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agents: reduce prompt token bloat from exec and context (#16539)

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Merged via /review-pr -> /prepare-pr -> /merge-pr.

Prepared head SHA: 8e1635fa3f
Co-authored-by: CharlieGreenman <8540141+CharlieGreenman@users.noreply.github.com>
Co-authored-by: gumadeiras <5599352+gumadeiras@users.noreply.github.com>
Reviewed-by: @gumadeiras
This commit is contained in:
Charlie Greenman
2026-02-14 18:32:45 -05:00
committed by GitHub
parent 2547514b47
commit dec6859702
23 changed files with 403 additions and 39 deletions
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37
src/agents/bash-tools.process.ts
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@@ -30,6 +30,25 @@ type WritableStdin = {
end: () => void;
destroyed?: boolean;
};
const DEFAULT_LOG_TAIL_LINES = 200;
function resolveLogSliceWindow(offset?: number, limit?: number) {
const usingDefaultTail = offset === undefined && limit === undefined;
const effectiveLimit =
typeof limit === "number" && Number.isFinite(limit)
? limit
: usingDefaultTail
? DEFAULT_LOG_TAIL_LINES
: undefined;
return { effectiveOffset: offset, effectiveLimit, usingDefaultTail };
}
function defaultTailNote(totalLines: number, usingDefaultTail: boolean) {
if (!usingDefaultTail || totalLines <= DEFAULT_LOG_TAIL_LINES) {
return "";
}
return `\n\n[showing last ${DEFAULT_LOG_TAIL_LINES} of ${totalLines} lines; pass offset/limit to page]`;
}
const processSchema = Type.Object({
action: Type.String({ description: "Process action" }),
@@ -294,13 +313,15 @@ export function createProcessTool(
details: { status: "failed" },
};
}
const window = resolveLogSliceWindow(params.offset, params.limit);
const { slice, totalLines, totalChars } = sliceLogLines(
scopedSession.aggregated,
params.offset,
params.limit,
window.effectiveOffset,
window.effectiveLimit,
);
const logDefaultTailNote = defaultTailNote(totalLines, window.usingDefaultTail);
return {
content: [{ type: "text", text: slice || "(no output yet)" }],
content: [{ type: "text", text: (slice || "(no output yet)") + logDefaultTailNote }],
details: {
status: scopedSession.exited ? "completed" : "running",
sessionId: params.sessionId,
@@ -313,14 +334,18 @@ export function createProcessTool(
};
}
if (scopedFinished) {
const window = resolveLogSliceWindow(params.offset, params.limit);
const { slice, totalLines, totalChars } = sliceLogLines(
scopedFinished.aggregated,
params.offset,
params.limit,
window.effectiveOffset,
window.effectiveLimit,
);
const status = scopedFinished.status === "completed" ? "completed" : "failed";
const logDefaultTailNote = defaultTailNote(totalLines, window.usingDefaultTail);
return {
content: [{ type: "text", text: slice || "(no output recorded)" }],
content: [
{ type: "text", text: (slice || "(no output recorded)") + logDefaultTailNote },
],
details: {
status,
sessionId: params.sessionId,