test(agent-context): always-on size gate (<= 120 lines)

Author: dmealing

server/typescript/packages/sdk/test/agent-context/size-gate.test.ts

@@ -0,0 +1,14 @@
+// test/agent-context/size-gate.test.ts
+import { test, expect } from "bun:test";
+import { join } from "node:path";
+import { assemble } from "../../src/agent-context/assemble.js";
+import { makeStack } from "../../src/agent-context/resolve.js";
+
+const CONTENT_ROOT = join(import.meta.dir, "../../../../../../agent-context");
+
+test("the always-on body stays <= 120 lines (cheap to import into a root CLAUDE.md)", () => {
+  const files = assemble({ contentRoot: CONTENT_ROOT, stack: makeStack(["typescript"], ["react", "tanstack"]) });
+  const agents = files.find((f) => f.path === ".metaobjects/AGENTS.md")!;
+  const lines = agents.contents.split("\n").length;
+  expect(lines).toBeLessThanOrEqual(120);
+});