Claude docs changes for January 17th, 2026 [diff]

New Claude Code versions

Added new Setup hook event that can be triggered via --init, --init-only, or --maintenance CLI flags for repository setup and maintenance operations
Added keyboard shortcut 'c' to copy OAuth URL when browser doesn't open automatically during login

Improved startup to capture keystrokes typed before the REPL is fully ready
Improved file suggestions to show as removable attachments instead of inserting text when accepted
[VSCode] Added install count display to plugin listings
[VSCode] Added trust warning when installing plugins

Fixed a crash when running bash commands containing heredocs with JavaScript template literals like ${index + 1}

Added information about the new CLAUDE_AUTOCOMPACT_PCT_OVERRIDE environment variable for triggering compaction earlier than the default 95% threshold. [line 57] [Source]

Added new spinnerTipsEnabled setting to show/hide tips in the spinner while Claude is working. [line 163] [Source]
Added new terminalProgressBarEnabled setting to enable/disable the terminal progress bar in Windows Terminal and iTerm2. [line 164] [Source]
Added new CLAUDE_AUTOCOMPACT_PCT_OVERRIDE environment variable to control when auto-compaction triggers. [line 768] [Source]
Added new CLAUDE_CODE_EXIT_AFTER_STOP_DELAY environment variable for automated workflows using SDK mode. [line 776] [Source]
Added new CLAUDE_CODE_PROXY_RESOLVES_HOSTS environment variable for proxy DNS resolution. [line 777] [Source]
Updated CLAUDE_CODE_MAX_OUTPUT_TOKENS description with default (32,000) and maximum (64,000) values, plus note about context window impact. [line 784] [Source]
Added new FORCE_AUTOUPDATE_PLUGINS environment variable to force plugin auto-updates. [line 807] [Source]
Added new IS_DEMO environment variable to enable demo mode for streaming/recording. [line 810] [Source]
Renamed BashOutput tool to TaskOutput for retrieving output from background tasks (bash shell or subagent). [line 832] [Source]
Added new MCPSearch tool for searching and loading MCP tools when tool search is enabled. [line 838] [Source]

Added information about CLAUDE_AUTOCOMPACT_PCT_OVERRIDE environment variable for controlling subagent auto-compaction threshold. [line 550] [Source]

Complete rewrite of the MCP documentation with improved structure and new sections. [Source]
Renamed document from "MCP in the SDK" to "Connect to external tools with MCP". [line 1] [Source]
Added new Quickstart section with working example using Claude Code documentation MCP server. [lines 9-36] [Source]
Added "Allow MCP tools" section explaining tool naming conventions and permissions. [lines 84-135] [Source]
Added "MCP tool search" section for dynamic tool loading with ENABLE_TOOL_SEARCH configuration. [lines 209-245] [Source]
Added "Authentication" section covering environment variables, HTTP headers, and OAuth2. [lines 247-333] [Source]
Added working examples for listing GitHub issues and querying databases. [lines 335-419] [Source]
Added "Troubleshooting" section for common MCP issues. [lines 456-496] [Source]

Removed dontAsk permission mode from available modes. [line 53] [Source]
Added plan permission mode that prevents tool execution (Claude plans without making changes). [lines 55, 111-115] [Source]

Added note that clarifying questions are especially common in plan mode, making it ideal for interactive workflows. [line 196] [Source]

Added Go code example for file upload with the Anthropic SDK. [lines 27-55] [Source]