params.contextEngine = contextEngine;

params.contextTokenBudget = 300_000;

params.prompt = "current prompt survives";

params.currentInboundContext = { text: "current inbound context survives" };

const run = runCodexAppServerAttempt(params);

await harness.waitForMethod("turn/start");

const inputText = getRequestInputText(harness);

expect(inputText.length).toBeLessThanOrEqual(CODEX_TURN_START_TEXT_INPUT_MAX_CHARS);

expect(inputText).toContain("recent anchor");

expect(inputText).toContain("current inbound context survives");

expect(inputText).toContain("current prompt survives");

await harness.completeTurn();

promptInputRange: { start: number; end: number } | undefined,

turnPromptText: string,

): CodexProjectedContextRange | undefined => {

const promptTextInputOffset = promptInputRange

? promptInputRange.end - promptText.length

: undefined;

if (

!promptContextRange ||

!promptInputRange ||

promptTextInputOffset === undefined ||

promptInputRange.start < 0 ||

promptInputRange.end < promptInputRange.start ||

promptInputRange.end > prompt.length ||

prompt.slice(promptInputRange.start, promptInputRange.end) !== promptText ||

promptTextInputOffset < promptInputRange.start ||

prompt.slice(promptTextInputOffset, promptInputRange.end) !== promptText ||

!turnPromptText.endsWith(prompt)

) {

return undefined;

// earlier input span. The exact input range still covers prepend-only hooks.

const promptTextOffset = prompt.endsWith(promptText)

? prompt.length - promptText.length

: promptInputRange.end - promptText.length;

: promptTextInputOffset;

if (promptTextOffset < 0) {

return undefined;

}