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Agent Builder (build-agent)

Generates consistent, standards-compliant Claude Code sub-agent files from a short role description.

Dev & CodingIntermediate★ 302⑂ 34AI score 8/10Last updated: Aug 12, 2026

What it does

Takes a rough idea of a specialised role and produces a complete, deploy-ready agent markdown file.

  • Input triage: classifies your request as Minimal / Medium / Rich and only asks the questions that are actually missing.
  • Configuration coverage: role, tools and disallowedTools, model choice, permissionMode, memory scope, background/worktree execution, maxTurns, preloaded skills, MCP servers, hooks, and a UI color matched to the agent's purpose.
  • Overlap check: scans .claude/agents/ and warns if a similar agent already exists.
  • Enforced structure: fixed frontmatter field order, kebab-case names, core- prefix for team agents, <!-- <DO_NOT_TOUCH> --> and <!-- <MAY_EDIT> --> zones, no em-dashes, ~60 line soft limit.
  • Self-critique: a 13-point checklist run before the draft is shown, then file write plus a summary card on approval.

Who it's for

  • Claude Code users running several sub-agents who want a single consistent house style.
  • Teams standing up an orchestrator plus a core team of agents.
  • Anyone tired of re-reading the docs to remember every frontmatter option.

Examples

  1. "Build me a PR review agent" → suggests opus, read-only tool scope, purple color, writes .claude/agents/core-reviewer.md.
  2. "An agent that runs tests and summarises only failures" → asks about background execution and Bash scope, then writes the file and registers it in the orchestrator's editable zone.
  3. You ask for a "docs writing agent" but docs-writer already exists → it flags the overlap and proposes editing the existing agent instead.

· · · Install guide · · ·

Try it now, no install

Paste this into Claude to use the skill without installing anything.

Read the instructions in this file and follow them to help me:
https://raw.githubusercontent.com/LukeRenton/explore-claude-code/HEAD/.claude/skills/build-agent/SKILL.md

What I want: (describe your task here)

If Claude can't open the link, open it yourself and paste the contents instead.

↓ If it works for you, download the ZIP below and install it. Then it runs on its own — no pasting each time.

Install in the Claude app (no terminal)
  1. Download the ZIP with the button below.
  2. In Claude, open Settings → Capabilities and turn on 'Code execution and file creation'. (one time)
  3. Go to Customize → Skills → + → 'Upload a skill' and upload the ZIP.
↓ Download ZIP
Install in Claude Code

Let Claude do it — paste this into Claude Code

Install the skill I found on Claude Skill Mart.
Copy the .claude/skills/build-agent folder from the GitHub repo LukeRenton/explore-claude-code into my ~/.claude/skills/build-agent/.
When it's done, tell me in one line what this skill can do.

Install with a command instead

git clone https://github.com/LukeRenton/explore-claude-code.git /tmp/explore-claude-code && mkdir -p ~/.claude/skills/build-agent && cp -r /tmp/explore-claude-code/.claude/skills/build-agent/* ~/.claude/skills/build-agent/

⚠ This is a third-party skill. Check the source repository before installing.

  1. Open a terminal.
  2. Clone the repository: git clone https://github.com/LukeRenton/explore-claude-code.git /tmp/explore-claude-code
  3. Create the skill folder: mkdir -p ~/.claude/skills/build-agent
  4. Copy the files: cp -r /tmp/explore-claude-code/.claude/skills/build-agent/* ~/.claude/skills/build-agent/
  5. For project-only use, copy into .claude/skills/ at your project root instead of ~/.claude.
  6. Restart Claude Code, then say something like "create a new agent for X" to trigger the skill.
  7. Generated agents land in .claude/agents/, so make sure that directory exists (or let the skill create it).
View source on GitHub ↗License: MIT