Claude docs changes for January 24th, 2026 [diff]

Executive Summary

New versions 2.1.18-2.1.19: Customizable keyboard shortcuts with chord sequences and $0/$1 argument shorthands for skills
Skills without extra permissions no longer require user approval before execution
Many new MCP servers added and code intelligence plugins documentation expanded with LSP tool support

Added customizable keyboard shortcuts with support for context-specific keybindings and chord sequences. Run /keybindings to configure.

Added environment variable CLAUDE_CODE_ENABLE_TASKS to allow reverting to the old system temporarily by setting to false
Added shorthand $0, $1, etc. for accessing individual arguments in custom commands
[SDK] Added replay of queued_command attachment messages as SDKUserMessageReplay events when replayUserMessages is enabled
[VSCode] Enabled session forking and rewind functionality for all users

Changed skills without additional permissions or hooks to be allowed without requiring approval
Changed indexed argument syntax from $ARGUMENTS.0 to $ARGUMENTS[0] (bracket syntax)

Fixed crashes on processors without AVX instruction support
Fixed dangling Claude Code processes when terminal is closed by catching EIO errors from process.exit() and using SIGKILL as fallback
Fixed /rename and /tag not updating the correct session when resuming from a different directory (e.g., git worktrees)
Fixed resuming sessions by custom title not working when run from a different directory
Fixed pasted text content being lost when using prompt stash (Ctrl+S) and restore
Fixed agent list displaying "Sonnet (default)" instead of "Inherit (default)" for agents without an explicit model setting
Fixed backgrounded hook commands not returning early, potentially causing the session to wait on a process that was intentionally backgrounded
Fixed file write preview omitting empty lines

Added recommendation to install code intelligence plugins for typed languages to give Claude precise symbol navigation and automatic error detection after edits. [line 329] [Source]

Added tip to install code intelligence plugins for precise "go to definition" and "find references" navigation when exploring the codebase. [line 125] [Source]

Added new section on installing code intelligence plugins for typed languages, explaining how they reduce token usage by providing precise symbol navigation instead of text-based search and reporting type errors automatically after edits. [lines 88-90] [Source]

Updated code intelligence plugins description to clarify they enable Claude Code's built-in LSP tool. [line 43] [Source]
Added Kotlin language server (kotlin-lsp) to the code intelligence plugins table. [line 52] [Source]
Added new section explaining what Claude gains from code intelligence plugins: automatic diagnostics after file edits and code navigation capabilities. [lines 64-71] [Source]
Added code intelligence troubleshooting section covering language server startup issues, high memory usage, and false positive diagnostics in monorepos. [lines 434-438] [Source]

Changed custom_instructions parameter mapping from --system-prompt to --append-system-prompt in the breaking changes reference and examples. [lines 79, 117]

Added new "Code intelligence" category to the built-in tools table, describing type error detection, jump to definitions, and find references capabilities (requires code intelligence plugins). [line 31] [Source]

Replaced "Explorium Business Data Hub" with "Harmonic" MCP server for discovering, researching, and enriching companies and people. [lines 79-83] [Source]
Added new "VibeProspecting" MCP server for finding company & contact data. [lines 103-106] [Source]
Added new "Ahrefs" MCP server for SEO & AI search analytics. [lines 149-152] [Source]
Added new "AirOps" MCP server for crafting content that wins AI search. [lines 154-157] [Source]
Added new "Amplitude" MCP server for searching, accessing, and getting insights on Amplitude data. [lines 159-162] [Source]
Added new "Pigment" MCP server for analyzing business data. [lines 377-378] [Source]
Added new "Similarweb Website Traffic" MCP server for real-time web analytics & competitive intelligence. [lines 387-390] [Source]
Added new "WordPress.com" MCP server for secure AI access to manage WordPress.com sites. [lines 443-446] [Source]

Updated ANTHROPIC_FOUNDRY_BASE_URL example to include /anthropic suffix in the URL path. [line 70] [Source]

Added ANTHROPIC_FOUNDRY_BASE_URL environment variable for specifying full base URL for Foundry resource as alternative to ANTHROPIC_FOUNDRY_RESOURCE. [line 851] [Source]
Added ANTHROPIC_FOUNDRY_RESOURCE environment variable documentation explaining it's required if ANTHROPIC_FOUNDRY_BASE_URL is not set. [line 852] [Source]
Added CLAUDE_CODE_ENABLE_TELEMETRY environment variable for enabling OpenTelemetry data collection. [line 874] [Source]
Added LSP tool to the tools available to Claude, describing automatic diagnostics and code navigation capabilities requiring code intelligence plugins. [line 945] [Source]

Replaced "Explorium Business Data Hub" with "Harmonic" MCP server for discovering, researching, and enriching companies and people. [lines 55-61] [Source]
Added new "VibeProspecting" MCP server for finding company & contact data. [lines 95-101] [Source]
Added new "Ahrefs" MCP server for SEO & AI search analytics. [lines 165-171] [Source]
Added new "AirOps" MCP server for crafting content that wins AI search. [lines 173-179] [Source]
Added new "Pigment" MCP server for analyzing business data. [lines 519-523] [Source]
Added new "Similarweb Website Traffic" MCP server for real-time web analytics & competitive intelligence. [lines 541-547] [Source]
Added new "WordPress.com" MCP server for secure AI access to manage WordPress.com sites. [lines 609-615] [Source]