refactor(agent): tighten harness environment and resources

packages/agent/test/harness/skills.test.ts

@@ -0,0 +1,65 @@
+import { symlink } from "node:fs/promises";
+import { join } from "node:path";
+import { describe, expect, it } from "vitest";
+import { NodeExecutionEnv } from "../../src/harness/execution-env.js";
+import { loadSkills } from "../../src/harness/skills.js";
+import { createTempDir } from "./session-test-utils.js";
+
+describe("loadSkills", () => {
+	it("loads SKILL.md files through the execution environment", async () => {
+		const root = createTempDir();
+		const env = new NodeExecutionEnv({ cwd: root });
+		await env.createDir(".agents/skills/example", { recursive: true });
+		await env.writeFile(
+			".agents/skills/example/SKILL.md",
+			`---
+name: example
+description: Example skill
+disable-model-invocation: true
+---
+Use this skill.
+`,
+		);
+
+		const skills = await loadSkills(env, ".agents/skills");
+
+		expect(skills).toEqual([
+			{
+				name: "example",
+				description: "Example skill",
+				content: "Use this skill.",
+				filePath: join(root, ".agents/skills/example/SKILL.md"),
+				disableModelInvocation: true,
+			},
+		]);
+	});
+
+	it("loads skills through symlinked directories", async () => {
+		const root = createTempDir();
+		const env = new NodeExecutionEnv({ cwd: root });
+		await env.createDir("actual/example", { recursive: true });
+		await env.writeFile(
+			"actual/example/SKILL.md",
+			"---\nname: example\ndescription: Example skill\n---\nUse this skill.",
+		);
+		await symlink(join(root, "actual"), join(root, "skills-link"));
+
+		const skills = await loadSkills(env, "skills-link");
+
+		expect(skills.map((skill) => skill.name)).toEqual(["example"]);
+		expect(skills[0]?.filePath).toBe(join(root, "skills-link/example/SKILL.md"));
+	});
+
+	it("loads direct markdown children only from the root directory", async () => {
+		const root = createTempDir();
+		const env = new NodeExecutionEnv({ cwd: root });
+		await env.createDir("skills/nested", { recursive: true });
+		await env.writeFile("skills/root.md", "---\ndescription: Root skill\n---\nRoot content");
+		await env.writeFile("skills/nested/ignored.md", "---\ndescription: Ignored\n---\nIgnored content");
+
+		const skills = await loadSkills(env, "skills");
+
+		expect(skills.map((skill) => skill.name)).toEqual(["skills"]);
+		expect(skills[0]?.content).toBe("Root content");
+	});
+});