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name: using-agent-relay description: Use when coordinating multiple AI agents in real-time - provides inter-agent messaging via tmux wrapper (sub-5ms latency) or file-based team inbox for async workflows

Using agent-relay

Overview

Real-time agent-to-agent messaging. Two modes: tmux wrapper (real-time, sub-5ms) and file-based team (async, simpler).

When to Use

• Multiple agents coordinating on shared codebase
• Turn-based interactions (games, reviews, task handoff)
• Parallel task distribution
• Real-time Claude/Codex/Gemini collaboration

Don't use: Single agent, cross-host networking, guaranteed delivery required.

Quick Reference

Pattern	Description
->relay:Name <<<...>>>	Default format - always use fenced format
->relay:* <<<...>>>	Broadcast to all agents
[[RELAY]]{"to":"Name","body":"msg"}[[/RELAY]]	Structured JSON
\->relay:	Escape (literal output)
relay read <id>	Read truncated message

CLI Commands

relay -f                    # Start daemon + dashboard
relay --status              # Check daemon
relay --stop                # Stop daemon
relay wrap -n Alice claude  # Wrap agent with messaging
relay read abc123           # Read truncated message

Team Commands (file-based)

relay team send -n You -t Recipient -m "Message"
relay team send -n You -t "*" -m "Broadcast"
relay team check -n You --no-wait     # Non-blocking
relay team check -n You --clear       # Clear after read
relay team status                     # Show team

Sending Messages (Tmux Mode)

Output the pattern directly - don't use bash commands. Always use the fenced format:

->relay:BlueLake <<<
I've finished the API refactor.>>>

->relay:* <<<
STATUS: Starting auth module.>>>

Fenced Format (Default)

The fenced format is the default for all messages:

->relay:Reviewer <<<
REVIEW REQUEST: Auth Module

Please check:
- src/auth/login.ts
- src/auth/session.ts

Key changes:
1. Added JWT validation
2. Fixed session expiry>>>

CRITICAL: Always end with >>> at the end of the last line of content! The <<< opens, >>> closes.

Limits: Fenced messages max 200 lines. For longer content, send summary with reference ID.

Fallback: If you forget >>>, message auto-closes on double blank line.

Pattern Rules

Pattern must be at line start (whitespace/prefixes OK):

->relay:Name message          # Works
  ->relay:Name message        # Works
- ->relay:Name message        # Works
Some text ->relay:Name msg    # Won't work

Receiving Messages

Messages appear as:

Relay message from Alice [abc123]: Message here

Truncated Messages

Long messages show [TRUNCATED...]. Read full content:

relay read abc123

Rule: If message ends abruptly, always read full message before responding.

Coordination Patterns

# Task assignment
->relay:Developer <<<
TASK: Implement /api/register>>>

# Status broadcast
->relay:* <<<
STATUS: Starting auth module>>>

->relay:* <<<
DONE: Auth complete>>>

# Review request
->relay:Reviewer <<<
REVIEW: src/auth/*.ts>>>

# Question
->relay:Architect <<<
QUESTION: JWT or sessions?>>>

# Blocked
->relay:* <<<
BLOCKED: Need DB credentials>>>

Spawning Agents

Any agent can spawn worker agents to delegate tasks:

# Spawn a worker
->relay:spawn WorkerName cli "task description"

# Examples
->relay:spawn Dev1 claude "Implement the login endpoint"
->relay:spawn Tester claude "Write unit tests for auth module"

# Release when done
->relay:release WorkerName

Workers run in separate tmux windows and can communicate back via ->relay: patterns.

Multi-Project Bridge

# Bridge multiple projects
relay bridge ~/auth ~/frontend ~/api

# Cross-project messaging
@relay:projectId:agent Message
@relay:*:lead Broadcast to leads

Common Mistakes

Mistake	Fix
Using bash to send real-time messages	Output ->relay: directly as text
Messages not sending	relay --status to check daemon
Incomplete message content	relay read <id> for full text
Pattern not at line start	Move ->relay: to beginning
Forgetting to clear inbox	Use --clear flag

Troubleshooting

relay --status                    # Check daemon
relay --stop && relay -f          # Restart
ls -la /tmp/agent-relay.sock      # Verify socket