Claude Code v2.1.154

What's changed

• Opus 4.8 is here! Now defaults to high effort · /effort xhigh for your hardest tasks
• Introducing dynamic workflows: ask Claude to create a workflow and it orchestrates work across tens to hundreds of agents in the background, so you can take on larger, more complex tasks. Run /workflows to view your runs
• Fast mode on Opus 4.8 is now available at a fraction of its previous cost: 2x the standard rate for 2.5x the speed
• The lean system prompt is now the default for all models except Haiku, Sonnet, and Opus 4.7 and earlier
• Claude now reserves the multiple-choice question prompt for decisions it genuinely cannot make itself, instead of asking when it already has enough context to proceed
• /simplify now runs a cleanup-only review (reuse, simplification, efficiency, altitude) and applies the fixes, instead of running the full /code-review --fix bug-hunting review
• Renamed the /effort slider labels from "Speed"/"Intelligence" to "Faster"/"Smarter" for clarity
• claude agents: type ! <command> to run a shell command as a background session you can attach to and detach from. Also available as claude --bg --exec '<command>'
• claude agents: /logout now signs you out instead of being sent to a background session
• ←← to open the agents view now works on Bedrock, Vertex, Foundry, and with telemetry disabled
• Claude in Chrome: pick which connected browser to use via /chrome → "Select browser…", or in-chat when a browser action runs with multiple connected
• Plugins can now declare defaultEnabled: false in plugin.json or a marketplace entry; enable them with /plugin or claude plugin enable. Dependencies of enabled plugins are still enabled automatically
• The /plugin Discover tab now pins plugins whose relevance signals match the current directory with a "suggested for this directory" annotation
• Streaming tool execution is now always enabled, including when telemetry is disabled or on Bedrock/Vertex/Foundry (previously behind a feature flag)
• Stdio MCP server subprocesses now receive CLAUDE_CODE_SESSION_ID and CLAUDECODE=1 in their environment
• claude mcp list/get now show unapproved .mcp.json servers as ⏸ Pending approval instead of auto-approving and connecting when output is piped
• /remote-control autocomplete now shows "Disconnect Remote Control" when Remote Control is already active
• Added Claude Opus 4.8 support and 4.7 → 4.8 migration guidance to the /claude-api skill
• Deprecated CLAUDE_CODE_OPUS_4_6_FAST_MODE_OVERRIDE (will be removed on 06/01). To use fast mode on Opus 4.6, switch with /model claude-opus-4-6[1m] and then /fast on
• Improved the auto-mode classifier's detection of data exfiltration, particularly bulk transfers of repository contents
• Fixed rm -rf $HOME not being blocked as a dangerous path when HOME has a trailing slash
• Fixed $TMPDIR resolving to different directories in sandboxed vs unsandboxed Bash commands within the same session
• Fixed unreadable highlighted-row text in claude agents when the Claude Code theme doesn't match the terminal background
• Fixed background-agent completion notifications triggering premature "out of context" behavior on some 1M-context models
• Fixed background-session classifier losing the user's goal when a scheduled /command fires
• Fixed pinned background sessions respawning every minute after a Claude Code update, causing repeated agent-start notifications and process churn at idle
• Fixed background sessions stuck at "blocked", "running", or "working" not retiring after the idle grace period
• Fixed subagents in background sessions bypassing the worktree-isolation guard and writing to the shared checkout
• Fixed orphaned claude --bg-pty-host processes spinning at 100% CPU after the daemon exits on macOS
• Fixed number key shortcuts not working for options shown below the divider in option dialogs
• Fixed worktree.baseRef: "head" resolving to the main checkout's HEAD instea