Agent skill

Schemas

YAML frontmatter schemas for Claude Code agents and commands.

MITAuto-check passed

Install Schemas

skills CLI

$ npx skills add MadAppGang/claude-code --skill schemas -a claude-code

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

GitHub CLI

$ gh skill install MadAppGang/claude-code schemas --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/MadAppGang/claude-code.git skills-src && mkdir -p .claude/skills && cp -r skills-src/plugins/agentdev/skills/schemas .claude/skills/schemas && 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 "schemas" agent skill from https://github.com/MadAppGang/claude-code/tree/main/plugins/agentdev/skills/schemas into .claude/skills/schemas/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "schemas", 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/MadAppGang/claude-code/tree/main/plugins/agentdev/skills/schemas

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 MadAppGang/claude-code --skill schemas -a codex

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

GitHub CLI

$ gh skill install MadAppGang/claude-code schemas --agent codex

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

Manual copy

$ git clone --depth 1 https://github.com/MadAppGang/claude-code.git skills-src && mkdir -p .agents/skills && cp -r skills-src/plugins/agentdev/skills/schemas .agents/skills/schemas && 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 "schemas" agent skill from https://github.com/MadAppGang/claude-code/tree/main/plugins/agentdev/skills/schemas into .agents/skills/schemas/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "schemas", 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 MadAppGang/claude-code --skill schemas -a cursor

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

GitHub CLI

$ gh skill install MadAppGang/claude-code schemas --agent cursor

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

Manual copy

$ git clone --depth 1 https://github.com/MadAppGang/claude-code.git skills-src && mkdir -p .cursor/skills && cp -r skills-src/plugins/agentdev/skills/schemas .cursor/skills/schemas && 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 "schemas" agent skill from https://github.com/MadAppGang/claude-code/tree/main/plugins/agentdev/skills/schemas into .cursor/skills/schemas/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "schemas", 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/MadAppGang/claude-code.git --path plugins/agentdev/skills/schemas

--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 MadAppGang/claude-code --skill schemas -a gemini-cli

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

GitHub CLI

$ gh skill install MadAppGang/claude-code schemas --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/MadAppGang/claude-code.git skills-src && mkdir -p .gemini/skills && cp -r skills-src/plugins/agentdev/skills/schemas .gemini/skills/schemas && 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 "schemas" agent skill from https://github.com/MadAppGang/claude-code/tree/main/plugins/agentdev/skills/schemas into .gemini/skills/schemas/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "schemas", 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 MadAppGang/claude-code schemas

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 MadAppGang/claude-code --skill schemas -a github-copilot

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

Manual copy

$ git clone --depth 1 https://github.com/MadAppGang/claude-code.git skills-src && mkdir -p .github/skills && cp -r skills-src/plugins/agentdev/skills/schemas .github/skills/schemas && 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 "schemas" agent skill from https://github.com/MadAppGang/claude-code/tree/main/plugins/agentdev/skills/schemas into .github/skills/schemas/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "schemas", 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 MadAppGang/claude-code --skill schemas -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 MadAppGang/claude-code schemas --agent opencode

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

Manual copy

$ git clone --depth 1 https://github.com/MadAppGang/claude-code.git skills-src && mkdir -p .opencode/skills && cp -r skills-src/plugins/agentdev/skills/schemas .opencode/skills/schemas && 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 "schemas" agent skill from https://github.com/MadAppGang/claude-code/tree/main/plugins/agentdev/skills/schemas into .opencode/skills/schemas/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "schemas", 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: schemas
GitHub stars: 285
Token cost: ~1.1k tokens
SKILL.md length: 240 words
Files: 1
Skills in repo: 69
Repo updated: Mar 15, 2026
First seen: Oct 7, 2026
Licence: MIT

At a glance

YAML frontmatter schemas for Claude Code agents and commands.

Validating agent/command files
SKILL.md covers Agent Frontmatter, Command Frontmatter, Validation Checklist and Common Errors
Instructions only: no scripts, shell commands, URLs or credentials in SKILL.md

What it does

Schemas is an agent skill from MadAppGang/claude-code. YAML frontmatter schemas for Claude Code agents and commands. Use when creating or validating agent/command files.

Its SKILL.md is about 1.1k tokens, which your agent loads only when the skill is triggered. It is a single SKILL.md file with no bundled scripts.

It works with Bash. The repository describes itself as: claude code plugins marketplace. The licence is MIT.

When your agent uses it

Validating agent/command files

Example prompts

“/schemas”

What it can do on your machine

Read from SKILL.md and the folder at commit 6097ad4. It shows what the files ask for, not the result of running them.

Tool permissions
Pre-approves nothing: there is no allowed-tools line, so your agent's usual permission prompts apply.
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 yaml).
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

Schemas loads about 1.1k tokens when it runs. Until then it costs about 31 tokens; SKILL.md has 240 words of instructions outside code blocks.

Always · name and description, kept in context so the agent knows when to use it: ~31
When it runs · the whole SKILL.md, loaded when a task matches: ~1.1k

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 passed

The automated check found no risky patterns in SKILL.md.

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 MadAppGang/claude-code at commit 6097ad4, republished under its MIT licence (© MadAppGang). 240 words, ~1,055 tokens.

Download SKILL.mdSave it as .claude/skills/schemas/SKILL.md (or your agent's skills folder).

name: schemas
description: YAML frontmatter schemas for Claude Code agents and commands. Use when creating or validating agent/command files.

plugin: agentdev updated: 2026-01-20

Frontmatter Schemas

Agent Frontmatter

yaml

---
name: agent-name               # Required: lowercase-with-hyphens
description: |                 # Required: detailed with examples
  Use this agent when [scenario]. Examples:
  (1) "Task description" - launches agent for X
  (2) "Task description" - launches agent for Y
  (3) "Task description" - launches agent for Z
model: sonnet                  # Required: sonnet | opus | haiku
color: purple                  # Optional: purple | cyan | green | orange | blue | red
tools: TaskCreate, TaskUpdate, TaskList, TaskGet, Read, Write  # Required: comma-separated, space after comma
skills: skill1, skill2         # Optional: referenced skills
---

Field Reference

Field	Required	Values	Description
`name`	Yes	`lowercase-with-hyphens`	Agent identifier
`description`	Yes	Multi-line string	3-5 usage examples
`model`	Yes	`sonnet`, `opus`, `haiku`	AI model to use
`color`	No	See colors below	Terminal color
`tools`	Yes	Tool list	Available tools
`skills`	No	Skill list	Referenced skills

Color Guidelines

Color	Agent Type	Examples
`purple`	Planning	architect, api-architect
`green`	Implementation	developer, ui-developer
`cyan`	Review	reviewer, designer
`orange`	Testing	test-architect, tester
`blue`	Utility	cleaner, api-analyst
`red`	Critical/Security	(rarely used)

Tool Patterns by Agent Type

Orchestrators (Commands):

Must have: Task, TaskCreate, TaskUpdate, TaskList, TaskGet, Read, Bash
Often: AskUserQuestion, Glob, Grep
Never: Write, Edit

Planners:

Must have: TaskCreate, TaskUpdate, TaskList, TaskGet, Read, Write (for docs)
Often: Glob, Grep, Bash

Implementers:

Must have: TaskCreate, TaskUpdate, TaskList, TaskGet, Read, Write, Edit
Often: Bash, Glob, Grep

Reviewers:

Must have: TaskCreate, TaskUpdate, TaskList, TaskGet, Read
Often: Glob, Grep, Bash
Never: Write, Edit

Command Frontmatter

yaml

---
description: |                 # Required: workflow description
  Full description of what this command does.
  Workflow: PHASE 1 → PHASE 2 → PHASE 3
allowed-tools: Task, Bash      # Required: comma-separated
skills: skill1, skill2         # Optional: referenced skills
---

Field Reference

Field	Required	Values	Description
`description`	Yes	Multi-line	Command purpose and workflow
`allowed-tools`	Yes	Tool list	Tools command can use
`skills`	No	Skill list	Referenced skills

Validation Checklist

Agent Frontmatter

Opening --- present
name is lowercase-with-hyphens
description includes 3+ examples
model is valid (sonnet/opus/haiku)
tools is comma-separated with spaces
Closing --- present
No YAML syntax errors

Command Frontmatter

Opening --- present
description explains workflow
allowed-tools includes Task, TaskCreate, TaskUpdate, TaskList, TaskGet for orchestrators
Closing --- present
No YAML syntax errors

Common Errors

Invalid YAML Syntax

yaml

# WRONG - missing colon
name agent-name

# CORRECT
name: agent-name

Incorrect Tool Format

yaml

# WRONG - no spaces after commas
tools: TaskCreate, TaskUpdate, TaskList, TaskGet,Read,Write

# CORRECT
tools: TaskCreate, TaskUpdate, TaskList, TaskGet, Read, Write

Missing Examples

yaml

# WRONG - too generic
description: Use this agent for development tasks.

# CORRECT
description: |
  Use this agent when implementing TypeScript features. Examples:
  (1) "Create a user service" - implements service with full CRUD
  (2) "Add validation" - adds Zod schemas to endpoints
  (3) "Fix type errors" - resolves TypeScript compilation issues

Files

Just SKILL.md in plugins/agentdev/skills/schemas of MadAppGang/claude-code.

Open the folder on GitHubat commit 6097ad4

Compare with similar skills

Schemas 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.

Schemas compared with similar skills
Skill	Stars	Used in	Tokens	Auto-check	Licence	Repo updated
Schemas this skillMadAppGang/claude-code	285	—	~1.1k	Automated safety check: Pass	MIT	7 mo ago
Hook Development for Claude Code Pluginsanthropics/claude-plugins-official	38k	10 repos	~4.1k	Automated safety check: Notes	Apache-2.0	today
Plugin Settings Patternanthropics/claude-plugins-official	38k	7 repos	~3k	Automated safety check: Pass	Apache-2.0	today
E2Ecallstack/react-native-pager-view	3.4k	3 repos	~2.1k	Automated safety check: Pass	MIT	2 days ago
Mole Bug Patternstw93/Mole	70k	—	~2k	Automated safety check: Pass	GPL-3.0	today
Neat-Freak Knowledge CloseoutKKKKhazix/khazix-skills	21k	—	~1.9k	Automated safety check: Pass	MIT	10 days ago

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Questions about Schemas

What does Schemas do?

YAML frontmatter schemas for Claude Code agents and commands. Schemas is an agent skill from MadAppGang/claude-code. YAML frontmatter schemas for Claude Code agents and commands.

When should I use Schemas?

Schemas fits situations like: validating agent/command files.

How do I install Schemas in Claude Code?

Run `npx skills add MadAppGang/claude-code --skill schemas -a claude-code`. Or copy the skill folder (plugins/agentdev/skills/schemas in MadAppGang/claude-code) into .claude/skills/schemas in your project. Claude Code loads it when a task matches its description.

How do I install Schemas in Codex?

Run `npx skills add MadAppGang/claude-code --skill schemas -a codex`. Or copy the skill folder (plugins/agentdev/skills/schemas in MadAppGang/claude-code) into .agents/skills/schemas in your project. Codex loads it when a task matches its description.

Can I use Schemas 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 MadAppGang/claude-code --skill schemas -a cursor` (or -a gemini-cli, github-copilot or opencode for the others). To copy it by hand, put the folder in .cursor/skills/schemas, .gemini/skills/schemas, .github/skills/schemas and .opencode/skills/schemas in your project.

What does Schemas need to run?

SKILL.md names no scripts, command-line tools or credentials: Schemas is instructions for the agent only.

Does Schemas 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 Schemas safe to install?

Our automated static check of SKILL.md found no risky patterns, such as piping downloads into a shell, reading credential files or hidden Unicode. It is not a guarantee. Review the folder before installing.

What licence does Schemas use?

Schemas 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 Schemas use?

About 1.1k tokens (SKILL.md is roughly 4.2k 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 Schemas?

Skills that share tags, products or a category with Schemas: Hook Development for Claude Code Plugins (anthropics/claude-plugins-official, 38k stars), Plugin Settings Pattern (anthropics/claude-plugins-official, 38k stars), E2E (callstack/react-native-pager-view, 3.4k stars) and Mole Bug Patterns (tw93/Mole, 70k stars). The comparison table on this page puts their stars, adoption, token cost, safety result and licence side by side.

Who maintains Schemas?

MadAppGang (a GitHub organization) maintains it in MadAppGang/claude-code, which has 285 GitHub stars. The repository holds 69 skills in this directory. The repository was last updated on March 15, 2026.

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

Install Schemas

Facts

At a glance

What it does

When your agent uses it

Example prompts

What it can do on your machine

Tool permissions

Runs code

Network

Credentials

Context cost

Safety

SKILL.md

Frontmatter Schemas

Agent Frontmatter

Field Reference

Color Guidelines

Tool Patterns by Agent Type

Command Frontmatter

Field Reference

Validation Checklist

Agent Frontmatter

Command Frontmatter

Common Errors

Invalid YAML Syntax

Incorrect Tool Format

Missing Examples

Files

Compare with similar skills

Similar skills

More from MadAppGang/claude-code

Related

Questions about Schemas