core: expose v2 model listing API (#25821)

packages/core/src/github-copilot/openai-compatible-error.ts

@@ -0,0 +1,27 @@
+import { z, type ZodType } from "zod/v4"
+
+export const openaiCompatibleErrorDataSchema = z.object({
+  error: z.object({
+    message: z.string(),
+
+    // The additional information below is handled loosely to support
+    // OpenAI-compatible providers that have slightly different error
+    // responses:
+    type: z.string().nullish(),
+    param: z.any().nullish(),
+    code: z.union([z.string(), z.number()]).nullish(),
+  }),
+})
+
+export type OpenAICompatibleErrorData = z.infer<typeof openaiCompatibleErrorDataSchema>
+
+export type ProviderErrorStructure<T> = {
+  errorSchema: ZodType<T>
+  errorToMessage: (error: T) => string
+  isRetryable?: (response: Response, error?: T) => boolean
+}
+
+export const defaultOpenAICompatibleErrorStructure: ProviderErrorStructure<OpenAICompatibleErrorData> = {
+  errorSchema: openaiCompatibleErrorDataSchema,
+  errorToMessage: (data) => data.error.message,
+}