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- ThinkerNode: reasons about perception, decides tool use vs direct answer - Python tool: subprocess execution with 10s timeout - Auto-detects python code blocks in LLM output and executes them - Tool call/result visible in trace + HUD - Thinker meter in frontend (token budget: 4K) - Flow: Input (perceive) -> Thinker (reason + tools) -> Output (speak) - Tested: math (42*137=5754), SQLite (create+query), time, greetings Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>