Agent Development SKILL.md skillA
Agent Development from nxtg-ai/forge-plugin is an agent skill: a SKILL.md folder an AI agent loads when a task calls for it.
mdr add nxtg-ai/forge-plugin/Agent Development@git:20260714.4fd0952Pins git:20260714.4fd0952 in mdr.lock. Pin the fingerprint instead.
- Audit grade
- A, 17 of 17 checks passed
- Kind
- SKILL.md skill
- Repository
- nxtg-ai/forge-plugin
- Path
plugins/nxtg-forge/skills/agent-development/SKILL.md- Versions recorded
- 5
- Latest version
- git:20260714.4fd0952, committed Jul 14, 2026
- First version recorded
- Feb 7, 2026
- Size
- 10,976 bytes
- Repository stars
- 6
- License
- MIT
Author and configure Claude Code subagents — valid YAML frontmatter (name, description, model, color, tools, isolation, memory, skills) plus a system-prompt body. Use when creating a new agent .md, fixing an agent that won't load or won't auto-delegate, choosing a model/color, deciding which tools an agent gets, or reviewing agent frontmatter for invalid/ignored fields.
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 Guide How to author a Claude Code subagent that loads, auto-delegates, and runs with the right tools. Ground every new agent against the 33 real agents in this plugin (`agents/*.md`) — copy a close match and adapt, don't start from a blank file. ## Where agents live - **Plugin agents** (shipped): `plugins/nxtg-forge/agents/<name>.md`. - **Project-local agents** (a user's repo): `.claude/agents/<name>.md`. - **Personal agents** (all your projects): `~/.claude/agents/<name>.md`. An agent is a single markdown file: YAML frontmatter (config) + body (the system prompt). ## Frontmatter — valid fields only ```yaml --- name: builder # REQUIRED. lowercase + digits + hyphens, ≤64 chars. No uppercase, no underscores. description: | # REQUIRED. When Claude should delegate here. Add <example> blocks. Use this agent when ... This includes: ... <example> Context: ... user: "..." assistant: "I'll use the Task tool to launch the builder agent to ..." <commentary>Why builder is the right pick.</commentary> </example> model: sonnet # optional. sonnet | opus | haiku. Omit to inherit the main thread's model. …
Read the whole file at its exact version.
How to install
mdr add nxtg-ai/forge-plugin/Agent Development@sha256:4efe2df0b06527d0The line at the top of this page pins the label git:20260714.4fd0952, 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_c2udsf7iswtgcjqn)
4 badge image fetches in 30 days. What the badge shows.
Versions
The registry has recorded 5 versions of this file, between Feb 7, 2026 and Jul 14, 2026, about one every 39 days.
| version | committed | commit | size | audit | |
|---|---|---|---|---|---|
| git:20260714.4fd0952 latest | 2026-07-14 | 4fd0952 | 10,976 B | A | view · diff |
| git:20260308.688ea23 | 2026-03-08 | 688ea23 | 10,614 B | A | view · diff |
| git:20260304.dea3f4e | 2026-03-04 | dea3f4e | 10,620 B | A | view · diff |
| git:20260302.a0017e8 | 2026-03-02 | a0017e8 | 9,219 B | A | view · diff |
| git:20260207.88c1f6e | 2026-02-07 | 88c1f6e | 9,216 B | A | view |
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 (10976 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
nxtg-ai/forge-plugin · 6 stars · license MIT · pushed 2026-10-15 · branch main
API
GET https://markdownregistry.com/api/v1/artifacts/art_c2udsf7iswtgcjqn GET https://markdownregistry.com/api/v1/resolve?ref=nxtg-ai/forge-plugin/Agent Development GET https://markdownregistry.com/api/v1/blob/4efe2df0b06527d04d22ffd17eb91fc304c3032ed1feb2eb5250a4626e228a37
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.