is not wrong, but it cannot be cleared by recognising its name: counsel has to read it, and until they do neither side knows precisely what rights transfer with the code.

Evidence
LICENSE.md LICENSE.md:1 — 22 lines, unrecognised
Respond to this finding

Your response is published beside the finding, not instead of it. A finding you can argue with is the point — and a wrong one is calibration data we want.

An owner's response is removed only when it is unlawful, impersonates someone, publishes personal data or a credential, or is not about the finding. Disagreeing with the report is never a reason. To report a response, or to reach us about one, write to takedown@borehole.dev.

A note that does not affect this rating
05.27

The build runs third-party code it does not pin

adequate

6 third-party CI actions are referenced by a tag or branch rather than a commit, so they run whatever that tag points to on the day. Tags have been moved to malicious commits in real supply-chain attacks, and a piped script is whatever the server returns that minute. Pinning to a commit is the fix, and it is small.

A note that does not affect this rating: notes like it are common in well-run projects.

Evidence
.github/workflows/ci.yml .github/workflows/ci.yml:45 — action pinned by tag
.github/workflows/ci.yml .github/workflows/ci.yml:49 — action pinned by tag
Respond to this finding

Your response is published beside the finding, not instead of it. A finding you can argue with is the point — and a wrong one is calibration data we want.

An owner's response is removed only when it is unlawful, impersonates someone, publishes personal data or a credential, or is not about the finding. Disagreeing with the report is never a reason. To report a response, or to reach us about one, write to takedown@borehole.dev.

Observability & Operations

06 · not assessable · ratings ↑

Not rated: only 4 of 16 checks could reach a conclusion here; the rest do not apply to this repository or could not read it. What a person adds here.

Fit with the Acquirer

07 · not assessable · ratings ↑

Not rated: structurally not assessable from a repository. What a person adds here.

Check it on the running system

1 check against the running system follow from the findings above: what a buyer's engineer will try, how to run it first, and what to have ready. A paid survey of this repository includes them. See the tiers.

A paid survey of a public repository is also reviewed: a language model reads each finding against the code and withdraws only findings it judges the code contradicts, each listed with its reason. The review is a language model's reading of the findings against the code, and it can be wrong. It never adds a finding, never raises a band, and never removes a finding from a proven check or an advisory that affects the surveyed version.

What a person adds

The survey reads what the repository can show. The code cannot settle these questions, and on them this report states nothing. Each says where its answer lives: your own engineer, the company, or an assessor you choose can settle it. Questions marked measured open with something this repository shows.

Architecture & Codebase — including AI provenance

01 · full coverage
  1. Is the architecture right for the next three years of the product? Answer lives in: Your architects, with the product roadmap01.39
  2. Were the home-grown components reasonable choices when they were made, and are they now? Answer lives in: The team's reasoning at the time01.40

Engineering Process & SDLC Maturity

02 · high coverage
  1. Is review real or a rubber stamp? Comment depth and time to approve need the pull request history. Answer lives in: The code host's pull request data02.32
  2. Is delivery planned and measured, or heroic? Answer lives in: The issue tracker: backlog, sprint history, estimate accuracy02.38
  3. How are incidents run, reviewed and learned from? Answer lives in: Tickets, chat and postmortems02.37

Organization & Key-Person Risk

03 · partial coverage
  1. measured 265 people have committed here. Which of them are you acquiring, and which are you replacing? Answer lives in: The deal terms03.29
  2. Who mentors whom, and would that survive a departure? Answer lives in: The team; review history only suggests candidates03.28
  3. Can the team grow, and who stands behind the top three contributors? Answer lives in: Recruiting data and the org chart03.30
  4. Is the seniority mix sound, and will pay survive your salary bands? Answer lives in: HR data03.31
  5. Is the pace sustainable? Commit times cannot say: git keeps no reliable local time. Answer lives in: Interviews and on-call history03.14
  6. Does the team want to stay after close? Answer lives in: Interviews03.32
  7. How are decisions made and disagreements resolved? Answer lives in: Time with the team03.33

Product & Engineering Maturity

04 · minimal coverage
  1. Can this team deliver the stated roadmap on the stated timeline? Answer lives in: The data room and the team's record of estimates04.32
  2. Does leadership know about the debt, and is time budgeted to repay it? Answer lives in: Budget and roadmap decisions04.31
  3. Is the engineering shape consistent with the commercial story? Answer lives in: Revenue, customer and churn data04.33

Security & Reliability Posture

05 · partial coverage
  1. What has actually broken, how often, and how badly? Answer lives in: Ticketing and chat05.41
  2. What did external testing find, and was it fixed? Answer lives in: Reports in the data room05.42
  3. What is the SOC 2, ISO 27001 or GDPR status, and where is the evidence? Answer lives in: Audit reports; policy files in the tree are not evidence05.44

Observability & Operations

06 · partial coverage

Not rated: only 4 of 16 checks could reach a conclusion here; the rest do not apply to this repository or could not read it.

  1. Are the dashboards opened, the alerts acknowledged and the pages answered? Answer lives in: Pager history and dashboard logs06.29
  2. Are the service-level objectives actually met? Answer lives in: Production metrics06.30
  3. Who carries the pager, and how often does it go off? Answer lives in: Pager exports and interviews06.31
  4. What does it cost to run, and how much headroom is there? Answer lives in: Cloud billing and capacity plans06.32

Fit with the Acquirer

07 · none coverage

Not rated: structurally not assessable from a repository.

  1. The bulk of this system sits in src/, perf/, ext/. Which of your existing systems would each of those have to absorb or replace? 07.10
  2. 69% of lines added in the last 12 months (5% of added lines) came through AI-declared commits. Does your organisation have a policy on inheriting and maintaining that code, and does your engineering team's tooling match how it was produced? 07.9
  3. Nothing in the repository says how this is deployed. Is it shipped as a library, a binary or a service, and if it runs somewhere, who owns that environment? 07.2
  4. What is your tolerance for the findings above remaining unaddressed for the first two quarters after close, given everything else that will compete for this team's time?
  5. Which of these systems duplicate yours, and which get retired? Answer lives in: Your architecture07.11
  6. What will integration cost, and in what order? Answer lives in: The engagement07.12
  7. Where does the team land in your organisation, and who reports to whom? Answer lives in: Your org design07.13
  8. Are there earn-outs, retention packages or contractor IP to assign? Answer lives in: Deal terms07.14
  9. Do customer contracts limit hosting, regions or vendors? Answer lives in: Customer contracts07.15

A human assessment is Borehole's own paid service, €12,000+ (total price is determined per engagement; travel billed at cost). It is not independent of this report: the same business produced both. It is a separate contract, with its own scope, terms and reliance.

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Rejection log — 100 signals that ran and did not fire

Appendix: rejection log — 100 signals that ran and did not fire

Published on purpose. A signal that looked and decided not to fire has told you something, and this is the calibration data behind every threshold above.

Looked, and found nothing — 56

SignalWhat it found
04.hotspot_concentration change is spread across the codebase rather than pooling in a few filesfiles 541 · top5 share 0.166
04.debt_markers debt markers are sparsemarkers 11 · per kloc 0.43 · lines read 25,867
04.test_growth test effort kept pace with code writtenlate test per code 0.495 · early test per code 0.351
04.churn_trend rework is not rising against new worklate delete per insert 0.747 · early delete per insert 0.78
04.fixes_with_tests fixes usually come with a testfixes 40 · share 0.4 · with tests 16
06.telemetry_presence this repository does not deploy a running service, so instrumentation is not expected of itbasis nothing in this repository deploys a long-running server; if it runs as one, its deployment lives elsewhere · files read 167
06.healthcheck_presence not a running service, so a health endpoint is not expectedbasis nothing in this repository deploys a long-running server; if it runs as one, its deployment lives elsewhere
06.usage_reporting_default the product's code names no reporting hostsettings on 0 · settings off 0
06.migrate_on_start migrations do not run at container start
03.active_contributors more than one contributor active in the trailing yearall time 265 · active 12mo 14
03.knowledge_silos every substantial directory has been touched by more than one personauthors 265 · directories 5
03.drive_by_contributors an open contributor base, where one-commit contributors are normalauthors 265 · one off share 0.392
03.critical_path_ownership more than one person changes the critical pathsauthors 32
03.second_contributor_attrition the second and third contributors are still active
02.merge_discipline a meaningful share of recent change carries evidence of reviewmerges 4 · window last 24 months · with tracked 1
02.ci_presence CI configuration is present in the working treecount 7
02.test_presence tests are present in a normal proportion to sourcetests 53 · source 97 · test ratio 0.546
02.release_cadence tags are presenttags 121
02.conventional_commits commit subjects generally carry contentsampled 4,254 · low content share 0.156
02.branch_protection_hints process scaffolding is present in the repository
02.ci_runs_tests CI invokes a test runnerconfigs 7 · with tests 1
02.skipped_tests few tests are switched offfocused 0 · skipped 0 · test files 54
02.ci_test_gating no test run in CI is written so that it cannot failconfigs 7
02.revert_share change is rarely undoneshare 0.0 · reverts 0 · recent commits 157
02.flaky_test_markers tests are not retried until they passtest retries 0 · suite retries 0
02.commit_size changes arrive in reviewable sizesshare 0.0 · commits 146 · over 2000 lines 0
01.burst_import no commit run met both the rate and the net-addition thresholdgap seconds 180 · min add ratio 3.0 · min net added 2,000
01.initial_dump first commit is not a disproportionate share of the codebaseinsertions 0 · share of insertions 0.0
01.message_uniformity commit subjects vary in wording and lengthlength stdev 15.28 · repeat share 0.169
01.revision_depth most files were revisited after they were first writtenfiles seen 56 · write once share 0.089
01.oversized_modules no module is an outlier against this codebase's own normlargest 968 · threshold 1,000 · median lines 87
01.duplicated_blocks little shipping code is repeated verbatim across filesshare 0.0041 · product files 44 · distinct blocks 7,028
01.unfinished_migration no language migration is stalled halfway
01.weights_in_git no model weights are committedfiles 0
05.committed_secrets no credential-shaped strings outside test and fixture pathsnote the working tree only; the history is 05.5 · patterns 8 · files read 167
05.security_guardrails at least one standard guard rail is configured
05.license_present a licence file is presentfound True
05.secrets_in_history no credential-shaped string was ever added outside test and fixture pathspatterns 8 · truncated False · added lines 76,398
05.secrets_management_pattern no environment file is committed outside tests and examplesenv files 0
05.privileged_workloads no workload runs privileged or in the host's namespacessites 0 · behind a setting or built here 0
05.credentials_in_deploy_config deployment configuration references secrets, never holds themfiles 0 · sites 0
05.signing_material no signing keystore or profile is committedfiles 0
05.license_vendored_unlicensed no vendored third-party code is committedcomponents 0
05.committed_native_libraries no widely used compiled library is committed to the productlibraries 0
04.dependency_churn few dependencies were added and dropped within 60 daysdependencies seen 4 · added in two years 4 · removed within 60 days 0
04.ci_platforms_dropped no platform was dropped from CI in the last two years
04.repository_status the README's first screen states no end, move or freezestatements 0
02.development_elsewhere nothing says development happens elsewhereno pr statements 0 · mirror statements 0 · replayed commit share 0.0
05.licence_changes the root licence has not changed in the history readlicence versions 0 · unreleased changes 0
05.paid_edition no directory carries a separate paid-edition licencedirectories 0
04.releases_stopped releases keep pace with developmentmedian gap days 42.0 · days since last tag 20 · commits last 90 days 40
04.release_branch the newest release was cut from the branch surveyedelsewhere 7 · on branch 113 · tags in window 120
03.single_maintainer no file says one person maintains itstatements 0
05.project_advisories no published advisory affects the surveyed versionaffecting 0 · exploited 0 · advisories 0
05.advisory_record no advisory against the project in the last 24 monthscritical 0 · affecting 0 · could not tell 0
05.project_exploited no affecting advisory is on CISA's Known Exploited listexploited 0

Could not conclude, or did not apply — 44

Not a clean result. Each says why it could not answer here.

SignalWhy
04.dependency_sprawlno dependency manifest of the product's own was found
04.eol_runtimeno pinned runtime version to check
04.fix_share_trendfewer than six busy quarters to compare
04.schema_churnno schema migrations to read
04.compat_layersa library, whose compatibility code is usually deliberate
04.dependency_redundancyno JavaScript manifest to read
06.structured_loggingnot assessed for Julia, the language the product is written in: this check's patterns read other languages only
06.telemetry_depthnot expected of it: nothing in this repository deploys a long-running server; if it runs as one, its deployment lives elsewhere
06.print_loggingnot expected of it: nothing in this repository deploys a long-running server; if it runs as one, its deployment lives elsewhere
06.correlation_idsnot expected of it: nothing in this repository deploys a long-running server; if it runs as one, its deployment lives elsewhere
06.error_reportingnot expected of it: nothing in this repository deploys a long-running server; if it runs as one, its deployment lives elsewhere
06.alert_rulesnot expected of it: nothing in this repository deploys a long-running server; if it runs as one, its deployment lives elsewhere
06.deployed_image_floatsnot expected of it: nothing in this repository deploys a long-running server; if it runs as one, its deployment lives elsewhere
06.probes_identicalno Kubernetes probes
06.single_replicano Kubernetes deployments
06.environment_branchingnot expected of it: nothing in this repository deploys a long-running server; if it runs as one, its deployment lives elsewhere
06.release_markersnot expected of it: nothing in this repository deploys a long-running server; if it runs as one, its deployment lives elsewhere
06.feature_flagsno feature-flag service; flags may live elsewhere
02.dependency_update_cadenceno lockfile to date
02.lint_in_buildtoo small, or no CI to wire a linter into (02.2)
02.long_lived_branchestoo few merges to judge (squash and rebase leave none)
01.swallowed_errorsnot assessed for Julia, the language the product is written in: this check's patterns read other languages only
01.build_reproducibilityno product Dockerfile to read
01.notebook_outputsnot a data or machine-learning repository
05.dependency_pinningno manifest whose pinning can be read without a lockfile
05.container_runs_as_rootno Dockerfile to read
05.outbound_timeoutsnot a running service
05.migration_reversibilitytoo few migrations to judge
05.sql_from_stringsnot a running service; a library that builds SQL is doing its job
05.shell_from_stringsnot assessed for Julia, the language the product is written in: this check's patterns read other languages only
05.unsafe_deserializationnot assessed for Julia, the language the product is written in: this check's patterns read other languages only
05.tls_verification_offnot assessed for Julia, the language the product is written in: this check's patterns read other languages only
05.resource_limitsno Kubernetes workload manifests
05.known_vulnerabilitiesno lockfile this survey can read, or a collector older than 0.4.0
05.public_env_secretnot a frontend
05.unsafe_htmlnot a frontend
05.source_maps_shippednot a frontend
05.cleartext_trafficnot a mobile app
05.dataset_provenancenot a data or machine-learning repository
05.license_copyleft_inheritedno third-party code is committed to this repository, so the licences it depends on are resolved at build time and are not readable here
05.license_manifest_conflictno packaging manifest states a licence
04.flags_accumulatingfew or no feature flags in the history
04.api_versions_coexistingnot a running service
04.deprecations_lingeringa library, which keeps deprecated interfaces for its users
BOREHOLE READING NOT A CERTIFICATION ER7X-RAAE-C6EJ 2026-10-04 · B617B33 BOREHOLE.DEV/VERIFY

Anyone can check this report against the authoritative record — click the stamp, or enter ER7X-RAAE-C6EJ at borehole.dev/verify.

The code commits to the 106 checks this run performed, the bands they produced, and the commit they were read at. It does not cover checks written since.

Put the mark in your README

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[![Borehole reading, not a certification](https://borehole.dev/badge/fluxml/flux.jl/b617b33.svg "Borehole free reading: not for reliance. See the full report.")](https://borehole.dev/verify/ER7XRAAEC6EJ?via=badge)

Borehole reading ER7X-RAAE-C6EJ, not a certification

This commit has been surveyed 5 times

A survey is a reading by a particular version of the assessor. Older readings are kept rather than replaced, because a verification mark attests to the survey it was issued for — overwriting one would make every code already in circulation read as tampered.

ReadAssessorFindingsBand
2026-10-04 · shown borehole 0.7.13 6 adequate
4 earlier (show)
2026-10-03 borehole 0.7.12 6 adequate
2026-10-03 borehole 0.7.11 6 adequate
2026-10-02 borehole 0.7.10 6 adequate
2026-10-01 borehole 0.7.9 6 adequate

Where this scan ran

This scan ran on ordinary cloud infrastructure (cloud-run), not in a hardware-isolated confidential VM. Nothing about it is attested by Google.

What an attested survey proves, and what it does not.

What this scan did with the repository — 3 steps

Written by the steps themselves as they ran, not described afterwards. A hand-written account of a data flow drifts the first time somebody changes the flow and not the account.

AtStepDetail
0.0s re-read from the facts kept at the last survey; nothing was cloned facts version: 1d7c04ef8dca7905
2.4s ran the deterministic checks blame pass: Trueread working tree: False
2.4s recorded where this scan ran attested: Falseenvironment: cloud-run

Total 2.4s ·source content sent off this machine: none · calls to a language model: 0 · the clone was deleted when the survey ended

An automated reading of a repository's code and its history up to one commit, with public advisory records. It may be wrong, it is not legal, financial, investment or security advice, and it does not replace diligence by a qualified person. It is provided for information: nobody may rely on it (Borehole's terms, section 3).

BOREHOLE 0.7.13 DETERMINISTIC LAYER · NO MODEL CALLSREAD ON BOREHOLE'S SERVER · CLONE DELETED TAKEDOWNCONTRIBUTED TO THIS REPOSITORY? YOUR RIGHTS