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Show HN: `npx subagent-reuse --setup` adds an MCP that scans ~/.claude/projects/, builds SHA-256 Merkle trees of files each subagent already read/modified, and route_task decides REUSE vs CREATE_NEW before spawn—structural overlap only, no embeddings; ~1k LOC JS + 52 tests.
Anthropic Claude Code v2.1.302 (Oct 16 changelog): fork subagents (`subagent_type: "fork"`) are now default in `claude -p`, the Agent SDK, desktop app, and VS Code (already default in the terminal). Disable with CLAUDE_CODE_FORK_SUBAGENT=0; `claude mcp serve` never offers forks. Also: CLAUDE_CODE_AUTO_MODE_MODEL for the client-side auto-mode classifier, /config idle-compaction toggle, and notice that standalone Claude Design shuts down Dec 14, 2026. Desktop/VS Code main-conversation subagents always run in the background.