fix(opencode): support native OpenAI OAuth fetch (#28571)

packages/llm/src/protocols/openai-responses.ts

@@ -82,6 +82,7 @@ const OpenAIResponsesToolChoice = Schema.Union([
 const OpenAIResponsesCoreFields = {
   model: Schema.String,
   input: Schema.Array(OpenAIResponsesInputItem),
+  instructions: Schema.optional(Schema.String),
   tools: optionalArray(OpenAIResponsesTool),
   tool_choice: Schema.optional(OpenAIResponsesToolChoice),
   store: Schema.optional(Schema.Boolean),
@@ -270,7 +271,9 @@ const lowerOptions = Effect.fn("OpenAIResponses.lowerOptions")(function* (reques
   const summary = OpenAIOptions.reasoningSummary(request)
   const encryptedState = OpenAIOptions.encryptedReasoning(request)
   const verbosity = OpenAIOptions.textVerbosity(request)
+  const instructions = OpenAIOptions.instructions(request)
   return {
+    ...(instructions ? { instructions } : {}),
     ...(store !== undefined ? { store } : {}),
     ...(promptCacheKey ? { prompt_cache_key: promptCacheKey } : {}),
     ...(encryptedState ? { include: ["reasoning.encrypted_content"] as const } : {}),

packages/llm/src/protocols/utils/openai-options.ts

@@ -52,4 +52,9 @@ export const textVerbosity = (request: LLMRequest) => {
   return isTextVerbosity(value) ? value : undefined
 }
 
+export const instructions = (request: LLMRequest) => {
+  const value = options(request)?.instructions
+  return typeof value === "string" ? value : undefined
+}
+
 export * as OpenAIOptions from "./openai-options"