Claude Code 2.1.217 Adds Emoji Autocomplete and Fixes an MCP Memory Leak
Claude Code 2.1.217 adds emoji shortcode autocomplete, warns when transcript writes fail instead of losing sessions silently, and fixes a memory leak from truncated MCP tool outputs.
What it is
The v2.1.217 release of Claude Code, Anthropic's CLI coding agent, following close on the heels of the 2.1.216 quadratic-slowdown fix.
What it does
It adds `:heart:`-style emoji shortcode autocomplete in the prompt input (toggleable via `emojiCompletionEnabled`), surfaces warnings when transcript writes fail (disk full, or session saving disabled by an inherited env var) instead of silently losing history, fixes a memory leak where truncated MCP tool outputs kept the full untruncated result in memory for the rest of the session, and fixes a Windows auto-update bug that could leave `claude.exe` missing after a failed update.
Why it matters
The transcript-loss warning matters most: silently losing a long session's history with no error is the kind of bug that erodes trust in the tool, and the MCP memory leak could quietly bloat memory in any session that uses MCP tools with large outputs.
How to use it
Update Claude Code to pick up the fix automatically; set `emojiCompletionEnabled` to false in settings if the autocomplete is unwanted.
Claude Code 2.1.216 Fixes Quadratic Slowdown in Long Sessions
Claude Code 2.1.216 fixes a bug where message normalization cost grew quadratically with turn count, causing multi-second stalls and slow resumes in long sessions.
Claude Code 2.1.215 makes /verify and /code-review opt-in again
Claude Code 2.1.215 stops automatically invoking the /verify and /code-review skills, requiring users to run them explicitly with the /verify or /code-review commands.
Claude Code v2.1.209: fix for blocked dialogs in background agent sessions
Claude Code 2.1.209 reverts an overly broad guard that had been blocking /model and other dialogs inside claude agents background sessions.