feat: 接入新动作 update_canvas

app/processor/nodes/action_node.py

@@ -16,29 +16,38 @@ from app.schemas.actions import ActionBatch, AddAction
 
 
 def can_generate_actions(state: QueryState) -> bool:
+    return action_block_reason(state) is None
+
+
+def action_block_reason(state: QueryState) -> str | None:
+    # 路由和失败说明共用能力判断，避免支持范围不一致
     if state.get("screen_plan") is not None:
-        return plan_block_reason(state) is None
+        return plan_block_reason(state)
+
     requirement = state["requirement"]
     scope = state["change_scope"]
-    # 简单操作直接生成动作，复杂变更走规划分支
-    return (
-        requirement.intent == "modify_screen"
-        and not requirement.needs_clarification
-        and not scope.needs_planning
-        and not scope.resource_needs
-        and bool(requirement.changes)
-        and all(
+
+    if requirement.needs_clarification:
+        return "需求尚未澄清完整，不能生成动作"
+    if scope.needs_planning or requirement.intent != "modify_screen":
+        return "当前需求需要先完成规划，不能直接生成动作"
+    if scope.resource_needs:
+        return "尚未接入所需资源查询：" + "；".join(scope.resource_needs)
+    if not requirement.changes:
+        return "需求中没有可执行的变更"
+    unsupported = [
+        f"{change.target_scope}/{change.operation}"
+        for change in requirement.changes
+        if not (
             change.target_scope == "nodes"
-            and change.operation
-            in (
-                "move",
-                "resize",
-                "update",
-                "delete",
-            )
-            for change in requirement.changes
+            and change.operation in ("move", "resize", "update", "delete")
+            or change.target_scope == "canvas"
+            and change.operation in ("update", "resize", "update_canvas")
         )
-    )
+    ]
+    if unsupported:
+        return "当前尚未支持的直接操作：" + "、".join(dict.fromkeys(unsupported))
+    return None
 
 
 class ActionNode(BaseNode):
@@ -60,7 +69,7 @@ class ActionNode(BaseNode):
             return updated_state
         if not can_generate_actions(state):
             raise ValueError(
-                "ActionNode 当前只支持无需规划和资源的 move、resize、update、delete 需求"
+                "ActionNode 当前只支持无需规划和资源的 move、resize、update、delete、update_canvas 需求"
             )
         payload = {
             "input_context": state["input_context"].model_dump(mode="json"),