Swarm Troubleshooting

This skill provides comprehensive diagnostic and recovery procedures for swarm coordination issues.

Quick Troubleshooting Examples

Example 1: Spawn Failure

bash

# You try to spawn a teammate
/claude-swarm:swarm-spawn "backend-dev" "backend-developer" "sonnet" "..."
# Error: Could not find a valid kitty socket

# 1. Run diagnostics to identify the issue
/claude-swarm:swarm-diagnose my-team

# Output shows: kitty socket not found at expected location

# 2. Check kitty config
grep -E 'allow_remote_control|listen_on' ~/.config/kitty/kitty.conf

# 3. Fix: Add to kitty.conf if missing
# allow_remote_control yes
# listen_on unix:/tmp/kitty-$USER

# 4. Restart kitty completely and retry spawn

Example 2: Teammate Appears Active But Isn't Responding

bash

# 1. Check if teammates are actually alive
/claude-swarm:swarm-verify my-team
# Output: backend-dev: not found (session crashed)

# 2. Find status mismatches
/claude-swarm:swarm-reconcile my-team
# Output: backend-dev marked active but session missing - recommend removal

# 3. Resume the team (respawns offline members)
/claude-swarm:swarm-resume my-team

Example 3: Status Mismatch After System Restart

bash

# After rebooting, team config shows active but all sessions are gone

# 1. Check current state
/claude-swarm:swarm-status my-team
# Shows: 3 members active, but multiplexer shows no sessions

# 2. Reconcile to auto-detect mismatches
/claude-swarm:swarm-reconcile my-team --auto-fix
# Automatically marks offline sessions as inactive

# 3. Resume team to respawn all members
/claude-swarm:swarm-resume my-team

Quick diagnostic rule: Always start with /claude-swarm:swarm-diagnose <team> - it runs all health checks and points you to the specific issue.

Troubleshooting Delegated Teams

When using delegation mode (default), a spawned team-lead handles coordination. This affects how you troubleshoot.

Who Diagnoses What?

Issue Type	Who Should Diagnose	Commands
Team-lead unresponsive	You (orchestrator)	`/swarm-diagnose`, `/swarm-status`
Worker issues	Team-lead (first), then you	Ask team-lead to run `/swarm-diagnose`
Communication failures	Team-lead (first)	Ask team-lead to check and report
Task management issues	Team-lead	Team-lead manages tasks

Diagnosing When Team-Lead Is Active

If team-lead is working, ask them to diagnose:

bash

/claude-swarm:swarm-message team-lead "Please run /swarm-diagnose and report any issues"

# Or be more specific:
/claude-swarm:swarm-message team-lead "Worker backend-dev seems stuck. Can you verify they're alive and check their status?"

Why delegate diagnosis? Team-lead has full context of the team state and can both diagnose and fix issues directly.

Diagnosing When Team-Lead Is Unresponsive

If team-lead isn't responding, diagnose directly:

bash

# 1. Check team status
/claude-swarm:swarm-status my-team

# 2. Is team-lead alive?
# Look for "team-lead" in status output - does window exist?

# 3. Run full diagnostics
/claude-swarm:swarm-diagnose my-team

# 4. If team-lead crashed, respawn them
/claude-swarm:swarm-reconcile my-team
/claude-swarm:swarm-spawn "team-lead" "team-lead" "sonnet" "You are the team-lead. Check /swarm-inbox for context. Resume coordination."

When to Intervene Directly

Intervene yourself when:

Team-lead is unresponsive or crashed
Multiple workers are down and team-lead isn't handling it
Critical issue needs immediate resolution
You need to see raw status (not team-lead's summary)

Let team-lead handle when:

Individual worker issues (they can respawn)
Task reassignment (that's their job)
Communication failures between workers
Normal operational issues

Direct Intervention Commands

bash

# View raw team state (bypassing team-lead)
/claude-swarm:swarm-status my-team
/claude-swarm:task-list

# Diagnose directly
/claude-swarm:swarm-diagnose my-team

# Message workers directly (if team-lead down)
/claude-swarm:swarm-message backend-dev "Team-lead is unresponsive. What's your current status?"

# Broadcast to all (emergency)
/claude-swarm:swarm-broadcast "Team-lead is down. Please pause work and report status."

Diagnostic Approach

When Things Go Wrong

Swarm coordination involves multiple moving parts: multiplexers (tmux/kitty), Claude Code processes, file system state, and network communication. When issues arise, systematic diagnosis is essential.

First, identify the symptom category:

Spawn Issues - Can't create new teammates
Status Issues - Config doesn't match reality
Communication Issues - Messages not delivered
Task Issues - Task updates fail
Performance Issues - Slow response, high resource usage

Diagnostic Commands

Always start with diagnostics before attempting fixes:

bash

# Comprehensive health check - runs all diagnostics
/claude-swarm:swarm-diagnose <team-name>

# Check if teammates are actually alive
/claude-swarm:swarm-verify <team-name>

# Find and report status mismatches
/claude-swarm:swarm-reconcile <team-name>

# View current team state (members, tasks, multiplexer)
/claude-swarm:swarm-status <team-name>

What these commands check:

swarm-diagnose: Multiplexer availability, socket connectivity, config validity, file permissions, session health
swarm-verify: Compares config against live sessions, reports dead/zombie processes
swarm-reconcile: Identifies offline sessions marked active, suggests cleanup actions
swarm-status: Shows current state snapshot - use for quick health check

Diagnostic Decision Tree

Issue Detected
│
├─ Can't spawn teammates?
│  └─ Run: /claude-swarm:swarm-diagnose <team>
│     ├─ "Multiplexer not found" → Install tmux/kitty
│     ├─ "Socket not found" → Check kitty config, restart kitty
│     ├─ "Duplicate name" → Use unique name or check existing teammates
│     └─ "Timeout" → Check system resources, retry
│
├─ Status shows teammates but they're not responding?
│  └─ Run: /claude-swarm:swarm-verify <team>
│     └─ Shows "not found" → Sessions crashed
│        └─ Run: /claude-swarm:swarm-reconcile <team>
│           └─ Then: /claude-swarm:swarm-resume <team>
│
├─ Messages not being received?
│  └─ Check: /claude-swarm:swarm-status <team>
│     ├─ Teammate shows "offline" → Respawn teammate
│     ├─ Wrong agent name used → Check exact names
│     └─ Teammate not checking inbox → Send reminder
│
└─ Task commands failing?
   └─ Run: /claude-swarm:task-list
      └─ Verify task ID exists, check status values

## Common Issues

### Spawn Failures

Spawn failures are the most common issue when creating swarm teams. Understanding the spawn process helps diagnose failures quickly.

**How spawning works**:
1. Validate team name and agent name (no path traversal, special chars)
2. Detect multiplexer (kitty or tmux)
3. For kitty: Find valid socket, create window with environment variables
4. For tmux: Create new session with environment variables
5. Launch Claude Code process with model and initial prompt
6. Register window/session and update config
7. Wait for Claude Code to become responsive

**Symptoms of spawn failure**:
- `spawn_teammate` or `/claude-swarm:swarm-spawn` returns error
- Error messages about multiplexer not found
- Session/window creation fails
- Timeout waiting for teammate to start
- Process starts but immediately crashes

**Immediate diagnostic steps**:

1. **Check error output** - The error message usually indicates root cause
2. **Run diagnostics**:
```bash
/claude-swarm:swarm-diagnose <team-name>

Check system state:

bash

# For kitty users
kitten @ ls  # Should list windows without error

# For tmux users
tmux list-sessions  # Should list sessions without error

# Check Claude Code is working
claude --version  # Should show version number

Troubleshooting workflow:

Spawn Command Fails
│
├─ Error mentions "multiplexer"?
│  └─ YES → See "Multiplexer Not Available" below
│
├─ Error mentions "socket"?
│  └─ YES → See "Kitty Socket Issues" below
│
├─ Error mentions "duplicate" or "already exists"?
│  └─ YES → See "Duplicate Agent Names" below
│
├─ Error mentions "timeout"?
│  └─ YES → See "Session Creation Timeout" below
│
├─ Error mentions "invalid" or "path traversal"?
│  └─ YES → See "Path Traversal Validation" below
│
└─ No clear error but spawn fails silently?
   └─ Check: System resources, permissions, Claude Code installation

Common Causes:

1. Multiplexer Not Available

Error:

Error: Neither tmux nor kitty is available

Solution:

bash

# Install tmux (macOS)
brew install tmux

# Or install kitty
brew install --cask kitty

# Verify installation
which tmux  # or: which kitty

2. Duplicate Agent Names

Error:

Error: Agent name 'backend-dev' already exists in team

Solution:

bash

# Use unique names
/claude-swarm:swarm-spawn "backend-dev-2" "backend-developer" "sonnet" "..."

# Or check existing teammates first
/claude-swarm:swarm-status <team-name>

3. Kitty Socket Issues

Error (kitty):

Error: Could not find a valid kitty socket

Solution:

bash

# 1. Verify kitty config has remote control enabled
grep -E 'allow_remote_control|listen_on' ~/.config/kitty/kitty.conf
# Should show:
#   allow_remote_control yes
#   listen_on unix:/tmp/kitty-$USER

# 2. Check socket exists (kitty appends -PID to path)
ls -la /tmp/kitty-$(whoami)-*

# 3. Test socket connectivity
kitten @ ls

# 4. Restart kitty completely if needed (not just reload)

# 5. Or manually set socket path
export KITTY_LISTEN_ON=unix:/tmp/kitty-$(whoami)-$KITTY_PID

Note: Kitty creates sockets at /tmp/kitty-$USER-$PID. The plugin auto-discovers the correct socket, but if you have multiple kitty instances, you may need to set KITTY_LISTEN_ON explicitly.

Deep dive on kitty socket discovery:

The spawn process tries sockets in this order:

$KITTY_LISTEN_ON environment variable (if set and valid)
Cached socket from previous successful connection
/tmp/kitty-$USER-$KITTY_PID (exact match for current kitty)
All /tmp/kitty-$USER-* sockets (newest first)
/tmp/kitty-$USER (fallback)
/tmp/mykitty and /tmp/kitty (alternative locations)

Each socket is validated with kitten @ --to $socket ls before use. If validation fails, the search continues.

Multiple kitty instances troubleshooting:

If you have multiple kitty windows open:

bash

# List all kitty sockets
ls -la /tmp/kitty-$(whoami)-*

# Example output:
# /tmp/kitty-user-12345  (kitty window 1)
# /tmp/kitty-user-67890  (kitty window 2)

# Test each socket
kitten @ --to unix:/tmp/kitty-user-12345 ls
kitten @ --to unix:/tmp/kitty-user-67890 ls

# Set the correct socket for your team-lead window
export KITTY_LISTEN_ON=unix:/tmp/kitty-$(whoami)-$KITTY_PID

Configuration file location varies:

Linux: ~/.config/kitty/kitty.conf
macOS: ~/.config/kitty/kitty.conf or ~/Library/Preferences/kitty/kitty.conf
Check with: kitty --debug-config | grep "Config file"

Common kitty config issues:

Config exists but not loaded: Kitty requires full restart (CMD+Q, not just close window)
Socket path has spaces: Use quotes in listen_on directive
Multiple listen_on directives: Only the last one takes effect
Incorrect syntax: Must be listen_on unix:/path, not listen_on /path

Example working kitty.conf:

# ~/.config/kitty/kitty.conf
allow_remote_control yes
listen_on unix:/tmp/kitty-$USER
# Note: $USER expands at kitty startup, then -$PID is appended automatically

Socket permission issues:

bash

# Check socket permissions
ls -la /tmp/kitty-$(whoami)-*
# Should show: srw------- (socket, owner read-write-execute only)

# If permissions are wrong:
# 1. Kill kitty completely
# 2. Remove old sockets: rm /tmp/kitty-$(whoami)-*
# 3. Restart kitty (will recreate with correct permissions)

4. Path Traversal Validation

Error:

Error: Invalid team name (path traversal detected)

Solution:

bash

# Use simple team names without special characters
# Good: "auth-team", "feature-x", "bugfix_123"
# Bad: "../other-team", "team/name", "team..name"

5. Session Creation Timeout

Error:

Error: Timeout waiting for teammate session to start

Solution:

bash

# Retry once (may be transient)
/claude-swarm:swarm-spawn "agent-name" ...

# Check system resources
top  # Look for high CPU/memory usage

# Verify multiplexer is responsive
tmux list-sessions  # or: kitty @ ls

Recovery Steps:

Identify which spawn failed - Check error messages
Run diagnostics - Use swarm-diagnose
Fix underlying issue - Install multiplexer, fix permissions, etc.
Retry spawn - Same command should work after fix
Verify success - Use swarm-verify
Adjust plan if persistent - Reduce team size or reassign tasks

Status Mismatches

Symptoms:

Config shows teammate as "active" but session is dead
Session exists but not in config
Conflicting status information

Diagnosis:

bash

/claude-swarm:swarm-reconcile <team-name>

This will report:

Offline sessions still marked active
Zombie config entries
Active sessions not in config
Status inconsistencies

Common Causes:

1. Teammate Session Crashed

Detection:

bash

# Config shows active, but session doesn't exist
/claude-swarm:swarm-verify <team-name>
# Output: "Error: Session swarm-team-agent not found"

Solution:

bash

# Run reconcile to update status
/claude-swarm:swarm-reconcile <team-name>

# Respawn the teammate
/claude-swarm:swarm-spawn "agent-name" "agent-type" "model" "prompt"

# Or resume the team (respawns all offline)
/claude-swarm:swarm-resume <team-name>

2. Manual Session Kill

Detection: User manually killed tmux/kitty session outside of cleanup command

Solution:

bash

# Reconcile will detect and fix
/claude-swarm:swarm-reconcile <team-name>

# Respawn if needed
/claude-swarm:swarm-spawn "agent-name" ...

3. Incomplete Cleanup

Detection: Sessions killed but config files remain

Solution:

bash

# Run cleanup properly
/claude-swarm:swarm-cleanup <team-name> --force

# Or manually remove config
rm ~/.claude/teams/<team-name>/config.json

Communication Failures

Symptoms:

Messages not received by teammates
Inbox shows no messages when some were sent
Message command succeeds but teammate never sees it

Diagnosis:

bash

# Check team status
/claude-swarm:swarm-status <team-name>

# Verify teammate is alive
/claude-swarm:swarm-verify <team-name>

# Check inbox manually
cat ~/.claude/teams/<team-name>/inboxes/<agent-name>.json

Common Causes:

1. Teammate Not Checking Inbox

Solution:

Remind teammates to run /claude-swarm:swarm-inbox regularly
Include inbox check in teammate initial prompts
Send follow-up message or use broadcast

2. Wrong Agent Name

Error:

Error: Agent 'backend' not found in team

Solution:

bash

# Check exact agent names
/claude-swarm:swarm-status <team-name>

# Use exact name from status output
/claude-swarm:swarm-message "backend-dev" "message"  # Not "backend"

3. Inbox File Corruption

Symptoms: Inbox command fails or shows garbled output

Solution:

bash

# Back up current inbox
cp ~/.claude/teams/<team-name>/inboxes/<agent>.json ~/.claude/teams/<team-name>/inboxes/<agent>.json.bak

# Reset inbox
echo '[]' > ~/.claude/teams/<team-name>/inboxes/<agent>.json

# Notify sender to resend messages

Task Management Issues

Symptoms:

Task updates not reflected in task list
Cannot assign task to teammate
Task IDs don't match

Diagnosis:

bash

# View current tasks
/claude-swarm:task-list

# Check task file directly
cat ~/.claude/tasks/<team-name>/tasks.json

Common Causes:

1. Invalid Task ID

Error:

Error: Task #99 not found

Solution:

bash

# List tasks to see valid IDs
/claude-swarm:task-list

# Use correct ID from list
/claude-swarm:task-update 3 --status "in-progress"

2. Invalid Status Value

Error:

Error: Invalid status 'done'

Solution:

bash

# Use valid status values:
# - pending
# - in-progress
# - blocked
# - in-review
# - completed

/claude-swarm:task-update 3 --status "completed"  # Not "done"

3. Assigning to Non-Existent Agent

Error:

Error: Agent 'frontend' not found in team

Solution:

bash

# Check exact agent names
/claude-swarm:swarm-status <team-name>

# Use exact name
/claude-swarm:task-update 3 --assign "frontend-dev"

Team Creation Issues

Symptoms:

Team creation fails
Directory permission errors
Config file not created

Diagnosis:

bash

# Check if team directory exists
ls -la ~/.claude/teams/<team-name>/

# Check permissions
ls -la ~/.claude/teams/

Common Causes:

1. Team Already Exists

Error:

Error: Team 'my-team' already exists

Solution:

bash

# Choose different name
/claude-swarm:swarm-create "my-team-2" "description"

# Or cleanup old team first
/claude-swarm:swarm-cleanup "my-team" --force

2. Permission Denied

Error:

Error: Permission denied creating ~/.claude/teams/my-team/

Solution:

bash

# Fix permissions on Claude directory
chmod 700 ~/.claude/
chmod 700 ~/.claude/teams/

# Retry creation
/claude-swarm:swarm-create "my-team" "description"

3. Invalid Team Name

Error:

Error: Invalid team name

Solution:

bash

# Use alphanumeric with hyphens/underscores
# Good: "feature-auth", "bugfix_123", "team2"
# Bad: "../team", "team name", "team/123"

Recovery Strategies

Choosing the right recovery strategy depends on the severity of the issue, how much work would be lost, and whether the team can continue working. This section provides decision-making guidance for recovery scenarios.

Recovery Decision Tree

Problem Diagnosed
│
├─ Are teammates still working successfully?
│  └─ YES → Use Soft Recovery (minimal disruption)
│     ├─ 1-2 teammates offline → Respawn just those teammates
│     ├─ Status mismatch only → Run reconcile
│     └─ Communication issue → Fix inbox, notify teammates
│
├─ Is critical work in progress?
│  └─ YES → Evaluate data loss risk
│     ├─ Work saved to files/commits? → Safe to use Hard Recovery
│     ├─ Work only in memory/history? → Try Partial Recovery first
│     └─ Uncertain? → Ask teammates to save work first
│
├─ Is the team completely non-functional?
│  └─ YES → Assess what can be salvaged
│     ├─ Tasks/config readable? → Use Partial Recovery
│     ├─ Files corrupted? → Use Hard Recovery
│     └─ Everything broken? → Nuclear option (full reset)
│
└─ Is this a persistent/recurring issue?
   └─ YES → After recovery, investigate root cause
      ├─ Check system resources (disk, memory, CPU)
      ├─ Review multiplexer logs
      └─ Consider reducing team size

Soft Recovery

When to use:

1-3 teammates offline, rest working fine
Status mismatch after manual session kill
Communication failures that don't affect work
Post-crash recovery where work is saved

What's preserved:

All task data and comments
Inbox messages
Team configuration
Work completed by active teammates

What's affected:

Offline teammates lose in-memory history (but can resume from files)
May need to re-explain context to respawned teammates

Step-by-step soft recovery:

Identify offline teammates:

bash

/claude-swarm:swarm-status <team-name>
# Look for members showing "no window" with config "active"

Run reconcile to update status:

bash

/claude-swarm:swarm-reconcile <team-name>
# This marks offline sessions as offline in config

Decide on respawn strategy:

bash

# Option A: Respawn specific teammate
/claude-swarm:swarm-spawn "agent-name" "agent-type" "model" "Continue where you left off: [context]"

# Option B: Resume entire team (respawns all offline)
/claude-swarm:swarm-resume <team-name>

Verify recovery:

bash

/claude-swarm:swarm-verify <team-name>
# All teammates should show as active

Notify team of recovery:

bash

# Via bash function
source "${CLAUDE_PLUGIN_ROOT}/lib/swarm-utils.sh" 1>/dev/null
broadcast_message "<team-name>" "Recovery complete. Team member [name] has been respawned. Continue your work."

Example soft recovery scenario:

Situation: 5-teammate team, 2 teammates crashed mid-work

1. $ /claude-swarm:swarm-status my-team
   Output shows:
   - team-lead: active (you)
   - frontend-dev: active ✓
   - backend-dev: active ✗ (no window)
   - tester: active ✗ (no window)
   - reviewer: active ✓

2. $ /claude-swarm:swarm-reconcile my-team
   Output:
   - Marked backend-dev as offline
   - Marked tester as offline

3. $ /claude-swarm:swarm-resume my-team
   Output:
   - Respawning: backend-dev
   - Respawning: tester
   - Both spawned successfully

4. $ /claude-swarm:swarm-verify my-team
   Output: All teammates active ✓

5. Message team: "backend-dev and tester were respawned after crash. Please continue your assigned tasks."

Result: Team back to full capacity in ~60 seconds, no data lost

Hard Recovery

When to use:

Entire team is non-functional
Config files corrupted or inconsistent
After failed migration or upgrade
When soft recovery fails multiple times
Starting over is faster than debugging

What's lost:

Task comments and progress notes
Inbox messages (unread and read)
lastSeen timestamps
Team history

What's preserved:

Task subjects and descriptions (if you note them first)
Codebase changes (if committed to git)
Your knowledge of work completed

Before hard recovery checklist:

bash

# 1. Save task list for reference
/claude-swarm:task-list > tasks-backup.txt

# 2. Check for uncommitted work
git status

# 3. Ask teammates to commit their work (if any are responsive)
/claude-swarm:swarm-message "backend-dev" "Commit your work immediately, team restart needed"

# 4. Back up configs (optional)
cp ~/.claude/teams/<team-name>/config.json ~/config-backup.json

# 5. Document current state
/claude-swarm:swarm-status <team-name> > status-backup.txt

Step-by-step hard recovery:

Full cleanup (kills all sessions, optionally removes files):

bash

/claude-swarm:swarm-cleanup <team-name> --force

Verify cleanup:

bash

# Check no sessions remain
tmux list-sessions | grep <team-name>  # Should be empty
# or for kitty:
kitten @ ls | grep swarm-<team-name>   # Should be empty

# Check team directory
ls ~/.claude/teams/<team-name>/
# Should not exist if --force was used

Recreate team:

bash

/claude-swarm:swarm-create <team-name> "Team description"

Recreate tasks from backup:

bash

# Recreate each task manually
/claude-swarm:task-create "Implement API endpoints" "Full description..."
/claude-swarm:task-create "Write unit tests" "Test coverage for..."
# ... repeat for all tasks

Respawn teammates:

bash

/claude-swarm:swarm-spawn "backend-dev" "backend-developer" "sonnet" "You are the backend developer. Focus on: [task details]"
/claude-swarm:swarm-spawn "frontend-dev" "frontend-developer" "sonnet" "You are the frontend developer. Focus on: [task details]"
# ... repeat for all teammates

Assign tasks:

bash

/claude-swarm:task-update 1 --assign "backend-dev"
/claude-swarm:task-update 2 --assign "frontend-dev"

Verify team health:

bash

/claude-swarm:swarm-verify <team-name>
/claude-swarm:swarm-status <team-name>

Timeline: Hard recovery typically takes 5-10 minutes for a 5-teammate team.

Partial Recovery

When to use:

Specific component broken (one inbox, one task file)
Soft recovery too cautious, hard recovery too destructive
You know exactly what's broken and how to fix it
Testing fixes before full recovery

Techniques:

Reset Specific Inbox

When: Inbox file corrupted, messages malformed, inbox command errors

bash

# Back up current inbox first
cp ~/.claude/teams/<team-name>/inboxes/<agent>.json ~/.claude/teams/<team-name>/inboxes/<agent>.json.bak

# Reset to empty inbox
echo '[]' > ~/.claude/teams/<team-name>/inboxes/<agent>.json

# Verify format
cat ~/.claude/teams/<team-name>/inboxes/<agent>.json
# Should output: []

# Notify affected teammate
/claude-swarm:swarm-message "<agent>" "Your inbox was reset due to corruption. Please check your backup if you need message history."

Fix Specific Task

When: Task file has invalid status, corrupted JSON, missing fields

bash

# Back up task file
cp ~/.claude/tasks/<team-name>/<id>.json ~/.claude/tasks/<team-name>/<id>.json.bak

# Fix manually with jq
jq '.status = "in-progress"' ~/.claude/tasks/<team-name>/<id>.json > /tmp/task-fixed.json
mv /tmp/task-fixed.json ~/.claude/tasks/<team-name>/<id>.json

# Or edit directly
# Edit the JSON file to fix the issue

# Verify task is valid
cat ~/.claude/tasks/<team-name>/<id>.json | jq '.'
# Should output valid JSON

Respawn Single Teammate

When: One teammate crashed, others working fine

bash

# 1. Check teammate is really offline
/claude-swarm:swarm-verify <team-name>

# 2. Update their status
/claude-swarm:swarm-reconcile <team-name>

# 3. Check their assigned tasks
/claude-swarm:task-list
# Note which tasks were assigned to this teammate

# 4. Respawn with context
/claude-swarm:swarm-spawn "<agent-name>" "<agent-type>" "<model>" "You crashed mid-work. Resume: [describe what they were doing, which files they were editing, what tasks to continue]"

# 5. Reassign their tasks
/claude-swarm:task-update <task-id> --assign "<agent-name>"
/claude-swarm:task-update <task-id> --comment "Teammate respawned, resuming work"

# 6. Notify teammate of their context
/claude-swarm:swarm-message "<agent-name>" "You were working on: [specific context]. Check Task #<id> for details."

Fix Config-Reality Mismatch

When: Config shows wrong status, but files and sessions are fine

bash

# Use reconcile for automatic fixing
/claude-swarm:swarm-reconcile <team-name> --auto-fix

# Or manual fix if you know the issue
# Edit config.json directly:
# 1. Back up: cp ~/.claude/teams/<team-name>/config.json ~/config-backup.json
# 2. Edit: jq '(.members[] | select(.name == "agent-name")) |= (.status = "active")' config.json > config-fixed.json
# 3. Replace: mv config-fixed.json ~/.claude/teams/<team-name>/config.json

Recovery Strategy Selection Guide

Symptom	Data Loss Risk	Recommended Strategy	Recovery Time
1 teammate offline	None	Soft (respawn one)	30 seconds
Multiple offline	None	Soft (resume team)	1-2 minutes
Status mismatch only	None	Soft (reconcile)	10 seconds
Inbox corruption	Messages lost	Partial (reset inbox)	30 seconds
Task file corrupt	Comments lost	Partial (fix task)	1-2 minutes
Config corrupt	History lost	Hard (recreate)	5-10 minutes
Everything broken	All lost	Hard (full reset)	10-15 minutes
Persistent failures	Depends	Diagnose root cause first	Varies

When to Escalate

Some issues require more than recovery:

Signs you need to investigate deeper:

Recovery works but issue recurs within minutes
Multiple teammates crash simultaneously
Errors mention "out of memory" or "too many open files"
System becomes unresponsive during spawning
Kitty/tmux behaves erratically

Investigation steps:

bash

# Check system resources
top
# Look for: high CPU usage, low free memory, swap usage

# Check disk space
df -h ~/.claude
# Ensure adequate free space (>1GB recommended)

# Check file descriptor limits
ulimit -n
# Should be >=256, ideally >=1024

# Check for zombie processes
ps aux | grep claude
# Kill any orphaned Claude Code processes

# Review system logs
# macOS: Console.app, filter for "claude" or "kitty"
# Linux: journalctl --user | grep claude

Prevention Best Practices

Prevention is significantly easier than recovery. Following these practices reduces issues by 80-90%.

1. Verify After Creation

Why this matters: Spawn failures may not be immediately obvious. A teammate might appear to spawn successfully but crash seconds later, or spawn without proper environment variables set.

Verification workflow:

bash

# After spawning team, ALWAYS verify
/claude-swarm:swarm-verify <team-name>

# Expected output for healthy team:
# Verifying team 'my-team'...
# ✓ team-lead (team-lead) - session active
# ✓ backend-dev (backend-developer) - session active
# ✓ frontend-dev (frontend-developer) - session active
# All teammates verified successfully!

# Check detailed status
/claude-swarm:swarm-status <team-name>

What to look for:

All teammates show "active" status
All sessions exist (check "window exists" or "session active")
No status mismatches
Multiplexer responds quickly

If verification fails immediately after spawn:

bash

# Wait 5-10 seconds for Claude Code to fully initialize
sleep 10
/claude-swarm:swarm-verify <team-name>

# If still failing, check what's wrong
/claude-swarm:swarm-diagnose <team-name>

2. Use Slash Commands

Slash commands have built-in validation, error handling, and safer parameter parsing compared to direct bash function calls.

Comparison:

bash

# Slash command (RECOMMENDED)
/claude-swarm:swarm-spawn "backend-dev" "backend-developer" "sonnet" "Implement API"

# Direct bash function (AVOID unless necessary)
source "${CLAUDE_PLUGIN_ROOT}/lib/swarm-utils.sh" 1>/dev/null
spawn_teammate "team" "backend-dev" "backend-developer" "sonnet" "Implement API"

Slash command advantages:

Validates all parameters before execution
Provides clear error messages
Handles edge cases (special characters, quotes, etc.)
Consistent behavior across different shells
Integrated with Claude Code's permission system

When bash functions are acceptable:

In custom scripts combining multiple operations
When you need direct access to return values
For operations with no slash command equivalent
When debugging library functions

3. Handle Errors Gracefully

Never retry blindly - understand why it failed first:

bash

# BAD: Blind retry loop
for i in {1..5}; do
    /claude-swarm:swarm-spawn "agent" "worker" "sonnet" "prompt" && break
done

# GOOD: Diagnose then fix
if ! /claude-swarm:swarm-spawn "agent" "worker" "sonnet" "prompt"; then
    echo "Spawn failed, diagnosing..."
    /claude-swarm:swarm-diagnose <team-name>

    # Read diagnostic output, fix the issue, then retry once
    # Example: Install missing multiplexer, fix socket, etc.

    # Retry after fix
    /claude-swarm:swarm-spawn "agent" "worker" "sonnet" "prompt"
fi

Error handling best practices:

Capture and log errors:

bash

if ! /claude-swarm:swarm-spawn "agent" "worker" "sonnet" "prompt" 2> spawn-error.log; then
    echo "Spawn failed. Error log:"
    cat spawn-error.log
    # Now you have error details for debugging
fi

Set reasonable timeouts:

bash

# Don't wait forever for unresponsive operations
timeout 30s /claude-swarm:swarm-verify <team-name>

Validate prerequisites:

bash

# Before spawning team, check prerequisites
if [[ "$(detect_multiplexer)" == "none" ]]; then
    echo "Error: No multiplexer available. Install tmux or kitty first."
    exit 1
fi

4. Regular Health Checks

For long-running teams (multiple hours or days), periodic health checks prevent gradual degradation.

Recommended check frequency:

Every 15-30 minutes during active development
After major operations (spawning multiple teammates, large file changes)
Before assigning new critical tasks
When teammates seem unresponsive

Health check script:

bash

#!/bin/bash
# save as: health-check.sh

TEAM="$1"

echo "=== Health Check: $TEAM ==="
echo ""

# Check for status drift
echo "Checking for status mismatches..."
/claude-swarm:swarm-reconcile "$TEAM"

# Verify all teammates
echo ""
echo "Verifying teammate sessions..."
/claude-swarm:swarm-verify "$TEAM"

# Check task progress
echo ""
echo "Task summary..."
/claude-swarm:task-list | grep -E "in-progress|blocked"

# Done
echo ""
echo "Health check complete!"

Automated monitoring (for critical/long-running teams):

bash

# Add to cron or run in background
while true; do
    /claude-swarm:swarm-verify <team-name> || {
        echo "Health check failed at $(date)"
        /claude-swarm:swarm-diagnose <team-name>
        # Send notification, page on-call, etc.
    }
    sleep 900  # Check every 15 minutes
done

5. Clean Up Properly

Why proper cleanup matters:

Prevents orphaned sessions consuming resources
Avoids name collisions when recreating teams
Maintains clean state for future teams
Prevents "team already exists" errors

Cleanup best practices:

bash

# Standard cleanup (safe, preserves files for reference)
/claude-swarm:swarm-cleanup <team-name>

# This kills sessions but leaves:
# - Config files
# - Task files
# - Inbox files
# - Logs

# Force cleanup (removes everything)
/claude-swarm:swarm-cleanup <team-name> --force

# This kills sessions AND removes:
# - ~/.claude/teams/<team-name>/
# - ~/.claude/tasks/<team-name>/

When to use each:

Standard cleanup: Team finished, might reference later, or debugging needed
Force cleanup: Team failed, won't use again, or need clean slate

What NOT to do:

bash

# NEVER manually delete while sessions are running
rm -rf ~/.claude/teams/<team-name>/  # Leaves orphaned sessions!

# NEVER kill sessions without cleanup
tmux kill-session -t swarm-<team>-<agent>  # Leaves config!

# ALWAYS use cleanup commands
/claude-swarm:swarm-cleanup <team-name>

Cleanup verification:

bash

# After cleanup, verify nothing remains
tmux list-sessions | grep <team-name>  # Should be empty
ls ~/.claude/teams/<team-name>/       # Should not exist (if --force used)

6. Monitor Resource Usage

Why monitoring matters: Large teams (5+ teammates) can consume significant resources. Each Claude Code process uses:

~500MB RAM (varies by model)
1-2 CPU cores during active work
File descriptors for sockets, logs, files

Resource monitoring:

bash

# Check total Claude Code memory usage
ps aux | grep claude | awk '{sum+=$4} END {print "Total memory: " sum "%"}'

# Count active Claude processes
ps aux | grep claude | wc -l

# Check file descriptor usage
lsof -p $(pgrep claude) | wc -l

# Monitor system load
uptime
# Load average should be below CPU core count

Resource limits:

Team Size	RAM Needed	Recommended System
2-3 teammates	2-3 GB	8GB RAM minimum
4-6 teammates	3-5 GB	16GB RAM recommended
7-10 teammates	6-8 GB	32GB RAM recommended
10+ teammates	10+ GB	Not recommended without testing

When to scale back:

System swap usage increases significantly
CPU load average > number of cores
Teammates become slow/unresponsive
Frequent crashes or timeouts

bash

# Reduce team size gracefully
# 1. Finish critical tasks
# 2. Have teammates commit work
# 3. Kill non-essential teammates
/claude-swarm:swarm-cleanup <team-name>  # Only kills sessions for specific agents

# 4. Consolidate work across fewer teammates

7. Initialize Teammates With Clear Context

Problem: Respawned teammates don't know what they were doing

Solution: Provide comprehensive initial prompts

Bad initial prompt:

bash

/claude-swarm:swarm-spawn "backend-dev" "backend-developer" "sonnet" "Work on the backend"

Good initial prompt:

bash

/claude-swarm:swarm-spawn "backend-dev" "backend-developer" "sonnet" "You are the backend developer for team my-team. Your tasks: 1) Implement /api/users endpoint in src/api/users.ts, 2) Add database schema in migrations/. Current status: API routes defined, need implementation. Coordinate with frontend-dev for API contract. Check Task #3 for full requirements."

Initial prompt template:

You are the [ROLE] for team [TEAM_NAME].

Your assigned tasks:
1. [TASK_1] - [STATUS]
2. [TASK_2] - [STATUS]

Current state:
- [What's done]
- [What's in progress]
- [What's blocked/dependencies]

Key files:
- [FILE_1]: [Description]
- [FILE_2]: [Description]

Coordinate with:
- [TEAMMATE_1]: [for what]
- [TEAMMATE_2]: [for what]

First action: [Specific next step]

8. Document Team Architecture

For teams lasting >1 hour, document the architecture:

bash

# Create team docs
cat > ~/.claude/teams/<team-name>/README.md <<EOF
# Team: <team-name>

## Purpose
[What this team is building]

## Members
- team-lead: Orchestration, task assignment
- backend-dev: API implementation, database
- frontend-dev: UI components, styling
- tester: Test coverage, QA

## Task Breakdown
- Task #1: [Description] - assigned to backend-dev
- Task #2: [Description] - assigned to frontend-dev
- Task #3: [Description] - assigned to tester

## Dependencies
- Task #2 depends on Task #1 (API contract)
- Task #3 depends on Task #1, #2 (working features)

## Recovery Notes
- If backend-dev crashes: They were editing src/api/, check git status
- If frontend-dev crashes: They were in src/components/, state in localStorage
EOF

This documentation is invaluable for recovery scenarios.

Performance Troubleshooting

Slow or Unresponsive Teammates

Symptoms:

Teammates take >30 seconds to respond to messages
Commands timeout frequently
High CPU or memory usage
System fans running constantly

Diagnosis:

bash

# Check Claude Code process resource usage
ps aux | grep claude | sort -k3 -r  # Sort by CPU%
ps aux | grep claude | sort -k4 -r  # Sort by memory%

# Check individual teammate resource usage
# Find PID of specific teammate:
ps aux | grep "CLAUDE_CODE_AGENT_NAME=backend-dev"

# Monitor live resource usage
top -pid $(pgrep -f "CLAUDE_CODE_AGENT_NAME=backend-dev")

Common causes and solutions:

Too many teammates for system resources:

bash

# Solution: Reduce team size, use lighter models
# Replace opus with sonnet, sonnet with haiku for non-critical tasks
/claude-swarm:swarm-spawn "tester" "tester" "haiku" "Run existing tests"

Memory leaks in long-running teammates:

bash

# Solution: Periodic restarts for long-lived teammates (>4 hours)
# 1. Ask teammate to commit work
# 2. Kill and respawn
# 3. Reassign tasks

Disk I/O bottleneck:

bash

# Check disk I/O
iostat -x 1 5  # Run 5 samples, 1 second apart
# Look for high %util on disk with ~/.claude

# Solution: Move ~/.claude to faster disk (SSD)
# Or reduce concurrent file operations

Multiplexer Performance Issues

Kitty slowness:

bash

# Check kitty window count
kitten @ ls | jq '[.[].tabs[].windows[]] | length'
# If >50 windows total, kitty may slow down

# Solution: Use SWARM_KITTY_MODE=os-window for separate processes
export SWARM_KITTY_MODE=os-window
/claude-swarm:swarm-spawn ...

Tmux slowness:

bash

# Check tmux session count
tmux list-sessions | wc -l
# If >20 sessions, consider cleanup

# Solution: Clean up old swarm sessions
for session in $(tmux list-sessions -F '#{session_name}' | grep swarm-); do
    # Check if session is active in a team
    # If not, kill it
    tmux kill-session -t "$session"
done

Network or API Rate Limiting

Symptoms:

Claude API errors mentioning "rate limit"
Teammates getting "429 Too Many Requests"
Intermittent connection failures

Solutions:

bash

# 1. Reduce team size to stay under rate limits
# 2. Stagger teammate spawning (wait 10s between spawns)
for agent in backend frontend tester; do
    /claude-swarm:swarm-spawn "$agent" ...
    sleep 10
done

# 3. Use haiku model for lightweight tasks (lower API load)
/claude-swarm:swarm-spawn "tester" "tester" "haiku" "Run unit tests"

Debugging Hangs and Freezes

Teammate completely frozen:

bash

# 1. Find the teammate's process
ps aux | grep "CLAUDE_CODE_AGENT_NAME=backend-dev"

# 2. Send SIGTERM (graceful shutdown)
kill <PID>

# 3. If still frozen after 30s, force kill
kill -9 <PID>

# 4. Clean up and respawn
/claude-swarm:swarm-reconcile <team-name>
/claude-swarm:swarm-spawn "backend-dev" ...

Multiplexer frozen:

bash

# Kitty frozen
# 1. Try sending command
kitten @ ls
# If hangs, kill kitty: killall kitty

# Tmux frozen
# 1. Try listing sessions
tmux list-sessions
# If hangs, kill tmux server: tmux kill-server

Emergency Procedures

Nuclear Option: Full Reset

When to use: Everything is completely broken, no recovery methods work, starting over is the only option.

WARNING: This destroys ALL team data across ALL teams. Only use as absolute last resort.

What gets destroyed:

All team configurations
All task data and history
All inbox messages
All team directories
Active sessions (teammates will crash)

Before nuking:

bash

# 1. Save what you can
tar -czf ~/swarm-backup-$(date +%Y%m%d-%H%M%S).tar.gz ~/.claude/teams/ ~/.claude/tasks/

# 2. Document current state
/claude-swarm:swarm-list-teams > ~/teams-backup.txt
for team in $(cat ~/teams-backup.txt); do
    /claude-swarm:swarm-status "$team" > ~/${team}-status.txt
    /claude-swarm:task-list >> ~/${team}-tasks.txt
done

# 3. Notify any responsive teammates
# (They'll lose their work context)

Full reset procedure:

bash

# 1. Kill all swarm sessions
tmux kill-server  # Kills ALL tmux sessions
# or for kitty:
for window in $(kitten @ ls | jq -r '.[].tabs[].windows[] | select(.user_vars | keys[] | startswith("swarm_")) | .id'); do
    kitten @ close-window --match "id:$window"
done

# 2. Remove all swarm data
rm -rf ~/.claude/teams/
rm -rf ~/.claude/tasks/

# 3. Verify cleanup
ls ~/.claude/teams/  # Should not exist
ls ~/.claude/tasks/  # Should not exist

# 4. Recreate directories with proper permissions
mkdir -p ~/.claude/teams/
mkdir -p ~/.claude/tasks/
chmod 700 ~/.claude/teams/
chmod 700 ~/.claude/tasks/

# 5. Start fresh with new team
/claude-swarm:swarm-create "new-team" "Fresh start after full reset"

# 6. Verify clean state
/claude-swarm:swarm-status "new-team"

After nuclear reset:

All previous teams are gone
Need to recreate tasks from memory/notes
Teammates need complete context re-explanation
Good opportunity to optimize team structure

Recovery timeline: 15-30 minutes to rebuild team from scratch.

Debugging Commands

For deep investigation:

bash

# List all tmux sessions
tmux list-sessions

# Attach to specific teammate session (view their work)
tmux attach-session -t swarm-<team>-<agent>

# Check socket status
ls -la ~/.claude/sockets/

# View raw config
cat ~/.claude/teams/<team-name>/config.json

# View raw tasks
cat ~/.claude/tasks/<team-name>/tasks.json

# View raw inbox
cat ~/.claude/teams/<team-name>/inboxes/<agent>.json

Environment Variables

When debugging, these environment variables are set for spawned teammates:

Variable	Description
`CLAUDE_CODE_TEAM_NAME`	Current team name
`CLAUDE_CODE_AGENT_ID`	Agent's unique UUID
`CLAUDE_CODE_AGENT_NAME`	Agent name (e.g., "backend-dev")
`CLAUDE_CODE_AGENT_TYPE`	Agent role type
`CLAUDE_CODE_TEAM_LEAD_ID`	Team lead's UUID
`CLAUDE_CODE_AGENT_COLOR`	Agent display color
`KITTY_LISTEN_ON`	Kitty socket path (kitty only)

User-configurable:

Variable	Description	Default
`SWARM_MULTIPLEXER`	Force "tmux" or "kitty"	Auto-detect
`SWARM_KITTY_MODE`	Kitty spawn mode	`split`

Quick Reference

Issue	Quick Fix
Spawn fails	Run `/claude-swarm:swarm-diagnose`
Status mismatch	Run `/claude-swarm:swarm-reconcile`
Session crashed	Run `/claude-swarm:swarm-resume`
Messages not received	Verify agent name, check inbox
Invalid task ID	Run `/claude-swarm:task-list` to see IDs
Team creation fails	Check permissions, use valid name
Kitty socket not found	Check `listen_on` in kitty.conf, restart kitty
Cleanup incomplete	Use `--force` flag

Related Skills

swarm-orchestration - User/orchestrator workflow for creating teams and delegating
swarm-team-lead - Guidance for spawned team-leads on coordination
swarm-teammate - Guidance for workers within a swarm

Reference Documentation

For more detailed information, see the error-handling reference documentation.

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SKILL.md

Swarm Troubleshooting

Quick Troubleshooting Examples

Example 1: Spawn Failure

Example 2: Teammate Appears Active But Isn't Responding

Example 3: Status Mismatch After System Restart

Troubleshooting Delegated Teams

Who Diagnoses What?

Diagnosing When Team-Lead Is Active

Diagnosing When Team-Lead Is Unresponsive

When to Intervene Directly

Direct Intervention Commands

Diagnostic Approach

When Things Go Wrong

Diagnostic Commands

Diagnostic Decision Tree

1. Multiplexer Not Available

2. Duplicate Agent Names

3. Kitty Socket Issues

4. Path Traversal Validation

5. Session Creation Timeout

Status Mismatches

1. Teammate Session Crashed

2. Manual Session Kill

3. Incomplete Cleanup

Communication Failures

1. Teammate Not Checking Inbox

2. Wrong Agent Name

3. Inbox File Corruption

Task Management Issues

1. Invalid Task ID

2. Invalid Status Value

3. Assigning to Non-Existent Agent

Team Creation Issues

1. Team Already Exists

2. Permission Denied

3. Invalid Team Name

Recovery Strategies

Recovery Decision Tree

Soft Recovery

Hard Recovery

Partial Recovery

Reset Specific Inbox

Fix Specific Task

Respawn Single Teammate

Fix Config-Reality Mismatch

Recovery Strategy Selection Guide

When to Escalate

Prevention Best Practices

1. Verify After Creation

2. Use Slash Commands

3. Handle Errors Gracefully

4. Regular Health Checks

5. Clean Up Properly

6. Monitor Resource Usage

7. Initialize Teammates With Clear Context

8. Document Team Architecture

Performance Troubleshooting

Slow or Unresponsive Teammates

Multiplexer Performance Issues

Network or API Rate Limiting

Debugging Hangs and Freezes

Emergency Procedures

Nuclear Option: Full Reset

Debugging Commands

Environment Variables

Quick Reference

Related Skills

Reference Documentation