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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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51
src/agents/pi-embedded-helpers.buildbootstrapcontextfiles.e2e.test.ts
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@@ -1,5 +1,9 @@
import { describe, expect, it } from "vitest";
import { buildBootstrapContextFiles, DEFAULT_BOOTSTRAP_MAX_CHARS } from "./pi-embedded-helpers.js";
import {
buildBootstrapContextFiles,
DEFAULT_BOOTSTRAP_MAX_CHARS,
DEFAULT_BOOTSTRAP_TOTAL_MAX_CHARS,
} from "./pi-embedded-helpers.js";
import { DEFAULT_AGENTS_FILENAME } from "./workspace.js";
const makeFile = (overrides: Partial<WorkspaceBootstrapFile>): WorkspaceBootstrapFile => ({
@@ -50,4 +54,49 @@ describe("buildBootstrapContextFiles", () => {
expect(result?.content).toBe(long);
expect(result?.content).not.toContain("[...truncated, read AGENTS.md for full content...]");
});
it("caps total injected bootstrap characters across files", () => {
const files = [
makeFile({ name: "AGENTS.md", content: "a".repeat(10_000) }),
makeFile({ name: "SOUL.md", path: "/tmp/SOUL.md", content: "b".repeat(10_000) }),
makeFile({ name: "USER.md", path: "/tmp/USER.md", content: "c".repeat(10_000) }),
];
const result = buildBootstrapContextFiles(files);
const totalChars = result.reduce((sum, entry) => sum + entry.content.length, 0);
expect(totalChars).toBeLessThanOrEqual(DEFAULT_BOOTSTRAP_TOTAL_MAX_CHARS);
expect(result).toHaveLength(3);
expect(result[2]?.content).toContain("[...truncated, read USER.md for full content...]");
});
it("enforces strict total cap even when truncation markers are present", () => {
const files = [
makeFile({ name: "AGENTS.md", content: "a".repeat(1_000) }),
makeFile({ name: "SOUL.md", path: "/tmp/SOUL.md", content: "b".repeat(1_000) }),
];
const result = buildBootstrapContextFiles(files, {
maxChars: 100,
totalMaxChars: 150,
});
const totalChars = result.reduce((sum, entry) => sum + entry.content.length, 0);
expect(totalChars).toBeLessThanOrEqual(150);
});
it("skips bootstrap injection when remaining total budget is too small", () => {
const files = [makeFile({ name: "AGENTS.md", content: "a".repeat(1_000) })];
const result = buildBootstrapContextFiles(files, {
maxChars: 200,
totalMaxChars: 40,
});
expect(result).toEqual([]);
});
it("keeps missing markers under small total budgets", () => {
const files = [makeFile({ missing: true, content: undefined })];
const result = buildBootstrapContextFiles(files, {
totalMaxChars: 20,
});
expect(result).toHaveLength(1);
expect(result[0]?.content.length).toBeLessThanOrEqual(20);
expect(result[0]?.content.startsWith("[MISSING]")).toBe(true);
});
});