Added changelog entry

Author: Naapperas

src/content/changelog/workers-ai/2025-10-23-new-markdown-conversion-endpoint.mdx

@@ -0,0 +1,38 @@
+---
+title: 'Workers AI Markdown Conversion: New endpoint to list supported formats'
+description: You can now programmatically get a list of all supported file formats that can be converted by our Markdown Conversion utility.
+date: 2025-10-23
+---
+
+Developers can now programmatically retrieve a list of all file formats supported by the [Markdown Conversion utility](/workers-ai/features/markdown-conversion/) in Workers AI.
+
+You can use the [`env.AI`](/workers-ai/configuration/bindings/) binding:
+
+```typescript
+await env.AI.toMarkdown().supported()
+```
+
+Or call the REST API:
+
+```bash
+curl https://api.cloudflare.com/client/v4/accounts/{ACCOUNT_ID}/ai/tomarkdown/supported \
+  -H 'Authorization: Bearer {API_TOKEN}'
+```
+
+Both return a list of file formats that users can convert into Markdown:
+
+```json
+[
+	{
+		"extension": ".pdf",
+		"mimeType": "application/pdf",
+	},
+	{
+		"extension": ".jpeg",
+		"mimeType": "image/jpeg",
+	},
+	...
+]
+```
+
+Learn more about our [Markdown Conversion utility](/workers-ai/features/markdown-conversion/).