Subagents

Lessons in this group, roughly in build order:

• what-are-subagents — A subagent is a separate Claude instance Claude Code spawns to handle a scoped job in its own context…
• defining-custom-subagents — A custom subagent is a single markdown file — YAML frontmatter (name, description, optional tools/model)…
• subagent-system-prompts-tools — The two levers that shape a custom subagent: the markdown body (its system prompt, defining role and…
• delegating-tasks-to-subagents — The practice of handing a scoped, self-contained job to a subagent — automatically by the main model, or…
• the-task-tool-parallelism — Task is the built-in tool that spawns a subagent; emitting several Task calls in one turn runs those…