fix: SynthesizeParams 加 ChannelID

backend/ai-core/internal/orchestrator/orchestrator.go

@@ -429,6 +429,7 @@ func (o *Orchestrator) ProcessInput(
 			DialogHistory: history,
 			Mode:          params.Mode,
 			ChannelType:   params.ChannelType,
+			ChannelID:    params.ChannelID,
 		}
 		if prevEnrichment != nil {
 			synthParams.MemorySummary = prevEnrichment.MemorySummary

backend/ai-core/internal/orchestrator/synthesizer.go

@@ -53,6 +53,7 @@ type SynthesizeParams struct {
 	PendingToolResults []PendingToolResult         // 上一轮异步完成的工具结果
 	Mode               string                      // text / voice_assistant
 	ChannelType        string                      // direct / group
+	ChannelID          string                      // platform channel ID
 }
 
 // Synthesize 综合所有子会话结果，流式生成最终回复。
@@ -93,6 +94,25 @@ func (s *Synthesizer) Synthesize(ctx context.Context, params SynthesizeParams, e
 				args = make(map[string]interface{})
 			}
 
+			// 自动注入当前会话的平台信息（reminder_create 需要知道来源）
+			if tc.Name == "reminder_create" && params.ChannelType != "" {
+				if _, ok := args["platform"]; !ok || args["platform"] == "" {
+					args["platform"] = "obv11"
+				}
+				if _, ok := args["channel_type"]; !ok || args["channel_type"] == "" {
+					args["channel_type"] = params.ChannelType
+				}
+				if _, ok := args["channel_id"]; !ok || args["channel_id"] == "" {
+					// Strip platform-internal prefix (private_xxx -> xxx)
+					chID := params.ChannelID
+					if strings.HasPrefix(chID, "private_") {
+						chID = chID[len("private_"):]
+					}
+					args["channel_id"] = chID
+				}
+				// adapter_name will be resolved when the reminder fires
+			}
+
 			s.emitToolProgress(eventCh, tc.Name, "started", 0, "正在执行 "+tc.Name)
 			s.emitToolProgress(eventCh, tc.Name, "started", 0, "正在执行 "+tc.Name)