• PostToolUse hooks now replace tool output for all tools, not just MCP. If you have hooks using hookSpecificOutput.updatedToolOutput, they now fire on Read, Edit, Bash, and every other built-in tool (more below).
• New alwaysLoad MCP server config skips tool-search deferral. Set "alwaysLoad": true on any server whose tools you need available on every turn without a ToolSearch call first (more below).
• claude ultrareview runs non-interactively from CI or scripts. Prints findings to stdout (--json for structured output), exits 0 on completion or 1 on failure.
• Three memory leaks fixed: images, /usage, and stalled tool progress could each grow sessions past 2 GB. If long sessions have felt sluggish or your machine started swapping, update.
• MCP servers auto-retry up to 3 times on transient startup errors. Servers that previously stayed disconnected after a flaky first connection now recover silently.

New in 2.1.121, 2.1.120

2.1.121 (April 28, 2026)

• Added alwaysLoad option to MCP server config; when true, all tools from that server skip tool-search deferral and are always available
• Added claude plugin prune to remove orphaned auto-installed plugin dependencies; plugin uninstall --prune cascades
• Added a type-to-filter search box to /skills so you can find a skill in long lists without scrolling
• PostToolUse hooks can now replace tool output for all tools via hookSpecificOutput.updatedToolOutput (previously MCP-only)
• Fullscreen mode: typing into the prompt no longer jumps scroll back to the bottom after you've scrolled up to read earlier output
• Dialogs that overflow the terminal are now scrollable with arrow keys, PgUp/PgDn, home/end, and mouse wheel in both fullscreen and non-fullscreen modes
• Clicking any line of a long URL that wraps across rows in fullscreen mode now opens the full URL
• SDK and claude -p: CLAUDE_CODE_FORK_SUBAGENT=1 now works in non-interactive sessions
• --dangerously-skip-permissions no longer prompts for writes to .claude/skills/, .claude/agents/, and .claude/commands/
• /terminal-setup now enables iTerm2's "Applications in terminal may access clipboard" setting so /copy works, including from tmux
• MCP servers that hit a transient error during startup now auto-retry up to 3 times instead of staying disconnected
• The terminal tab session title is now generated in your configured language setting
• Claude.ai connectors with the same upstream URL are now deduplicated instead of appearing as duplicates
• Vertex AI: support X.509 certificate-based Workload Identity Federation (mTLS ADC)
• Faster startup after upgrading: removed the Recent Activity panel from the release-notes splash
• LSP diagnostic summaries now expand on click/ctrl+o and show the expand hint
• SDK: mcp_authenticate now supports redirectUri for custom scheme completion and claude.ai connectors
• OpenTelemetry: added stop_reason, gen_ai.response.finish_reasons, and user_system_prompt (gated behind OTEL_LOG_USER_PROMPTS) to LLM request spans
• [VSCode] Voice dictation now respects the accessibility.voice.speechLanguage setting when no Claude Code language is configured
• [VSCode] /context now opens a native token usage dialog
• Fixed unbounded memory growth (multi-GB RSS) when processing many images in a session
• Fixed /usage leaking up to ~2GB of memory on machines with large transcript histories
• Fixed memory leak when long-running tools fail to emit a clear progress event
• Fixed Bash tool becoming permanently unusable when the directory Claude was started in is deleted or moved mid-session
• Fixed --resume crashing on startup in external builds
• Fixed --resume failing on large sessions when a transcript line was corrupted by an unclean shutdown; the corrupt line is now skipped
• Fixed thinking.type.enabled is not supported error when using Bedrock application inference profile ARNs
• Fixed Microsoft 365 MCP OAuth failing with duplicate or unsupported prompt parameter
• Fixed scrollback duplication when pressing Ctrl+L or triggering a redraw in non-fullscreen mode on tmux, GNOME Terminal, Windows Terminal, and Konsole
• Fixed claude.ai MCP connectors silently disappearing when the connector-list fetch hits a transient auth error at startup
• Fixed "Always allow" rules for built-in tools in remote sessions not surviving worker restarts
• Fixed NO_PROXY not being respected for all HTTP clients when set via managed-settings.json under the native build
• Fixed managed settings approval prompt exiting the session even when accepted; now applies settings and continues
• Fixed /usage returning "rate limited" after a stale OAuth token; now refreshes automatically
• Fixed invalid legacy enum values in settings.json invalidating the entire settings file
• Fixed /usage dialog content being clipped when no-flicker mode is off
• Fixed /focus showing "Unknown command" when the fullscreen renderer is off; now explains how to enable it
• Fixed embedded grep/find/rg shell wrappers failing when the running binary is deleted mid-session; now falls back to installed tools
• Reduced peak file descriptor usage during find in the Bash tool on large directory trees

2.1.120 (April 28, 2026)

• Windows: Git for Windows (Git Bash) is no longer required; when absent, Claude Code uses PowerShell as the shell tool
• Added claude ultrareview [target] subcommand to run /ultrareview non-interactively from CI or scripts; prints findings to stdout (--json for raw output) and exits 0 on completion or 1 on failure
• Skills can now reference the current effort level with ${CLAUDE_EFFORT} in their content
• Set AI_AGENT environment variable for subprocesses so gh can attribute traffic to Claude Code
• Spinner tips that recommend installing the desktop app or creating skills/agents are now hidden when you already have them
• Show a "use PgUp/PgDn to scroll" hint when the terminal sends arrow keys instead of scroll events
• Faster session start when you have many claude.ai connectors configured but not authorized
• The auto mode denial message now links to the configuration docs
• claude plugin validate now accepts $schema, version, and description at the top level of marketplace.json and $schema in plugin.json
• Auto-compact in auto mode now displays auto (lowercase, no token count) instead of a misleading token value
• Fixed pressing Esc during a stdio MCP tool call closing the entire server connection (regression in 2.1.105)
• Fixed /rewind and other interactive overlays not responding to keyboard input after launching with claude --resume
• Fixed terminal scrollback duplication in non-fullscreen mode (resize, dialog dismiss, long sessions)
• Fixed DISABLE_TELEMETRY / CLAUDE_CODE_DISABLE_NONESSENTIAL_TRAFFIC not suppressing usage metrics telemetry for API and enterprise users
• Fixed false-positive "Dangerous rm operation" permission prompts in auto mode for multi-line bash commands containing both a pipe and a redirect
• Fixed long selection menus clipping below the terminal in fullscreen mode; the focused option now stays on screen as you scroll
• Fixed Write tool output collapsing instead of expanding when clicking "+N lines" in fullscreen
• Fixed slash command picker jumping while typing, and improved highlight to only match contiguous substrings in blue
• Fixed /plugin marketplace failing to load when one entry uses an unrecognized source format; that entry is shown but installing it prompts you to update
• [VSCode] /usage now opens the native Account & Usage dialog instead of returning plain-text session cost
• [VSCode] Voice dictation now respects the language setting in ~/.claude/settings.json
• Fixed find in the Bash tool exhausting open file descriptors on large directory trees, causing host-wide crashes (macOS/Linux native builds)

Notes