n8n Node Configuration Each n8n node has its own parameter shape, often with conditional fields (parameter X only matters when parameter Y has value Z). Shapes evolve between versions. Guessing produces cryptic validation errors. Don't guess, use the tool. Non-negotiable Call with discriminators (resource, operation, mode) before configuring a node. Without discriminators you get the generic shape, missing operation-specific parameters and required fields. Build against the exact shape. Don't guess from memory. The live output is the canonical parameter shape. The references in this skill cov…