diff --git a/gadget-drone/src/gadget-drone.ts b/gadget-drone/src/gadget-drone.ts
index 699efe5..33ec787 100644
--- a/gadget-drone/src/gadget-drone.ts
+++ b/gadget-drone/src/gadget-drone.ts
@@ -16,17 +16,32 @@ import PlatformService, {
 } from "./services/platform.ts";
 
 import { GadgetProcess } from "./lib/process.ts";
-import { ClientToServerEvents, ServerToClientEvents } from "@gadget/api";
+import {
+  ClientToServerEvents,
+  IChatSession,
+  IDroneRegistration,
+  IProject,
+  RequestSessionLockCallback,
+  ServerToClientEvents,
+} from "@gadget/api";
 
 interface UserCredentials {
   email: string;
   password: string;
 }
 
+enum WorkspaceMode {
+  Idle = "idle",
+  Syncing = "syncing",
+  User = "user",
+  Agent = "agent",
+}
+
 type ClientSocket = Socket<ServerToClientEvents, ClientToServerEvents>;
 
 class GadgetDrone extends GadgetProcess {
   private registration: PlatformRegistration | undefined;
+  private workspaceMode: WorkspaceMode = WorkspaceMode.Syncing;
   private socket: ClientSocket | undefined;
   private isShuttingDown: boolean = false;
 
@@ -140,9 +155,32 @@ class GadgetDrone extends GadgetProcess {
         this.log.info("connected to Gadget Code platform.");
         resolve();
       });
+
+      this.socket.on(
+        "requestSessionLock",
+        this.onRequestSessionLock.bind(this),
+      );
     });
   }
 
+  async onRequestSessionLock(
+    registration: IDroneRegistration,
+    project: IProject,
+    chatSession: IChatSession,
+    cb: RequestSessionLockCallback,
+  ) {
+    this.log.info(`requestSessionLock`, { registration, project, chatSession });
+    if (!this.registration) {
+      return cb(false, "not registered");
+    }
+    if (!registration._id.equals(this.registration._id)) {
+      return cb(false, "invalid registration");
+    }
+
+    this.workspaceMode = WorkspaceMode.User;
+    cb(true, chatSession._id.toHexString());
+  }
+
   hookProcessSignals(): void {
     process.title = this.name;
 
diff --git a/packages/api/src/messages/ide.ts b/packages/api/src/messages/ide.ts
index 0eebad7..85c9e2f 100644
--- a/packages/api/src/messages/ide.ts
+++ b/packages/api/src/messages/ide.ts
@@ -6,11 +6,16 @@ import { IChatSession } from "../interfaces/chat-session.ts";
 import { IDroneRegistration } from "../interfaces/drone-registration.ts";
 import { IProject } from "../interfaces/project.ts";
 
+export type RequestSessionLockCallback = (
+  success: boolean,
+  chatSessionId: string,
+) => void;
+
 export type RequestSessionLockMessage = (
   registration: IDroneRegistration,
   project: IProject,
   chatSession: IChatSession,
-  cb: (success: boolean, chatSessionId: string) => void,
+  cb: RequestSessionLockCallback,
 ) => void;
 
 export type SubmitPromptMessage = (prompt: string) => void;