test: migrate suites to e2e coverage layout

src/agents/pi-embedded-helpers.iscontextoverflowerror.e2e.test.ts

@@ -0,0 +1,57 @@
+import { describe, expect, it } from "vitest";
+import { isContextOverflowError } from "./pi-embedded-helpers.js";
+
+describe("isContextOverflowError", () => {
+  it("matches known overflow hints", () => {
+    const samples = [
+      "request_too_large",
+      "Request exceeds the maximum size",
+      "context length exceeded",
+      "Maximum context length",
+      "prompt is too long: 208423 tokens > 200000 maximum",
+      "Context overflow: Summarization failed",
+      "413 Request Entity Too Large",
+    ];
+    for (const sample of samples) {
+      expect(isContextOverflowError(sample)).toBe(true);
+    }
+  });
+
+  it("matches Anthropic 'Request size exceeds model context window' error", () => {
+    // Anthropic returns this error format when the prompt exceeds the context window.
+    // Without this fix, auto-compaction is NOT triggered because neither
+    // isContextOverflowError nor pi-ai's isContextOverflow recognizes this pattern.
+    // The user sees: "LLM request rejected: Request size exceeds model context window"
+    // instead of automatic compaction + retry.
+    const anthropicRawError =
+      '{"type":"error","error":{"type":"invalid_request_error","message":"Request size exceeds model context window"}}';
+    expect(isContextOverflowError(anthropicRawError)).toBe(true);
+  });
+
+  it("matches 'exceeds model context window' in various formats", () => {
+    const samples = [
+      "Request size exceeds model context window",
+      "request size exceeds model context window",
+      '400 {"type":"error","error":{"type":"invalid_request_error","message":"Request size exceeds model context window"}}',
+      "The request size exceeds model context window limit",
+    ];
+    for (const sample of samples) {
+      expect(isContextOverflowError(sample)).toBe(true);
+    }
+  });
+
+  it("ignores unrelated errors", () => {
+    expect(isContextOverflowError("rate limit exceeded")).toBe(false);
+    expect(isContextOverflowError("request size exceeds upload limit")).toBe(false);
+    expect(isContextOverflowError("model not found")).toBe(false);
+    expect(isContextOverflowError("authentication failed")).toBe(false);
+  });
+
+  it("ignores normal conversation text mentioning context overflow", () => {
+    // These are legitimate conversation snippets, not error messages
+    expect(isContextOverflowError("Let's investigate the context overflow bug")).toBe(false);
+    expect(isContextOverflowError("The mystery context overflow errors are strange")).toBe(false);
+    expect(isContextOverflowError("We're debugging context overflow issues")).toBe(false);
+    expect(isContextOverflowError("Something is causing context overflow messages")).toBe(false);
+  });
+});