diff --git a/hub/src/feishu/trigger.ts b/hub/src/feishu/trigger.ts
index cb8bcbd..0ca7cf5 100644
--- a/hub/src/feishu/trigger.ts
+++ b/hub/src/feishu/trigger.ts
@@ -187,6 +187,7 @@ export function makeTriggerHandler(deps: TriggerDeps): TriggerHandler {
       projectId,
       workspaceDir: project.workspaceDir,
       rt,
+      senderOpenId,
     });
     const promptForAgent = withFeishuTriggerContext(agentPrompt, feishuTriggerContext);
 
@@ -241,7 +242,7 @@ export function makeTriggerHandler(deps: TriggerDeps): TriggerHandler {
         model,
         prompt: agentPrompt.slice(0, 200),
         sender: await senderAuditMetadata(rt, senderOpenId),
-        ...(feishuTriggerContext === null ? {} : { feishuTriggerContext }),
+        feishuTriggerContext,
       },
     });
 
@@ -836,18 +837,18 @@ interface BuildFeishuTriggerContextArgs {
   readonly projectId: string;
   readonly workspaceDir: string;
   readonly rt: FeishuRuntime;
+  readonly senderOpenId: string;
 }
 
-async function buildFeishuTriggerContext(args: BuildFeishuTriggerContextArgs): Promise<Prisma.InputJsonObject | null> {
+async function buildFeishuTriggerContext(args: BuildFeishuTriggerContextArgs): Promise<Prisma.InputJsonObject> {
   const replyToMessageId = nonEmpty(args.msg.parent_id);
   const rootId = nonEmpty(args.msg.root_id);
   const threadId = nonEmpty(args.msg.thread_id);
-  if (replyToMessageId === undefined && rootId === undefined && threadId === undefined) {
-    return null;
-  }
 
   const context: Record<string, Prisma.InputJsonValue> = {
     trigger_message_id: args.msg.message_id,
+    chat_id: args.chatId,
+    sender: await senderAuditMetadata(args.rt, args.senderOpenId),
   };
   if (replyToMessageId !== undefined) context["reply_to_message_id"] = replyToMessageId;
   if (rootId !== undefined) context["root_id"] = rootId;
@@ -878,24 +879,29 @@ function parseJsonForMetadata(text: string): Prisma.InputJsonValue {
   }
 }
 
-function withFeishuTriggerContext(prompt: string, context: Prisma.InputJsonObject | null): string {
-  if (context === null) return prompt;
-  return `Feishu trigger context:\n${JSON.stringify(context, null, 2)}\n\nUser request:\n${prompt}`;
+function withFeishuTriggerContext(prompt: string, context: Prisma.InputJsonObject): string {
+  return `Feishu trigger context:\n${JSON.stringify(context, null, 2)}\n\nUser request from ${senderLabelFromContext(context)}:\n${prompt}`;
 }
 
 function agentRunMetadata(
   roleId: string,
   rawPrompt: string,
-  feishuTriggerContext: Prisma.InputJsonObject | null,
+  feishuTriggerContext: Prisma.InputJsonObject,
 ): Prisma.InputJsonObject {
-  const metadata: Record<string, Prisma.InputJsonValue> = { roleId };
-  if (feishuTriggerContext !== null) {
-    metadata["rawPrompt"] = rawPrompt;
-    metadata["feishuTriggerContext"] = feishuTriggerContext;
-  }
+  const metadata: Record<string, Prisma.InputJsonValue> = { roleId, rawPrompt, feishuTriggerContext };
   return metadata as Prisma.InputJsonObject;
 }
 
+function senderLabelFromContext(context: Prisma.InputJsonObject): string {
+  const sender = context["sender"];
+  if (typeof sender !== "object" || sender === null || Array.isArray(sender)) return "unknown sender";
+  const senderObject = sender as Record<string, unknown>;
+  const name = senderObject["name"];
+  if (typeof name === "string" && name.trim() !== "") return name.trim();
+  const openId = senderObject["open_id"];
+  return typeof openId === "string" && openId.trim() !== "" ? openId.trim() : "unknown sender";
+}
+
 function auditDecision(decision: AuthorizationDecision): Record<string, unknown> {
   return {
     allowed: decision.allowed,
diff --git a/hub/test/integration/trigger.test.ts b/hub/test/integration/trigger.test.ts
index 585fd0a..df6bd1b 100644
--- a/hub/test/integration/trigger.test.ts
+++ b/hub/test/integration/trigger.test.ts
@@ -50,6 +50,12 @@ function makeEvent(chatId: string, text: string, senderOpenId = "ou_test_user",
   };
 }
 
+function expectPromptFromSender(prompt: string | undefined, senderOpenId: string, rawPrompt: string): void {
+  expect(prompt).toContain("Feishu trigger context");
+  expect(prompt).toContain(`"open_id": "${senderOpenId}"`);
+  expect(prompt).toContain(`User request from ${senderOpenId}:\n${rawPrompt}`);
+}
+
 function createMockRunAgent(calls: RunRequest[] = []): TestRunner {
   return async (req) => {
     calls.push(req);
@@ -145,10 +151,42 @@ describe("trigger full lifecycle (integration)", () => {
       const runs = await prisma.agentRun.findMany();
       expect(runs).toHaveLength(1);
       expect(runs[0]?.status).toBe("COMPLETED");
-      expect(runs[0]?.prompt).toBe("第一段\n第二段");
+      expectPromptFromSender(runs[0]?.prompt, "ou_test_user", "第一段\n第二段");
     });
     expect(runAgentCalls).toHaveLength(1);
-    expect(runAgentCalls[0]?.prompt).toBe("第一段\n第二段");
+    expectPromptFromSender(runAgentCalls[0]?.prompt, "ou_test_user", "第一段\n第二段");
+  });
+
+  it("keeps the project session shared while labeling each sender in the prompt", async () => {
+    await seedProject("proj-speaker", "chat-speaker");
+    await prisma.permissionGrant.create({
+      data: {
+        resourceType: "PROJECT",
+        resourceId: "proj-speaker",
+        principalType: "FEISHU_CHAT",
+        principalId: "chat-speaker",
+        role: "EDIT",
+      },
+    });
+    const trigger = makeTriggerHandler({ prisma, settings, logger: silentLogger, runAgent, messageBatcherOptions: { maxMessages: 1 } });
+
+    await trigger(makeEvent("chat-speaker", "@_user_1 Alice 的需求", "ou_alice"), rt);
+    await vi.waitFor(() => {
+      expect(runAgentCalls).toHaveLength(1);
+    });
+    await vi.waitFor(async () => {
+      expect(await prisma.projectAgentLock.findMany()).toHaveLength(0);
+    });
+
+    await trigger(makeEvent("chat-speaker", "@_user_1 Bob 的需求", "ou_bob"), rt);
+    await vi.waitFor(() => {
+      expect(runAgentCalls).toHaveLength(2);
+    });
+
+    expectPromptFromSender(runAgentCalls[0]?.prompt, "ou_alice", "Alice 的需求");
+    expectPromptFromSender(runAgentCalls[1]?.prompt, "ou_bob", "Bob 的需求");
+    const sessions = await prisma.agentSession.findMany();
+    expect(sessions).toHaveLength(1);
   });
 
   it("/new bypasses message batching", async () => {
@@ -351,7 +389,7 @@ describe("trigger full lifecycle (integration)", () => {
     await vi.waitFor(() => {
       expect(runAgentCalls).toHaveLength(2);
     });
-    expect(runAgentCalls[1]?.prompt).toBe("第二个请求");
+    expectPromptFromSender(runAgentCalls[1]?.prompt, "ou_test_user", "第二个请求");
 
     secondRun.resolve(completedRunResult("second done", "sdk-session-second"));
     await vi.waitFor(async () => {
@@ -485,7 +523,7 @@ describe("trigger full lifecycle (integration)", () => {
     await vi.waitFor(async () => {
       const runs = await prisma.agentRun.findMany();
       expect(runs).toHaveLength(1);
-      expect(runs[0]?.prompt).toBe("/unknown");
+      expectPromptFromSender(runs[0]?.prompt, "ou_test_user", "/unknown");
     });
   });
 
@@ -531,7 +569,7 @@ describe("trigger full lifecycle (integration)", () => {
     await vi.waitFor(async () => {
       const runs = await prisma.agentRun.findMany();
       expect(runs).toHaveLength(1);
-      expect(runs[0]?.prompt).toBe("写第三单元");
+      expectPromptFromSender(runs[0]?.prompt, "ou_test_user", "写第三单元");
       expect(runs[0]?.metadata).toMatchObject({ roleId: "draft" });
     });
   });
@@ -651,7 +689,7 @@ describe("trigger full lifecycle (integration)", () => {
     expect(prompt).toContain("m-parent");
     expect(prompt).toContain("thread-1");
     expect(prompt).toContain("上一条需求");
-    expect(prompt).toContain("User request:\n继续这个改法");
+    expectPromptFromSender(prompt, "ou_test_user", "继续这个改法");
 
     const run = await prisma.agentRun.findFirst();
     expect(run?.prompt).toBe(prompt);
@@ -660,6 +698,8 @@ describe("trigger full lifecycle (integration)", () => {
       rawPrompt: "继续这个改法",
       feishuTriggerContext: {
         trigger_message_id: "m-child",
+        chat_id: "chat-13c",
+        sender: { open_id: "ou_test_user" },
         reply_to_message_id: "m-parent",
         root_id: "m-root",
         thread_id: "thread-1",