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Message your other Claude Code sessions

code.claude.com

August 8, 2026

13 min read

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50/100

Summary

Claude Code v2.1.224 or later enables cross-session messaging on macOS and Linux without additional configuration. Users can discover reachable agents with ListAgents and send messages using the SendMessage tool to agents, subagents, and team members within a session.

Key Takeaways

Cross-session messaging is available in Claude Code v2.1.224 or later and operates on macOS and Linux without requiring additional activation.
Claude can autonomously send messages between sessions when it identifies relevant information, such as findings or status updates.
Message delivery outcomes include delivered, held, or refused, depending on the receiving session's inbound controls.
Users can discover which sessions Claude can reach by using the /list-agents command, which provides a list of reachable sessions and their names.

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Community Sentiment

Mixed

Positives

Users are thrilled about creating custom protocols that help their agents retain context, showing strong community ingenuity in optimizing AI interactions.
The idea of shared specialist subagents is generating excitement, as it minimizes token costs and enhances efficiency in handling complex tasks.
Commenters are sharing their own successful implementations, like using tmux and memory trees, which highlights the community's resourcefulness in improving AI performance.

Concerns

There's frustration over the lack of built-in features for context retention, with users wishing for a more seamless way to manage conversation histories.
Concerns are raised about the token penalties associated with invoking certain skills, indicating that the current systems still have significant limitations.