Claude Code 2.1.117: Subagents, MCP Fixes, Opus 4.7 Context

TL;DR

• Forked subagents now work on external builds with a single env var
• MCP servers load properly for agent sessions; plugin marketplace enforcement tightened
• Fixed Opus 4.7 context window miscalculation causing premature autocompact
• OAuth token refresh, WebFetch hangs, and idle re-render loop all patched

New

• Forked subagents on external builds — set CLAUDE_CODE_FORK_SUBAGENT=1 to enable subagent forking outside the main Claude Code environment
• Agent frontmatter MCP loading — mcpServers in agent frontmatter now load for main-thread sessions via --agent
• Model selection persistence — /model selections now stick across restarts even when your project pins a different model; startup header shows the source
• /resume summarization — large, stale sessions now get a summary offer before re-reading, matching --resume behavior
• Concurrent MCP connects — faster startup when both local and claude.ai MCP servers are configured
• Plugin dependency auto-install — plugin install on already-installed plugins now installs missing dependencies instead of stopping
• Marketplace enforcement — blockedMarketplaces and strictKnownMarketplaces now enforced on install, update, refresh, and autoupdate
• Advisor Tool improvements — experimental label, learn-more link, startup notification; fixed "result content could not be processed" errors
• Retention sweep expansion — cleanupPeriodDays now covers ~/.claude/tasks/, ~/.claude/shell-snapshots/, and ~/.claude/backups/
• OpenTelemetry enhancements — user_prompt events include command_name and command_source; cost/token/API events include effort attribute when supported
• Native search tools — macOS and Linux now use embedded bfs and ugrep via Bash tool instead of separate Glob/Grep tools (faster, no extra round-trip)
• Windows subprocess optimization — cached where.exe lookups per process for faster launches
• Pro/Max effort default — Opus 4.6 and Sonnet 4.6 now default to high effort instead of medium

Fixed

• Plain-CLI OAuth sessions no longer die with "Please run /login" when access token expires mid-session — token now refreshes reactively on 401
• WebFetch hanging on very large HTML pages — input now truncated before HTML-to-markdown conversion
• Proxy returning HTTP 204 No Content now surfaces a clear error instead of crashing with TypeError
• /login now works when launched with CLAUDE_CODE_OAUTH_TOKEN env var and that token expires
• Prompt-input undo (Ctrl+_) no longer does nothing immediately after typing and skips states correctly
• NO_PROXY now respected for remote API requests when running under Bun
• Rare spurious escape/return triggers on slow connections fixed
• SDK reload_plugins no longer reconnects all user MCP servers serially
• Bedrock application-inference-profile requests with Opus 4.7 (thinking disabled) no longer fail with 400
• MCP elicitation/create requests no longer auto-cancel in print/SDK mode when server finishes connecting mid-turn
• Subagents running a different model no longer incorrectly flag file reads with malware warning
• Idle re-render loop with background tasks fixed, reducing memory growth on Linux
• VSCode "Manage Plugins" panel no longer breaks with multiple large marketplaces configured
• Opus 4.7 context window fix — sessions no longer show inflated /context percentages or autocompact early; Claude Code now correctly uses Opus 4.7's native 1M window instead of 200K

Update: npm install -g @anthropic-ai/claude-code@latest

Source: Claude Code