diff --git a/lib/start-proxy-action.js b/lib/start-proxy-action.js
index f234f866c..1c272cc61 100644
--- a/lib/start-proxy-action.js
+++ b/lib/start-proxy-action.js
@@ -119796,6 +119796,16 @@ async function extractProxy(logger, archive) {
     throw new StartProxyError("Failed to extract proxy archive." /* ExtractionFailed */);
   }
 }
+async function cacheProxy(logger, path2, filename, version) {
+  try {
+    return await toolcache.cacheDir(path2, filename, version);
+  } catch (error3) {
+    logger.error(
+      `Failed to add proxy archive from ${path2} to toolcache: ${getErrorMessage(error3)}`
+    );
+    throw new StartProxyError("Failed to add proxy to toolcache" /* CacheFailed */);
+  }
+}
 
 // src/start-proxy-action.ts
 var KEY_SIZE = 2048;
@@ -119960,7 +119970,8 @@ async function getProxyBinaryPath(logger) {
     );
     const temp = await downloadProxy(logger, proxyInfo.url, authorization);
     const extracted = await extractProxy(logger, temp);
-    proxyBin = await toolcache2.cacheDir(
+    proxyBin = await cacheProxy(
+      logger,
       extracted,
       proxyFileName,
       proxyInfo.version
diff --git a/src/start-proxy-action.ts b/src/start-proxy-action.ts
index fd00953e7..db55a9e05 100644
--- a/src/start-proxy-action.ts
+++ b/src/start-proxy-action.ts
@@ -10,6 +10,7 @@ import { getApiDetails, getAuthorizationHeaderFor } from "./api-client";
 import { KnownLanguage } from "./languages";
 import { getActionsLogger, Logger } from "./logging";
 import {
+  cacheProxy,
   Credential,
   credentialToStr,
   downloadProxy,
@@ -242,7 +243,8 @@ async function getProxyBinaryPath(logger: Logger): Promise<string> {
     );
     const temp = await downloadProxy(logger, proxyInfo.url, authorization);
     const extracted = await extractProxy(logger, temp);
-    proxyBin = await toolcache.cacheDir(
+    proxyBin = await cacheProxy(
+      logger,
       extracted,
       proxyFileName,
       proxyInfo.version,
diff --git a/src/start-proxy.test.ts b/src/start-proxy.test.ts
index ee9fbbd20..a5a089673 100644
--- a/src/start-proxy.test.ts
+++ b/src/start-proxy.test.ts
@@ -447,3 +447,29 @@ test(
     await startProxyExports.extractProxy(logger, "path");
   },
 );
+
+test("cacheProxy - returns file path on success", async (t) => {
+  await withRecordingLoggerAsync(async (logger) => {
+    const testPath = "/some/path";
+    sinon.stub(toolcache, "cacheDir").resolves(testPath);
+
+    const result = await startProxyExports.cacheProxy(
+      logger,
+      "/other/path",
+      "proxy",
+      "1.0",
+    );
+    t.is(result, testPath);
+  });
+});
+
+test(
+  "cacheProxy",
+  wrapFailureTest,
+  () => {
+    sinon.stub(toolcache, "cacheDir").throws();
+  },
+  async (logger) => {
+    await startProxyExports.cacheProxy(logger, "/other/path", "proxy", "1.0");
+  },
+);
diff --git a/src/start-proxy.ts b/src/start-proxy.ts
index 65ffc5c0e..16bf40367 100644
--- a/src/start-proxy.ts
+++ b/src/start-proxy.ts
@@ -24,6 +24,7 @@ import { ConfigurationError, getErrorMessage, isDefined } from "./util";
 export enum StartProxyErrorType {
   DownloadFailed = "Failed to download proxy archive.",
   ExtractionFailed = "Failed to extract proxy archive.",
+  CacheFailed = "Failed to add proxy to toolcache",
 }
 
 /**
@@ -453,3 +454,28 @@ export async function extractProxy(logger: Logger, archive: string) {
     throw new StartProxyError(StartProxyErrorType.ExtractionFailed);
   }
 }
+
+/**
+ * Attempts to store the proxy in the toolcache.
+ *
+ * @param logger The logger to use.
+ * @param path The source path to add to the toolcache.
+ * @param filename The filename of the proxy binary.
+ * @param version The version of the proxy.
+ * @returns The path to the directory in the toolcache.
+ */
+export async function cacheProxy(
+  logger: Logger,
+  path: string,
+  filename: string,
+  version: string,
+) {
+  try {
+    return await toolcache.cacheDir(path, filename, version);
+  } catch (error) {
+    logger.error(
+      `Failed to add proxy archive from ${path} to toolcache: ${getErrorMessage(error)}`,
+    );
+    throw new StartProxyError(StartProxyErrorType.CacheFailed);
+  }
+}