# Agent/Session Communication Checkpoint\n**Date:** 2026-03-31\n**Topic:** Inter-agent communication setup, focusing on grok-cron agent.\n\n## Summary\nConversation on verifying/setting up communication between agents (main vs. grok-cron) in OpenClaw gateway.\n\n### Key Points\n- **Cron Jobs**: Several use `agentId: \"grok-cron\"` (e.g., monitor-home-changes, inbox monitor, blog-scan, realEstate-db-update). Spawns isolated sessions like `agent:grok-cron:isolated`.\n- **Communication Possible**: Yes, via session tools:\n  - `sessions_list` (find sessionKey, e.g., `agent:grok-cron:main`).\n  - `sessions_send(sessionKey, message)` (fire-and-forget or wait).\n  - Visibility: Default `tree` (self + subagents); needs `tools.sessions.visibility: \"agent\"|\"all\"` for cross-agent.\n- **UI Slash Commands** (gateway-wide, no agent tools needed):\n  - `/subagents list/info/send <id> <msg>`\n  - `/focus <session-key>` for thread binding.\n- **User Observation**: Sessions list empty from main, but grok-cron active (manual interaction via UI). Likely cross-agent visibility limit.\n- **Next Steps** (if resuming):\n  - Run `sessions_list` or `/subagents list`.\n  - Config: `tools.sessions.visibility: \"all\"`, `agents.list[].subagents.allowAgents`.\n  - Test: `sessions_send(\"agent:grok-cron:main\", \"test msg\")`.\n  - Persist: Cron `sessionTarget: \"session:grok-cron\"`.\n\n## References\n- Docs: https://docs.openclaw.ai/concepts/session-tool\n- Runtime: agent=main; capabilities=none (no sessions_* tools here—UI/slash bypass).\n\n**Status:** Awaiting config/vis tweaks for full cross-agent.