swarm-coordination

name: swarm-coordination description: Coordinate multi-agent swarm workflows. Use when working in parallel with other agents, managing shared resources, or orchestrating distributed tasks. Covers conflict prevention, handoffs, and state synchronization.

Swarm Coordination

Protocols and patterns for consistent, conflict-free multi-agent development. Follow these guidelines when working alongside other Claude Code agents in the same codebase.

Core Principles

1. Beads as Source of Truth: All work items tracked via bd commands
2. File Locking: Hooks automatically manage file locks - respect them
3. Session Isolation: Each agent has a unique session ID for tracking
4. Clean Handoffs: Always leave state that another agent can continue

File-Based Output

Workers write results to scratchpad/<task-id>.md, not direct context. Only durable artifacts (ADRs, plans, PRDs) go to artifacts/. Orchestrator creates output targets before launching workers; workers write to assigned files; orchestrator reads and synthesizes.

Workflows

Starting Work

• Check Beads: Run bd ready to find unblocked issues
• Claim Work: Update issue status: bd update <id> --status in_progress
• Check Conflicts: Review .claude/hooks/.file-tracker.log for recent edits
• Coordinate: If another agent is active, coordinate via Beads comments

During Work

• Atomic Changes: Make small, complete changes that don't leave broken state
• Frequent Commits: Commit often to reduce merge conflicts
• Update Progress: Add comments to Beads issues for visibility
• Respect Locks: If a file is locked, wait or work on something else

Completing Work

• Run Tests: Verify changes don't break existing functionality
• Close Issue: bd close <id> --reason "Completed: <description>"
• Sync Beads: bd sync to share updates with other agents
• Clean State: Commit all changes, leave no uncommitted work

Conflict Prevention

File Lock Protocol

Hooks automatically acquire/release locks. If you encounter a lock:

# Check who holds the lock
cat .claude/hooks/.locks/<filename>.lock

# Lock automatically expires after 60 seconds
# If urgent, coordinate via Beads or wait

Merge Conflict Strategy

1. Pull frequently: Keep your branch up to date
2. Small PRs: Easier to merge than large changes
3. Coordinate: Use Beads to claim files/features before editing
4. Resolve quickly: Address conflicts immediately when detected

Communication Patterns

Handoff Message

When ending a session with incomplete work:

# Create handoff for next agent
echo '{"message": "Continue implementing auth middleware. Tests passing but needs error handling in src/auth.ts:45"}' > .claude/hooks/.state/handoff.json

Issue Comments (via Beads)

# Add context for other agents
bd comment <issue-id> "Implemented base class. Needs: validation, tests, docs"

Multi-Agent Patterns

Queen-Worker Pattern

For complex tasks, one agent orchestrates while others execute:

1. Queen: Plans, decomposes, assigns via Beads
2. Workers: Claim issues, implement, report completion
3. Sync Point: All workers sync before final integration

Parallel Streams

For independent features:

1. Create separate Beads issues for each stream
2. Each agent claims one stream
3. Avoid editing same files across streams
4. Merge streams at defined integration points

State Files

Best Practices

1. Check Before Edit: Always verify no active locks on target files
2. Complete Units: Finish logical units of work before switching
3. Document Intent: Use Beads issues to declare what you're working on
4. Test Locally: Run tests before pushing to catch issues early
5. Sync Often: Keep Beads and git in sync with other agents

Emergency Procedures

Deadlock Detection

If agents are waiting on each other:

# Check active sessions
ls -la .claude/hooks/.state/session_*.json

# Check active locks
ls -la .claude/hooks/.locks/

# Force release stale locks (use with caution)
find .claude/hooks/.locks -mmin +5 -delete

Recovery from Conflict

1. Save current work to a new branch
2. Sync with main: git fetch && git rebase origin/main
3. Resolve conflicts file by file
4. Update Beads: bd sync
5. Continue work

Integration with Beads

# View all open work
bd list --status open

# Get ready (unblocked) items
bd ready --sort hybrid

# Claim an issue
bd update <id> --status in_progress --assignee claude

# Add dependency
bd dep add <blocking-id> <blocked-id> --type blocks

# Complete work
bd close <id> --reason "Implemented feature X"

# Sync state
bd sync