agent-dev SKILL.md skillA
agent-dev from andisab/swe-marketplace is an agent skill: a SKILL.md folder an AI agent loads when a task calls for it.
mdr add andisab/swe-marketplace/agent-dev@git:20260326.c644335Pins git:20260326.c644335 in mdr.lock. Pin the fingerprint instead.
- Audit grade
- A, 17 of 17 checks passed
- Kind
- SKILL.md skill
- Repository
- andisab/swe-marketplace
- Path
plugins/context-engineering/skills/agent-dev/SKILL.md- Versions recorded
- 1
- Latest version
- git:20260326.c644335, committed Mar 26, 2026
- Size
- 11,713 bytes
- Repository stars
- 21
- License
- MIT
Use this skill when creating or refining Claude Code sub-agent definitions. Helps design specialized AI assistants with proper YAML frontmatter, system prompts, tool access, and example-driven descriptions. Automatically invoked when user requests "create an agent", "design a sub-agent", "make a specialist", or mentions agent development. Ensures agents follow Anthropic best practices with focused responsibilities, discovery-optimized descriptions, and proper tool restrictions.
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 Dev Skill This skill helps create production-ready Claude Code sub-agent definitions following Anthropic's official specifications and best practices. ## Core Principles ### 1. Single Responsibility Each agent should have ONE clear purpose. Avoid creating multipurpose agents that try to do everything. **Good**: `postgres-expert` - PostgreSQL database management and optimization **Bad**: `database-expert` - All databases (too broad) ### 2. Discovery-Optimized Descriptions The `description` field is critical for Claude to discover when to use your agent. Include: - **What**: Clear statement of capabilities - **When**: Specific scenarios that trigger usage - **Examples**: Concrete usage patterns with user/assistant dialogue - **Trigger terms**: Keywords users might mention ### 3. Tool Restriction Strategy Grant only necessary tools following principle of least privilege: - **Omit `tools` field**: Inherits all tools from main conversation (use for general-purpose agents) - **Specify tools list**: Grant specific tools (use for focused/security-sensitive agents) ### 4. Model Selection Choose the right model for the task: …
Read the whole file at its exact version.
How to install
mdr add andisab/swe-marketplace/agent-dev@sha256:66ff8e416d64e2fbThe line at the top of this page pins the label git:20260326.c644335, which is what most people want. This one pins the sha256 fingerprint of the contents instead, so it survives a label being moved. Either way the exact version is written to mdr.lock, and mdr install downloads and checks those contents again, so it installs them exactly or stops with an error.
[](https://markdownregistry.com/a/art_rucetiy7l3btfvcm)
2 badge image fetches in 30 days. What the badge shows.
Versions
The registry has recorded 1 version of this file, committed on Mar 26, 2026.
Audit of the latest version
- pass: Frontmatter block present
- pass: Frontmatter declares a name
- pass: Frontmatter declares a description
- pass: Size between 200 bytes and 200 KB (11713 bytes)
- pass: No zero-width or bidi control characters
- pass: No instruction hidden inside an HTML comment
- pass: No link to an exfiltration or paste host
- pass: No credential-shaped string
- pass: No instruction to send local credentials anywhere
- pass: No text hidden with inline styles
- pass: No prompt-injection phrasing
- pass: No curl or wget piped into a shell
- pass: No recursive delete of root, home or parent
- pass: No instruction to read or print local credentials
- pass: No base64 blob over 200 characters
- pass: No link to a raw IP address
- pass: No script tag
Source
andisab/swe-marketplace · 21 stars · license MIT · pushed 2026-10-17 · branch main
API
GET https://markdownregistry.com/api/v1/artifacts/art_rucetiy7l3btfvcm GET https://markdownregistry.com/api/v1/resolve?ref=andisab/swe-marketplace/agent-dev GET https://markdownregistry.com/api/v1/blob/66ff8e416d64e2fbdb9a7c6850bc3cd51a8ccabab7ec011a095dc007063f91a5
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.