I just stumbled across this while auditing agent context. Claude Code Desktop (not CLI) sessions have a built in tool for listing and sending messages to other active sessions. It’s not quite seemless, you can’t be Auto / Bypass mode - you have to be in Ask Permission / Accept Edits and click an approval prompt every single time. But it’s useful for getting to agents that aren’t part of a team to share context. ccd_session_mgmt Tools for interacting with other CCD sessions (not the current one): list_sessions — lists your other active/archived sessions (sorted by recent activity) search_session_transcripts — full-text search across other sessions’ transcripts to find where a topic was previously discussed send_message — sends a message into another session (arrives as a labeled user turn with a backlink) archive_session — stops another session’s process and cleans up its worktree; always prompts for confirmation submitted by /u/junlim
Originally posted by u/junlim on r/ClaudeCode