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fix(headroom): translate openai-responses input through OpenAI for compression

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Codex (openai-responses) body.input holds Responses items, not OpenAI
messages. Translate input -> OpenAI -> compress -> back to input so the
Responses contract is preserved. Fixes #1998

Co-authored-by: Cursor <cursoragent@cursor.com>
This commit is contained in:
Ankit
2026-06-26 11:12:10 +07:00
committed by decolua
co-authored by Cursor
parent fb543a1f39
commit d4d11357ab
2 changed files with 74 additions and 0 deletions
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open-sse/rtk/headroom.js
+24
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@@ -1,5 +1,9 @@
import { claudeToOpenAIRequest } from "../translator/request/claude-to-openai.js";
import { openaiToClaudeRequest } from "../translator/request/openai-to-claude.js";
import {
openaiResponsesToOpenAIRequest,
openaiToOpenAIResponsesRequest,
} from "../translator/request/openai-responses.js";
const DEFAULT_TIMEOUT_MS = 3000;
@@ -135,6 +139,26 @@ export async function compressWithHeadroom(body, { enabled, url, model, format,
return data;
}
// OpenAI Responses shape (Codex): body.input holds Responses items, NOT OpenAI
// messages. Translate input -> OpenAI -> compress -> translate back to input so
// body.input keeps the Responses contract (the proxy only understands OpenAI). (#1998)
if (format === "openai-responses") {
const oai = openaiResponsesToOpenAIRequest(model, body, false);
if (!Array.isArray(oai?.messages)) return null;
const data = await callCompress(url, oai.messages, model, timeoutMs, compressUserMessages, diagnostics || {});
if (!data) return null;
// input: undefined so the translator rebuilds input from the compressed
// messages instead of returning the original input unchanged.
const responsesBody = openaiToOpenAIResponsesRequest(
model,
{ ...oai, input: undefined, messages: data.messages },
false
);
if (Array.isArray(responsesBody?.input)) body.input = responsesBody.input;
if (diagnostics) diagnostics.after = captureSizeSnapshot(body);
return data;
}
// OpenAI shape: messages/input go straight to the proxy.
const key = Array.isArray(body.messages) ? "messages"
: Array.isArray(body.input) ? "input"