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fix(translator): preserve developer instructions in openai-responses conversion (#2434)

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Map role="developer" messages to top-level instructions alongside
role="system" in openaiToOpenAIResponsesRequest. Previously developer
messages matched no branch and were silently dropped from the Responses
request, losing GPT-5/Codex system-level prompts.

Co-authored-by: Cursor <cursoragent@cursor.com>
This commit is contained in:
deranalabs
2026-07-07 11:54:07 +07:00
committed by decolua
co-authored by Cursor
parent bf7da67859
commit a3cd7c82bc
2 changed files with 18 additions and 3 deletions
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open-sse/translator/request/openai-responses.js
+4 -3
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@@ -221,13 +221,14 @@ export function openaiToOpenAIResponsesRequest(model, body, stream, credentials)
const messages = body.messages || [];
for (const msg of messages) {
if (msg.role === ROLE.SYSTEM) {
// Use first system message as instructions
if (msg.role === ROLE.SYSTEM || msg.role === ROLE.DEVELOPER) {
// Use the first instruction-bearing message as instructions.
// OpenAI recommends role="developer" for GPT-5/Codex as the system-level prompt.
if (!hasSystemMessage) {
result.instructions = typeof msg.content === "string" ? msg.content : "";
hasSystemMessage = true;
}
continue; // Skip system messages in input
continue; // Skip instruction messages in input
}
// Convert user/assistant messages to input items