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Claude Code v2.1.224 adds self-hosted runners and cross-session messaging

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Anthropic has released Claude Code version 2.1.224, introducing significant new capabilities for deployment and session management alongside various bug fixes.

Added `claude self-hosted-runner` to allow Team and Enterprise plans to use custom machines or containers for running sessions.
Introduced cross-session messaging via `SendMessage`, enabling Claude Code sessions on any machine to discover and communicate with each other.
Added an `archive` plugin source that allows installing plugins from a zip over HTTPS without requiring git or npm.
Removed the 200-subagent-per-session spawn cap, allowing long-running sessions to create new agents without refusal.
Fixed issues with sandbox credential masking, project path resolution for long paths, and Remote Control connection stability.

These updates provide greater infrastructure flexibility for enterprise users and improve the reliability of session interactions and plugin management.

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