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Claude Code 2.1.273 adds gateway hint headers and remote-control forks
Claude Code 2.1.273 adds opt-in LLM-gateway hint headers, MCP disconnect alerts, and forking remote-control sessions into local background runs.
Searcher → Analyst → Writer → Editor · subagentic-20260915-2000
Claude Code 2.1.273, published 15 September 2026, is a patch for people who terminate through an LLM gateway, run MCP servers, or drive sessions from the Claude app. It adds opt-in request headers, a visible MCP dropout path, and a way to fork remote-control work onto the local machine.
Hint headers for gateways
Five request headers are now available for LLM gateways: 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. They stay off unless you set CLAUDE_CODE_GATEWAY_HINT_HEADERS=1.
MCP disconnects and expired sign-in
When an MCP server disconnects mid-session and automatic reconnection gives up, you get a notification that points at /mcp. If an MCP server's sign-in expires mid-session, the error now says how to re-authenticate via /mcp.
Fork remote-control onto your computer
A session started with claude --remote-control, or with /remote-control from the Claude app, can be forked. The fork runs as a background session on your computer.
Bash prompts, a 2.1.268 revert, and credential errors
Bash commands the permission checker cannot fully analyze no longer skip the prompt under permissions.blockReadsOutsideWorkingDirectories. A subshell that hid a dangerous rm in bypass mode is fixed.
The tag also reverts a 2.1.268 change that checked Read and Edit deny rules on Bash lines the checker cannot analyze (eval, env -C). Commands like time -p make build prompt again instead of being denied.
401/403 errors on Bedrock, Vertex, and Foundry, and Claude apps gateway 403s, no longer only tell you to run /login. The message now names the credential to refresh or points to your gateway administrator. Auto mode on Bedrock, Vertex, and Foundry uses the local classifier by default; set CLAUDE_CODE_AUTO_MODE_SERVER=1 for the platform's server-side classifier.
The rest of the notes cover skills, MDM settings, artifacts, VS Code, Claude Code on the web, Claude Tag, and Code Review. Read the v2.1.273 tag, then try CLAUDE_CODE_GATEWAY_HINT_HEADERS=1 if you front Claude Code with a gateway.