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When n8n connects any node to an AI Agent's tool slot, it creates a dynamic Tool variant at runtime (e.g., googleDrive → googleDriveTool). These don't exist in npm packages, causing false "unknown node type" errors. Added validation-time inference: when a *Tool node type is not found, check if the base node exists. If yes, treat as valid with warning. Changes: - workflow-validator.ts: Add INFERRED_TOOL_VARIANT logic - node-similarity-service.ts: Add 98% confidence for valid Tool variants - Added 7 unit tests for inferred tool variant functionality Fixes #522 Conceived by Romuald Członkowski - https://www.aiadvisors.pl/en 🤖 Generated with [Claude Code](https://claude.com/claude-code) Co-authored-by: Romuald Członkowski <romualdczlonkowski@MacBook-Pro-Romuald.local> Co-authored-by: Claude Opus 4.5 <noreply@anthropic.com>