diff --git a/src/__tests__/CodexACPAgent/e2e/acp-e2e.test.ts b/src/__tests__/CodexACPAgent/e2e/acp-e2e.test.ts
index f625f0d..8a76004 100644
--- a/src/__tests__/CodexACPAgent/e2e/acp-e2e.test.ts
+++ b/src/__tests__/CodexACPAgent/e2e/acp-e2e.test.ts
@@ -1,3 +1,4 @@
+import path from "node:path";
 import {afterEach, expect, it} from "vitest";
 import {AgentMode} from "../../../AgentMode";
 import {
@@ -90,17 +91,33 @@ describeE2E("E2E tests", () => {
         });
     });
 
-    it("lists a user skill from the wrapped CODEX_HOME", async () => {
+    it("lists skills", async () => {
         fixture = await createAuthenticatedFixture();
         fixture.writeSkill({
-            name: "integration-skill",
-            description: "Integration skill",
+            name: "codex-home-skill",
+            description: "Codex home skill",
             body: "This skill exists only for integration testing.",
         });
-        const session = await fixture.createSession();
+        const additionalSkillsRoot = path.join(fixture.workspaceDir, "custom-skills");
+        fixture.writeSkill({
+            name: "session-root-skill",
+            description: "Session root skill",
+            body: "This skill exists only in an additional root passed at session creation.",
+        }, additionalSkillsRoot);
+
+        const session = await fixture.connection.newSession({
+            cwd: fixture.workspaceDir,
+            mcpServers: [],
+            _meta: {
+                additionalRoots: [additionalSkillsRoot],
+            },
+        });
+
+        // Expecting skills from CODEX_HOME, workspace, and additional root
         await fixture.expectPromptText(session.sessionId, "/skills", (text) => {
             expect(text).toContain("Available skills:");
-            expect(text).toContain("- integration-skill: Integration skill");
+            expect(text).toContain("- codex-home-skill: Codex home skill");
+            expect(text).toContain("- session-root-skill: Session root skill");
         });
     });
 });
diff --git a/src/__tests__/CodexACPAgent/e2e/spawned-agent-fixture.ts b/src/__tests__/CodexACPAgent/e2e/spawned-agent-fixture.ts
index 17935e4..eddefcf 100644
--- a/src/__tests__/CodexACPAgent/e2e/spawned-agent-fixture.ts
+++ b/src/__tests__/CodexACPAgent/e2e/spawned-agent-fixture.ts
@@ -23,7 +23,7 @@ export interface SpawnedAgentFixture {
     readonly workspaceDir: string;
     createSession(mcpServers?: acp.McpServer[]): Promise<acp.NewSessionResponse>;
     restart(): Promise<SpawnedAgentFixture>;
-    writeSkill(skill: TestSkill): void;
+    writeSkill(skill: TestSkill, rootDir?: string): void;
     setPermissionResponder(responder: PermissionResponder): void;
     expectPromptText(
         sessionId: string,
@@ -171,8 +171,9 @@ class SpawnedAgentFixtureImpl implements SpawnedAgentFixture {
         return await createSpawnedAgentFixture(this.initializeConnection, this.extraEnv, this.paths);
     }
 
-    writeSkill(skill: TestSkill): void {
-        const skillDirectory = path.join(this.paths.codexHome, "skills", skill.name);
+    writeSkill(skill: TestSkill, rootDir?: string): void {
+        const skillsRoot = rootDir ?? path.join(this.paths.codexHome, "skills");
+        const skillDirectory = path.join(skillsRoot, skill.name);
         fs.mkdirSync(skillDirectory, {recursive: true});
         fs.writeFileSync(
             path.join(skillDirectory, "SKILL.md"),