Add Copilot-Vision-Request header for image requests

fixes #222

packages/ai/CHANGELOG.md

@@ -12,6 +12,8 @@
 
 - **Google baseUrl configuration**: Google provider now respects `baseUrl` configuration for custom endpoints or API proxies. ([#216](https://github.com/badlogic/pi-mono/issues/216), [#221](https://github.com/badlogic/pi-mono/pull/221) by [@theBucky](https://github.com/theBucky))
 
+- **GitHub Copilot vision requests**: Added `Copilot-Vision-Request` header when sending images to GitHub Copilot models. ([#222](https://github.com/badlogic/pi-mono/issues/222))
+
 ## [0.22.3] - 2025-12-16
 
 ### Added

packages/ai/src/providers/openai-completions.ts

@@ -309,6 +309,20 @@ function createClient(model: Model<"openai-completions">, context: Context, apiK
 		const isAgentCall = lastMessage ? lastMessage.role !== "user" : false;
 		headers["X-Initiator"] = isAgentCall ? "agent" : "user";
 		headers["Openai-Intent"] = "conversation-edits";
+
+		// Copilot requires this header when sending images
+		const hasImages = messages.some((msg) => {
+			if (msg.role === "user" && Array.isArray(msg.content)) {
+				return msg.content.some((c) => c.type === "image");
+			}
+			if (msg.role === "toolResult" && Array.isArray(msg.content)) {
+				return msg.content.some((c) => c.type === "image");
+			}
+			return false;
+		});
+		if (hasImages) {
+			headers["Copilot-Vision-Request"] = "true";
+		}
 	}
 
 	return new OpenAI({

packages/ai/src/providers/openai-responses.ts

@@ -317,6 +317,20 @@ function createClient(model: Model<"openai-responses">, context: Context, apiKey
 		const isAgentCall = lastMessage ? lastMessage.role !== "user" : false;
 		headers["X-Initiator"] = isAgentCall ? "agent" : "user";
 		headers["Openai-Intent"] = "conversation-edits";
+
+		// Copilot requires this header when sending images
+		const hasImages = messages.some((msg) => {
+			if (msg.role === "user" && Array.isArray(msg.content)) {
+				return msg.content.some((c) => c.type === "image");
+			}
+			if (msg.role === "toolResult" && Array.isArray(msg.content)) {
+				return msg.content.some((c) => c.type === "image");
+			}
+			return false;
+		});
+		if (hasImages) {
+			headers["Copilot-Vision-Request"] = "true";
+		}
 	}
 
 	return new OpenAI({