fix(plugin): default value for tool execution response parameter type (#683)

Co-authored-by: mrh <mrh997>

backend/domain/agent/singleagent/internal/agentflow/node_tool_plugin.go

@@ -121,6 +121,7 @@ func (p *pluginInvokableTool) InvokableRun(ctx context.Context, argumentsInJSON
 	}
 
 	opts := []pluginEntity.ExecuteToolOpt{
+		plugin.WithInvalidRespProcessStrategy(plugin.InvalidResponseProcessStrategyOfReturnDefault),
 		plugin.WithToolVersion(p.toolInfo.GetVersion()),
 		plugin.WithProjectInfo(p.projectInfo),
 	}

backend/domain/agent/singleagent/internal/agentflow/node_tool_pre_retriever.go

@@ -69,6 +69,7 @@ func (pr *toolPreCallConf) toolPreRetrieve(ctx context.Context, ar *AgentRequest
 			}
 
 			opts := []pluginEntity.ExecuteToolOpt{
+				plugin.WithInvalidRespProcessStrategy(plugin.InvalidResponseProcessStrategyOfReturnDefault),
 				plugin.WithProjectInfo(&plugin.ProjectInfo{
 					ProjectID:      ar.Identity.AgentID,
 					ProjectType:    plugin.ProjectTypeOfAgent,