A Claude Code Subagent Is a Markdown File
An X article by rody (@0x_rody), “How to Build Your First Claude Code Subagent in 15 Minutes,” makes the barrier-to-entry point: a working subagent (a code reviewer, a test writer, a security scanner, a documentation generator) can be built in under 15 minutes, because “each one is a markdown file with instructions at the top and a prompt at the bottom.”
The idea worth keeping is the demystification. Subagents sound like infrastructure, but the entire artifact is a text file: frontmatter declaring name, description, tools, and model, followed by the prompt that defines how the worker behaves. The cost of trying one is minutes, not days.
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Related
- Subagents Keep the Main Context Clean — the why behind the how: what you gain once that markdown file exists is context isolation and scoped permissions
- Skills Are the Unit of Reusable Expertise — the sibling artifact: skills and subagents are both expertise externalized as version-controlled text files