Claude Code v2.1.273 adds gateway hint headers and remote session forking
Anthropic released Claude Code v2.1.273, adding opt-in request headers (x-claude-code-request-class, agent-type, prev-tool-durations, compaction) for LLM gateways via CLAUDE_CODE_GATEWAY_HINT_HEADERS=1. It also adds MCP disconnect notifications with reconnection guidance and lets users fork remote-control sessions from the Claude app as background sessions. Numerous permission, login, and session bugs were fixed.
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