docs: modifying the AI provider

Author: elithrar

README.md

@@ -127,6 +127,53 @@ Tools can be configured in two ways:
 1. With an `execute` function for automatic execution
 2. Without an `execute` function, requiring confirmation and using the `executions` object to handle the confirmed action
 
+### Use a different AI model provider
+
+The starting [`server.ts`](https://github.com/cloudflare/agents-starter/blob/main/src/server.ts) implementation uses the [`ai-sdk`](https://sdk.vercel.ai/docs/introduction) and the [OpenAI provider](https://sdk.vercel.ai/providers/ai-sdk-providers/openai), but you can use any AI model provider by:
+
+1. Installing an alternative AI provider for the `ai-sdk`, such as the [`workers-ai-provider`](https://sdk.vercel.ai/providers/community-providers/cloudflare-workers-ai) or [`anthropic`](https://sdk.vercel.ai/providers/ai-sdk-providers/anthropic) provider:
+2. Replacing the AI SDK with the [OpenAI SDK](https://github.com/openai/openai-node)
+3. Using the Cloudflare [Workers AI + AI Gateway](https://developers.cloudflare.com/ai-gateway/providers/workersai/#workers-binding) binding API directly
+
+For example, to use the [`workers-ai-provider`](https://sdk.vercel.ai/providers/community-providers/cloudflare-workers-ai), install the package:
+
+```sh
+npm install workers-ai-provider
+```
+
+Add an `ai` binding to `wrangler.jsonc`:
+
+```jsonc
+// rest of file
+  "ai": {
+    "binding": "AI"
+  }
+// rest of file
+```
+
+Replace the `@ai-sdk/openai` import and usage with the `workers-ai-provider`:
+
+```diff
+// server.ts
+// Change the imports
+- import { createOpenAI } from "@ai-sdk/openai";
++ import { createWorkersAI } from 'workers-ai-provider';
+
+// Create a Workers AI instance
+- const openai = createOpenAI({
+-     apiKey: this.env.OPENAI_API_KEY,
+- });
++ const workersai = createWorkersAI({ binding: env.AI });
+
+// Use it when calling the streamText method (or other methods)
+// from the ai-sdk
+- const result = streamText({
+-    model: openai("gpt-4o-2024-11-20"),
++ const model = workersai("@cf/deepseek-ai/deepseek-r1-distill-qwen-32b")
+```
+
+Commit your changes and then run the `agents-starter` as per the rest of this README.
+
 ### Modifying the UI
 
 The chat interface is built with React and can be customized in `app.tsx`: