refactor(test): reuse shared skill writer in skills e2e

src/agents/skills.e2e-test-helpers.ts

@@ -7,15 +7,21 @@ export async function writeSkill(params: {
   description: string;
   metadata?: string;
   body?: string;
+  frontmatterExtra?: string;
 }) {
-  const { dir, name, description, metadata, body } = params;
+  const { dir, name, description, metadata, body, frontmatterExtra } = params;
   await fs.mkdir(dir, { recursive: true });
+  const frontmatter = [
+    `name: ${name}`,
+    `description: ${description}`,
+    metadata ? `metadata: ${metadata}` : "",
+    frontmatterExtra ?? "",
+  ]
+    .filter((line) => line.trim().length > 0)
+    .join("\n");
   await fs.writeFile(
     path.join(dir, "SKILL.md"),
-    `---
-name: ${name}
-description: ${description}${metadata ? `\nmetadata: ${metadata}` : ""}
----
+    `---\n${frontmatter}\n---
 
 ${body ?? `# ${name}\n`}
 `,

src/agents/skills.e2e.test.ts

@@ -2,6 +2,7 @@ import fs from "node:fs/promises";
 import os from "node:os";
 import path from "node:path";
 import { afterEach, describe, expect, it } from "vitest";
+import { writeSkill } from "./skills.e2e-test-helpers.js";
 import {
   applySkillEnvOverrides,
   applySkillEnvOverridesFromSnapshot,
@@ -11,15 +12,6 @@ import {
   loadWorkspaceSkillEntries,
 } from "./skills.js";
 
-type SkillFixture = {
-  dir: string;
-  name: string;
-  description: string;
-  metadata?: string;
-  body?: string;
-  frontmatterExtra?: string;
-};
-
 const tempDirs: string[] = [];
 
 const makeWorkspace = async () => {
@@ -28,24 +20,6 @@ const makeWorkspace = async () => {
   return workspaceDir;
 };
 
-const writeSkill = async (params: SkillFixture) => {
-  const { dir, name, description, metadata, body, frontmatterExtra } = params;
-  await fs.mkdir(dir, { recursive: true });
-  const frontmatter = [
-    `name: ${name}`,
-    `description: ${description}`,
-    metadata ? `metadata: ${metadata}` : "",
-    frontmatterExtra ?? "",
-  ]
-    .filter((line) => line.trim().length > 0)
-    .join("\n");
-  await fs.writeFile(
-    path.join(dir, "SKILL.md"),
-    `---\n${frontmatter}\n---\n\n${body ?? `# ${name}\n`}`,
-    "utf-8",
-  );
-};
-
 const withClearedEnv = <T>(
   keys: string[],
   run: (original: Record<string, string | undefined>) => T,