diff --git a/actions/clients/fileClient.js b/actions/clients/fileClient.js
index e639bb30..c58c9748 100644
--- a/actions/clients/fileClient.js
+++ b/actions/clients/fileClient.js
@@ -1,17 +1,12 @@
 import { getJson, requestJson } from "./endpointClient";
-import { buildHashedQueryUrl } from "./relayClient";
+import { getSignedJson, postSignedJson } from "./signedRequestClient";
 
 export const getFileJson = (url) => {
     return getJson(url);
 };
 
 export const getSignedFileJson = async (queryUrl) => {
-    const signedUrl = await buildHashedQueryUrl(queryUrl);
-
-    return requestJson({
-        method: "get",
-        url: signedUrl
-    });
+    return getSignedJson(queryUrl);
 };
 
 export const downloadFileBlob = (url) => {
@@ -23,12 +18,5 @@ export const downloadFileBlob = (url) => {
 };
 
 export const postSignedFileJson = async (queryUrl, data, config = {}) => {
-    const signedUrl = await buildHashedQueryUrl(queryUrl);
-
-    return requestJson({
-        method: "post",
-        url: signedUrl,
-        data,
-        ...config
-    });
+    return postSignedJson(queryUrl, data, config);
 };
diff --git a/memory-bank/change-log.md b/memory-bank/change-log.md
index f41fef9f..489c8b30 100644
--- a/memory-bank/change-log.md
+++ b/memory-bank/change-log.md
@@ -2801,3 +2801,34 @@ Validation:
 Follow-ups:
 
 - Next bounded signed GET candidate in portal service is `sendRepCompleteMessage` (single signed URL + GET request path).
+
+---
+
+### CL-078: TASK22269 Slice B1.3 — fileClient signed helper delegation bundle
+
+date: 2026-03-25
+author: Cline
+scope: `actions/clients/fileClient.js`, `tests/phase22/file-client-behaviour.test.cjs`
+type: change
+rationale: Continue grouped signed-request consolidation by reducing duplicate signing logic in `fileClient` and delegating signed GET/POST operations to shared `signedRequestClient` helpers.
+impact: Centralizes signed method execution behavior in one helper layer and lowers drift risk across file-service call paths.
+status: completed
+
+Summary:
+
+- Updated `actions/clients/fileClient.js`:
+    - replaced direct `buildHashedQueryUrl + requestJson` logic in:
+        - `getSignedFileJson` -> now delegates to `getSignedJson`
+        - `postSignedFileJson` -> now delegates to `postSignedJson`
+    - retained `downloadFileBlob` and `getFileJson` behavior unchanged.
+- Updated `tests/phase22/file-client-behaviour.test.cjs` to assert delegation contracts for `getSignedJson` and `postSignedJson` rather than direct signing internals.
+
+Validation:
+
+- `npm run lint` -> pass with warnings only (pre-existing `react-hooks/exhaustive-deps`; no new lint errors)
+- `node tests/phase22/index.test.cjs` -> pass
+- `node tests/phase7/service-behaviour.test.cjs` -> pass (13/13)
+
+Follow-ups:
+
+- Candidate map now indicates remaining explicit signed request composition is primarily in account/portal signed GET edge paths (`getPortalLogin`, `sendRepCompleteMessage`, and signed suffix append flow in `sendCaseCompleteMessage`) for future bounded slices.
diff --git a/tests/phase22/file-client-behaviour.test.cjs b/tests/phase22/file-client-behaviour.test.cjs
index 767aad88..e648c954 100644
--- a/tests/phase22/file-client-behaviour.test.cjs
+++ b/tests/phase22/file-client-behaviour.test.cjs
@@ -24,8 +24,11 @@ const loadFileClientModule = (injected = {}) => {
         requestJson: async () => {
             throw new Error("requestJson not injected");
         },
-        buildHashedQueryUrl: async () => {
-            throw new Error("buildHashedQueryUrl not injected");
+        getSignedJson: async () => {
+            throw new Error("getSignedJson not injected");
+        },
+        postSignedJson: async () => {
+            throw new Error("postSignedJson not injected");
         },
         ...injected
     };
@@ -56,15 +59,10 @@ test("clients/fileClient getFileJson delegates to getJson", async () => {
 
 test("clients/fileClient getSignedFileJson signs url and requests json", async () => {
     const signedCalls = [];
-    const requestCalls = [];
 
     const mod = loadFileClientModule({
-        buildHashedQueryUrl: async (queryUrl) => {
+        getSignedJson: async (queryUrl) => {
             signedCalls.push(queryUrl);
-            return queryUrl + "&hash=signed";
-        },
-        requestJson: async (config) => {
-            requestCalls.push(config);
             return { deleted: true };
         }
     });
@@ -77,11 +75,9 @@ test("clients/fileClient getSignedFileJson signs url and requests json", async (
         deleted: true
     });
     assert.strictEqual(signedCalls.length, 1);
-    assert.strictEqual(requestCalls.length, 1);
-    assert.strictEqual(requestCalls[0].method, "get");
     assert.strictEqual(
-        requestCalls[0].url,
-        "/api/file/deleteblobcase?container=a&casefolderID=b&hash=signed"
+        signedCalls[0],
+        "/api/file/deleteblobcase?container=a&casefolderID=b"
     );
 });
 
@@ -106,15 +102,12 @@ test("clients/fileClient downloadFileBlob requests blob response", async () => {
 
 test("clients/fileClient postSignedFileJson signs url and posts payload", async () => {
     const signedCalls = [];
-    const requestCalls = [];
+    const postedCalls = [];
 
     const mod = loadFileClientModule({
-        buildHashedQueryUrl: async (queryUrl) => {
+        postSignedJson: async (queryUrl, data, config) => {
             signedCalls.push(queryUrl);
-            return queryUrl + "&hash=signed-post";
-        },
-        requestJson: async (config) => {
-            requestCalls.push(config);
+            postedCalls.push({ data, config });
             return { uploaded: true };
         }
     });
@@ -132,18 +125,14 @@ test("clients/fileClient postSignedFileJson signs url and posts payload", async
         uploaded: true
     });
     assert.strictEqual(signedCalls.length, 1);
-    assert.strictEqual(requestCalls.length, 1);
-    assert.strictEqual(requestCalls[0].method, "post");
-    assert.strictEqual(
-        requestCalls[0].url,
-        "/api/file/uploadsinglefile&hash=signed-post"
-    );
+    assert.strictEqual(postedCalls.length, 1);
+    assert.strictEqual(signedCalls[0], "/api/file/uploadsinglefile");
     assert.deepStrictEqual(
-        JSON.parse(JSON.stringify(requestCalls[0].data)),
+        JSON.parse(JSON.stringify(postedCalls[0].data)),
         payload
     );
     assert.strictEqual(
-        requestCalls[0].headers["content-type"],
+        postedCalls[0].config.headers["content-type"],
         "multipart/form-data"
     );
 });