diff --git a/packages/server/src/server/agent/providers/pi/agent.test.ts b/packages/server/src/server/agent/providers/pi/agent.test.ts
index 76589743d..5b4eb5838 100644
--- a/packages/server/src/server/agent/providers/pi/agent.test.ts
+++ b/packages/server/src/server/agent/providers/pi/agent.test.ts
@@ -97,6 +97,18 @@ class SessionEvents {
       .map((event) => event.item);
   }
 
+  timelineAndCompletionEvents() {
+    return this.events.flatMap((event) => {
+      if (event.type === "timeline") {
+        return [{ type: "timeline" as const, item: event.item }];
+      }
+      if (event.type === "turn_completed") {
+        return [{ type: "turn_completed" as const }];
+      }
+      return [];
+    });
+  }
+
   nextTurnCompletion(): Promise<Extract<AgentStreamEvent, { type: "turn_completed" }>> {
     return this.nextEvent(
       (event): event is Extract<AgentStreamEvent, { type: "turn_completed" }> =>
@@ -459,6 +471,28 @@ describe("PiRpcAgentSession", () => {
     ]);
   });
 
+  test("surfaces Pi extension command messages and completes when no agent turn starts", async () => {
+    const { pi, session, events } = await createSession();
+    const fakeSession = pi.latestSession();
+
+    await session.startTurn("/show-status");
+    fakeSession.emit({
+      type: "message_end",
+      message: {
+        role: "custom",
+        content: [{ type: "text", text: "Extension command output" }],
+      },
+    });
+
+    expect(events.timelineAndCompletionEvents()).toEqual([
+      {
+        type: "timeline",
+        item: { type: "assistant_message", text: "Extension command output" },
+      },
+      { type: "turn_completed" },
+    ]);
+  });
+
   test("adds Pi assistant context to generic provider finish errors", async () => {
     const { pi, session, events } = await createSession();
 
diff --git a/packages/server/src/server/agent/providers/pi/agent.ts b/packages/server/src/server/agent/providers/pi/agent.ts
index eb0e1de5e..b76ab5c7b 100644
--- a/packages/server/src/server/agent/providers/pi/agent.ts
+++ b/packages/server/src/server/agent/providers/pi/agent.ts
@@ -1499,6 +1499,20 @@ export class PiRpcAgentSession implements AgentSession {
     event: Extract<PiAgentSessionEvent, { type: "message_end" }>,
     turnId: string | undefined,
   ): void {
+    if (event.message.role === "custom") {
+      const text = getUserMessageText(event.message.content);
+      if (text) {
+        this.emit({
+          type: "timeline",
+          provider: PI_PROVIDER,
+          turnId,
+          item: { type: "assistant_message", text },
+        });
+      }
+      this.completeTurn(turnId, []);
+      return;
+    }
+
     if (event.message.role !== "user") {
       return;
     }
diff --git a/packages/server/src/server/agent/providers/pi/rpc-types.ts b/packages/server/src/server/agent/providers/pi/rpc-types.ts
index aab5f9424..90f9aa4e1 100644
--- a/packages/server/src/server/agent/providers/pi/rpc-types.ts
+++ b/packages/server/src/server/agent/providers/pi/rpc-types.ts
@@ -30,6 +30,10 @@ export type PiAgentMessage =
       role: "user";
       content: string | Array<PiTextContent | PiImageContent>;
     }
+  | {
+      role: "custom";
+      content: string | Array<PiTextContent | PiImageContent>;
+    }
   | {
       role: "assistant";
       content: PiAssistantContent[];