Claude Code subagents split development tasks into four AI roles
Claude Code users can now automate software development by assigning distinct roles—planning, implementation, review, and testing—to separate AI subagents. The method involves creating four Markdown definition files in a .claude/agents/ folder, each specifying the subagent’s name, description, tools, and model. The author tested this workflow to build a Breakout-style game, where the Planner…
What you can do with it
AI at Work →Build small prototypes with Claude Code subagents
What you get You can catch logic bugs and reduce manual review time.
Four subagents (Planner, Implementer, Reviewer, Tester) operate independently.
- Who for
- founders
- Cost
- included in a tool you already have
- Effort
- minutes
Use it for
- Build small prototypes
- Catch logic bugs
- Reduce manual review time
How to set it up · From the article
- Place four definition files (planner.md, implementer.md, reviewer.md, tester.md) in a `.claude/agents/` folder
- Define roles, tools, and models in each file (e.g., Opus for planning, Sonnet for testing)
- Issue requirements to the Planner and let the team execute sequentially
- Review final output and approve or request changes
Watch out Requires clear acceptance criteria and human oversight for large-scale projects
Key points from the news
- Four subagents (Planner, Implementer, Reviewer, Tester) handle distinct development tasks with separate context windows
- Definition files define roles, tools, and models; the author used Opus for planning/review and Sonnet for implementation/testing
- Bugs like double bounce logic were caught by the Reviewer, while the Tester validated edge cases in ~10 minutes
How to Use Claude Code Subagents! A Thorough Guide to Building an AI-Only Development Team with 4 Definition Files
note.com · 3 November 2026
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