factory-security SKILL.md skillA
factory-security from nonlinear-xyz/factory-kit is an agent skill: a SKILL.md folder an AI agent loads when a task calls for it.
mdr add nonlinear-xyz/factory-kit/factory-security@git:20260716.517fb94Pins git:20260716.517fb94 in mdr.lock. Pin the fingerprint instead.
- Audit grade
- A, 17 of 17 checks passed
- Kind
- SKILL.md skill
- Repository
- nonlinear-xyz/factory-kit
- Path
skills/factory-security/SKILL.md- Versions recorded
- 1
- Latest version
- git:20260716.517fb94, committed Jul 16, 2026
- Size
- 10,917 bytes
- Repository stars
- 9
- License
- MIT
Security conventions for builds that touch sensitive data, regulated industries, or AI-generated code paths. Covers KMS encryption at rest, BAA verification for PHI in email/SMS, safe URL redirects, admin-client bypass guardrails, in-memory rate-limiter caveats, the "read-only by default" stance for AI-generated code, mandatory-review-queue pattern, and request tracing for support workflows.
Collected from public GitHub. Every version is saved exactly as it was and never changes. Install it at an exact version with the mdr tool, and every file is checked before it reaches your agent. The main file is checked against the SHA-256 fingerprint recorded here, and the others against the fingerprints GitHub keeps for its source commit. The automatic checks below grade the latest version, and the same checks always give the same file the same grade.
What the file says
# Factory security
Each section leads with **Principle** (one sentence, stack-agnostic), then **Why** (constraint → option → tradeoff), then **Recipe** (the KMS / Resend / Upstash shape we use), and **Failure mode** when there's one to name.
## Sensitive data at rest — encrypted with context binding
**Principle.** Sensitive data (SSN, government IDs, PHI fields, financial accounts) is KMS-encrypted at rest, with encryption context bound to the row's identity.
**Why.** Encryption alone protects against database exfiltration but not against row-shuffling — an attacker who can write to the database can swap encrypted blobs between rows, and the system decrypts each happily. Binding the encryption context to the user ID (or org ID) means KMS refuses to decrypt the blob when the context doesn't match — the row-shuffling failure mode becomes a decryption failure, which is loud.
**Recipe.**
```ts
// Encrypt on write
const encryptedSSN = await kms.encrypt(plaintext, {
keyId: KMS_KEY_ID,
context: { userId },
});
await db.update(users).set({ ssnEncrypted: encryptedSSN }).where(eq(users.id, userId));
// Decrypt on read — only in the handler that actually needs plaintext
…Read the whole file at its exact version.
How to install
mdr add nonlinear-xyz/factory-kit/factory-security@sha256:81a3fbf101d85d71The line at the top of this page pins the label git:20260716.517fb94, which is what most people want. This one pins the sha256 fingerprint of the contents instead, so it survives a label being moved. Either way the exact version is written to mdr.lock, and mdr install downloads and checks those contents again, so it installs them exactly or stops with an error.
[](https://markdownregistry.com/a/art_dajblcn63v5nflbm)
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Versions
The registry has recorded 1 version of this file, committed on Jul 16, 2026.
Audit of the latest version
- pass: Frontmatter block present
- pass: Frontmatter declares a name
- pass: Frontmatter declares a description
- pass: Size between 200 bytes and 200 KB (10917 bytes)
- pass: No zero-width or bidi control characters
- pass: No instruction hidden inside an HTML comment
- pass: No link to an exfiltration or paste host
- pass: No credential-shaped string
- pass: No instruction to send local credentials anywhere
- pass: No text hidden with inline styles
- pass: No prompt-injection phrasing
- pass: No curl or wget piped into a shell
- pass: No recursive delete of root, home or parent
- pass: No instruction to read or print local credentials
- pass: No base64 blob over 200 characters
- pass: No link to a raw IP address
- pass: No script tag
Source
nonlinear-xyz/factory-kit · 9 stars · license MIT · pushed 2026-10-29 · branch main
API
GET https://markdownregistry.com/api/v1/artifacts/art_dajblcn63v5nflbm GET https://markdownregistry.com/api/v1/resolve?ref=nonlinear-xyz/factory-kit/factory-security GET https://markdownregistry.com/api/v1/blob/81a3fbf101d85d71f9b71e3576040bf9f365775e3f82e33db6b3d49ade0c35d3
Your AI assistant does the legwork. You hear about the deals worth your word. Hand yours the standing instructions at modelranch.com and it joins the network that reads files like this one.
Guides: the SKILL.md format and its required fields · what to check before you install a skill · how to pin a skill to an exact version · where to find agent skills · keeping a team on the same skills · which agent file does what.