fix(github-copilot): preserve reasoning IDs for Copilot Codex models (#71684)

* fix(github-copilot): preserve all reasoning IDs and add gpt-5.3-codex support

The existing guard (8fd15ed0e5) only skipped rewriting reasoning item IDs
when encrypted_content was a non-null string. When gpt-5.3-codex is used
via GitHub Copilot, the model falls through to the forward-compat catch-all
with reasoning:false, so encrypted_content is never requested and arrives
as null — bypassing the guard and causing a rewrite. Copilot validates
reasoning item IDs server-side regardless of whether the client includes
encrypted_content, so the rewritten id triggers the 400 error.

Two changes:

1. connection-bound-ids.ts: skip ALL reasoning items unconditionally.
   Reasoning items always reference server-side state bound to their
   original ID; rewriting any of them breaks Copilot's lookup.

2. models.ts + index.ts: extend the forward-compat cloning logic to
   cover gpt-5.3-codex (adds it to the template-target set and to
   CODEX_TEMPLATE_MODEL_IDS so it can also serve as a template source
   for gpt-5.4). Adds gpt-5.3-codex to COPILOT_XHIGH_MODEL_IDS for
   the thinking profile.

Thanks @InvalidPandaa.

* docs(github-copilot): clarify gpt-5.3-codex is a no-op template for itself

https://claude.ai/code/session_01EAFmq4WyKkiUkVAqRXp4Bm

* fix(github-copilot): remove dead reasoning prefix branch in deriveReplacementId

https://claude.ai/code/session_01EAFmq4WyKkiUkVAqRXp4Bm

* fix(github-copilot): align reasoning id replay tests

* test(plugin-sdk): use cjs sidecar for require fast path

---------

Co-authored-by: Claude <noreply@anthropic.com>
Co-authored-by: Peter Steinberger <steipete@gmail.com>
This commit is contained in:
InvalidPanda ツ
2026-04-25 21:52:07 +02:00
committed by GitHub
parent 1d49b8cdaa
commit b64bfc5d9a
8 changed files with 101 additions and 36 deletions

View File

@@ -101,11 +101,17 @@ describe("wrapCopilotAnthropicStream", () => {
expect(baseStreamFn).toHaveBeenCalledWith(expect.anything(), expect.anything(), options);
});
it("adds Copilot headers and rewrites Responses connection-bound IDs before payload send", () => {
const connectionBoundId = Buffer.from(`reasoning-${"x".repeat(24)}`).toString("base64");
it("adds Copilot headers, preserves reasoning IDs, and rewrites message IDs before payload send", () => {
const reasoningId = Buffer.from(`reasoning-${"x".repeat(24)}`).toString("base64");
const messageId = Buffer.from(`message-${"y".repeat(24)}`).toString("base64");
const payloads: Array<{ input: Array<Record<string, unknown>> }> = [];
const baseStreamFn = vi.fn((_model, _context, options) => {
const payload = { input: [{ id: connectionBoundId, type: "reasoning" }] };
const payload = {
input: [
{ id: reasoningId, type: "reasoning" },
{ id: messageId, type: "message" },
],
};
options?.onPayload?.(payload, _model);
payloads.push(payload);
return {
@@ -144,7 +150,8 @@ describe("wrapCopilotAnthropicStream", () => {
"X-Test": "1",
},
});
expect(payloads[0]?.input[0]?.id).toMatch(/^rs_[a-f0-9]{16}$/);
expect(payloads[0]?.input[0]?.id).toBe(reasoningId);
expect(payloads[0]?.input[1]?.id).toMatch(/^msg_[a-f0-9]{16}$/);
});
it("rewrites Copilot Responses IDs returned by an existing payload hook", async () => {