Claude Code v2.1.302 (Oct 16) makes fork subagents the default in claude -p, the Agent SDK, desktop and VS Code, starts permission-mode-less headless sessions on third-party providers in default mode, and adds CLAUDE_CODE_AUTO_MODE_MODEL. It also flags that standalone Claude Design (claude.ai/design) closes on Dec 14, 2026; design systems must be migrated to Claude Artifacts, while chats and comments are not carried over.

Key Takeaways

  • ✓Fork subagents now default-on in claude -p, Agent SDK, desktop and VS Code; disable with CLAUDE_CODE_FORK_SUBAGENT=0
  • ✓Headless sessions with no permission mode on third-party providers start in default mode (telemetry off or fresh install); --permission-mode auto keeps auto
  • ✓New CLAUDE_CODE_AUTO_MODE_MODEL picks the client-side auto mode classifier model; prompt/agent hooks capped at 12 concurrent per event
  • ✓Read tool refuses image sources over 128 MB; MCP servers on protocol 2026-07-28 that omit resultType/ttlMs/cacheScope no longer break
  • ✓Standalone claude.ai/design closes Dec 14, 2026; chats, comments and public links are not migrated and originals are deleted afterward
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Project Links & Resources

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Direct access to official project resources and documentation
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Claude Code v2.1.302 release notes (GitHub)
github.com/anthropics/claude-code/releases/tag/v2.1.302
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Claude Code changelog (official docs)
code.claude.com/docs/en/changelog
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Migrate from standalone Claude Design to Claude (Claude Help Center)
support.claude.com/en/articles/17440474-migrate-from-standalone-claude-design-to-claude
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Claude Design product page
claude.com/product/design
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In-Depth Technical Analysis

Claude Code v2.1.302 (released Oct 16, 2026) unifies fork subagents as the default across claude -p, the Agent SDK, the desktop app and VS Code, matching the terminal. In desktop and VS Code, subagents spawned from the main conversation always run in the background, while a subagent's own Agent calls run in the foreground by default. On third-party providers, headless sessions with no permission mode now start in default mode when telemetry is off or on a fresh install; pass --permission-mode auto to keep auto. The release adds CLAUDE_CODE_AUTO_MODE_MODEL, an Idle compaction toggle in /config, a 12-concurrent cap per hook event, a 128 MB limit on image reads, and 40+ fixes (MCP protocol 2026-07-28 tolerance, Vertex/Bedrock switching, reftable git, exFAT/FAT32 on Windows). No benchmarks were published. Separately, Anthropic's help center confirms standalone Claude Design (claude.ai/design) closes on Dec 14, 2026: Design now lives in regular Claude chats and Artifacts, design systems can be migrated from the Artifacts page, but chats, comments and public links are not carried over and originals are deleted after closure.

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