diff --git a/packages/sdk/js/src/v2/client.ts b/packages/sdk/js/src/v2/client.ts
index 67fe1de32f..577dce3115 100644
--- a/packages/sdk/js/src/v2/client.ts
+++ b/packages/sdk/js/src/v2/client.ts
@@ -77,6 +77,11 @@ export function createOpencodeClient(config?: Config & { directory?: string; exp
       workspace: config?.experimental_workspaceID,
     }),
   )
-  const result = new OpencodeClient({ client })
-  return result
+  client.interceptors.response.use((response) => {
+    const contentType = response.headers.get("content-type")
+    if (contentType === "text/html") throw new Error("Unexpected content-type: " + contentType)
+
+    return response
+  })
+  return new OpencodeClient({ client })
 }