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src/langbot/pkg/workflow/nodes/variable_aggregator.py

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+"""Variable Aggregator Node - aggregate variables from multiple branches
+
+Node metadata is loaded from: ../../templates/metadata/nodes/variable_aggregator.yaml
+"""
+
+from __future__ import annotations
+
+from typing import Any, ClassVar
+
+from ..entities import ExecutionContext
+from ..node import WorkflowNode, workflow_node, NodePort, NodeConfig
+
+
+@workflow_node('variable_aggregator')
+class VariableAggregatorNode(WorkflowNode):
+    """Variable aggregator node - aggregate variables from multiple branches"""
+
+    type_name = "variable_aggregator"
+    category = "control"
+    icon = "📊"
+    name = "variable_aggregator"
+    description = "variable_aggregator"
+    name_zh = "变量聚合器"
+    name_en = "Variable Aggregator"
+    description_zh = "聚合多个分支的变量输出"
+    description_en = "Aggregate variable outputs from multiple branches"
+
+    inputs: ClassVar[list[NodePort]] = []
+    outputs: ClassVar[list[NodePort]] = []
+    config_schema: ClassVar[list[NodeConfig]] = []
+
+    async def execute(self, inputs: dict[str, Any], context: ExecutionContext) -> dict[str, Any]:
+        variables = inputs.get("variables", {})
+        mode = self.get_config("aggregation_mode", "merge")
+
+        aggregated = {}
+
+        if mode == "merge":
+            if isinstance(variables, dict):
+                aggregated.update(variables)
+        elif mode == "override":
+            if isinstance(variables, dict):
+                aggregated = variables.copy()
+        elif mode == "append":
+            for key, value in (variables if isinstance(variables, dict) else {}).items():
+                if key in aggregated and isinstance(aggregated[key], list):
+                    aggregated[key].append(value)
+                else:
+                    aggregated[key] = [value]
+
+        return {"aggregated": aggregated}