openapi-schema SKILL.md skillA
openapi-schema from valtterimelkko/agent-workflow-skills is an agent skill: a SKILL.md folder an AI agent loads when a task calls for it.
mdr add valtterimelkko/agent-workflow-skills/openapi-schema@git:20260611.b2584e4Pins git:20260611.b2584e4 in mdr.lock. Pin the fingerprint instead.
- Audit grade
- A, 17 of 17 checks passed
- Kind
- SKILL.md skill
- Repository
- valtterimelkko/agent-workflow-skills
- Path
skills/openapi-schema/SKILL.md- Versions recorded
- 1
- Latest version
- git:20260611.b2584e4, committed Jun 11, 2026
- Size
- 8,169 bytes
- Repository stars
- 2
- License
- MIT
Create OpenAPI 3.1.0 schema files for OpenAI Custom GPTs Actions. Use when the user needs to (1) Generate OpenAPI schemas for GPT actions/API integrations, (2) Convert API documentation to OpenAPI format, (3) Validate or fix existing OpenAPI schemas for GPT compatibility, (4) Add authentication configurations (API Key, OAuth 2.0), (5) Create schemas for specific HTTP methods (GET, POST, PUT, DELETE), (6) Structure request/response models for GPT consumption.
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 Schema Creator for OpenAI Actions
Create OpenAPI 3.1.0 schemas that enable Custom GPTs to call external REST APIs via the Actions protocol.
## Quick Start
To create a schema, you need:
1. **API endpoint(s)** - URL, method, parameters
2. **Authentication type** - None, API Key, or OAuth 2.0
3. **Request/response structure** - JSON models
## Core Requirements
- **OpenAPI Version**: Must use `3.1.0` (not 3.0.x or 2.0)
- **File Formats**: YAML (preferred) or JSON - both fully supported
- **Max File Size**: 1 MB
- **Max Endpoints**: 30 per action slot, 10 slots per GPT
## Schema Structure
### Minimal Valid Schema
```yaml
openapi: 3.1.0
info:
title: My API
description: What this API does
version: 1.0.0
servers:
- url: https://api.example.com
paths:
/endpoint:
get:
operationId: uniqueOperationName
summary: Brief description
description: Detailed description for GPT
responses:
'200':
description: Success
content:
application/json:
schema:
type: object
```
### Critical Elements for GPT Actions
| Element | Purpose | Tips |
|---------|---------|------|
…Read the whole file at its exact version.
How to install
mdr add valtterimelkko/agent-workflow-skills/openapi-schema@sha256:5ed0955f31b8005fThe line at the top of this page pins the label git:20260611.b2584e4, 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_hgd2pg7mhwersrp7)
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Versions
The registry has recorded 1 version of this file, committed on Jun 11, 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 (8169 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
valtterimelkko/agent-workflow-skills · 2 stars · license MIT · pushed 2026-10-28 · branch main
API
GET https://markdownregistry.com/api/v1/artifacts/art_hgd2pg7mhwersrp7 GET https://markdownregistry.com/api/v1/resolve?ref=valtterimelkko/agent-workflow-skills/openapi-schema GET https://markdownregistry.com/api/v1/blob/5ed0955f31b8005fd8f3d10b7e4ff9b43ee95f4a973706b51a1aeaf02e14c3df
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.