diff --git a/packages/sdk/index.html b/packages/sdk/index.html
index dcc9b62..c17d138 100644
--- a/packages/sdk/index.html
+++ b/packages/sdk/index.html
@@ -273,6 +273,7 @@ <h3>Prompt Control</h3>
         </div>
         <div class="inline-controls">
             <button id="send-prompt" disabled>Send Prompt</button>
+            <button id="reset-input" disabled>Reset Input</button>
             <div class="checkbox-group">
                 <input type="checkbox" id="enrich-toggle" checked>
                 <label for="enrich-toggle" style="margin: 0; font-weight: normal;">Enrich Prompt</label>
@@ -386,6 +387,7 @@ <h3>Console Logs</h3>
             remoteVideo: document.getElementById('remote-video'),
             promptInput: document.getElementById('prompt-input'),
             sendPrompt: document.getElementById('send-prompt'),
+            resetInput: document.getElementById('reset-input'),
             enrichToggle: document.getElementById('enrich-toggle'),
             // Promise-based prompt elements
             promisePromptInput: document.getElementById('promise-prompt-input'),
@@ -546,6 +548,7 @@ <h3>Console Logs</h3>
                     elements.disconnectBtn.disabled = false;
                     elements.promptInput.disabled = false;
                     elements.sendPrompt.disabled = false;
+                    elements.resetInput.disabled = false;
                     elements.promisePromptInput.disabled = false;
                     elements.sendPromisePrompt.disabled = false;
                     elements.referenceImage.disabled = false;
@@ -599,6 +602,7 @@ <h3>Console Logs</h3>
             elements.disconnectBtn.disabled = true;
             elements.promptInput.disabled = true;
             elements.sendPrompt.disabled = true;
+            elements.resetInput.disabled = true;
             elements.promptInput.value = '';
             elements.promisePromptInput.disabled = true;
             elements.sendPromisePrompt.disabled = true;
@@ -641,6 +645,25 @@ <h3>Console Logs</h3>
         // Send prompt on button click
         elements.sendPrompt.addEventListener('click', sendPrompt);
         
+        // Reset input (back to passthrough)
+        elements.resetInput.addEventListener('click', async () => {
+            if (!decartRealtime || !isConnected) {
+                addLog('Not connected to Decart', 'error');
+                return;
+            }
+            try {
+                elements.resetInput.disabled = true;
+                addLog('Resetting input to passthrough...', 'info');
+                await decartRealtime.resetInput();
+                addLog('Reset to passthrough mode', 'success');
+                elements.promptInput.value = '';
+            } catch (error) {
+                addLog(`Failed to reset input: ${error.message}`, 'error');
+            } finally {
+                elements.resetInput.disabled = false;
+            }
+        });
+
         // Send prompt on Enter key
         elements.promptInput.addEventListener('keypress', (e) => {
             if (e.key === 'Enter' && !elements.sendPrompt.disabled) {
diff --git a/packages/sdk/src/realtime/client.ts b/packages/sdk/src/realtime/client.ts
index f1869b0..f31f6e8 100644
--- a/packages/sdk/src/realtime/client.ts
+++ b/packages/sdk/src/realtime/client.ts
@@ -109,6 +109,7 @@ export type Events = {
 export type RealTimeClient = {
   set: (input: SetInput) => Promise<void>;
   setPrompt: (prompt: string, { enhance }?: { enhance?: boolean }) => Promise<void>;
+  resetInput: () => Promise<void>;
   isConnected: () => boolean;
   getConnectionState: () => ConnectionState;
   disconnect: () => void;
@@ -118,7 +119,7 @@ export type RealTimeClient = {
   subscribeToken: string | null;
   setImage: (
     image: Blob | File | string | null,
-    options?: { prompt?: string; enhance?: boolean; timeout?: number },
+    options?: { prompt?: string | null; enhance?: boolean; timeout?: number },
   ) => Promise<void>;
   playAudio?: (audio: Blob | File | ArrayBuffer) => Promise<void>;
 };
@@ -329,6 +330,7 @@ export const createRealTimeClient = (opts: RealTimeClientOptions) => {
       const client: RealTimeClient = {
         set: methods.set,
         setPrompt: methods.setPrompt,
+        resetInput: methods.resetInput,
         isConnected: () => manager.isConnected(),
         getConnectionState: () => manager.getConnectionState(),
         disconnect: () => {
@@ -348,7 +350,7 @@ export const createRealTimeClient = (opts: RealTimeClientOptions) => {
         },
         setImage: async (
           image: Blob | File | string | null,
-          options?: { prompt?: string; enhance?: boolean; timeout?: number },
+          options?: { prompt?: string | null; enhance?: boolean; timeout?: number },
         ) => {
           if (image === null) {
             return manager.setImage(null, options);
diff --git a/packages/sdk/src/realtime/methods.ts b/packages/sdk/src/realtime/methods.ts
index 6755d41..39b6cde 100644
--- a/packages/sdk/src/realtime/methods.ts
+++ b/packages/sdk/src/realtime/methods.ts
@@ -7,7 +7,7 @@ const UPDATE_TIMEOUT_MS = 30 * 1000;
 
 const setInputSchema = z
   .object({
-    prompt: z.string().min(1).optional(),
+    prompt: z.union([z.string().min(1), z.null()]).optional(),
     enhance: z.boolean().optional().default(true),
     image: z.union([z.instanceof(Blob), z.instanceof(File), z.string(), z.null()]).optional(),
   })
@@ -109,8 +109,14 @@ export const realtimeMethods = (
     }
   };
 
+  const resetInput = async (): Promise<void> => {
+    assertConnected();
+    await webrtcManager.setImage(null, { prompt: null, timeout: UPDATE_TIMEOUT_MS });
+  };
+
   return {
     set,
     setPrompt,
+    resetInput,
   };
 };
diff --git a/packages/sdk/src/realtime/webrtc-manager.ts b/packages/sdk/src/realtime/webrtc-manager.ts
index 71408fb..1efca07 100644
--- a/packages/sdk/src/realtime/webrtc-manager.ts
+++ b/packages/sdk/src/realtime/webrtc-manager.ts
@@ -246,7 +246,7 @@ export class WebRTCManager {
 
   setImage(
     imageBase64: string | null,
-    options?: { prompt?: string; enhance?: boolean; timeout?: number },
+    options?: { prompt?: string | null; enhance?: boolean; timeout?: number },
   ): Promise<void> {
     return this.connection.setImageBase64(imageBase64, options);
   }
diff --git a/packages/sdk/tests/unit.test.ts b/packages/sdk/tests/unit.test.ts
index 627303e..aca56aa 100644
--- a/packages/sdk/tests/unit.test.ts
+++ b/packages/sdk/tests/unit.test.ts
@@ -1422,6 +1422,28 @@ describe("set()", () => {
       timeout: 30000,
     });
   });
+
+  it("set({ prompt: null }) resets to passthrough", async () => {
+    await methods.set({ prompt: null });
+    expect(mockManager.setImage).toHaveBeenCalledWith(null, {
+      prompt: null,
+      enhance: true,
+      timeout: 30000,
+    });
+  });
+
+  it("resetInput sends passthrough signal", async () => {
+    await methods.resetInput();
+    expect(mockManager.setImage).toHaveBeenCalledWith(null, {
+      prompt: null,
+      timeout: 30000,
+    });
+  });
+
+  it("resetInput rejects when not connected", async () => {
+    mockManager.getConnectionState.mockReturnValue("disconnected");
+    await expect(methods.resetInput()).rejects.toThrow("Cannot send message: connection is disconnected");
+  });
 });
 
 describe("Subscribe Token", () => {