Agent skill

Openapi Validator

by majiayu000 in majiayu000/claude-skill-registry

Validate OpenAPI specifications for correctness, security, and best practices

Install Openapi Validator

skills CLI

$ npx skills add majiayu000/claude-skill-registry --skill openapi-validator -a claude-code

Project install by default; add -g for ~/.claude/skills/.

GitHub CLI

$ gh skill install majiayu000/claude-skill-registry openapi-validator --agent claude-code

Project scope by default; add --scope user for a personal install. Needs GitHub CLI 2.90.0 or later (public preview).

Manual copy

$ git clone --depth 1 https://github.com/majiayu000/claude-skill-registry.git skills-src && mkdir -p .claude/skills && cp -r skills-src/skills/api/openapi-validator .claude/skills/openapi-validator && rm -rf skills-src

Use ~/.claude/skills/ instead of .claude/skills for a personal install. The folder must contain SKILL.md.

Claude Code skills documentation · loads skills from .claude/skills/

Paste into Claude Code

Install the "openapi-validator" agent skill from https://github.com/majiayu000/claude-skill-registry/tree/main/skills/api/openapi-validator into .claude/skills/openapi-validator/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "openapi-validator", then confirm the skill loads.

Claude Code copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.

$skill-installer

$skill-installer install https://github.com/majiayu000/claude-skill-registry/tree/main/skills/api/openapi-validator

Type this inside Codex. $skill-installer <name> installs a curated skill from openai/skills. The installer writes to $CODEX_HOME/skills (default ~/.codex/skills). Restart Codex if the skill does not show up.

skills CLI

$ npx skills add majiayu000/claude-skill-registry --skill openapi-validator -a codex

Project install goes to .agents/skills/; add -g for ~/.codex/skills/.

GitHub CLI

$ gh skill install majiayu000/claude-skill-registry openapi-validator --agent codex

Project scope by default (.agents/skills/); add --scope user for a personal install.

Manual copy

$ git clone --depth 1 https://github.com/majiayu000/claude-skill-registry.git skills-src && mkdir -p .agents/skills && cp -r skills-src/skills/api/openapi-validator .agents/skills/openapi-validator && rm -rf skills-src

Use ~/.agents/skills/ instead of .agents/skills for a personal install.

Codex skills documentation · loads skills from .agents/skills/

Paste into Codex

Install the "openapi-validator" agent skill from https://github.com/majiayu000/claude-skill-registry/tree/main/skills/api/openapi-validator into .agents/skills/openapi-validator/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "openapi-validator", then confirm the skill loads.

Codex copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.

skills CLI

$ npx skills add majiayu000/claude-skill-registry --skill openapi-validator -a cursor

Project install goes to .agents/skills/; add -g for ~/.cursor/skills/.

GitHub CLI

$ gh skill install majiayu000/claude-skill-registry openapi-validator --agent cursor

Project scope by default (.agents/skills/); add --scope user for a personal install.

Manual copy

$ git clone --depth 1 https://github.com/majiayu000/claude-skill-registry.git skills-src && mkdir -p .cursor/skills && cp -r skills-src/skills/api/openapi-validator .cursor/skills/openapi-validator && rm -rf skills-src

Use ~/.cursor/skills/ instead of .cursor/skills for a personal install.

Cursor skills documentation · loads skills from .cursor/skills/, .agents/skills/, .claude/skills/, .codex/skills/

Paste into Cursor

Install the "openapi-validator" agent skill from https://github.com/majiayu000/claude-skill-registry/tree/main/skills/api/openapi-validator into .cursor/skills/openapi-validator/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "openapi-validator", then confirm the skill loads.

Cursor copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.

gemini skills install

$ gemini skills install https://github.com/majiayu000/claude-skill-registry.git --path skills/api/openapi-validator

--scope user (default) or --scope workspace; --path is the subfolder of the repo that holds the skill; --consent skips the security confirmation prompt.

skills CLI

$ npx skills add majiayu000/claude-skill-registry --skill openapi-validator -a gemini-cli

Project install goes to .agents/skills/; add -g for ~/.gemini/skills/.

GitHub CLI

$ gh skill install majiayu000/claude-skill-registry openapi-validator --agent gemini-cli

Project scope by default (.agents/skills/); add --scope user for a personal install.

Manual copy

$ git clone --depth 1 https://github.com/majiayu000/claude-skill-registry.git skills-src && mkdir -p .gemini/skills && cp -r skills-src/skills/api/openapi-validator .gemini/skills/openapi-validator && rm -rf skills-src

Use ~/.gemini/skills/ instead of .gemini/skills for a personal install, then run /skills reload.

Gemini CLI skills documentation · loads skills from .gemini/skills/, .agents/skills/

Paste into Gemini CLI

Install the "openapi-validator" agent skill from https://github.com/majiayu000/claude-skill-registry/tree/main/skills/api/openapi-validator into .gemini/skills/openapi-validator/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "openapi-validator", then confirm the skill loads.

Gemini CLI copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.

GitHub CLI

$ gh skill install majiayu000/claude-skill-registry openapi-validator

Installs for Copilot at project scope by default; add --scope user for a personal install. Preview a skill first with gh skill preview. Needs GitHub CLI 2.90.0 or later (public preview).

skills CLI

$ npx skills add majiayu000/claude-skill-registry --skill openapi-validator -a github-copilot

Project install goes to .agents/skills/; add -g for ~/.copilot/skills/.

Manual copy

$ git clone --depth 1 https://github.com/majiayu000/claude-skill-registry.git skills-src && mkdir -p .github/skills && cp -r skills-src/skills/api/openapi-validator .github/skills/openapi-validator && rm -rf skills-src

Use ~/.copilot/skills/ instead of .github/skills for a personal install. Commit .github/skills so cloud agent and code review can use it.

GitHub Copilot skills documentation · loads skills from .github/skills/, .claude/skills/, .agents/skills/

Paste into GitHub Copilot

Install the "openapi-validator" agent skill from https://github.com/majiayu000/claude-skill-registry/tree/main/skills/api/openapi-validator into .github/skills/openapi-validator/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "openapi-validator", then confirm the skill loads.

GitHub Copilot copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.

skills CLI

$ npx skills add majiayu000/claude-skill-registry --skill openapi-validator -a opencode

OpenCode documents no install command of its own. Project install goes to .agents/skills/; add -g for ~/.config/opencode/skills/.

GitHub CLI

$ gh skill install majiayu000/claude-skill-registry openapi-validator --agent opencode

Project scope by default (.agents/skills/); add --scope user for a personal install.

Manual copy

$ git clone --depth 1 https://github.com/majiayu000/claude-skill-registry.git skills-src && mkdir -p .opencode/skills && cp -r skills-src/skills/api/openapi-validator .opencode/skills/openapi-validator && rm -rf skills-src

Use ~/.config/opencode/skills/ instead of .opencode/skills for a personal install.

OpenCode skills documentation · loads skills from .opencode/skills/, .claude/skills/, .agents/skills/

Paste into OpenCode

Install the "openapi-validator" agent skill from https://github.com/majiayu000/claude-skill-registry/tree/main/skills/api/openapi-validator into .opencode/skills/openapi-validator/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "openapi-validator", then confirm the skill loads.

OpenCode copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.

Facts

Skill name: openapi-validator
GitHub stars: 666
Used in: 1 other repo
Token cost: ~599 tokens
SKILL.md length: 62 words
Files: 2
Skills in repo: 971
Repo updated: Oct 7, 2026
First seen: Oct 7, 2026
Licence: MIT

At a glance

Validate OpenAPI specifications for correctness, security, and best practices

Tasks that involve OpenAPI specifications
SKILL.md covers Overview, Capabilities, Target Processes and Input Schema, plus 2 more sections
Instructions only: no scripts, shell commands, URLs or credentials in SKILL.md

What it does

Openapi Validator is an agent skill from majiayu000/claude-skill-registry. Validate OpenAPI specifications for correctness, security, and best practices

Its SKILL.md is about 600 tokens, which your agent loads only when the skill is triggered. The skill folder holds 1 other file (for example `metadata.json`).

It sits in Backend & APIs, covering OpenAPI specifications. It works with OpenAPI. The repository describes itself as: Searchable Claude Code skills catalog with source-linked guides and generated registry artifacts. The licence is MIT.

When your agent uses it

Tasks that involve OpenAPI specifications

Example prompts

“/openapi-validator”

Requirements

Pre-approved tools (allowed-tools): Bash, Read, Write, Glob

What it can do on your machine

Read from SKILL.md and the folder at commit 000116a. It shows what the files ask for, not the result of running them.

Tool permissions
Pre-approves these tools, so the agent can use them without asking each time:
- Bash
- Read
- Write
- Glob
From allowed-tools in the SKILL.md frontmatter.
Runs code
No scripts in the folder and no shell commands in SKILL.md (its code samples are json and javascript).
From the folder's file list and the shell code blocks in SKILL.md.
Network
No URLs in SKILL.md.
From URLs in SKILL.md, links to its own repository left out.
Credentials
Names no API keys, tokens, secrets or passwords.
From names ending in _API_KEY, _TOKEN, _SECRET, _KEY or _PASSWORD in SKILL.md.

Context cost

Openapi Validator loads about 599 tokens when it runs. Until then it costs about 24 tokens; SKILL.md has 62 words of instructions outside code blocks.

Always · name and description, kept in context so the agent knows when to use it: ~24
When it runs · the whole SKILL.md, loaded when a task matches: ~599

Estimates: characters ÷ 4, the usual rule of thumb; real counts depend on the model's tokenizer. Scripts and assets cost tokens only if the agent reads them.

Safety

Auto-check: notes

The automated check noted patterns worth knowing about, such as sudo or a known installer.

NotePre-approves every shell command (allowed-tools: Bash)SKILL.md
```
allowed-tools: Bash, Read, Write, Glob
```

Automated static check — not a guarantee. Review scripts before installing. It scans the text of SKILL.md for risky patterns (piping downloads into a shell, reading credential files, hidden Unicode, destructive commands); files beside SKILL.md are not scanned.

SKILL.md

The full file from majiayu000/claude-skill-registry at commit 000116a, republished under its MIT licence (© majiayu000). 62 words, ~599 tokens.

Download SKILL.mdSave it as .claude/skills/openapi-validator/SKILL.md (or your agent's skills folder). This skill also uses 1 other file; get the full folder from GitHub.

name: openapi-validator
description: Validate OpenAPI specifications for correctness, security, and best practices
allowed-tools: Bash, Read, Write, Glob

OpenAPI Validator Skill

Overview

Validates OpenAPI specifications for correctness, security definitions, best practices compliance, and breaking change detection between versions.

Capabilities

Validate OpenAPI 3.0/3.1 specifications
Check security definitions completeness
Lint for API design best practices
Compare specification versions
Detect breaking changes between versions
Custom rule configuration
Integration with Spectral and other linters

Target Processes

api-design-specification
system-design-review

Input Schema

json

{
  "type": "object",
  "required": ["specPath"],
  "properties": {
    "specPath": {
      "type": "string",
      "description": "Path to OpenAPI specification file"
    },
    "mode": {
      "type": "string",
      "enum": ["validate", "lint", "compare", "security"],
      "default": "validate"
    },
    "compareWith": {
      "type": "string",
      "description": "Path to previous spec version for comparison"
    },
    "rules": {
      "type": "object",
      "properties": {
        "ruleset": {
          "type": "string",
          "enum": ["spectral:oas", "custom"],
          "default": "spectral:oas"
        },
        "severity": {
          "type": "string",
          "enum": ["error", "warn", "info"],
          "default": "warn"
        }
      }
    }
  }
}

Output Schema

json

{
  "type": "object",
  "properties": {
    "valid": {
      "type": "boolean"
    },
    "errors": {
      "type": "array",
      "items": {
        "type": "object",
        "properties": {
          "path": { "type": "string" },
          "message": { "type": "string" },
          "severity": { "type": "string" }
        }
      }
    },
    "warnings": {
      "type": "array"
    },
    "breakingChanges": {
      "type": "array",
      "description": "List of breaking changes when comparing"
    },
    "securityIssues": {
      "type": "array"
    }
  }
}

Usage Example

javascript

{
  kind: 'skill',
  skill: {
    name: 'openapi-validator',
    context: {
      specPath: 'api/openapi.yaml',
      mode: 'lint',
      rules: {
        ruleset: 'spectral:oas',
        severity: 'warn'
      }
    }
  }
}

Files

SKILL.md and 1 other file in skills/api/openapi-validator of majiayu000/claude-skill-registry.

SKILL.md
metadata.json

Open the folder on GitHubat commit 000116a

Used in 1 other repository

We found 1 copy of this SKILL.md (exact, near-identical or edited) in other folders, from 1 other GitHub owner. This page covers the copy in majiayu000/claude-skill-registry, which our catalogue first saw on October 7, 2026.

a5c-ai/babysitterlibrary/specializations/software-architecture/skills/openapi-validator

Compare with similar skills

Openapi Validator next to the 5 skills that share the most tags, products or categories with it. Stars are the repository's; “used in” counts other GitHub owners with a copy.

Openapi Validator compared with similar skills
Skill	Stars	Used in	Tokens	Auto-check	Licence	Repo updated
Openapi Validator this skillmajiayu000/claude-skill-registry	666	1 repos	~599	Automated safety check: Notes	MIT	today
ToolJet Marketplace Plugin BuilderToolJet/ToolJet	41k	—	~2.1k	Automated safety check: Pass	AGPL-3.0	yesterday
Step Partsearthtojake/text-to-cad	18k	1 repos	~1.5k	Automated safety check: Pass	MIT	yesterday
API DesignerJeffallan/claude-skills	12k	2 repos	~2k	Automated safety check: Pass	MIT	4 days ago
OpenAPI to MCP Servermcp-use/mcp-use	11k	—	~5.2k	Automated safety check: Pass	Apache-2.0	yesterday
Use Yaakmountain-loop/yaak	19k	—	~1.9k	Automated safety check: Pass	MIT	today

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Questions about Openapi Validator

What does Openapi Validator do?

Validate OpenAPI specifications for correctness, security, and best practices. Openapi Validator is an agent skill from majiayu000/claude-skill-registry.

When should I use Openapi Validator?

Openapi Validator fits situations like: tasks that involve OpenAPI specifications.

How do I install Openapi Validator in Claude Code?

Run `npx skills add majiayu000/claude-skill-registry --skill openapi-validator -a claude-code`. Or copy the skill folder (skills/api/openapi-validator in majiayu000/claude-skill-registry) into .claude/skills/openapi-validator in your project. Claude Code loads it when a task matches its description.

How do I install Openapi Validator in Codex?

Run `npx skills add majiayu000/claude-skill-registry --skill openapi-validator -a codex`. Or copy the skill folder (skills/api/openapi-validator in majiayu000/claude-skill-registry) into .agents/skills/openapi-validator in your project. Codex loads it when a task matches its description.

Can I use Openapi Validator in Cursor, Gemini CLI or GitHub Copilot?

Cursor, Gemini CLI, GitHub Copilot and OpenCode also load SKILL.md folders. With the skills CLI, run `npx skills add majiayu000/claude-skill-registry --skill openapi-validator -a cursor` (or -a gemini-cli, github-copilot or opencode for the others). To copy it by hand, put the folder in .cursor/skills/openapi-validator, .gemini/skills/openapi-validator, .github/skills/openapi-validator and .opencode/skills/openapi-validator in your project.

What does Openapi Validator need to run?

SKILL.md names no scripts, command-line tools or credentials: Openapi Validator is instructions for the agent only. Its frontmatter pre-approves these tools: Bash, Read, Write, Glob.

Does Openapi Validator access the network?

SKILL.md contains no URLs. Any network use would come from the scripts or tools the agent runs. This is read from the text; nothing was executed.

Is Openapi Validator safe to install?

Our automated static check of SKILL.md found notes only (pre-approves every shell command (allowed-tools: bash)), nothing it rates as a warning. It is not a guarantee. Review the folder before installing.

What licence does Openapi Validator use?

Openapi Validator is published under the MIT licence (the repository's licence). It allows redistribution, so the full SKILL.md is shown on this page.

How many tokens does Openapi Validator use?

About 599 tokens (SKILL.md is roughly 2.4k characters). Agents keep only the skill's name and description in context until a task matches; then they load SKILL.md in full.

What are the alternatives to Openapi Validator?

Skills that share tags, products or a category with Openapi Validator: ToolJet Marketplace Plugin Builder (ToolJet/ToolJet, 41k stars), Step Parts (earthtojake/text-to-cad, 18k stars), API Designer (Jeffallan/claude-skills, 12k stars) and OpenAPI to MCP Server (mcp-use/mcp-use, 11k stars). The comparison table on this page puts their stars, adoption, token cost, safety result and licence side by side.

Who maintains Openapi Validator?

majiayu000 (a GitHub user) maintains it in majiayu000/claude-skill-registry, which has 666 GitHub stars. The repository holds 971 skills in this directory. The repository was last updated on October 7, 2026.

Source: majiayu000/claude-skill-registry on GitHub. Facts on this page come from the repository at the commit we read; the author's words are quoted as theirs.

Install Openapi Validator

Facts

At a glance

What it does

When your agent uses it

Example prompts

Requirements

What it can do on your machine

Tool permissions

Runs code

Network

Credentials

Context cost

Safety

SKILL.md

OpenAPI Validator Skill

Overview

Capabilities

Target Processes

Input Schema

Output Schema

Usage Example

Files

Used in 1 other repository

Compare with similar skills

Similar skills

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Related

Questions about Openapi Validator