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Pick any line to see why it is the way it is: the commit, the pull request and issue it came from, and what the agent was thinking.

Members can read a private repository's pull request forks1import assert from "node:assert/strict";
2import { createServer } from "node:http";
3import { test } from "node:test";
4
Auto model routing: the cheapest tier that can do each piece of work, a retry goes up a tier, and each run records its tier5import {
6 type AgentRouting,
7 type ChangeSize,
8 DEFAULT_ROUTING,
9 canReachModel,
10 changeSize,
11 chooseTier,
runner: a run sent straight to AI Gateway (no model proxy) carries a session in its metadata and on its billing run, so billing settles it to the gateway's price instead of keeping the sandbox's figure12 gatewaySession,
Auto model routing: the cheapest tier that can do each piece of work, a retry goes up a tier, and each run records its tier13 lastAttemptFailed,
14 modelEnv,
15 parseRouting,
16} from "./model-env.ts";
Members can read a private repository's pull request forks17
Auto model routing: the cheapest tier that can do each piece of work, a retry goes up a tier, and each run records its tier18const routes: AgentRouting = {
19 ...DEFAULT_ROUTING,
20 tiers: {
21 small: { modelName: "Claude Haiku 4.5", model: "claude-haiku-4-5-20251001" },
22 large: { modelName: "Claude Sonnet 5.5", model: "claude-sonnet-5-5" },
23 },
Members can read a private repository's pull request forks24};
Agents as a team: lifecycle, merge queue, billing and a new shell25const tags = { repo: "acme/site", pull: 12 };
Members can read a private repository's pull request forks26const direct = { ANTHROPIC_API_KEY: "sk-test", AI_GATEWAY_ID: "", CLOUDFLARE_ACCOUNT_ID: "acct" };
27
Agents as a team: lifecycle, merge queue, billing and a new shell28/** `ANTHROPIC_CUSTOM_HEADERS` as the harness reads it: one header per line. */
29function customHeaders(vars: Record<string, string>): Record<string, string> {
30 return Object.fromEntries(
31 vars.ANTHROPIC_CUSTOM_HEADERS.split("\n").map((line) => {
32 const at = line.indexOf(": ");
33 return [line.slice(0, at), line.slice(at + 2)];
34 }),
35 );
36}
37
Auto model routing: the cheapest tier that can do each piece of work, a retry goes up a tier, and each run records its tier38const small: ChangeSize = { files: 3, lines: 80, sensitive: [] };
39
40test("planning and catching up run on the small tier, making a change on the large", () => {
41 assert.equal(chooseTier("plan", {}, routes), "small");
42 assert.equal(chooseTier("update", {}, routes), "small");
43 assert.equal(chooseTier("implement", {}, routes), "large");
44 assert.equal(chooseTier("implement", { change: small }, routes), "large");
45});
46
47test("a review is small only for a small change that touches nothing sensitive", () => {
48 assert.equal(chooseTier("review", { change: small }, routes), "small");
49 assert.equal(chooseTier("review", { change: { ...small, lines: 200, files: 10 } }, routes), "small");
50 assert.equal(chooseTier("review", { change: { ...small, lines: 201 } }, routes), "large");
51 assert.equal(chooseTier("review", { change: { ...small, files: 11 } }, routes), "large");
52 assert.equal(chooseTier("review", { change: { ...small, sensitive: ["CI workflows"] } }, routes), "large");
53 assert.equal(chooseTier("review", { change: small, labels: ["Security"] }, routes), "large");
54 assert.equal(chooseTier("review", { change: small, labels: ["docs"] }, routes), "small");
55});
56
57test("a review of a change g1t cannot size runs on the large tier", () => {
58 assert.equal(chooseTier("review", {}, routes), "large");
59 assert.equal(chooseTier("review", { change: null }, routes), "large");
60 assert.equal(chooseTier("review", { change: { files: 0, lines: 0, sensitive: [] } }, routes), "large");
61});
62
63test("a retry after a failed attempt goes up to the large tier", () => {
64 assert.equal(chooseTier("plan", { retry: true }, routes), "large");
65 assert.equal(chooseTier("update", { retry: true }, routes), "large");
66 assert.equal(chooseTier("review", { change: small, retry: true }, routes), "large");
67});
68
69test("a retry is the same work again after its latest attempt failed", () => {
70 assert.equal(lastAttemptFailed([]), false);
71 assert.equal(lastAttemptFailed([{ status: "failed" }, { status: "succeeded" }]), true);
72 assert.equal(lastAttemptFailed([{ status: "succeeded" }, { status: "failed" }]), false);
73 assert.equal(lastAttemptFailed([{ status: "stopped", halted: "budget" }]), true);
74 assert.equal(lastAttemptFailed([{ status: "stopped", halted: null }]), false);
75 assert.equal(lastAttemptFailed([{ status: "running" }]), false);
76 assert.equal(lastAttemptFailed([{ status: "failed", title: "Add search" }], "Add search "), true);
77 assert.equal(lastAttemptFailed([{ status: "failed", title: "Add search" }], "Add billing"), false);
78});
79
80test("the configuration decides the tiers, the rules and the limits", () => {
81 const parsed = parseRouting(
82 JSON.stringify({
83 tiers: { small: { modelName: "Small", model: "small-1" } },
84 tasks: { update: "large" },
85 smallChange: { lines: 50 },
86 }),
87 );
88 assert.deepEqual(parsed.tiers.small, { modelName: "Small", model: "small-1" });
89 assert.deepEqual(parsed.tiers.large, DEFAULT_ROUTING.tiers.large);
90 assert.equal(chooseTier("update", {}, parsed), "large");
91 assert.equal(chooseTier("plan", {}, parsed), "small");
92 assert.equal(chooseTier("review", { change: { ...small, lines: 51 } }, parsed), "large");
93 assert.equal(chooseTier("review", { change: { ...small, files: 10, lines: 50 } }, parsed), "small");
94 assert.deepEqual(parseRouting(undefined), DEFAULT_ROUTING);
95 assert.deepEqual(parseRouting("not json"), DEFAULT_ROUTING);
Agents as a team: lifecycle, merge queue, billing and a new shell96});
97
Auto model routing: the cheapest tier that can do each piece of work, a retry goes up a tier, and each run records its tier98test("a change's size is its files and the lines added and removed", () => {
99 assert.deepEqual(
100 changeSize([{ additions: 10, deletions: 2 }, { additions: 0, deletions: 5 }], ["secrets"]),
101 { files: 2, lines: 17, sensitive: ["secrets"] },
102 );
103});
104
105test("the tier decides the model, and the harness's small tasks use the small tier", () => {
106 const large = modelEnv(direct, routes, "implement", "large", tags);
107 assert.equal(large.ANTHROPIC_MODEL, "claude-sonnet-5-5");
108 assert.equal(large.AGENT_MODEL_NAME, "Claude Sonnet 5.5");
109 assert.equal(large.ANTHROPIC_SMALL_FAST_MODEL, "claude-haiku-4-5-20251001");
110 assert.equal(large.ANTHROPIC_DEFAULT_HAIKU_MODEL, "claude-haiku-4-5-20251001");
111 const review = modelEnv(direct, routes, "review", "small", tags);
112 assert.equal(review.ANTHROPIC_MODEL, "claude-haiku-4-5-20251001");
113 assert.equal(review.AGENT_MODEL_NAME, "Claude Haiku 4.5");
114});
115
Members can read a private repository's pull request forks116test("without a gateway, requests go to the provider directly", () => {
Auto model routing: the cheapest tier that can do each piece of work, a retry goes up a tier, and each run records its tier117 const vars = modelEnv(direct, routes, "implement", "large", tags);
Members can read a private repository's pull request forks118 assert.equal(vars.ANTHROPIC_BASE_URL, undefined);
Agents as a team: lifecycle, merge queue, billing and a new shell119 assert.equal(vars.ANTHROPIC_CUSTOM_HEADERS, undefined);
120 assert.equal(vars.ANTHROPIC_API_KEY, "sk-test");
Members can read a private repository's pull request forks121});
122
Agents as a team: lifecycle, merge queue, billing and a new shell123test("with a gateway, requests go through it and say what they are for", () => {
Auto model routing: the cheapest tier that can do each piece of work, a retry goes up a tier, and each run records its tier124 const vars = modelEnv({ ...direct, AI_GATEWAY_ID: "g1t" }, routes, "review", "large", tags);
Members can read a private repository's pull request forks125 assert.equal(vars.ANTHROPIC_BASE_URL, "https://gateway.ai.cloudflare.com/v1/acct/g1t/anthropic");
Agents as a team: lifecycle, merge queue, billing and a new shell126 assert.deepEqual(customHeaders(vars), {
Auto model routing: the cheapest tier that can do each piece of work, a retry goes up a tier, and each run records its tier127 "cf-aig-metadata": '{"task":"review","tier":"large","repo":"acme/site","pull":12}',
Agents as a team: lifecycle, merge queue, billing and a new shell128 });
Members can read a private repository's pull request forks129});
130
runner: a run sent straight to AI Gateway (no model proxy) carries a session in its metadata and on its billing run, so billing settles it to the gateway's price instead of keeping the sandbox's figure131test("a run straight to the gateway carries its session, so billing can settle it", () => {
132 const session = gatewaySession();
133 assert.match(session, /^rs_[0-9a-f]{24}$/);
134 assert.notEqual(gatewaySession(), session);
135 const vars = modelEnv({ ...direct, AI_GATEWAY_ID: "g1t" }, routes, "implement", "small", { ...tags, session });
136 const metadata = JSON.parse(customHeaders(vars)["cf-aig-metadata"]);
137 assert.equal(metadata.session, session);
138 // The gateway keeps at most five metadata entries.
139 assert.ok(Object.keys(metadata).length <= 5);
140});
141
Members can read a private repository's pull request forks142test("an authenticated gateway is sent its token", () => {
Auto model routing: the cheapest tier that can do each piece of work, a retry goes up a tier, and each run records its tier143 const vars = modelEnv({ ...direct, AI_GATEWAY_ID: "g1t", AI_GATEWAY_TOKEN: "tok" }, routes, "implement", "large", tags);
Agents as a team: lifecycle, merge queue, billing and a new shell144 assert.equal(customHeaders(vars)["cf-aig-authorization"], "Bearer tok");
145 assert.equal(vars.ANTHROPIC_API_KEY, "sk-test");
Members can read a private repository's pull request forks146});
147
Agents as a team: lifecycle, merge queue, billing and a new shell148test("when the gateway holds the provider's key, the sandbox never gets it", () => {
149 const gatewayOnly = { AI_GATEWAY_ID: "g1t", AI_GATEWAY_TOKEN: "tok", CLOUDFLARE_ACCOUNT_ID: "acct" };
150 assert.equal(canReachModel(gatewayOnly), true);
Auto model routing: the cheapest tier that can do each piece of work, a retry goes up a tier, and each run records its tier151 assert.equal(modelEnv(gatewayOnly, routes, "implement", "large", tags).ANTHROPIC_API_KEY, "tok");
Agents as a team: lifecycle, merge queue, billing and a new shell152 assert.equal(canReachModel({ AI_GATEWAY_ID: "g1t", CLOUDFLARE_ACCOUNT_ID: "acct" }), false);
153 assert.equal(canReachModel(direct), true);
154});
155
Members can read a private repository's pull request forks156// A stand-in for the gateway: what a sandbox's agent sends, given these
157// variables, arrives at the gateway's path with both credentials.
158test("a request built from these variables reaches a gateway as expected", async () => {
Agents as a team: lifecycle, merge queue, billing and a new shell159 const seen: { url?: string; key?: string; gateway?: string; metadata?: string; model?: string } = {};
Members can read a private repository's pull request forks160 const server = createServer((request, response) => {
161 let body = "";
162 request.on("data", (chunk) => (body += chunk));
163 request.on("end", () => {
164 seen.url = request.url;
165 seen.key = request.headers["x-api-key"] as string;
166 seen.gateway = request.headers["cf-aig-authorization"] as string;
Agents as a team: lifecycle, merge queue, billing and a new shell167 seen.metadata = request.headers["cf-aig-metadata"] as string;
Members can read a private repository's pull request forks168 seen.model = JSON.parse(body).model;
169 response.setHeader("content-type", "application/json");
170 response.end(JSON.stringify({ type: "message", content: [] }));
171 });
172 });
173 await new Promise<void>((resolve) => server.listen(0, resolve));
174 const { port } = server.address() as { port: number };
175
Auto model routing: the cheapest tier that can do each piece of work, a retry goes up a tier, and each run records its tier176 const vars = modelEnv({ ...direct, AI_GATEWAY_ID: "g1t", AI_GATEWAY_TOKEN: "tok" }, routes, "implement", "large", tags);
Members can read a private repository's pull request forks177 // Same path as the real gateway, on the stand-in's address.
178 const base = vars.ANTHROPIC_BASE_URL.replace("https://gateway.ai.cloudflare.com", `http://localhost:${port}`);
179 await fetch(`${base}/v1/messages`, {
180 method: "POST",
Agents as a team: lifecycle, merge queue, billing and a new shell181 headers: { "x-api-key": vars.ANTHROPIC_API_KEY, ...customHeaders(vars), "content-type": "application/json" },
Members can read a private repository's pull request forks182 body: JSON.stringify({ model: vars.ANTHROPIC_MODEL, max_tokens: 1, messages: [] }),
183 });
184 server.close();
185
186 assert.deepEqual(seen, {
187 url: "/v1/acct/g1t/anthropic/v1/messages",
188 key: "sk-test",
189 gateway: "Bearer tok",
Auto model routing: the cheapest tier that can do each piece of work, a retry goes up a tier, and each run records its tier190 metadata: '{"task":"implement","tier":"large","repo":"acme/site","pull":12}',
Members can read a private repository's pull request forks191 model: "claude-sonnet-5-5",
192 });
193});