diff --git a/lib/analyze-action-post.js b/lib/analyze-action-post.js
index 19c987905e..a118f067ee 100644
--- a/lib/analyze-action-post.js
+++ b/lib/analyze-action-post.js
@@ -117806,6 +117806,11 @@ function isSafeArtifactUpload(codeQlVersion) {
 
 // src/feature-flags.ts
 var featureConfig = {
+  ["allow_toolcache_input" /* AllowToolcacheInput */]: {
+    defaultValue: false,
+    envVar: "CODEQL_ACTION_ALLOW_TOOLCACHE_INPUT",
+    minimumVersion: void 0
+  },
   ["cleanup_trap_caches" /* CleanupTrapCaches */]: {
     defaultValue: false,
     envVar: "CODEQL_ACTION_CLEANUP_TRAP_CACHES",
diff --git a/lib/analyze-action.js b/lib/analyze-action.js
index af3fb58319..0f0e38d97a 100644
--- a/lib/analyze-action.js
+++ b/lib/analyze-action.js
@@ -91095,6 +91095,11 @@ var DEFAULT_VERSION_FEATURE_FLAG_PREFIX = "default_codeql_version_";
 var DEFAULT_VERSION_FEATURE_FLAG_SUFFIX = "_enabled";
 var CODEQL_VERSION_ZSTD_BUNDLE = "2.19.0";
 var featureConfig = {
+  ["allow_toolcache_input" /* AllowToolcacheInput */]: {
+    defaultValue: false,
+    envVar: "CODEQL_ACTION_ALLOW_TOOLCACHE_INPUT",
+    minimumVersion: void 0
+  },
   ["cleanup_trap_caches" /* CleanupTrapCaches */]: {
     defaultValue: false,
     envVar: "CODEQL_ACTION_CLEANUP_TRAP_CACHES",
@@ -92299,7 +92304,7 @@ async function findOverridingToolsInCache(humanReadableVersion, logger) {
   }
   return void 0;
 }
-async function getCodeQLSource(toolsInput, defaultCliVersion, apiDetails, variant, tarSupportsZstd, logger) {
+async function getCodeQLSource(toolsInput, defaultCliVersion, apiDetails, variant, tarSupportsZstd, features, logger) {
   if (toolsInput && !isReservedToolsValue(toolsInput) && !toolsInput.startsWith("http")) {
     logger.info(`Using CodeQL CLI from local path ${toolsInput}`);
     const compressionMethod2 = inferCompressionMethod(toolsInput);
@@ -92338,7 +92343,10 @@ async function getCodeQLSource(toolsInput, defaultCliVersion, apiDetails, varian
     }
   } else if (toolsInput !== void 0 && toolsInput === CODEQL_TOOLCACHE_INPUT) {
     let latestToolcacheVersion;
-    const allowToolcacheValue = isDynamicWorkflow() || isInTestMode();
+    const allowToolcacheValueFF = await features.getValue(
+      "allow_toolcache_input" /* AllowToolcacheInput */
+    );
+    const allowToolcacheValue = allowToolcacheValueFF && (isDynamicWorkflow() || isInTestMode());
     if (allowToolcacheValue) {
       logger.info(
         `Attempting to use the latest CodeQL CLI version in the toolcache, as requested by 'tools: ${toolsInput}'.`
@@ -92354,9 +92362,15 @@ async function getCodeQLSource(toolsInput, defaultCliVersion, apiDetails, varian
           `Found no CodeQL CLI in the toolcache, ignoring 'tools: ${toolsInput}'...`
         );
       } else {
-        logger.warning(
-          `Ignoring 'tools: ${toolsInput}' because the workflow was not triggered dynamically.`
-        );
+        if (allowToolcacheValueFF) {
+          logger.warning(
+            `Ignoring 'tools: ${toolsInput}' because the workflow was not triggered dynamically.`
+          );
+        } else {
+          logger.info(
+            `Ignoring 'tools: ${toolsInput}' because the feature is not enabled.`
+          );
+        }
       }
       cliVersion2 = defaultCliVersion.cliVersion;
       tagName = defaultCliVersion.tagName;
@@ -92569,7 +92583,7 @@ function getCanonicalToolcacheVersion(cliVersion2, bundleVersion2, logger) {
   }
   return cliVersion2;
 }
-async function setupCodeQLBundle(toolsInput, apiDetails, tempDir, variant, defaultCliVersion, logger) {
+async function setupCodeQLBundle(toolsInput, apiDetails, tempDir, variant, defaultCliVersion, features, logger) {
   if (!await isBinaryAccessible("tar", logger)) {
     throw new ConfigurationError(
       "Could not find tar in PATH, so unable to extract CodeQL bundle."
@@ -92582,6 +92596,7 @@ async function setupCodeQLBundle(toolsInput, apiDetails, tempDir, variant, defau
     apiDetails,
     variant,
     zstdAvailability.available,
+    features,
     logger
   );
   let codeqlFolder;
@@ -92739,7 +92754,7 @@ var GHES_VERSION_MOST_RECENTLY_DEPRECATED = "3.13";
 var GHES_MOST_RECENT_DEPRECATION_DATE = "2025-06-19";
 var EXTRACTION_DEBUG_MODE_VERBOSITY = "progress++";
 var CODEQL_VERSION_CACHE_CLEANUP = "2.17.1";
-async function setupCodeQL(toolsInput, apiDetails, tempDir, variant, defaultCliVersion, logger, checkVersion) {
+async function setupCodeQL(toolsInput, apiDetails, tempDir, variant, defaultCliVersion, features, logger, checkVersion) {
   try {
     const {
       codeqlFolder,
@@ -92753,6 +92768,7 @@ async function setupCodeQL(toolsInput, apiDetails, tempDir, variant, defaultCliV
       tempDir,
       variant,
       defaultCliVersion,
+      features,
       logger
     );
     logger.debug(
@@ -95404,7 +95420,7 @@ async function addFingerprints(sarif, sourceRoot, logger) {
 // src/init.ts
 var toolrunner4 = __toESM(require_toolrunner());
 var io6 = __toESM(require_io());
-async function initCodeQL(toolsInput, apiDetails, tempDir, variant, defaultCliVersion, logger) {
+async function initCodeQL(toolsInput, apiDetails, tempDir, variant, defaultCliVersion, features, logger) {
   logger.startGroup("Setup CodeQL tools");
   const {
     codeql,
@@ -95418,6 +95434,7 @@ async function initCodeQL(toolsInput, apiDetails, tempDir, variant, defaultCliVe
     tempDir,
     variant,
     defaultCliVersion,
+    features,
     logger,
     true
   );
@@ -95564,6 +95581,7 @@ async function combineSarifFilesUsingCLI(sarifFiles, gitHubVersion, features, lo
       tempDir,
       gitHubVersion.type,
       codeQLDefaultVersionInfo,
+      features,
       logger
     );
     codeQL = initCodeQLResult.codeql;
diff --git a/lib/autobuild-action.js b/lib/autobuild-action.js
index adf440738a..ef95f3e146 100644
--- a/lib/autobuild-action.js
+++ b/lib/autobuild-action.js
@@ -78544,6 +78544,11 @@ function isSupportedToolsFeature(versionInfo, feature) {
 var DEFAULT_VERSION_FEATURE_FLAG_PREFIX = "default_codeql_version_";
 var DEFAULT_VERSION_FEATURE_FLAG_SUFFIX = "_enabled";
 var featureConfig = {
+  ["allow_toolcache_input" /* AllowToolcacheInput */]: {
+    defaultValue: false,
+    envVar: "CODEQL_ACTION_ALLOW_TOOLCACHE_INPUT",
+    minimumVersion: void 0
+  },
   ["cleanup_trap_caches" /* CleanupTrapCaches */]: {
     defaultValue: false,
     envVar: "CODEQL_ACTION_CLEANUP_TRAP_CACHES",
diff --git a/lib/init-action-post.js b/lib/init-action-post.js
index 08c8449012..8b283fbe66 100644
--- a/lib/init-action-post.js
+++ b/lib/init-action-post.js
@@ -129233,6 +129233,11 @@ var DEFAULT_VERSION_FEATURE_FLAG_PREFIX = "default_codeql_version_";
 var DEFAULT_VERSION_FEATURE_FLAG_SUFFIX = "_enabled";
 var CODEQL_VERSION_ZSTD_BUNDLE = "2.19.0";
 var featureConfig = {
+  ["allow_toolcache_input" /* AllowToolcacheInput */]: {
+    defaultValue: false,
+    envVar: "CODEQL_ACTION_ALLOW_TOOLCACHE_INPUT",
+    minimumVersion: void 0
+  },
   ["cleanup_trap_caches" /* CleanupTrapCaches */]: {
     defaultValue: false,
     envVar: "CODEQL_ACTION_CLEANUP_TRAP_CACHES",
@@ -130281,7 +130286,7 @@ async function findOverridingToolsInCache(humanReadableVersion, logger) {
   }
   return void 0;
 }
-async function getCodeQLSource(toolsInput, defaultCliVersion, apiDetails, variant, tarSupportsZstd, logger) {
+async function getCodeQLSource(toolsInput, defaultCliVersion, apiDetails, variant, tarSupportsZstd, features, logger) {
   if (toolsInput && !isReservedToolsValue(toolsInput) && !toolsInput.startsWith("http")) {
     logger.info(`Using CodeQL CLI from local path ${toolsInput}`);
     const compressionMethod2 = inferCompressionMethod(toolsInput);
@@ -130320,7 +130325,10 @@ async function getCodeQLSource(toolsInput, defaultCliVersion, apiDetails, varian
     }
   } else if (toolsInput !== void 0 && toolsInput === CODEQL_TOOLCACHE_INPUT) {
     let latestToolcacheVersion;
-    const allowToolcacheValue = isDynamicWorkflow() || isInTestMode();
+    const allowToolcacheValueFF = await features.getValue(
+      "allow_toolcache_input" /* AllowToolcacheInput */
+    );
+    const allowToolcacheValue = allowToolcacheValueFF && (isDynamicWorkflow() || isInTestMode());
     if (allowToolcacheValue) {
       logger.info(
         `Attempting to use the latest CodeQL CLI version in the toolcache, as requested by 'tools: ${toolsInput}'.`
@@ -130336,9 +130344,15 @@ async function getCodeQLSource(toolsInput, defaultCliVersion, apiDetails, varian
           `Found no CodeQL CLI in the toolcache, ignoring 'tools: ${toolsInput}'...`
         );
       } else {
-        logger.warning(
-          `Ignoring 'tools: ${toolsInput}' because the workflow was not triggered dynamically.`
-        );
+        if (allowToolcacheValueFF) {
+          logger.warning(
+            `Ignoring 'tools: ${toolsInput}' because the workflow was not triggered dynamically.`
+          );
+        } else {
+          logger.info(
+            `Ignoring 'tools: ${toolsInput}' because the feature is not enabled.`
+          );
+        }
       }
       cliVersion2 = defaultCliVersion.cliVersion;
       tagName = defaultCliVersion.tagName;
@@ -130551,7 +130565,7 @@ function getCanonicalToolcacheVersion(cliVersion2, bundleVersion2, logger) {
   }
   return cliVersion2;
 }
-async function setupCodeQLBundle(toolsInput, apiDetails, tempDir, variant, defaultCliVersion, logger) {
+async function setupCodeQLBundle(toolsInput, apiDetails, tempDir, variant, defaultCliVersion, features, logger) {
   if (!await isBinaryAccessible("tar", logger)) {
     throw new ConfigurationError(
       "Could not find tar in PATH, so unable to extract CodeQL bundle."
@@ -130564,6 +130578,7 @@ async function setupCodeQLBundle(toolsInput, apiDetails, tempDir, variant, defau
     apiDetails,
     variant,
     zstdAvailability.available,
+    features,
     logger
   );
   let codeqlFolder;
@@ -130688,7 +130703,7 @@ var GHES_VERSION_MOST_RECENTLY_DEPRECATED = "3.13";
 var GHES_MOST_RECENT_DEPRECATION_DATE = "2025-06-19";
 var EXTRACTION_DEBUG_MODE_VERBOSITY = "progress++";
 var CODEQL_VERSION_CACHE_CLEANUP = "2.17.1";
-async function setupCodeQL(toolsInput, apiDetails, tempDir, variant, defaultCliVersion, logger, checkVersion) {
+async function setupCodeQL(toolsInput, apiDetails, tempDir, variant, defaultCliVersion, features, logger, checkVersion) {
   try {
     const {
       codeqlFolder,
@@ -130702,6 +130717,7 @@ async function setupCodeQL(toolsInput, apiDetails, tempDir, variant, defaultCliV
       tempDir,
       variant,
       defaultCliVersion,
+      features,
       logger
     );
     logger.debug(
@@ -132880,7 +132896,7 @@ async function addFingerprints(sarif, sourceRoot, logger) {
 // src/init.ts
 var toolrunner4 = __toESM(require_toolrunner());
 var io6 = __toESM(require_io());
-async function initCodeQL(toolsInput, apiDetails, tempDir, variant, defaultCliVersion, logger) {
+async function initCodeQL(toolsInput, apiDetails, tempDir, variant, defaultCliVersion, features, logger) {
   logger.startGroup("Setup CodeQL tools");
   const {
     codeql,
@@ -132894,6 +132910,7 @@ async function initCodeQL(toolsInput, apiDetails, tempDir, variant, defaultCliVe
     tempDir,
     variant,
     defaultCliVersion,
+    features,
     logger,
     true
   );
@@ -133040,6 +133057,7 @@ async function combineSarifFilesUsingCLI(sarifFiles, gitHubVersion, features, lo
       tempDir,
       gitHubVersion.type,
       codeQLDefaultVersionInfo,
+      features,
       logger
     );
     codeQL = initCodeQLResult.codeql;
diff --git a/lib/init-action.js b/lib/init-action.js
index 5481ab1e8f..d47e42a785 100644
--- a/lib/init-action.js
+++ b/lib/init-action.js
@@ -86981,6 +86981,11 @@ var DEFAULT_VERSION_FEATURE_FLAG_PREFIX = "default_codeql_version_";
 var DEFAULT_VERSION_FEATURE_FLAG_SUFFIX = "_enabled";
 var CODEQL_VERSION_ZSTD_BUNDLE = "2.19.0";
 var featureConfig = {
+  ["allow_toolcache_input" /* AllowToolcacheInput */]: {
+    defaultValue: false,
+    envVar: "CODEQL_ACTION_ALLOW_TOOLCACHE_INPUT",
+    minimumVersion: void 0
+  },
   ["cleanup_trap_caches" /* CleanupTrapCaches */]: {
     defaultValue: false,
     envVar: "CODEQL_ACTION_CLEANUP_TRAP_CACHES",
@@ -89077,7 +89082,7 @@ async function findOverridingToolsInCache(humanReadableVersion, logger) {
   }
   return void 0;
 }
-async function getCodeQLSource(toolsInput, defaultCliVersion, apiDetails, variant, tarSupportsZstd, logger) {
+async function getCodeQLSource(toolsInput, defaultCliVersion, apiDetails, variant, tarSupportsZstd, features, logger) {
   if (toolsInput && !isReservedToolsValue(toolsInput) && !toolsInput.startsWith("http")) {
     logger.info(`Using CodeQL CLI from local path ${toolsInput}`);
     const compressionMethod2 = inferCompressionMethod(toolsInput);
@@ -89116,7 +89121,10 @@ async function getCodeQLSource(toolsInput, defaultCliVersion, apiDetails, varian
     }
   } else if (toolsInput !== void 0 && toolsInput === CODEQL_TOOLCACHE_INPUT) {
     let latestToolcacheVersion;
-    const allowToolcacheValue = isDynamicWorkflow() || isInTestMode();
+    const allowToolcacheValueFF = await features.getValue(
+      "allow_toolcache_input" /* AllowToolcacheInput */
+    );
+    const allowToolcacheValue = allowToolcacheValueFF && (isDynamicWorkflow() || isInTestMode());
     if (allowToolcacheValue) {
       logger.info(
         `Attempting to use the latest CodeQL CLI version in the toolcache, as requested by 'tools: ${toolsInput}'.`
@@ -89132,9 +89140,15 @@ async function getCodeQLSource(toolsInput, defaultCliVersion, apiDetails, varian
           `Found no CodeQL CLI in the toolcache, ignoring 'tools: ${toolsInput}'...`
         );
       } else {
-        logger.warning(
-          `Ignoring 'tools: ${toolsInput}' because the workflow was not triggered dynamically.`
-        );
+        if (allowToolcacheValueFF) {
+          logger.warning(
+            `Ignoring 'tools: ${toolsInput}' because the workflow was not triggered dynamically.`
+          );
+        } else {
+          logger.info(
+            `Ignoring 'tools: ${toolsInput}' because the feature is not enabled.`
+          );
+        }
       }
       cliVersion2 = defaultCliVersion.cliVersion;
       tagName = defaultCliVersion.tagName;
@@ -89347,7 +89361,7 @@ function getCanonicalToolcacheVersion(cliVersion2, bundleVersion2, logger) {
   }
   return cliVersion2;
 }
-async function setupCodeQLBundle(toolsInput, apiDetails, tempDir, variant, defaultCliVersion, logger) {
+async function setupCodeQLBundle(toolsInput, apiDetails, tempDir, variant, defaultCliVersion, features, logger) {
   if (!await isBinaryAccessible("tar", logger)) {
     throw new ConfigurationError(
       "Could not find tar in PATH, so unable to extract CodeQL bundle."
@@ -89360,6 +89374,7 @@ async function setupCodeQLBundle(toolsInput, apiDetails, tempDir, variant, defau
     apiDetails,
     variant,
     zstdAvailability.available,
+    features,
     logger
   );
   let codeqlFolder;
@@ -89506,7 +89521,7 @@ var GHES_VERSION_MOST_RECENTLY_DEPRECATED = "3.13";
 var GHES_MOST_RECENT_DEPRECATION_DATE = "2025-06-19";
 var EXTRACTION_DEBUG_MODE_VERBOSITY = "progress++";
 var CODEQL_VERSION_CACHE_CLEANUP = "2.17.1";
-async function setupCodeQL(toolsInput, apiDetails, tempDir, variant, defaultCliVersion, logger, checkVersion) {
+async function setupCodeQL(toolsInput, apiDetails, tempDir, variant, defaultCliVersion, features, logger, checkVersion) {
   try {
     const {
       codeqlFolder,
@@ -89520,6 +89535,7 @@ async function setupCodeQL(toolsInput, apiDetails, tempDir, variant, defaultCliV
       tempDir,
       variant,
       defaultCliVersion,
+      features,
       logger
     );
     logger.debug(
@@ -90093,7 +90109,7 @@ async function getJobRunUuidSarifOptions(codeql) {
 }
 
 // src/init.ts
-async function initCodeQL(toolsInput, apiDetails, tempDir, variant, defaultCliVersion, logger) {
+async function initCodeQL(toolsInput, apiDetails, tempDir, variant, defaultCliVersion, features, logger) {
   logger.startGroup("Setup CodeQL tools");
   const {
     codeql,
@@ -90107,6 +90123,7 @@ async function initCodeQL(toolsInput, apiDetails, tempDir, variant, defaultCliVe
     tempDir,
     variant,
     defaultCliVersion,
+    features,
     logger,
     true
   );
@@ -90755,6 +90772,7 @@ async function run() {
       getTemporaryDirectory(),
       gitHubVersion.type,
       codeQLDefaultVersionInfo,
+      features,
       logger
     );
     codeql = initCodeQLResult.codeql;
diff --git a/lib/resolve-environment-action.js b/lib/resolve-environment-action.js
index 4d1cdf81af..8c583694c1 100644
--- a/lib/resolve-environment-action.js
+++ b/lib/resolve-environment-action.js
@@ -78535,6 +78535,11 @@ function isSupportedToolsFeature(versionInfo, feature) {
 
 // src/feature-flags.ts
 var featureConfig = {
+  ["allow_toolcache_input" /* AllowToolcacheInput */]: {
+    defaultValue: false,
+    envVar: "CODEQL_ACTION_ALLOW_TOOLCACHE_INPUT",
+    minimumVersion: void 0
+  },
   ["cleanup_trap_caches" /* CleanupTrapCaches */]: {
     defaultValue: false,
     envVar: "CODEQL_ACTION_CLEANUP_TRAP_CACHES",
diff --git a/lib/start-proxy-action-post.js b/lib/start-proxy-action-post.js
index 2b468746ba..be478338a6 100644
--- a/lib/start-proxy-action-post.js
+++ b/lib/start-proxy-action-post.js
@@ -117215,6 +117215,11 @@ var semver3 = __toESM(require_semver2());
 
 // src/feature-flags.ts
 var featureConfig = {
+  ["allow_toolcache_input" /* AllowToolcacheInput */]: {
+    defaultValue: false,
+    envVar: "CODEQL_ACTION_ALLOW_TOOLCACHE_INPUT",
+    minimumVersion: void 0
+  },
   ["cleanup_trap_caches" /* CleanupTrapCaches */]: {
     defaultValue: false,
     envVar: "CODEQL_ACTION_CLEANUP_TRAP_CACHES",
diff --git a/lib/start-proxy-action.js b/lib/start-proxy-action.js
index 29aea7357a..77de29490a 100644
--- a/lib/start-proxy-action.js
+++ b/lib/start-proxy-action.js
@@ -95329,6 +95329,11 @@ var semver3 = __toESM(require_semver2());
 
 // src/feature-flags.ts
 var featureConfig = {
+  ["allow_toolcache_input" /* AllowToolcacheInput */]: {
+    defaultValue: false,
+    envVar: "CODEQL_ACTION_ALLOW_TOOLCACHE_INPUT",
+    minimumVersion: void 0
+  },
   ["cleanup_trap_caches" /* CleanupTrapCaches */]: {
     defaultValue: false,
     envVar: "CODEQL_ACTION_CLEANUP_TRAP_CACHES",
diff --git a/lib/upload-lib.js b/lib/upload-lib.js
index 508e16a109..65b0566031 100644
--- a/lib/upload-lib.js
+++ b/lib/upload-lib.js
@@ -89332,6 +89332,11 @@ function isSupportedToolsFeature(versionInfo, feature) {
 // src/feature-flags.ts
 var CODEQL_VERSION_ZSTD_BUNDLE = "2.19.0";
 var featureConfig = {
+  ["allow_toolcache_input" /* AllowToolcacheInput */]: {
+    defaultValue: false,
+    envVar: "CODEQL_ACTION_ALLOW_TOOLCACHE_INPUT",
+    minimumVersion: void 0
+  },
   ["cleanup_trap_caches" /* CleanupTrapCaches */]: {
     defaultValue: false,
     envVar: "CODEQL_ACTION_CLEANUP_TRAP_CACHES",
@@ -90116,7 +90121,7 @@ async function findOverridingToolsInCache(humanReadableVersion, logger) {
   }
   return void 0;
 }
-async function getCodeQLSource(toolsInput, defaultCliVersion, apiDetails, variant, tarSupportsZstd, logger) {
+async function getCodeQLSource(toolsInput, defaultCliVersion, apiDetails, variant, tarSupportsZstd, features, logger) {
   if (toolsInput && !isReservedToolsValue(toolsInput) && !toolsInput.startsWith("http")) {
     logger.info(`Using CodeQL CLI from local path ${toolsInput}`);
     const compressionMethod2 = inferCompressionMethod(toolsInput);
@@ -90155,7 +90160,10 @@ async function getCodeQLSource(toolsInput, defaultCliVersion, apiDetails, varian
     }
   } else if (toolsInput !== void 0 && toolsInput === CODEQL_TOOLCACHE_INPUT) {
     let latestToolcacheVersion;
-    const allowToolcacheValue = isDynamicWorkflow() || isInTestMode();
+    const allowToolcacheValueFF = await features.getValue(
+      "allow_toolcache_input" /* AllowToolcacheInput */
+    );
+    const allowToolcacheValue = allowToolcacheValueFF && (isDynamicWorkflow() || isInTestMode());
     if (allowToolcacheValue) {
       logger.info(
         `Attempting to use the latest CodeQL CLI version in the toolcache, as requested by 'tools: ${toolsInput}'.`
@@ -90171,9 +90179,15 @@ async function getCodeQLSource(toolsInput, defaultCliVersion, apiDetails, varian
           `Found no CodeQL CLI in the toolcache, ignoring 'tools: ${toolsInput}'...`
         );
       } else {
-        logger.warning(
-          `Ignoring 'tools: ${toolsInput}' because the workflow was not triggered dynamically.`
-        );
+        if (allowToolcacheValueFF) {
+          logger.warning(
+            `Ignoring 'tools: ${toolsInput}' because the workflow was not triggered dynamically.`
+          );
+        } else {
+          logger.info(
+            `Ignoring 'tools: ${toolsInput}' because the feature is not enabled.`
+          );
+        }
       }
       cliVersion2 = defaultCliVersion.cliVersion;
       tagName = defaultCliVersion.tagName;
@@ -90386,7 +90400,7 @@ function getCanonicalToolcacheVersion(cliVersion2, bundleVersion2, logger) {
   }
   return cliVersion2;
 }
-async function setupCodeQLBundle(toolsInput, apiDetails, tempDir, variant, defaultCliVersion, logger) {
+async function setupCodeQLBundle(toolsInput, apiDetails, tempDir, variant, defaultCliVersion, features, logger) {
   if (!await isBinaryAccessible("tar", logger)) {
     throw new ConfigurationError(
       "Could not find tar in PATH, so unable to extract CodeQL bundle."
@@ -90399,6 +90413,7 @@ async function setupCodeQLBundle(toolsInput, apiDetails, tempDir, variant, defau
     apiDetails,
     variant,
     zstdAvailability.available,
+    features,
     logger
   );
   let codeqlFolder;
@@ -90523,7 +90538,7 @@ var GHES_VERSION_MOST_RECENTLY_DEPRECATED = "3.13";
 var GHES_MOST_RECENT_DEPRECATION_DATE = "2025-06-19";
 var EXTRACTION_DEBUG_MODE_VERBOSITY = "progress++";
 var CODEQL_VERSION_CACHE_CLEANUP = "2.17.1";
-async function setupCodeQL(toolsInput, apiDetails, tempDir, variant, defaultCliVersion, logger, checkVersion) {
+async function setupCodeQL(toolsInput, apiDetails, tempDir, variant, defaultCliVersion, features, logger, checkVersion) {
   try {
     const {
       codeqlFolder,
@@ -90537,6 +90552,7 @@ async function setupCodeQL(toolsInput, apiDetails, tempDir, variant, defaultCliV
       tempDir,
       variant,
       defaultCliVersion,
+      features,
       logger
     );
     logger.debug(
@@ -92240,7 +92256,7 @@ async function addFingerprints(sarif, sourceRoot, logger) {
 // src/init.ts
 var toolrunner4 = __toESM(require_toolrunner());
 var io5 = __toESM(require_io());
-async function initCodeQL(toolsInput, apiDetails, tempDir, variant, defaultCliVersion, logger) {
+async function initCodeQL(toolsInput, apiDetails, tempDir, variant, defaultCliVersion, features, logger) {
   logger.startGroup("Setup CodeQL tools");
   const {
     codeql,
@@ -92254,6 +92270,7 @@ async function initCodeQL(toolsInput, apiDetails, tempDir, variant, defaultCliVe
     tempDir,
     variant,
     defaultCliVersion,
+    features,
     logger,
     true
   );
@@ -92400,6 +92417,7 @@ async function combineSarifFilesUsingCLI(sarifFiles, gitHubVersion, features, lo
       tempDir,
       gitHubVersion.type,
       codeQLDefaultVersionInfo,
+      features,
       logger
     );
     codeQL = initCodeQLResult.codeql;
diff --git a/lib/upload-sarif-action-post.js b/lib/upload-sarif-action-post.js
index 6f9835b144..f4eda54fb3 100644
--- a/lib/upload-sarif-action-post.js
+++ b/lib/upload-sarif-action-post.js
@@ -117378,6 +117378,11 @@ function isSafeArtifactUpload(codeQlVersion) {
 
 // src/feature-flags.ts
 var featureConfig = {
+  ["allow_toolcache_input" /* AllowToolcacheInput */]: {
+    defaultValue: false,
+    envVar: "CODEQL_ACTION_ALLOW_TOOLCACHE_INPUT",
+    minimumVersion: void 0
+  },
   ["cleanup_trap_caches" /* CleanupTrapCaches */]: {
     defaultValue: false,
     envVar: "CODEQL_ACTION_CLEANUP_TRAP_CACHES",
diff --git a/lib/upload-sarif-action.js b/lib/upload-sarif-action.js
index ecdb515e3f..7be0ff8b11 100644
--- a/lib/upload-sarif-action.js
+++ b/lib/upload-sarif-action.js
@@ -89248,6 +89248,11 @@ var DEFAULT_VERSION_FEATURE_FLAG_PREFIX = "default_codeql_version_";
 var DEFAULT_VERSION_FEATURE_FLAG_SUFFIX = "_enabled";
 var CODEQL_VERSION_ZSTD_BUNDLE = "2.19.0";
 var featureConfig = {
+  ["allow_toolcache_input" /* AllowToolcacheInput */]: {
+    defaultValue: false,
+    envVar: "CODEQL_ACTION_ALLOW_TOOLCACHE_INPUT",
+    minimumVersion: void 0
+  },
   ["cleanup_trap_caches" /* CleanupTrapCaches */]: {
     defaultValue: false,
     envVar: "CODEQL_ACTION_CLEANUP_TRAP_CACHES",
@@ -90787,7 +90792,7 @@ async function findOverridingToolsInCache(humanReadableVersion, logger) {
   }
   return void 0;
 }
-async function getCodeQLSource(toolsInput, defaultCliVersion, apiDetails, variant, tarSupportsZstd, logger) {
+async function getCodeQLSource(toolsInput, defaultCliVersion, apiDetails, variant, tarSupportsZstd, features, logger) {
   if (toolsInput && !isReservedToolsValue(toolsInput) && !toolsInput.startsWith("http")) {
     logger.info(`Using CodeQL CLI from local path ${toolsInput}`);
     const compressionMethod2 = inferCompressionMethod(toolsInput);
@@ -90826,7 +90831,10 @@ async function getCodeQLSource(toolsInput, defaultCliVersion, apiDetails, varian
     }
   } else if (toolsInput !== void 0 && toolsInput === CODEQL_TOOLCACHE_INPUT) {
     let latestToolcacheVersion;
-    const allowToolcacheValue = isDynamicWorkflow() || isInTestMode();
+    const allowToolcacheValueFF = await features.getValue(
+      "allow_toolcache_input" /* AllowToolcacheInput */
+    );
+    const allowToolcacheValue = allowToolcacheValueFF && (isDynamicWorkflow() || isInTestMode());
     if (allowToolcacheValue) {
       logger.info(
         `Attempting to use the latest CodeQL CLI version in the toolcache, as requested by 'tools: ${toolsInput}'.`
@@ -90842,9 +90850,15 @@ async function getCodeQLSource(toolsInput, defaultCliVersion, apiDetails, varian
           `Found no CodeQL CLI in the toolcache, ignoring 'tools: ${toolsInput}'...`
         );
       } else {
-        logger.warning(
-          `Ignoring 'tools: ${toolsInput}' because the workflow was not triggered dynamically.`
-        );
+        if (allowToolcacheValueFF) {
+          logger.warning(
+            `Ignoring 'tools: ${toolsInput}' because the workflow was not triggered dynamically.`
+          );
+        } else {
+          logger.info(
+            `Ignoring 'tools: ${toolsInput}' because the feature is not enabled.`
+          );
+        }
       }
       cliVersion2 = defaultCliVersion.cliVersion;
       tagName = defaultCliVersion.tagName;
@@ -91057,7 +91071,7 @@ function getCanonicalToolcacheVersion(cliVersion2, bundleVersion2, logger) {
   }
   return cliVersion2;
 }
-async function setupCodeQLBundle(toolsInput, apiDetails, tempDir, variant, defaultCliVersion, logger) {
+async function setupCodeQLBundle(toolsInput, apiDetails, tempDir, variant, defaultCliVersion, features, logger) {
   if (!await isBinaryAccessible("tar", logger)) {
     throw new ConfigurationError(
       "Could not find tar in PATH, so unable to extract CodeQL bundle."
@@ -91070,6 +91084,7 @@ async function setupCodeQLBundle(toolsInput, apiDetails, tempDir, variant, defau
     apiDetails,
     variant,
     zstdAvailability.available,
+    features,
     logger
   );
   let codeqlFolder;
@@ -91194,7 +91209,7 @@ var GHES_VERSION_MOST_RECENTLY_DEPRECATED = "3.13";
 var GHES_MOST_RECENT_DEPRECATION_DATE = "2025-06-19";
 var EXTRACTION_DEBUG_MODE_VERBOSITY = "progress++";
 var CODEQL_VERSION_CACHE_CLEANUP = "2.17.1";
-async function setupCodeQL(toolsInput, apiDetails, tempDir, variant, defaultCliVersion, logger, checkVersion) {
+async function setupCodeQL(toolsInput, apiDetails, tempDir, variant, defaultCliVersion, features, logger, checkVersion) {
   try {
     const {
       codeqlFolder,
@@ -91208,6 +91223,7 @@ async function setupCodeQL(toolsInput, apiDetails, tempDir, variant, defaultCliV
       tempDir,
       variant,
       defaultCliVersion,
+      features,
       logger
     );
     logger.debug(
@@ -92911,7 +92927,7 @@ async function addFingerprints(sarif, sourceRoot, logger) {
 // src/init.ts
 var toolrunner4 = __toESM(require_toolrunner());
 var io5 = __toESM(require_io());
-async function initCodeQL(toolsInput, apiDetails, tempDir, variant, defaultCliVersion, logger) {
+async function initCodeQL(toolsInput, apiDetails, tempDir, variant, defaultCliVersion, features, logger) {
   logger.startGroup("Setup CodeQL tools");
   const {
     codeql,
@@ -92925,6 +92941,7 @@ async function initCodeQL(toolsInput, apiDetails, tempDir, variant, defaultCliVe
     tempDir,
     variant,
     defaultCliVersion,
+    features,
     logger,
     true
   );
@@ -93071,6 +93088,7 @@ async function combineSarifFilesUsingCLI(sarifFiles, gitHubVersion, features, lo
       tempDir,
       gitHubVersion.type,
       codeQLDefaultVersionInfo,
+      features,
       logger
     );
     codeQL = initCodeQLResult.codeql;
diff --git a/src/codeql.test.ts b/src/codeql.test.ts
index a5422b1e38..24d88069b8 100644
--- a/src/codeql.test.ts
+++ b/src/codeql.test.ts
@@ -74,6 +74,7 @@ async function installIntoToolcache({
     cliVersion !== undefined
       ? { cliVersion, tagName }
       : SAMPLE_DEFAULT_CLI_VERSION,
+    createFeatures([]),
     getRunnerLogger(true),
     false,
   );
@@ -122,6 +123,8 @@ async function stubCodeql(): Promise<codeql.CodeQL> {
 }
 
 test("downloads and caches explicitly requested bundles that aren't in the toolcache", async (t) => {
+  const features = createFeatures([]);
+
   await util.withTmpDir(async (tmpDir) => {
     setupActionsVars(tmpDir, tmpDir);
 
@@ -140,6 +143,7 @@ test("downloads and caches explicitly requested bundles that aren't in the toolc
         tmpDir,
         util.GitHubVariant.DOTCOM,
         SAMPLE_DEFAULT_CLI_VERSION,
+        features,
         getRunnerLogger(true),
         false,
       );
@@ -154,6 +158,8 @@ test("downloads and caches explicitly requested bundles that aren't in the toolc
 });
 
 test("caches semantically versioned bundles using their semantic version number", async (t) => {
+  const features = createFeatures([]);
+
   await util.withTmpDir(async (tmpDir) => {
     setupActionsVars(tmpDir, tmpDir);
     const url = mockBundleDownloadApi({
@@ -166,6 +172,7 @@ test("caches semantically versioned bundles using their semantic version number"
       tmpDir,
       util.GitHubVariant.DOTCOM,
       SAMPLE_DEFAULT_CLI_VERSION,
+      features,
       getRunnerLogger(true),
       false,
     );
@@ -181,6 +188,8 @@ test("caches semantically versioned bundles using their semantic version number"
 });
 
 test("downloads an explicitly requested bundle even if a different version is cached", async (t) => {
+  const features = createFeatures([]);
+
   await util.withTmpDir(async (tmpDir) => {
     setupActionsVars(tmpDir, tmpDir);
 
@@ -199,6 +208,7 @@ test("downloads an explicitly requested bundle even if a different version is ca
       tmpDir,
       util.GitHubVariant.DOTCOM,
       SAMPLE_DEFAULT_CLI_VERSION,
+      features,
       getRunnerLogger(true),
       false,
     );
@@ -227,6 +237,8 @@ for (const {
   expectedToolcacheVersion,
 } of EXPLICITLY_REQUESTED_BUNDLE_TEST_CASES) {
   test(`caches explicitly requested bundle ${tagName} as ${expectedToolcacheVersion}`, async (t) => {
+    const features = createFeatures([]);
+
     await util.withTmpDir(async (tmpDir) => {
       setupActionsVars(tmpDir, tmpDir);
 
@@ -243,6 +255,7 @@ for (const {
         tmpDir,
         util.GitHubVariant.DOTCOM,
         SAMPLE_DEFAULT_CLI_VERSION,
+        features,
         getRunnerLogger(true),
         false,
       );
@@ -266,6 +279,8 @@ for (const toolcacheVersion of [
     `uses tools from toolcache when ${SAMPLE_DEFAULT_CLI_VERSION.cliVersion} is requested and ` +
       `${toolcacheVersion} is installed`,
     async (t) => {
+      const features = createFeatures([]);
+
       await util.withTmpDir(async (tmpDir) => {
         setupActionsVars(tmpDir, tmpDir);
 
@@ -281,6 +296,7 @@ for (const toolcacheVersion of [
           tmpDir,
           util.GitHubVariant.DOTCOM,
           SAMPLE_DEFAULT_CLI_VERSION,
+          features,
           getRunnerLogger(true),
           false,
         );
@@ -295,6 +311,8 @@ for (const toolcacheVersion of [
 }
 
 test(`uses a cached bundle when no tools input is given on GHES`, async (t) => {
+  const features = createFeatures([]);
+
   await util.withTmpDir(async (tmpDir) => {
     setupActionsVars(tmpDir, tmpDir);
 
@@ -313,6 +331,7 @@ test(`uses a cached bundle when no tools input is given on GHES`, async (t) => {
         cliVersion: defaults.cliVersion,
         tagName: defaults.bundleVersion,
       },
+      features,
       getRunnerLogger(true),
       false,
     );
@@ -328,6 +347,8 @@ test(`uses a cached bundle when no tools input is given on GHES`, async (t) => {
 });
 
 test(`downloads bundle if only an unpinned version is cached on GHES`, async (t) => {
+  const features = createFeatures([]);
+
   await util.withTmpDir(async (tmpDir) => {
     setupActionsVars(tmpDir, tmpDir);
 
@@ -349,6 +370,7 @@ test(`downloads bundle if only an unpinned version is cached on GHES`, async (t)
         cliVersion: defaults.cliVersion,
         tagName: defaults.bundleVersion,
       },
+      features,
       getRunnerLogger(true),
       false,
     );
@@ -364,6 +386,8 @@ test(`downloads bundle if only an unpinned version is cached on GHES`, async (t)
 });
 
 test('downloads bundle if "latest" tools specified but not cached', async (t) => {
+  const features = createFeatures([]);
+
   await util.withTmpDir(async (tmpDir) => {
     setupActionsVars(tmpDir, tmpDir);
 
@@ -382,6 +406,7 @@ test('downloads bundle if "latest" tools specified but not cached', async (t) =>
       tmpDir,
       util.GitHubVariant.DOTCOM,
       SAMPLE_DEFAULT_CLI_VERSION,
+      features,
       getRunnerLogger(true),
       false,
     );
@@ -397,6 +422,8 @@ test('downloads bundle if "latest" tools specified but not cached', async (t) =>
 });
 
 test("bundle URL from another repo is cached as 0.0.0-bundleVersion", async (t) => {
+  const features = createFeatures([]);
+
   await util.withTmpDir(async (tmpDir) => {
     setupActionsVars(tmpDir, tmpDir);
 
@@ -417,6 +444,7 @@ test("bundle URL from another repo is cached as 0.0.0-bundleVersion", async (t)
       tmpDir,
       util.GitHubVariant.DOTCOM,
       SAMPLE_DEFAULT_CLI_VERSION,
+      features,
       getRunnerLogger(true),
       false,
     );
diff --git a/src/codeql.ts b/src/codeql.ts
index 5241ff2476..ccb7be08da 100644
--- a/src/codeql.ts
+++ b/src/codeql.ts
@@ -309,6 +309,7 @@ const CODEQL_VERSION_CACHE_CLEANUP = "2.17.1";
  * @param tempDir
  * @param variant
  * @param defaultCliVersion
+ * @param features Information about the features that are enabled.
  * @param logger
  * @param checkVersion Whether to check that CodeQL CLI meets the minimum
  *        version requirement. Must be set to true outside tests.
@@ -320,6 +321,7 @@ export async function setupCodeQL(
   tempDir: string,
   variant: util.GitHubVariant,
   defaultCliVersion: CodeQLDefaultVersionInfo,
+  features: FeatureEnablement,
   logger: Logger,
   checkVersion: boolean,
 ): Promise<{
@@ -342,6 +344,7 @@ export async function setupCodeQL(
       tempDir,
       variant,
       defaultCliVersion,
+      features,
       logger,
     );
 
diff --git a/src/feature-flags.ts b/src/feature-flags.ts
index 2938f5108c..3a548ffa1a 100644
--- a/src/feature-flags.ts
+++ b/src/feature-flags.ts
@@ -43,6 +43,7 @@ export interface FeatureEnablement {
  * Legacy features should end with `_enabled`.
  */
 export enum Feature {
+  AllowToolcacheInput = "allow_toolcache_input",
   CleanupTrapCaches = "cleanup_trap_caches",
   CppDependencyInstallation = "cpp_dependency_installation_enabled",
   DiffInformedQueries = "diff_informed_queries",
@@ -73,9 +74,9 @@ export enum Feature {
   OverlayAnalysisRust = "overlay_analysis_rust",
   OverlayAnalysisSwift = "overlay_analysis_swift",
   PythonDefaultIsToNotExtractStdlib = "python_default_is_to_not_extract_stdlib",
-  UseRepositoryProperties = "use_repository_properties",
   QaTelemetryEnabled = "qa_telemetry_enabled",
   ResolveSupportedLanguagesUsingCli = "resolve_supported_languages_using_cli",
+  UseRepositoryProperties = "use_repository_properties",
 }
 
 export const featureConfig: Record<
@@ -109,6 +110,11 @@ export const featureConfig: Record<
     toolsFeature?: ToolsFeature;
   }
 > = {
+  [Feature.AllowToolcacheInput]: {
+    defaultValue: false,
+    envVar: "CODEQL_ACTION_ALLOW_TOOLCACHE_INPUT",
+    minimumVersion: undefined,
+  },
   [Feature.CleanupTrapCaches]: {
     defaultValue: false,
     envVar: "CODEQL_ACTION_CLEANUP_TRAP_CACHES",
diff --git a/src/init-action.ts b/src/init-action.ts
index 114ad6cab1..0dbe957a76 100644
--- a/src/init-action.ts
+++ b/src/init-action.ts
@@ -248,6 +248,7 @@ async function run() {
       getTemporaryDirectory(),
       gitHubVersion.type,
       codeQLDefaultVersionInfo,
+      features,
       logger,
     );
     codeql = initCodeQLResult.codeql;
diff --git a/src/init.ts b/src/init.ts
index 687afc1227..7ca6a3e39d 100644
--- a/src/init.ts
+++ b/src/init.ts
@@ -9,7 +9,7 @@ import { getOptionalInput, isSelfHostedRunner } from "./actions-util";
 import { GitHubApiDetails } from "./api-client";
 import { CodeQL, setupCodeQL } from "./codeql";
 import * as configUtils from "./config-utils";
-import { CodeQLDefaultVersionInfo } from "./feature-flags";
+import { CodeQLDefaultVersionInfo, FeatureEnablement } from "./feature-flags";
 import { KnownLanguage, Language } from "./languages";
 import { Logger, withGroupAsync } from "./logging";
 import { ToolsSource } from "./setup-codeql";
@@ -23,6 +23,7 @@ export async function initCodeQL(
   tempDir: string,
   variant: util.GitHubVariant,
   defaultCliVersion: CodeQLDefaultVersionInfo,
+  features: FeatureEnablement,
   logger: Logger,
 ): Promise<{
   codeql: CodeQL;
@@ -44,6 +45,7 @@ export async function initCodeQL(
     tempDir,
     variant,
     defaultCliVersion,
+    features,
     logger,
     true,
   );
diff --git a/src/setup-codeql.test.ts b/src/setup-codeql.test.ts
index 4e65c6edf4..3046b6ff56 100644
--- a/src/setup-codeql.test.ts
+++ b/src/setup-codeql.test.ts
@@ -1,7 +1,7 @@
 import * as path from "path";
 
 import * as toolcache from "@actions/tool-cache";
-import test from "ava";
+import test, { ExecutionContext } from "ava";
 import * as sinon from "sinon";
 
 import * as actionsUtil from "./actions-util";
@@ -13,6 +13,7 @@ import {
   LoggedMessage,
   SAMPLE_DEFAULT_CLI_VERSION,
   SAMPLE_DOTCOM_API_DETAILS,
+  createFeatures,
   getRecordingLogger,
   initializeFeatures,
   mockBundleDownloadApi,
@@ -91,6 +92,8 @@ test("getCodeQLActionRepository", (t) => {
 });
 
 test("getCodeQLSource sets CLI version for a semver tagged bundle", async (t) => {
+  const features = createFeatures([]);
+
   await withTmpDir(async (tmpDir) => {
     setupActionsVars(tmpDir, tmpDir);
     const tagName = "codeql-bundle-v1.2.3";
@@ -101,6 +104,7 @@ test("getCodeQLSource sets CLI version for a semver tagged bundle", async (t) =>
       SAMPLE_DOTCOM_API_DETAILS,
       GitHubVariant.DOTCOM,
       false,
+      features,
       getRunnerLogger(true),
     );
 
@@ -110,6 +114,8 @@ test("getCodeQLSource sets CLI version for a semver tagged bundle", async (t) =>
 });
 
 test("getCodeQLSource correctly returns bundled CLI version when tools == linked", async (t) => {
+  const features = createFeatures([]);
+
   await withTmpDir(async (tmpDir) => {
     setupActionsVars(tmpDir, tmpDir);
     const source = await setupCodeql.getCodeQLSource(
@@ -118,6 +124,7 @@ test("getCodeQLSource correctly returns bundled CLI version when tools == linked
       SAMPLE_DOTCOM_API_DETAILS,
       GitHubVariant.DOTCOM,
       false,
+      features,
       getRunnerLogger(true),
     );
 
@@ -129,6 +136,7 @@ test("getCodeQLSource correctly returns bundled CLI version when tools == linked
 test("getCodeQLSource correctly returns bundled CLI version when tools == latest", async (t) => {
   const loggedMessages: LoggedMessage[] = [];
   const logger = getRecordingLogger(loggedMessages);
+  const features = createFeatures([]);
 
   await withTmpDir(async (tmpDir) => {
     setupActionsVars(tmpDir, tmpDir);
@@ -138,6 +146,7 @@ test("getCodeQLSource correctly returns bundled CLI version when tools == latest
       SAMPLE_DOTCOM_API_DETAILS,
       GitHubVariant.DOTCOM,
       false,
+      features,
       logger,
     );
 
@@ -162,6 +171,7 @@ test("getCodeQLSource correctly returns bundled CLI version when tools == latest
 test("setupCodeQLBundle logs the CodeQL CLI version being used when asked to use linked tools", async (t) => {
   const loggedMessages: LoggedMessage[] = [];
   const logger = getRecordingLogger(loggedMessages);
+  const features = createFeatures([]);
 
   // Stub the downloadCodeQL function to prevent downloading artefacts
   // during testing from being called.
@@ -186,6 +196,7 @@ test("setupCodeQLBundle logs the CodeQL CLI version being used when asked to use
       "tmp/codeql_action_test/",
       GitHubVariant.DOTCOM,
       SAMPLE_DEFAULT_CLI_VERSION,
+      features,
       logger,
     );
 
@@ -208,6 +219,7 @@ test("setupCodeQLBundle logs the CodeQL CLI version being used when asked to use
 test("setupCodeQLBundle logs the CodeQL CLI version being used when asked to download a non-default bundle", async (t) => {
   const loggedMessages: LoggedMessage[] = [];
   const logger = getRecordingLogger(loggedMessages);
+  const features = createFeatures([]);
 
   const bundleUrl =
     "https://github.com/github/codeql-action/releases/download/codeql-bundle-v2.16.0/codeql-bundle-linux64.tar.gz";
@@ -236,6 +248,7 @@ test("setupCodeQLBundle logs the CodeQL CLI version being used when asked to dow
       "tmp/codeql_action_test/",
       GitHubVariant.DOTCOM,
       SAMPLE_DEFAULT_CLI_VERSION,
+      features,
       logger,
     );
 
@@ -258,6 +271,7 @@ test("setupCodeQLBundle logs the CodeQL CLI version being used when asked to dow
 test("getCodeQLSource correctly returns latest version from toolcache when tools == toolcache", async (t) => {
   const loggedMessages: LoggedMessage[] = [];
   const logger = getRecordingLogger(loggedMessages);
+  const features = createFeatures([Feature.AllowToolcacheInput]);
 
   process.env["GITHUB_EVENT_NAME"] = "dynamic";
 
@@ -280,6 +294,7 @@ test("getCodeQLSource correctly returns latest version from toolcache when tools
       SAMPLE_DOTCOM_API_DETAILS,
       GitHubVariant.DOTCOM,
       false,
+      features,
       logger,
     );
 
@@ -310,62 +325,103 @@ test("getCodeQLSource correctly returns latest version from toolcache when tools
             typeof msg.message === "string" &&
             msg.message.includes(expectedMessage),
         ),
-        `Expected '${expectedMessage}' in the logger output, but didn't find it.`,
+        `Expected '${expectedMessage}' in the logger output, but didn't find it in:\n ${loggedMessages.map((m) => ` - '${m.message}'`).join("\n")}`,
       );
     }
   });
 });
 
-test("getCodeQLSource falls back to downloading the CLI if the toolcache doesn't have a CodeQL CLI when tools == toolcache", async (t) => {
-  const loggedMessages: LoggedMessage[] = [];
-  const logger = getRecordingLogger(loggedMessages);
-
-  process.env["GITHUB_EVENT_NAME"] = "dynamic";
-
-  const testVersions = [];
-  const findAllVersionsStub = sinon
-    .stub(toolcache, "findAllVersions")
-    .returns(testVersions);
-
-  await withTmpDir(async (tmpDir) => {
-    setupActionsVars(tmpDir, tmpDir);
-    const source = await setupCodeql.getCodeQLSource(
-      "toolcache",
-      SAMPLE_DEFAULT_CLI_VERSION,
-      SAMPLE_DOTCOM_API_DETAILS,
-      GitHubVariant.DOTCOM,
-      false,
-      logger,
-    );
-
-    // Check that the toolcache functions were called with the expected arguments
-    t.assert(
-      findAllVersionsStub.calledWith("CodeQL"),
-      `toolcache.findAllVersions("CodeQL") wasn't called`,
-    );
+const toolcacheInputFallbackMacro = test.macro({
+  exec: async (
+    t: ExecutionContext<unknown>,
+    featureList: Feature[],
+    environment: Record<string, string>,
+    testVersions: string[],
+    expectedMessages: string[],
+  ) => {
+    const loggedMessages: LoggedMessage[] = [];
+    const logger = getRecordingLogger(loggedMessages);
+    const features = createFeatures(featureList);
+
+    for (const [k, v] of Object.entries(environment)) {
+      process.env[k] = v;
+    }
 
-    // Check that `sourceType` and `toolsVersion` match expectations.
-    t.is(source.sourceType, "download");
-    t.is(source.toolsVersion, SAMPLE_DEFAULT_CLI_VERSION.cliVersion);
+    const findAllVersionsStub = sinon
+      .stub(toolcache, "findAllVersions")
+      .returns(testVersions);
+
+    await withTmpDir(async (tmpDir) => {
+      setupActionsVars(tmpDir, tmpDir);
+      const source = await setupCodeql.getCodeQLSource(
+        "toolcache",
+        SAMPLE_DEFAULT_CLI_VERSION,
+        SAMPLE_DOTCOM_API_DETAILS,
+        GitHubVariant.DOTCOM,
+        false,
+        features,
+        logger,
+      );
 
-    // Check that key messages we would expect to find in the log are present.
-    const expectedMessages: string[] = [
-      `Attempting to use the latest CodeQL CLI version in the toolcache, as requested by 'tools: toolcache'.`,
-      `Found no CodeQL CLI in the toolcache, ignoring 'tools: toolcache'...`,
-    ];
-    for (const expectedMessage of expectedMessages) {
+      // Check that the toolcache functions were called with the expected arguments
       t.assert(
-        loggedMessages.some(
-          (msg) =>
-            typeof msg.message === "string" &&
-            msg.message.includes(expectedMessage),
-        ),
-        `Expected '${expectedMessage}' in the logger output, but didn't find it.`,
+        findAllVersionsStub.calledWith("CodeQL"),
+        `toolcache.findAllVersions("CodeQL") wasn't called`,
       );
-    }
-  });
+
+      // Check that `sourceType` and `toolsVersion` match expectations.
+      t.is(source.sourceType, "download");
+      t.is(source.toolsVersion, SAMPLE_DEFAULT_CLI_VERSION.cliVersion);
+
+      // Check that key messages we would expect to find in the log are present.
+      for (const expectedMessage of expectedMessages) {
+        t.assert(
+          loggedMessages.some(
+            (msg) =>
+              typeof msg.message === "string" &&
+              msg.message.includes(expectedMessage),
+          ),
+          `Expected '${expectedMessage}' in the logger output, but didn't find it in:\n ${loggedMessages.map((m) => ` - '${m.message}'`).join("\n")}`,
+        );
+      }
+    });
+  },
+  title: (providedTitle = "") =>
+    `getCodeQLSource falls back to downloading the CLI if ${providedTitle}`,
 });
 
+test(
+  "the toolcache doesn't have a CodeQL CLI when tools == toolcache",
+  toolcacheInputFallbackMacro,
+  [Feature.AllowToolcacheInput],
+  { GITHUB_EVENT_NAME: "dynamic" },
+  [],
+  [
+    `Attempting to use the latest CodeQL CLI version in the toolcache, as requested by 'tools: toolcache'.`,
+    `Found no CodeQL CLI in the toolcache, ignoring 'tools: toolcache'...`,
+  ],
+);
+
+test(
+  "the workflow trigger is not `dynamic`",
+  toolcacheInputFallbackMacro,
+  [Feature.AllowToolcacheInput],
+  { GITHUB_EVENT_NAME: "pull_request" },
+  [],
+  [
+    `Ignoring 'tools: toolcache' because the workflow was not triggered dynamically.`,
+  ],
+);
+
+test(
+  "the feature flag is not enabled",
+  toolcacheInputFallbackMacro,
+  [],
+  { GITHUB_EVENT_NAME: "dynamic" },
+  [],
+  [`Ignoring 'tools: toolcache' because the feature is not enabled.`],
+);
+
 test('tryGetTagNameFromUrl extracts the right tag name for a repo name containing "codeql-bundle"', (t) => {
   t.is(
     setupCodeql.tryGetTagNameFromUrl(
diff --git a/src/setup-codeql.ts b/src/setup-codeql.ts
index e01037223a..9ee0c4b82a 100644
--- a/src/setup-codeql.ts
+++ b/src/setup-codeql.ts
@@ -13,6 +13,8 @@ import * as defaults from "./defaults.json";
 import {
   CODEQL_VERSION_ZSTD_BUNDLE,
   CodeQLDefaultVersionInfo,
+  Feature,
+  FeatureEnablement,
 } from "./feature-flags";
 import { Logger } from "./logging";
 import * as tar from "./tar";
@@ -276,6 +278,7 @@ export async function getCodeQLSource(
   apiDetails: api.GitHubApiDetails,
   variant: util.GitHubVariant,
   tarSupportsZstd: boolean,
+  features: FeatureEnablement,
   logger: Logger,
 ): Promise<CodeQLToolsSource> {
   if (
@@ -356,7 +359,11 @@ export async function getCodeQLSource(
     // We only allow `toolsInput === "toolcache"` for `dynamic` events. In general, using `toolsInput === "toolcache"`
     // can lead to alert wobble and so it shouldn't be used for an analysis where results are intended to be uploaded.
     // We also allow this in test mode.
-    const allowToolcacheValue = isDynamicWorkflow() || util.isInTestMode();
+    const allowToolcacheValueFF = await features.getValue(
+      Feature.AllowToolcacheInput,
+    );
+    const allowToolcacheValue =
+      allowToolcacheValueFF && (isDynamicWorkflow() || util.isInTestMode());
     if (allowToolcacheValue) {
       // If `toolsInput === "toolcache"`, try to find the latest version of the CLI that's available in the toolcache
       // and use that. We perform this check here since we can set `cliVersion` directly and don't want to default to
@@ -377,9 +384,15 @@ export async function getCodeQLSource(
           `Found no CodeQL CLI in the toolcache, ignoring 'tools: ${toolsInput}'...`,
         );
       } else {
-        logger.warning(
-          `Ignoring 'tools: ${toolsInput}' because the workflow was not triggered dynamically.`,
-        );
+        if (allowToolcacheValueFF) {
+          logger.warning(
+            `Ignoring 'tools: ${toolsInput}' because the workflow was not triggered dynamically.`,
+          );
+        } else {
+          logger.info(
+            `Ignoring 'tools: ${toolsInput}' because the feature is not enabled.`,
+          );
+        }
       }
 
       cliVersion = defaultCliVersion.cliVersion;
@@ -735,6 +748,7 @@ export async function setupCodeQLBundle(
   tempDir: string,
   variant: util.GitHubVariant,
   defaultCliVersion: CodeQLDefaultVersionInfo,
+  features: FeatureEnablement,
   logger: Logger,
 ) {
   if (!(await util.isBinaryAccessible("tar", logger))) {
@@ -750,6 +764,7 @@ export async function setupCodeQLBundle(
     apiDetails,
     variant,
     zstdAvailability.available,
+    features,
     logger,
   );
 
diff --git a/src/upload-lib.ts b/src/upload-lib.ts
index 90f0342de5..26ae88f32f 100644
--- a/src/upload-lib.ts
+++ b/src/upload-lib.ts
@@ -262,6 +262,7 @@ async function combineSarifFilesUsingCLI(
       tempDir,
       gitHubVersion.type,
       codeQLDefaultVersionInfo,
+      features,
       logger,
     );