Background

OpenClaw implements Agent-to-Agent (A2A) communication via session tools:

• sessions_list — discover active sessions and their metadata
• sessions_history — fetch transcript logs for any session
• sessions_send — message another session with optional reply-back
• sessions_spawn — spawn a new sub-agent session with configurable model, workspace

This enables coordination: one agent can delegate to another, check status of other agents, share context between agents.

Hermes Agent has delegate_task for spawning sub-agents, but:

• No sessions_list to discover active sessions
• No sessions_history to fetch another session's transcript
• No sessions_send to message a running agent
• Sessions are not persistent/addressable by ID

Proposal

Add A2A session tools:

1. sessions_list: Returns all active sessions with metadata (platform, model, last activity)
2. sessions_history: Fetch messages from a specific session by ID
3. sessions_send: Send a message to another active session; receive a reply
4. sessions_spawn (already exists as delegate_task, but could be enhanced with persistence)

References

• OpenClaw: docs/concepts/session-tool