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fix(ai): append system prompt to codex bridge message instead of converting to input

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Previously the system prompt was converted to an input message in convertMessages,
then stripped out by filterPiSystemPrompts. Now the system prompt is passed directly
to transformRequestBody and appended after CODEX_PI_BRIDGE in the bridge message.
This commit is contained in:
Mario Zechner 2026-01-05 06:03:07 +01:00
parent 9a147559c0
commit bb50738f7e
15 changed files with 908 additions and 127 deletions
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43
packages/ai/src/providers/openai-codex/request-transformer.ts
View file

@ -210,45 +210,22 @@ function filterInput(input: InputItem[] | undefined): InputItem[] | undefined {
});
}
function getContentText(item: InputItem): string {
if (typeof item.content === "string") {
return item.content;
}
if (Array.isArray(item.content)) {
return item.content
.filter((c) => typeof c === "object" && c !== null && (c as { type?: string }).type === "input_text")
.map((c) => (c as { text?: string }).text)
.filter((text): text is string => typeof text === "string")
.join("\n");
}
return "";
}
function isPiSystemPrompt(item: InputItem): boolean {
const isSystemRole = item.role === "developer" || item.role === "system";
if (!isSystemRole) return false;
const contentText = getContentText(item).trim();
if (!contentText) return false;
return contentText.startsWith(
"You are an expert coding assistant. You help users with coding tasks by reading files, executing commands",
);
}
async function filterPiSystemPrompts(input: InputItem[] | undefined): Promise<InputItem[] | undefined> {
if (!Array.isArray(input)) return input;
return input.filter((item) => item.role === "user" || !isPiSystemPrompt(item));
}
function addCodexBridgeMessage(input: InputItem[] | undefined, hasTools: boolean): InputItem[] | undefined {
function addCodexBridgeMessage(
input: InputItem[] | undefined,
hasTools: boolean,
systemPrompt?: string,
): InputItem[] | undefined {
if (!hasTools || !Array.isArray(input)) return input;
const bridgeText = systemPrompt ? `${CODEX_PI_BRIDGE}\n\n${systemPrompt}` : CODEX_PI_BRIDGE;
const bridgeMessage: InputItem = {
type: "message",
role: "developer",
content: [
{
type: "input_text",
text: CODEX_PI_BRIDGE,
text: bridgeText,
},
],
};
@ -278,6 +255,7 @@ export async function transformRequestBody(
codexInstructions: string,
options: CodexRequestOptions = {},
codexMode = true,
systemPrompt?: string,
): Promise<RequestBody> {
const normalizedModel = normalizeModel(body.model);
@ -290,8 +268,7 @@ export async function transformRequestBody(
body.input = filterInput(body.input);
if (codexMode) {
body.input = await filterPiSystemPrompts(body.input);
body.input = addCodexBridgeMessage(body.input, !!body.tools);
body.input = addCodexBridgeMessage(body.input, !!body.tools, systemPrompt);
} else {
body.input = addToolRemapMessage(body.input, !!body.tools);
}