refactor(agent): remove legacy image mode prompt injection

webui/src/hooks/useNanobotStream.ts

@@ -13,7 +13,6 @@ import type { StreamError } from "@/lib/nanobot-client";
 import type {
   InboundEvent,
   OutboundCliAppMention,
-  OutboundImageGeneration,
   OutboundMcpPresetMention,
   OutboundMedia,
   GoalStateWsPayload,
@@ -477,7 +476,6 @@ export interface SendImage {
 }
 
 export interface SendOptions {
-  imageGeneration?: OutboundImageGeneration;
   cliApps?: OutboundCliAppMention[];
   mcpPresets?: OutboundMcpPresetMention[];
   workspaceScope?: WorkspaceScopePayload | null;

webui/src/lib/nanobot-client.ts

@@ -3,7 +3,6 @@ import type {
   InboundEvent,
   Outbound,
   OutboundCliAppMention,
-  OutboundImageGeneration,
   OutboundMcpPresetMention,
   OutboundMedia,
   GoalStateWsPayload,
@@ -385,7 +384,6 @@ export class NanobotClient {
     content: string,
     media?: OutboundMedia[],
     options?: {
-      imageGeneration?: OutboundImageGeneration;
       cliApps?: OutboundCliAppMention[];
       mcpPresets?: OutboundMcpPresetMention[];
       workspaceScope?: WorkspaceScopePayload | null;
@@ -398,7 +396,6 @@ export class NanobotClient {
       chat_id: chatId,
       content,
       ...(media && media.length > 0 ? { media } : {}),
-      ...(options?.imageGeneration ? { image_generation: options.imageGeneration } : {}),
       ...(options?.cliApps?.length ? { cli_apps: options.cliApps } : {}),
       ...(options?.mcpPresets?.length ? { mcp_presets: options.mcpPresets } : {}),
       ...(options?.workspaceScope ? { workspace_scope: options.workspaceScope } : {}),

webui/src/lib/types.ts

@@ -932,11 +932,6 @@ export interface OutboundMedia {
   name?: string;
 }
 
-export interface OutboundImageGeneration {
-  enabled: true;
-  aspect_ratio?: string | null;
-}
-
 export interface OutboundCliAppMention {
   name: string;
   display_name?: string;
@@ -998,7 +993,6 @@ export type Outbound =
       chat_id: string;
       content: string;
       media?: OutboundMedia[];
-      image_generation?: OutboundImageGeneration;
       cli_apps?: OutboundCliAppMention[];
       mcp_presets?: OutboundMcpPresetMention[];
       workspace_scope?: WorkspaceScopePayload;

webui/src/tests/nanobot-client.test.ts

@@ -528,33 +528,6 @@ describe("NanobotClient", () => {
     });
   });
 
-  it("includes image generation options in outbound messages", () => {
-    const client = new NanobotClient({
-      url: "ws://test",
-      reconnect: false,
-      socketFactory: (url) => new FakeSocket(url) as unknown as WebSocket,
-    });
-    client.connect();
-    lastSocket().fakeOpen();
-
-    client.sendMessage(
-      "chat-img",
-      "draw a banner",
-      undefined,
-      { imageGeneration: { enabled: true, aspect_ratio: "16:9" } },
-    );
-
-    expect(lastSocket().sent).toContain(
-      JSON.stringify({
-        type: "message",
-        chat_id: "chat-img",
-        content: "draw a banner",
-        image_generation: { enabled: true, aspect_ratio: "16:9" },
-        webui: true,
-      }),
-    );
-  });
-
   it("includes CLI app attachments in outbound messages", () => {
     const client = new NanobotClient({
       url: "ws://test",

webui/src/tests/useNanobotStream.test.tsx

@@ -1640,31 +1640,6 @@ describe("useNanobotStream", () => {
     expect(result.current.messages[0].media).toHaveLength(1);
   });
 
-  it("passes image generation options to the websocket client", () => {
-    const fake = fakeClient();
-    const { result } = renderHook(() => useNanobotStream("chat-img", EMPTY_MESSAGES), {
-      wrapper: wrap(fake.client),
-    });
-
-    act(() => {
-      result.current.send(
-        "draw a square icon",
-        undefined,
-        { imageGeneration: { enabled: true, aspect_ratio: "1:1" } },
-      );
-    });
-
-    expect(fake.client.sendMessage).toHaveBeenCalledWith(
-      "chat-img",
-      "draw a square icon",
-      undefined,
-      expect.objectContaining({
-        imageGeneration: { enabled: true, aspect_ratio: "1:1" },
-        turnId: expect.any(String),
-      }),
-    );
-  });
-
   it("stops the active turn without adding a user slash command bubble", () => {
     const fake = fakeClient();
     const { result } = renderHook(() => useNanobotStream("chat-stop", EMPTY_MESSAGES), {