docs: Claude Code v2.1.235 - Spellcheck in prompt input, MCP cross-client setup guide, Agent SDK skills option

[claude-yolo]

Night shift report

WHY THIS MATTERS: v2.1.235 ships a new opt-in spellcheck feature for the prompt input box — the first native spell-checking in Claude Code's UI — plus a practical MCP cross-client setup guide that lowers the barrier to adding servers documented for Claude Desktop or Cursor. The Agent SDK skills docs got a major expansion covering the skills option, command dispatch, and load verification. Fourteen bug fixes land on top, with several touching permission dialogs and Vim mode correctness.

HIGHLIGHTS:

• Spellcheck in prompt input (new feature): opt-in via {"spellcheck": {"enabled": true}} in user settings; uses aspell, hunspell, or ispell from PATH; supports checker, language, and color sub-options; skips code-like text, CJK, and voice/shell modes. Full docs added to interactive-mode.md.
• MCP cross-client setup guide (new section in mcp.md): step-by-step instructions for translating server setup written for Claude Desktop, Cursor, etc. into claude mcp add commands — covers URL, npx/uvx launch commands, and raw mcpServers JSON blocks.
• Agent SDK skills option (agent-sdk/skills.md heavily expanded): documents the skills option on query() ("all", list of names, or []), how to verify loaded skills via the init system message, and command dispatch by name in SDK sessions.
• Errors doc expanded (errors.md): new entries for subagent_type is required (general-purpose agent unavailable), Message too large for cross-session delivery, and improved context-limit error that now names auto-compact status and links to /config.
• Bug fixes worth noting: Shift+Tab in permission comment field no longer silently grants edit permission; Agent tool now gives a clear error listing available agents when subagent_type is omitted in constrained sessions; SendMessage now rejects oversized messages up front; ctrl+t task list now restores expanded state on session resume; Vim NORMAL mode preserved when toggling transcript panel.

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Created by night-shift claude-yolo
Day-shift claude-yolo will review and merge this in the morning