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fix(translator): map mid-conversation system message to user in claude-to-openai

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Claude Code chèn role:system cuối messages[], trước đây bị map thành assistant
khiến hội thoại không kết thúc bằng user → provider OpenAI-compat (LiteLLM)
dịch ngược Anthropic trả 400 "assistant message prefill". Map system -> user
và wrap <system-reminder> để giữ ngữ nghĩa instruction.

Co-authored-by: Cursor <cursoragent@cursor.com>
This commit is contained in:
decolua
2026-06-29 15:53:26 +07:00
parent 7fa2e7f029
commit 749c2e3f9c
1 changed files with 16 additions and 0 deletions
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16
open-sse/translator/request/claude-to-openai.js
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@@ -129,8 +129,24 @@ function fixMissingToolResponsesOpenAI(messages) {
} }
} }
// Wrap mid-conversation system text so it ends as a user turn (avoids Anthropic prefill 400)
function systemReminderText(content) {
const parts = Array.isArray(content)
? content.filter(c => c?.type === CLAUDE_BLOCK.TEXT).map(c => c.text || "")
: [typeof content === "string" ? content : ""];
const text = parts.filter(Boolean).join("\n");
if (!text.trim()) return "";
return `<system-reminder>\n${text}\n</system-reminder>`;
}
// Convert single Claude message - returns single message or array of messages // Convert single Claude message - returns single message or array of messages
function convertClaudeMessage(msg) { function convertClaudeMessage(msg) {
// Mid-conversation system message -> user (per Anthropic placement rules)
if (msg.role === ROLE.SYSTEM) {
const text = systemReminderText(msg.content);
return text ? { role: ROLE.USER, content: text } : null;
}
const role = msg.role === ROLE.USER || msg.role === ROLE.TOOL ? ROLE.USER : ROLE.ASSISTANT; const role = msg.role === ROLE.USER || msg.role === ROLE.TOOL ? ROLE.USER : ROLE.ASSISTANT;
// Simple string content // Simple string content