diff --git a/tests/siax-access/idempotency.test.ts b/tests/siax-access/idempotency.test.ts
index b85f5fe..674e9a0 100644
--- a/tests/siax-access/idempotency.test.ts
+++ b/tests/siax-access/idempotency.test.ts
@@ -1,5 +1,10 @@
 import { describe, expect, it } from "vitest";
-import { operationFingerprint, operationIdentity, runIdempotentOperation } from "../../packages/siax-access/src/idempotency";
+import {
+  operationFingerprint,
+  operationIdentity,
+  runIdempotentOperation,
+  type IdempotencyStore,
+} from "../../packages/siax-access/src/idempotency";
 
 describe("@siax/access universal idempotency", () => {
   it("binds every result-affecting input into the fingerprint", () => {
@@ -18,7 +23,7 @@ describe("@siax/access universal idempotency", () => {
   });
   it("replays a stored receipt verbatim on the exact fingerprint", async () => {
     const stored = { x: 1 };
-    const store: any = {
+    const store: IdempotencyStore<unknown, { x: number }> = {
       start: async () => false,
       save: async () => {},
       receipt: async () => stored,
@@ -32,7 +37,7 @@ describe("@siax/access universal idempotency", () => {
   });
   it("claims once and saves only after the dispatch", async () => {
     const order: string[] = [];
-    const store: any = {
+    const store: IdempotencyStore<unknown, { x: number }> = {
       start: async () => { order.push("start"); return true; },
       save: async () => { order.push("save"); },
       receipt: async () => { order.push("receipt"); return undefined; },
@@ -47,7 +52,7 @@ describe("@siax/access universal idempotency", () => {
     expect(order).toEqual(["start", "dispatch", "save"]);
   });
   it("reports a store error as conflict, never as a fresh start", async () => {
-    const store: any = {
+    const store: IdempotencyStore<unknown, { x: number }> = {
       start: async () => { throw new Error("db down"); },
       save: async () => {},
       receipt: async () => { throw new Error("db down"); },
@@ -61,7 +66,7 @@ describe("@siax/access universal idempotency", () => {
     expect(dispatched).toBe(0);
   });
   it("does not rerun the dispatch when start succeeds but save later fails", async () => {
-    const store: any = { start: async () => true, save: async () => { throw new Error("journal write failed"); }, receipt: async () => undefined };
+    const store: IdempotencyStore<unknown, { x: number }> = { start: async () => true, save: async () => { throw new Error("journal write failed"); }, receipt: async () => undefined };
     let dispatched = 0;
     const outcome = await runIdempotentOperation({
       store, identity: {}, fingerprint: "fp",