Getting it into your agent
One page per mod, every tool's command on it. A separate URL per tool would split the same page into five that compete with each other.
npx skills add valtterimelkko/agent-workflow-skills --skill openapi-schemagit clone --depth 1 https://github.com/valtterimelkko/agent-workflow-skillsWrote this? Show the measurements
A badge with what this costs and how it scanned, read live from this page, so it follows the numbers instead of freezing them. Markdown for a README, HTML for a documentation site or a project page.
[](https://agentmods.dev/skills/valtterimelkko/agent-workflow-skills/openapi-schema)<a href="https://agentmods.dev/skills/valtterimelkko/agent-workflow-skills/openapi-schema"><img src="https://agentmods.dev/badge/skills/valtterimelkko/agent-workflow-skills/openapi-schema/github.svg" alt="Measured on agentmods" height="20"></a>Or the 80×15 button, for a site that already has a row of RSS and ATOM ones. Only the verdict fits; the numbers stay here.
<a href="https://agentmods.dev/skills/valtterimelkko/agent-workflow-skills/openapi-schema"><img src="https://agentmods.dev/badge/skills/valtterimelkko/agent-workflow-skills/openapi-schema.svg" alt="Reviewed on agentmods" width="80" height="20"></a>What it costs to keep this loaded
Counted locally with the o200k_base tokenizer, which is exact for GPT models; Claude uses its own tokenizer and its counts differ. Treat this as one consistent yardstick across the catalogue rather than a bill. Prices are per million input tokens.
| Model | Per session | Once invoked |
|---|---|---|
| Fable 5.1 | $0.00113 | $0.01924 |
| Opus 5 | $0.00056 | $0.00962 |
| Sonnet 5 | $0.00023 | $0.00385 |
| Haiku 4.5 | $0.00011 | $0.00192 |
Grade A, and why
openapi-schema scanned grade A with 0 findings against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured 8d ago.
A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.
Nothing flagged
None of the 26 patterns this scan looks for appear in this file: no shell pipes, no recursive deletes, no credential paths, no hidden text, no instruction-override or anti-refusal phrasing, no agent-config snooping. That is not a guarantee, it is the absence of the things that are checkable.
How it starts
The opening of the file, as written. The whole thing — 346 lines — stays where its author put it; the contents beside it link to each section on GitHub.
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:
- API endpoint(s) - URL, method, parameters
- Authentication type - None, API Key, or OAuth 2.0
- 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
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 |
|---|---|---|
operationId |
Unique identifier | Use camelCase, no spaces |
description |
GPT decision guidance | Be specific about when to use |
summary |
Brief context | Max 300 characters |
parameters |
Input collection | Use enums for fixed values |
Authentication Patterns
No Authentication
# Simply omit security sections
paths:
/public/data:
get:
operationId: getPublicData
security: [] # Explicitly no auth
API Key
components:
securitySchemes:
ApiKeyAuth:
type: apiKey
in: header # or query
name: X-API-Key
security:
- ApiKeyAuth: []
paths:
/private/data:
get:
operationId: getPrivateData
security:
- ApiKeyAuth: []
OAuth 2.0
components:
securitySchemes:
OAuth2:
type: oauth2
flows:
authorizationCode:
authorizationUrl: https://auth.example.com/authorize
tokenUrl: https://auth.example.com/token
scopes:
read: Read access
write: Write access
What ships with it
2 files beside SKILL.md in the same directory: the scripts, references and assets a skill reads on demand. Not counted in the per-session cost; read them before you install if any of them is executable.
What this file has done since we first saw it
Hashed on every crawl. A supply-chain change to an agent config is a question of when, not whether, so the history is kept rather than the latest state alone.
- 8d ago First seen · 346 lines · 113 tokens per session scan A 5ed0955f31b8
openapi-schema is a skill published in the GitHub repository valtterimelkko/agent-workflow-skills (2 stars, last pushed 2mo ago), licensed MIT. It adds 113 tokens to every session and 1,924 once invoked, about $0.0006 per session on Opus 5. A static security scan graded it A with 0 findings. No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-31.
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