openapi-spec-generation

openapi-spec-generation is a skill for Claude Code, Codex from beel-collab/presets.dev. It costs 37 tokens per session (322 once invoked), scanned A, a copy of openapi-spec-generation, MIT.

A set of practices for creating and maintaining OpenAPI 3.1 specifications. OpenAPI is a standard document that describes how a web API works so people and software can use it consistently.

In plain words
What is it for?
Use it to document an API, create a specification from existing code, design an API before coding, validate an implementation, or generate client SDKs.
Why use it?
It helps keep API documentation and the actual implementation aligned. A clear specification can also serve as the shared contract for API design and client generation.

Skill for Claude CodeCodex

Written for no agent in particular: nothing here depends on one.

Good fit Use it to document an API, create a specification from existing code, design an API before coding, validate an implementation, or generate client SDKs.

Compare 6 skills from other repositories ↓
Install with agentmods
npx agentmods add skills/beel-collab/presets.dev/openapi-spec-generation
Install

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.

Any agent
npx skills add beel-collab/presets.dev --skill openapi-spec-generation
Clone the repo
git clone --depth 1 https://github.com/beel-collab/presets.dev

Made for: Claude Code, Codex.

Wrote 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.

agentmods badge for openapi-spec-generation

README.md
[![agentmods](https://agentmods.dev/badge/skills/beel-collab/presets.dev/openapi-spec-generation/github.svg)](https://agentmods.dev/skills/beel-collab/presets.dev/openapi-spec-generation)
Your own site
<a href="https://agentmods.dev/skills/beel-collab/presets.dev/openapi-spec-generation"><img src="https://agentmods.dev/badge/skills/beel-collab/presets.dev/openapi-spec-generation/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.

agentmods 80×15 button for openapi-spec-generation

Your own site · 80×15
<a href="https://agentmods.dev/skills/beel-collab/presets.dev/openapi-spec-generation"><img src="https://agentmods.dev/badge/skills/beel-collab/presets.dev/openapi-spec-generation.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 37 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 322 The whole file, excluding the scripts and references it only reads on demand.
Security scan A 0 findings. A grade says what 26 rules found in the file — not that it is safe.
Origin 88% copy Near-identical to another mod in the catalogue.
Token cost

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.

ModelPer sessionOnce invoked
Fable 5.1 $0.00037 $0.00322
Opus 5.5 $0.00015 $0.00129
Sonnet 5.5 $0.00007 $0.00064
Haiku 4.5 $0.00004 $0.00032

Measured 1mo ago against content hash b2f411c15d17, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

openapi-spec-generation 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 1mo 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.

Origin

This is a copy

88% identical to openapi-spec-generation — 15 lines differ, which has more behind it and is treated as the original. This page carries a canonical link to it rather than competing with it.

claude/skills/api-integration/openapi-spec-generation/SKILL.md · 43 lines

What it actually says

OpenAPI Spec Generation

Comprehensive patterns for creating, maintaining, and validating OpenAPI 3.1 specifications for RESTful APIs.

Use this skill when

  • Creating API documentation from scratch
  • Generating OpenAPI specs from existing code
  • Designing API contracts (design-first approach)
  • Validating API implementations against specs
  • Generating client SDKs from specs
  • Setting up API documentation portals

Do not use this skill when

  • The task is unrelated to openapi spec generation
  • You need a different domain or tool outside this scope

Instructions

  • Clarify goals, constraints, and required inputs.
  • Apply relevant best practices and validate outcomes.
  • Provide actionable steps and verification.
  • If detailed examples are required, open resources/implementation-playbook.md.

Resources

  • resources/implementation-playbook.md for detailed patterns and examples.

Limitations

  • Use this skill only when the task clearly matches the scope described above.
  • Do not treat the output as a substitute for environment-specific validation, testing, or expert review.
  • Stop and ask for clarification if required inputs, permissions, safety boundaries, or success criteria are missing.
Changes

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.

  1. 1mo ago First seen · 43 lines · 37 tokens per session scan A b2f411c15d17

Subscribe to this mod's changes

openapi-spec-generation is a skill published in the GitHub repository beel-collab/presets.dev (3 stars, last pushed 5mo ago), licensed MIT. It adds 37 tokens to every session and 322 once invoked, about $0.0001 per session on Opus 5.5. A static security scan graded it A with 0 findings. It is 88% identical to openapi-spec-generation, differing in 15 lines, and is treated as a copy.

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