/agents opens the subagent manager — the configuration surface that lists every subagent Claude can delegate side-tasks to (built-in, project-scoped, and user-scoped) and lets you create or edit one.

Every time you ask Claude for “a fresh second opinion” on your code, you’d like a dedicated code-reviewer that always runs against main. You open /agents and add a project-scoped one, so it ships with the repo and the next engineer inherits it.

~/code/api  >  /agents

  Subagents
  ──────────────────────────────────────────────
    Built-in
      general-purpose
      Explore

    Project   ./.claude/agents/
    ▸ + create new

    User      ~/.claude/agents/
      code-reviewer

A subagent runs in its own context, so the side-task doesn’t crowd the main conversation. I keep each one narrow — a clear job, the tools it needs, nothing more. A reviewer that only reads and reports is safer to trust than one that can also edit.