add_allowed_connection

Define an allowed connection pattern between node types for a relationship type. All three (relationship type, source node type, target node type) must already exist in the metamodel. Use get_metamodel to check existing types.

{"relationship_type": "mitigates", "source_node_type": "Feature", "target_node_type": "Risk"}

{"success": true, "operation_count": 1, "versions": [59]}