Team Lead (coordinates, delegates, reviews)
  ├── Teammate 1 (owns task A, messages lead + peers)
  ├── Teammate 2 (owns task B, messages lead + peers)
  └── Teammate 3 (owns task C, messages lead + peers)
      │
      └── Shared: task list + mailbox + file locks

Key difference from subagents: Teammates are full Claude Code sessions. They have their own context window, can use all tools, and message each other directly — not just report back to a parent.

Team Sizing

Team Size	Best For
2	One builds, one reviews
3-5	Parallel features across layers (API, UI, tests)
> 5	Coordination overhead outweighs parallelism

3-5 teammates is the productive range. Beyond that, the lead spends more time coordinating than the team saves.

Task granularity: Aim for 5-6 tasks per teammate. Fewer means underutilization; more means excessive context switching.

Display Modes

In-process navigation:

Shift+Down — cycle through teammates (wraps around)
See each teammate's current task and output

Split-pane (recommended for >2 teammates):

tmux: tmux split-window -h per teammate
iTerm2: Cmd+D for vertical split
Each pane runs its own claude session

Task Management

Tasks flow through states:

pending → in-progress → completed
              │
              └── blocked (waiting on dependency)

Task Decomposition

Break work into units that:

Touch non-overlapping files
Can be verified independently
Have clear done criteria

Good decomposition:

Task 1: Add rate limiting middleware (src/middleware/rate-limit.ts)
Task 2: Add rate limit tests (tests/rate-limit.test.ts)
Task 3: Update API docs for rate limit headers (docs/api.md)
Task 4: Add Redis config for rate limit store (src/config/redis.ts)

Bad decomposition:

Task 1: Implement rate limiting
Task 2: Fix rate limiting bugs
Task 3: Improve rate limiting

Dependencies

Tasks can declare dependencies:

Task 3 (API docs) → depends on Task 1 (middleware)
Task 2 (tests) → depends on Task 1 (middleware)
Task 4 (Redis config) → no dependencies

Teammates pick up unblocked tasks automatically.

File-Lock Claiming

Teammates claim files before editing to prevent conflicts:

Teammate checks if file is locked
If free, claims it (file-lock-based)
Edits the file
Releases lock on task completion

If two teammates need the same file, one waits or the lead reassigns.

Plan Approval

Teammates plan before implementing:

Teammate receives task
Writes a brief plan (files to change, approach)
Lead reviews plan
Lead approves or redirects
Teammate implements

This prevents wasted work from misunderstood requirements.

Delegate Mode

Shift+Tab toggles delegate mode for the lead:

Lead coordinates only — no direct code edits
All implementation delegated to teammates
Lead reviews, approves plans, manages task flow

Hook Events

Hook	Fires When
TeammateIdle	A teammate finishes its task and has no pending work
TaskCreated	New task added to the shared list
TaskCompleted	A teammate marks a task done

Use these to trigger notifications, auto-assign next tasks, or run integration tests when all tasks complete.

When to Use Teams vs Alternatives

Scenario	Use
Parallel work on non-overlapping files	Agent teams
Quick background exploration	Subagent
Isolated feature branch work	Worktree (`claude -w`)
Competing approaches to same problem	Worktrees (compare results)
Cross-layer changes (API + UI + tests)	Agent teams
One-off delegation	Subagent with `isolation: worktree`
Large-scale migration (20+ files)	`/batch` command

Anti-Patterns

More than 5 teammates — coordination overhead dominates
Tasks that share mutable state or the same files
Skipping plan approval — leads to rework
Lead doing implementation instead of coordinating (use delegate mode)
Not setting dependencies — teammates race on coupled tasks

Example Session

Lead: "We need rate limiting. Breaking into 4 tasks."

  Task 1: middleware implementation → Teammate 1
  Task 2: Redis config → Teammate 2 (no deps)
  Task 3: tests → Teammate 1 (after Task 1)
  Task 4: API docs → Teammate 2 (after Task 1)

Teammate 1 plans → Lead approves → implements Task 1
Teammate 2 plans → Lead approves → implements Task 2
Task 1 completes → unblocks Tasks 3 and 4
Teammate 1 picks up Task 3, Teammate 2 picks up Task 4
All complete → Lead runs integration tests → commits

Docs

https://code.claude.com/docs/agent-teams

agent-teams

Agent Teams

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Architecture