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fix(agents): split system prompt cache prefix by transport (#59054)

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* fix(agents): restore Anthropic prompt cache seam

* fix(agents): strip cache boundary for completions

* fix(agents): strip cache boundary for cli backends

* chore(changelog): note cross-transport cache boundary rollout

* fix(agents): route default stream fallbacks through boundary shapers

* fix(agents): strip cache boundary for provider streams
This commit is contained in:
Vincent Koc
2026-04-04 13:32:32 +09:00
committed by GitHub
parent b0e1551eb8
commit 64f28906de
18 changed files with 480 additions and 34 deletions
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16
src/agents/cli-runner.helpers.test.ts
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@@ -4,6 +4,7 @@ import { MAX_IMAGE_BYTES } from "../media/constants.js";
import { buildCliArgs, loadPromptRefImages } from "./cli-runner/helpers.js";
import * as promptImageUtils from "./pi-embedded-runner/run/images.js";
import type { SandboxFsBridge } from "./sandbox/fs-bridge.js";
import { SYSTEM_PROMPT_CACHE_BOUNDARY } from "./system-prompt-cache-boundary.js";
import * as toolImages from "./tool-images.js";
describe("loadPromptRefImages", () => {
@@ -117,4 +118,19 @@ describe("buildCliArgs", () => {
}),
).toEqual(["exec", "resume", "thread-123", "--model", "gpt-5.4"]);
});
it("strips the internal cache boundary from CLI system prompt args", () => {
expect(
buildCliArgs({
backend: {
command: "claude",
systemPromptArg: "--append-system-prompt",
},
baseArgs: ["-p"],
modelId: "claude-sonnet-4-6",
systemPrompt: `Stable prefix${SYSTEM_PROMPT_CACHE_BOUNDARY}Dynamic suffix`,
useResume: false,
}),
).toEqual(["-p", "--append-system-prompt", "Stable prefix\nDynamic suffix"]);
});
});