diff --git a/packages/coding-agent/src/extensibility/legacy-pi-coding-agent-shim.ts b/packages/coding-agent/src/extensibility/legacy-pi-coding-agent-shim.ts
index 1c67ea249..95c33a80c 100644
--- a/packages/coding-agent/src/extensibility/legacy-pi-coding-agent-shim.ts
+++ b/packages/coding-agent/src/extensibility/legacy-pi-coding-agent-shim.ts
@@ -13,7 +13,7 @@
  */
 
 import { Database } from "bun:sqlite";
-import * as fs from "node:fs/promises";
+import * as fs from "node:fs";
 import * as path from "node:path";
 import type { AgentToolResult, AgentToolUpdateCallback } from "@oh-my-pi/pi-agent-core";
 import { type AuthCredential, SqliteAuthCredentialStore, type TSchema } from "@oh-my-pi/pi-ai";
@@ -612,16 +612,16 @@ export function createLsToolDefinition(cwd: string, options?: LsToolOptions): To
 			const ops = options?.operations;
 			const exists = ops
 				? await ops.exists(absolutePath)
-				: await fs.stat(absolutePath).then(
+				: await fs.promises.stat(absolutePath).then(
 						() => true,
 						() => false,
 					);
 			if (!exists) throw new Error(`Path not found: ${absolutePath}`);
-			const stat = ops ? await ops.stat(absolutePath) : await fs.stat(absolutePath);
+			const stat = ops ? await ops.stat(absolutePath) : await fs.promises.stat(absolutePath);
 			if (!stat.isDirectory()) {
 				return { content: [{ type: "text", text: rawPath }] };
 			}
-			const entries = ops ? await ops.readdir(absolutePath) : await fs.readdir(absolutePath);
+			const entries = ops ? await ops.readdir(absolutePath) : await fs.promises.readdir(absolutePath);
 			const sorted = [...entries].sort((a, b) => a.localeCompare(b));
 			const limited = sorted.slice(0, limit);
 			const output = limited.join("\n");
@@ -1106,7 +1106,7 @@ export class DefaultResourceLoader implements ResourceLoader {
 				: path.resolve(this.#state.cwd, resourcePath);
 			const files: string[] = [];
 			try {
-				const stat = await fs.stat(resolvedPath);
+				const stat = await fs.promises.stat(resolvedPath);
 				if (stat.isDirectory()) {
 					const glob = new Bun.Glob("**/*.md");
 					for await (const entry of glob.scan({ cwd: resolvedPath, absolute: false, onlyFiles: true })) {
@@ -1301,6 +1301,10 @@ export async function createAgentSession(
  * call `AuthStorage.create().get()` during module initialization.
  */
 export class AuthStorage {
+	constructor() {
+		fs.mkdirSync(path.dirname(getAgentDbPath()), { recursive: true, mode: 0o700 });
+	}
+
 	static create(): AuthStorage {
 		return new AuthStorage();
 	}
diff --git a/packages/coding-agent/test/issue-5879-legacy-event-stream-factory.test.ts b/packages/coding-agent/test/issue-5879-legacy-event-stream-factory.test.ts
index 12cb8f2fe..7880099bb 100644
--- a/packages/coding-agent/test/issue-5879-legacy-event-stream-factory.test.ts
+++ b/packages/coding-agent/test/issue-5879-legacy-event-stream-factory.test.ts
@@ -1,11 +1,17 @@
 import { describe, expect, it } from "bun:test";
 import * as path from "node:path";
 import { loadExtensions } from "@oh-my-pi/pi-coding-agent/extensibility/extensions/loader";
-import { TempDir } from "@oh-my-pi/pi-utils";
+import { __resetDirsFromEnvForTests, setAgentDir, TempDir } from "@oh-my-pi/pi-utils";
 
 describe("issue #5879: legacy provider compatibility", () => {
-	it("loads an extension that calls historical stream and auth exports", async () => {
+	it("creates a fresh agent database while loading historical auth exports", async () => {
 		const projectDir = TempDir.createSync("@issue-5879-");
+		const freshAgentDir = projectDir.join("fresh", "agent");
+		const originalDirEnv: Record<string, string | undefined> = {
+			PI_CODING_AGENT_DIR: process.env.PI_CODING_AGENT_DIR,
+			OMP_PROFILE: process.env.OMP_PROFILE,
+			PI_PROFILE: process.env.PI_PROFILE,
+		};
 		const extensionPath = path.join(projectDir.path(), "pi-provider-like-plugin", "index.ts");
 		await Bun.write(
 			extensionPath,
@@ -22,12 +28,21 @@ describe("issue #5879: legacy provider compatibility", () => {
 			].join("\n"),
 		);
 
+		setAgentDir(freshAgentDir);
+
 		try {
 			const result = await loadExtensions([extensionPath], projectDir.path());
 
 			expect(result.errors).toEqual([]);
 			expect(result.extensions).toHaveLength(1);
+			expect(await Bun.file(path.join(freshAgentDir, "agent.db")).exists()).toBe(true);
 		} finally {
+			for (const key in originalDirEnv) {
+				const value = originalDirEnv[key];
+				if (value === undefined) delete process.env[key];
+				else process.env[key] = value;
+			}
+			__resetDirsFromEnvForTests();
 			projectDir.removeSync();
 		}
 	});