From be42dbc2ca2d68b375dee254a0eb812c215bedce Mon Sep 17 00:00:00 2001
From: Stefan Hoelzl <1478183+stefanhoelzl@users.noreply.github.com>
Date: Tue, 29 Sep 2026 17:02:07 +0200
Subject: [PATCH] fix(e2e): give Claude a long-path config dir so the IDE
 server cannot abort

On Windows runners os.tmpdir() is an 8.3 short path (C:\Users\RUNNER~1\...).
The mock's CLAUDE_CONFIG_DIR inherited it, and the Claude extension, which
Claude installs into the IDE server mid-test, watches that folder from the
server process. libuv before 1.53.0 asserts on the first event in a
short-path watched directory (libuv#5010), so the whole IDE server aborted and
agent-turn failed with "No Claude session is running".

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
---
 e2e/agent-mock.ts | 17 +++++++++++++++--
 1 file changed, 15 insertions(+), 2 deletions(-)

diff --git a/e2e/agent-mock.ts b/e2e/agent-mock.ts
index f75e23ec..caf30492 100644
--- a/e2e/agent-mock.ts
+++ b/e2e/agent-mock.ts
@@ -19,7 +19,15 @@
  */
 import { getTextContent, LLMock, type ChatCompletionRequest } from "@copilotkit/aimock";
 import { test } from "@playwright/test";
-import { existsSync, mkdtempSync, readdirSync, readFileSync, rmSync, writeFileSync } from "node:fs";
+import {
+  existsSync,
+  mkdtempSync,
+  readdirSync,
+  readFileSync,
+  realpathSync,
+  rmSync,
+  writeFileSync,
+} from "node:fs";
 import { tmpdir } from "node:os";
 import { join } from "node:path";
 import type { Agent } from "./env.ts";
@@ -124,7 +132,12 @@ export function useAgentMock(options: AgentMockOptions = {}): AgentMockHandle {
 
   test.beforeAll(async () => {
     const agent = test.info().project.name as Agent;
-    configDir = mkdtempSync(join(tmpdir(), "ch-e2e-agent-"));
+    // The long form: Windows runners' temp dir is an 8.3 short path
+    // (C:\Users\RUNNER~1\...), and this becomes CLAUDE_CONFIG_DIR, which the
+    // Claude extension watches from inside the IDE server. libuv before 1.53.0
+    // aborts the whole server on the first event in a short-path watched
+    // directory (libuv#5010). Only `.native` expands short names.
+    configDir = realpathSync.native(mkdtempSync(join(tmpdir(), "ch-e2e-agent-")));
 
     // port 0: the suite already picks a free port for the IDE server rather than
     // colliding with a developer's running instance, and a mock is no different.