security-development-lifecycle SKILL.md skillA
security-development-lifecycle from amey-thakur/ai-skills is an agent skill: a SKILL.md folder an AI agent loads when a task calls for it.
mdr add amey-thakur/ai-skills/security-development-lifecycle@git:20260728.fac4544Pins git:20260728.fac4544 in mdr.lock. Pin the fingerprint instead.
- Audit grade
- A, 17 of 17 checks passed
- Kind
- SKILL.md skill
- Repository
- amey-thakur/ai-skills
- Path
skills/big-tech-processes/security-development-lifecycle/SKILL.md- Versions recorded
- 2
- Latest version
- git:20260728.fac4544, committed Jul 28, 2026
- First version recorded
- Jul 18, 2026
- Size
- 3,621 bytes
- Repository stars
- 14
- License
- MIT
Apply Microsoft's Security Development Lifecycle so threat modeling, tooling, and sign-off are built into each phase instead of bolted on before ship. Use when building or shipping software that takes untrusted input or handles sensitive data and you need a repeatable security process, not a one-time audit.
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
# Security development lifecycle Microsoft's SDL exists because security defects found at release are the ones that were never designed against. The framework spreads specific obligations across the phases, from requirements to response, so each gate catches a class of flaw at the point where fixing it is cheap. Run it as a checklist at the end and it becomes paperwork; run it as gates and it changes what ships. ## Method 1. **Set the bug bar and security requirements up front.** Before design, define the SDL bug bar: the severity thresholds that block release, and which vulnerability classes are never acceptable. Add security and privacy requirements to the backlog as tracked, owned work, not aspirations. 2. **Threat model every design.** Draw the data flow diagram, mark trust boundaries, and walk STRIDE (spoofing, tampering, repudiation, information disclosure, denial of service, elevation of privilege) against each element. Use the Microsoft Threat Modeling Tool or equivalent, record a mitigation per threat, and make the threat model a gate no design review passes without. 3. **Constrain the toolchain in implementation.** Pin approved compiler and …
Read the whole file at its exact version.
How to install
mdr add amey-thakur/ai-skills/security-development-lifecycle@sha256:2d8ebfcecaf78a08The line at the top of this page pins the label git:20260728.fac4544, 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_oa634ywtfwpp5acd)
4 badge image fetches in 30 days. What the badge shows.
Versions
The registry has recorded 2 versions of this file, between Jul 18, 2026 and Jul 28, 2026, about one every 10 days.
| version | committed | commit | size | audit | |
|---|---|---|---|---|---|
| git:20260728.fac4544 latest | 2026-07-28 | fac4544 | 3,621 B | A | view · diff |
| git:20260718.7c1285c | 2026-07-18 | 7c1285c | 3,618 B | A | view |
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 (3621 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
amey-thakur/ai-skills · 14 stars · license MIT · pushed 2026-09-06 · branch main
API
GET https://markdownregistry.com/api/v1/artifacts/art_oa634ywtfwpp5acd GET https://markdownregistry.com/api/v1/resolve?ref=amey-thakur/ai-skills/security-development-lifecycle GET https://markdownregistry.com/api/v1/blob/2d8ebfcecaf78a08f0992f19b449ad02b410353d0d6ff0e5afb106ddb88a8cd9
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.