openapi-drift SKILL.md skillA
openapi-drift from sigistry/marketplace is an agent skill: a SKILL.md folder an AI agent loads when a task calls for it.
mdr add sigistry/marketplace/openapi-drift@git:20260826.571bc2fPins git:20260826.571bc2f in mdr.lock. Pin the fingerprint instead.
- Audit grade
- A, 17 of 17 checks passed
- Kind
- SKILL.md skill
- Repository
- sigistry/marketplace
- Path
plugins/api-contract-keeper/skills/openapi-drift/SKILL.md- Versions recorded
- 2
- Latest version
- git:20260826.571bc2f, committed Aug 26, 2026
- First version recorded
- Jul 15, 2026
- Size
- 4,024 bytes
- Repository stars
- 3
- License
- MIT
This skill should be used when the user mentions "openapi", "swagger", "spec drift", "api contract", "breaking change", "oasdiff", "graphql schema", "api versioning", "the docs don't match the code", "requestBody", "response schema", or reconciling an API specification with its handler code. It provides a static methodology for detecting spec-vs-code drift across web frameworks and for classifying changes as breaking or non-breaking with oasdiff-style semantics.
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
# OpenAPI Drift
## Purpose
Provide a standardized, static methodology for keeping an API specification and its implementation in sync, without starting the server. Two problems live here: **drift** (the spec and the code disagree about what the API does) and **breaking-change classification** (does a change to the surface break existing clients?). Both are read off the source: OpenAPI/Swagger YAML/JSON or GraphQL SDL on one side, and framework route/validation/serializer code on the other. This is the gap left when Optic (the popular OSS drift tool) was archived in January 2026.
## The two-model method
1. **Build the spec model**: endpoints (path + method), parameters, request/response schemas per status, required/nullable, security. From OpenAPI `paths`/`components`, or GraphQL `type`/`input`/`enum`/field args.
2. **Build the code model**: the same facts, read from the framework (routes, validators, DTOs, serializers, status calls). See `references/drift-signals.md`.
3. **Align** by path template + method (normalize `/x/{id}` ≡ `/x/:id`) or GraphQL type + field.
4. **Diff each axis** and record which side each fact came from, that provenance is what lets you assign authority.
…Read the whole file at its exact version.
How to install
mdr add sigistry/marketplace/openapi-drift@sha256:9552dada62f5b3a4The line at the top of this page pins the label git:20260826.571bc2f, 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_b64uhfjpyohfxfja)
3 badge image fetches in 30 days. What the badge shows.
Versions
The registry has recorded 2 versions of this file, between Jul 15, 2026 and Aug 26, 2026, about one every 42 days.
| version | committed | commit | size | audit | |
|---|---|---|---|---|---|
| git:20260826.571bc2f latest | 2026-08-26 | 571bc2f | 4,024 B | A | view · diff |
| git:20260715.6169119 | 2026-07-15 | 6169119 | 4,024 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 (4024 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
sigistry/marketplace · 3 stars · license MIT · pushed 2026-10-30 · branch main
API
GET https://markdownregistry.com/api/v1/artifacts/art_b64uhfjpyohfxfja GET https://markdownregistry.com/api/v1/resolve?ref=sigistry/marketplace/openapi-drift GET https://markdownregistry.com/api/v1/blob/9552dada62f5b3a4a91c797af79e035b407c1761c4c94d3062d93b37b549dbb4
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.