CopilotKit · MikeRyanDev · Oct 20, 2025
diff --git a/apps/angular/demo-server/package.json b/apps/angular/demo-server/package.json
@@ -8,7 +8,7 @@
     "start": "node --env-file=.env --loader tsx src/index.ts"
   },
   "dependencies": {
-    "@ag-ui/client": "0.0.40-alpha.6",
+    "@ag-ui/client": "0.0.40-alpha.7",
     "@ag-ui/langgraph": "^0.0.11",
     "@copilotkitnext/demo-agents": "workspace:^",
     "@copilotkitnext/runtime": "workspace:^",

diff --git a/apps/angular/demo-server/src/index.ts b/apps/angular/demo-server/src/index.ts
@@ -1,20 +1,19 @@
 import { serve } from "@hono/node-server";
 import { Hono } from "hono";
 import { cors } from "hono/cors";
-import {
-  CopilotRuntime,
-  createCopilotEndpoint,
-  InMemoryAgentRunner,
-} from "@copilotkitnext/runtime";
-import {
-  OpenAIAgent,
-  SlowToolCallStreamingAgent,
-} from "@copilotkitnext/demo-agents";
+import { CopilotRuntime, createCopilotEndpoint, InMemoryAgentRunner } from "@copilotkitnext/runtime";
+import { OpenAIAgent, SlowToolCallStreamingAgent } from "@copilotkitnext/demo-agents";
+import { HttpAgent } from "@ag-ui/client";
+
+const multimodalAgent = new HttpAgent({
+  url: "http://localhost:8000/agent/multimodal_messages",
+});
 
 const runtime = new CopilotRuntime({
   agents: {
     // @ts-ignore
     default: new SlowToolCallStreamingAgent(),
+    multimodal: multimodalAgent,
   },
   runner: new InMemoryAgentRunner(),
 });
@@ -32,7 +31,7 @@ app.use(
     exposeHeaders: ["Content-Type"],
     credentials: true,
     maxAge: 86400,
-  })
+  }),
 );
 
 // Create the CopilotKit endpoint
@@ -46,6 +45,4 @@ app.route("/", copilotApp);
 
 const port = Number(process.env.PORT || 3001);
 serve({ fetch: app.fetch, port });
-console.log(
-  `CopilotKit runtime listening at http://localhost:${port}/api/copilotkit`
-);
+console.log(`CopilotKit runtime listening at http://localhost:${port}/api/copilotkit`);
diff --git a/apps/angular/demo/package.json b/apps/angular/demo/package.json
@@ -20,6 +20,10 @@
     "@angular/platform-browser": "^18.2.0",
     "@angular/platform-browser-dynamic": "^18.2.0",
     "@copilotkitnext/angular": "workspace:*",
+    "@copilotkitnext/shared": "workspace:*",
+    "uuid": "^11.1.0",
+    "@ag-ui/client": "0.0.40-alpha.7",
+    "partial-json": "^0.1.7",
     "rxjs": "^7.8.1",
     "tslib": "^2.8.1",
     "zone.js": "^0.14.0"

diff --git a/apps/angular/demo/src/app/routes/headless/headless-chat.component.ts b/apps/angular/demo/src/app/routes/headless/headless-chat.component.ts
@@ -1,8 +1,21 @@
-import { Component, ChangeDetectionStrategy, computed, inject } from "@angular/core";
+import {
+  Component,
+  ChangeDetectionStrategy,
+  ElementRef,
+  ViewChild,
+  computed,
+  inject,
+} from "@angular/core";
 import { CommonModule } from "@angular/common";
 import { FormsModule } from "@angular/forms";
 import { CopilotKit, injectAgentStore } from "@copilotkitnext/angular";
 import { RenderToolCalls } from "@copilotkitnext/angular";
+import type { BinaryInputContent, InputContent, Message, TextInputContent } from "@ag-ui/client";
+import {
+  getUserMessageBinaryContents,
+  getUserMessageTextContent,
+  isUserMessageContentEmpty,
+} from "@copilotkitnext/shared";
 
 @Component({
   selector: "headless-chat",
@@ -16,7 +29,48 @@ import { RenderToolCalls } from "@copilotkitnext/angular";
           <div style="font-weight:600;color:#374151;">
             {{ m.role | titlecase }}
           </div>
-          <div style="white-space:pre-wrap">{{ m.content }}</div>
+          <div style="white-space:pre-wrap" *ngIf="messageText(m) as text">{{ text }}</div>
+          <ng-container *ngIf="m.role === 'user'">
+            <ng-container *ngIf="userAttachments(m) as attachments">
+              <div
+                *ngIf="attachments.length"
+                style="margin-top:8px;display:flex;gap:12px;flex-wrap:wrap;"
+              >
+                <ng-container *ngFor="let attachment of attachments; trackBy: trackAttachment">
+                  <figure
+                    *ngIf="isImage(attachment); else fileAttachment"
+                    style="display:flex;flex-direction:column;gap:6px;max-width:160px;"
+                  >
+                    <img
+                      [src]="resolveSource(attachment)"
+                      [alt]="attachment.filename || attachment.id || attachment.mimeType"
+                      style="width:100%;border-radius:8px;border:1px solid #d1d5db;object-fit:contain;background:#fff;"
+                    />
+                    <figcaption style="font-size:12px;color:#4b5563;">
+                      {{ attachment.filename || attachment.id || 'Attachment' }}
+                    </figcaption>
+                  </figure>
+                  <ng-template #fileAttachment>
+                    <div
+                      style="padding:10px 12px;border-radius:8px;border:1px dashed #cbd5f5;background:#f8fafc;color:#1f2937;font-size:12px;"
+                    >
+                      <div style="font-weight:600;">{{ attachment.filename || attachment.id || 'Attachment' }}</div>
+                      <div style="margin-top:4px;word-break:break-all;">{{ attachment.mimeType }}</div>
+                      <a
+                        *ngIf="resolveSource(attachment) as href"
+                        [href]="href"
+                        target="_blank"
+                        rel="noreferrer"
+                        style="display:inline-block;margin-top:6px;color:#2563eb;text-decoration:underline;"
+                      >
+                        Open
+                      </a>
+                    </div>
+                  </ng-template>
+                </ng-container>
+              </div>
+            </ng-container>
+          </ng-container>
           <ng-container *ngIf="m.role === 'assistant'">
             <copilot-render-tool-calls
               [message]="m"
@@ -30,8 +84,44 @@ import { RenderToolCalls } from "@copilotkitnext/angular";
 
       <form
         (ngSubmit)="send()"
-        style="display:flex;gap:8px;padding:12px;background:#ffffff;border-top:1px solid #e5e7eb;"
+        style="display:flex;flex-direction:column;gap:12px;padding:12px;background:#ffffff;border-top:1px solid #e5e7eb;"
       >
+        <div style="display:flex;align-items:center;gap:8px;flex-wrap:wrap;">
+          <input
+            #fileInput
+            type="file"
+            multiple
+            (change)="onFilesSelected($event)"
+            [disabled]="isRunning()"
+            style="padding:8px;border-radius:8px;border:1px dashed #cbd5f5;background:#f8fafc;color:#1e293b;"
+          />
+          <button
+            type="button"
+            *ngIf="selectedFiles.length"
+            (click)="clearSelectedFiles()"
+            style="padding:8px 10px;border-radius:6px;border:1px solid #d1d5db;background:#f9fafb;color:#1f2937;cursor:pointer;"
+          >
+            Clear files
+          </button>
+        </div>
+
+        <div *ngIf="selectedFiles.length" style="display:flex;gap:8px;flex-wrap:wrap;">
+          <span
+            *ngFor="let file of selectedFiles; let i = index"
+            style="display:inline-flex;align-items:center;gap:6px;padding:6px 10px;border-radius:9999px;background:#e0f2fe;color:#1e3a8a;font-size:12px;"
+          >
+            {{ file.name }}
+            <button
+              type="button"
+              (click)="removeFile(i)"
+              style="border:none;background:transparent;color:#1e3a8a;font-weight:600;cursor:pointer;"
+              aria-label="Remove file"
+            >
+              ×
+            </button>
+          </span>
+        </div>
+
         <input
           name="message"
           [(ngModel)]="inputValue"
@@ -41,8 +131,8 @@ import { RenderToolCalls } from "@copilotkitnext/angular";
         />
         <button
           type="submit"
-          [disabled]="!inputValue.trim() || isRunning()"
-          style="padding:10px 14px;border-radius:8px;border:1px solid #1d4ed8;background:#2563eb;color:#ffffff;cursor:pointer;"
+          [disabled]="isSendButtonDisabled()"
+          style="align-self:flex-end;padding:10px 14px;border-radius:8px;border:1px solid #1d4ed8;background:#2563eb;color:#ffffff;cursor:pointer;"
         >
           Send
         </button>
@@ -51,28 +141,173 @@ import { RenderToolCalls } from "@copilotkitnext/angular";
   `,
 })
 export class HeadlessChatComponent {
-  readonly agentStore = injectAgentStore("default");
+  readonly agentStore = injectAgentStore("multimodal");
   readonly agent = computed(() => this.agentStore()?.agent);
   readonly isRunning = computed(() => !!this.agentStore()?.isRunning());
   readonly messages = computed(() => this.agentStore()?.messages());
   readonly copilotkit = inject(CopilotKit);
 
+  @ViewChild("fileInput") fileInput?: ElementRef<HTMLInputElement>;
+
   inputValue = "";
+  selectedFiles: File[] = [];
+
+  onFilesSelected(event: Event) {
+    const input = event.target as HTMLInputElement | null;
+    const files = input?.files ? Array.from(input.files) : [];
+    if (files.length === 0) {
+      return;
+    }
+
+    const existingKeys = new Set(this.selectedFiles.map((file) => this.#fileKey(file)));
+    const merged: File[] = [...this.selectedFiles];
+
+    for (const file of files) {
+      const key = this.#fileKey(file);
+      if (!existingKeys.has(key)) {
+        merged.push(file);
+        existingKeys.add(key);
+      }
+    }
+
+    this.selectedFiles = merged;
+
+    if (input) {
+      input.value = "";
+    }
+  }
+
+  removeFile(index: number) {
+    if (index < 0 || index >= this.selectedFiles.length) {
+      return;
+    }
+    this.selectedFiles = this.selectedFiles.filter((_, i) => i !== index);
+    if (this.selectedFiles.length === 0 && this.fileInput?.nativeElement) {
+      this.fileInput.nativeElement.value = "";
+    }
+  }
+
+  clearSelectedFiles() {
+    this.selectedFiles = [];
+    if (this.fileInput?.nativeElement) {
+      this.fileInput.nativeElement.value = "";
+    }
+  }
+
+  isSendButtonDisabled(): boolean {
+    if (this.isRunning()) {
+      return true;
+    }
+    const hasText = this.inputValue.trim().length > 0;
+    const hasFiles = this.selectedFiles.length > 0;
+    return !hasText && !hasFiles;
+  }
 
   async send() {
     const content = this.inputValue.trim();
     const agent = this.agent();
     const isRunning = this.isRunning();
 
-    if (!agent || !content || isRunning) return;
+    if (!agent || isRunning) return;
+
+    const attachments = await Promise.all(this.selectedFiles.map((file) => this.#fileToBinaryContent(file)));
+
+    const parts: InputContent[] = [];
+
+    if (content.length > 0) {
+      parts.push({
+        type: "text",
+        text: content,
+      } satisfies TextInputContent);
+    }
+
+    parts.push(...attachments);
+
+    if (isUserMessageContentEmpty(parts)) {
+      return;
+    }
 
-    agent.addMessage({ id: crypto.randomUUID(), role: "user", content });
+    const messageContent = attachments.length === 0 && parts.length === 1 && content.length > 0 ? content : parts;
+
+    agent.addMessage({ id: crypto.randomUUID(), role: "user", content: messageContent });
     this.inputValue = "";
+    this.clearSelectedFiles();
 
     try {
       await this.copilotkit.core.runAgent({ agent });
     } catch (e) {
       console.error("Agent run error", e);
     }
   }
+
+  messageText(message: Message): string | undefined {
+    if (message.role === "user") {
+      const text = getUserMessageTextContent(message.content ?? []);
+      return text.trim().length > 0 ? text : undefined;
+    }
+
+    if (typeof message.content === "string" && message.content.length > 0) {
+      return message.content;
+    }
+
+    return undefined;
+  }
+
+  userAttachments(message: Message): BinaryInputContent[] {
+    if (message.role !== "user") {
+      return [];
+    }
+    const content = (message.content ?? []) as string | InputContent[];
+    return getUserMessageBinaryContents(content);
+  }
+
+  resolveSource(attachment: BinaryInputContent): string | null {
+    if (attachment.url) {
+      return attachment.url;
+    }
+    if (attachment.data) {
+      return `data:${attachment.mimeType};base64,${attachment.data}`;
+    }
+    return null;
+  }
+
+  isImage(attachment: BinaryInputContent): boolean {
+    const source = this.resolveSource(attachment);
+    return !!source && attachment.mimeType.startsWith("image/");
+  }
+
+  trackAttachment(index: number, attachment: BinaryInputContent): string {
+    return attachment.id ?? attachment.url ?? attachment.filename ?? `${index}`;
+  }
+
+  async #fileToBinaryContent(file: File): Promise<BinaryInputContent> {
+    const data = await this.#readFileAsBase64(file);
+    return {
+      type: "binary",
+      mimeType: file.type || "application/octet-stream",
+      filename: file.name,
+      data,
+    } satisfies BinaryInputContent;
+  }
+
+  #fileKey(file: File): string {
+    return `${file.name}:${file.size}:${file.lastModified}:${file.type}`;
+  }
+
+  #readFileAsBase64(file: File): Promise<string> {
+    return new Promise((resolve, reject) => {
+      const reader = new FileReader();
+      reader.onload = () => {
+        const result = reader.result;
+        if (typeof result === "string") {
+          const commaIndex = result.indexOf(",");
+          resolve(commaIndex >= 0 ? result.slice(commaIndex + 1) : result);
+        } else {
+          reject(new Error("Unexpected file reader result"));
+        }
+      };
+      reader.onerror = () => reject(reader.error ?? new Error("Failed to read file"));
+      reader.readAsDataURL(file);
+    });
+  }
 }
diff --git a/apps/angular/demo/tsconfig.json b/apps/angular/demo/tsconfig.json
@@ -13,18 +13,16 @@
     "baseUrl": ".",
     "paths": {
       "@copilotkitnext/angular": [
-        "../../packages/angular/dist/index.d.ts",
-        "../../packages/angular/dist/fesm2022/copilotkit-angular.mjs"
-      ],
-      "@copilotkitnext/core": [
-        "../../packages/core/dist/index.d.ts",
-        "../../packages/core/dist/index.mjs",
-        "../../packages/core/src/index.ts"
+        "./node_modules/@copilotkitnext/angular/dist/index.d.ts",
+        "./node_modules/@copilotkitnext/angular/dist/fesm2022/copilotkit-angular.mjs"
       ],
       "@copilotkitnext/shared": [
-        "../../packages/shared/dist/index.d.ts",
-        "../../packages/shared/dist/index.mjs",
-        "../../packages/shared/src/index.ts"
+        "./node_modules/@copilotkitnext/shared/dist/index.d.ts",
+        "./node_modules/@copilotkitnext/shared/dist/index.mjs"
+      ],
+      "@ag-ui/client": [
+        "./node_modules/@ag-ui/client/dist/index.d.ts",
+        "./node_modules/@ag-ui/client/dist/index.mjs"
       ]
     }
   },