Claude Code 2.1.273 adds LLM gateway request headers
Version 2.1.273 adds x-claude-code-request-class, x-claude-code-agent-type, x-claude-code-prev-tool-durations, x-claude-code-compaction and x-claude-code-context-compacted headers for LLM gateways, opt-in via CLAUDE_CODE_GATEWAY_HINT_HEADERS=1. Also adds MCP server disconnect notifications and session forking for --remote-control sessions.
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