agent-development SKILL.md skillA

This file is byte-identical to the first copy the registry indexed, one of 5 indexed copies. Same content hash, so the same checks give both the same grade.

agent-development from anthropics/claude-plugins-official is an agent skill: a SKILL.md folder an AI agent loads when a task calls for it.

mdr add anthropics/claude-plugins-official/agent-development@v0.1.0

Pins v0.1.0 in mdr.lock. Pin the fingerprint instead.

Audit grade

A, 17 of 17 checks passed

Kind

SKILL.md skill

Repository

anthropics/claude-plugins-official

Path

plugins/plugin-dev/skills/agent-development/SKILL.md

Versions recorded

3

Latest version

v0.1.0, committed Apr 28, 2026

First version recorded

Nov 20, 2025

Size

11,168 bytes

Repository stars

43,118

License

Apache-2.0

This skill should be used when the user asks to "create an agent", "add an agent", "write a subagent", "agent frontmatter", "when to use description", "agent examples", "agent tools", "agent colors", "autonomous agent", or needs guidance on agent structure, system prompts, triggering conditions, or agent development best practices for Claude Code plugins.

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

# Agent Development for Claude Code Plugins

## Overview

Agents are autonomous subprocesses that handle complex, multi-step tasks independently. Understanding agent structure, triggering conditions, and system prompt design enables creating powerful autonomous capabilities.

**Key concepts:**
- Agents are FOR autonomous work, commands are FOR user-initiated actions
- Markdown file format with YAML frontmatter
- Triggering via description field with examples
- System prompt defines agent behavior
- Model and color customization

## Agent File Structure

### Complete Format

```markdown
---
name: agent-identifier
description: Use this agent when [triggering conditions]. Typical triggers include [scenario 1 in prose], [scenario 2 in prose], and [scenario 3 in prose]. See "When to invoke" in the agent body for worked scenarios.
model: inherit
color: blue
tools: ["Read", "Write", "Grep"]
---

You are [agent role description]...

## When to invoke

[Two to four representative scenarios written as prose, e.g.:]
- **[Scenario name].** [What the situation looks like and what the agent should do.]
- **[Scenario name].** [Same.]

**Your Core Responsibilities:**
1. [Responsibility 1]
…

Read the whole file at its exact version.

How to install

mdr add anthropics/claude-plugins-official/agent-development@sha256:6a2826571320828c

[![mdr](https://markdownregistry.com/badge/art_2cg3s4k5e3zgomaf.svg)](https://markdownregistry.com/a/art_2cg3s4k5e3zgomaf)

Versions

The registry has recorded 3 versions of this file, between Nov 20, 2025 and Apr 28, 2026, about one every 80 days.

Audit of the latest version

Source

API

GET https://markdownregistry.com/api/v1/artifacts/art_2cg3s4k5e3zgomaf
GET https://markdownregistry.com/api/v1/resolve?ref=anthropics/claude-plugins-official/agent-development
GET https://markdownregistry.com/api/v1/blob/6a2826571320828cc6f8f21ccd8e6eefd2bced62000c8c5e43a712c12e2d83a1

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.

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