diff --git a/internal/deerflow/client.go b/internal/deerflow/client.go
index 680a827..496c25f 100644
--- a/internal/deerflow/client.go
+++ b/internal/deerflow/client.go
@@ -79,8 +79,16 @@ func (c *Client) AssertModelAvailable(model string) error {
 	return fmt.Errorf("所选模型「%s」不在可用列表中（或不可用）。请换可用模型后重新开始会商，不会自动改用其它模型", want)
 }
 
+// InitMultiAgentOpts 内网 DeerFlow 校验会商标识时需要的附加字段。
+type InitMultiAgentOpts struct {
+	DraftID       string
+	TaskID        string
+	RoomSessionID string
+}
+
 // InitMultiAgent 建多席线程，返回 agentName → threadId。
-func (c *Client) InitMultiAgent(agentNames []string, mainAgent, model string) (map[string]string, error) {
+// draft_id 在内网较新 Gateway 上是「会商标识」，缺了会 4xx。
+func (c *Client) InitMultiAgent(agentNames []string, mainAgent, model string, opts InitMultiAgentOpts) (map[string]string, error) {
 	body := map[string]interface{}{
 		"agent_names":     agentNames,
 		"main_agent_name": mainAgent,
@@ -88,6 +96,15 @@ func (c *Client) InitMultiAgent(agentNames []string, mainAgent, model string) (m
 	if m := strings.TrimSpace(model); m != "" && !strings.EqualFold(m, "demo") {
 		body["model"] = m
 	}
+	if d := strings.TrimSpace(opts.DraftID); d != "" {
+		body["draft_id"] = d
+	}
+	if t := strings.TrimSpace(opts.TaskID); t != "" {
+		body["task_id"] = t
+	}
+	if r := strings.TrimSpace(opts.RoomSessionID); r != "" {
+		body["room_session_id"] = r
+	}
 	threadIDs := map[string]string{}
 	var errMsg string
 	err := c.readSSE("/api/multi-agent/init", body, nil, func(event string, parsed map[string]interface{}) (bool, error) {
diff --git a/internal/worker/live_runner.go b/internal/worker/live_runner.go
index 6f56808..4223f3c 100644
--- a/internal/worker/live_runner.go
+++ b/internal/worker/live_runner.go
@@ -74,7 +74,25 @@ func (r *LiveChainRunner) Run(job *domain.AnalysisJob) {
 		putProgress(job, 2, "正在初始化 DeerFlow 席位线程…")
 		r.flush(job)
 		r.pullModelFromDB(job)
-		tids, err := r.DF.InitMultiAgent(agentNames, r.Coord, job.Model)
+		if strings.TrimSpace(job.DraftID) == "" {
+			r.fail(job, "缺少会商标识（draftId）。请从页面重新「开始研讨」以先落盘草稿。")
+			return
+		}
+		roomSessionID := asStr(plan["roomSessionId"])
+		if roomSessionID == "" {
+			roomSessionID = "rs_" + jobID
+			plan["roomSessionId"] = roomSessionID
+			job.Plan = plan
+		}
+		dfTaskID := strings.TrimSpace(job.DraftKey)
+		if dfTaskID == "" {
+			dfTaskID = job.TaskID
+		}
+		tids, err := r.DF.InitMultiAgent(agentNames, r.Coord, job.Model, deerflow.InitMultiAgentOpts{
+			DraftID:       job.DraftID,
+			TaskID:        dfTaskID,
+			RoomSessionID: roomSessionID,
+		})
 		if err != nil {
 			r.fail(job, err.Error())
 			return