diff --git a/.changeset/fuzzy-tables-build.md b/.changeset/fuzzy-tables-build.md
new file mode 100644
index 0000000000..11c5ea323f
--- /dev/null
+++ b/.changeset/fuzzy-tables-build.md
@@ -0,0 +1,5 @@
+---
+'astro': minor
+---
+
+Remove experimental flag for custom client directives
diff --git a/examples/middleware/astro.config.mjs b/examples/middleware/astro.config.mjs
index 1d4662423e..68ba7fac58 100644
--- a/examples/middleware/astro.config.mjs
+++ b/examples/middleware/astro.config.mjs
@@ -7,7 +7,4 @@ export default defineConfig({
 	adapter: node({
 		mode: 'standalone',
 	}),
-	experimental: {
-		middleware: true,
-	},
 });
diff --git a/packages/astro/e2e/fixtures/custom-client-directives/astro.config.mjs b/packages/astro/e2e/fixtures/custom-client-directives/astro.config.mjs
index 451c7ddd8a..4f32edd6f1 100644
--- a/packages/astro/e2e/fixtures/custom-client-directives/astro.config.mjs
+++ b/packages/astro/e2e/fixtures/custom-client-directives/astro.config.mjs
@@ -4,9 +4,6 @@ import { fileURLToPath } from 'url';
 
 export default defineConfig({
   integrations: [astroClientClickDirective(), astroClientPasswordDirective(), react()],
-  experimental: {
-    customClientDirectives: true
-  }
 });
 
 function astroClientClickDirective() {
diff --git a/packages/astro/src/@types/astro.ts b/packages/astro/src/@types/astro.ts
index b8122f6bda..aa2b5706b0 100644
--- a/packages/astro/src/@types/astro.ts
+++ b/packages/astro/src/@types/astro.ts
@@ -1166,28 +1166,6 @@ export interface AstroUserConfig {
 		 */
 		assets?: boolean;
 
-		/**
-		 * @docs
-		 * @name experimental.customClientDirectives
-		 * @type {boolean}
-		 * @default `false`
-		 * @version 2.5.0
-		 * @description
-		 * Allow integrations to use the [experimental `addClientDirective` API](/en/reference/integrations-reference/#addclientdirective-option) in the `astro:config:setup` hook
-		 * to add custom client directives in Astro files.
-		 *
-		 * To enable this feature, set `experimental.customClientDirectives` to `true` in your Astro config:
-		 *
-		 * ```js
-		 * {
-		 * 	experimental: {
-		 *		customClientDirectives: true,
-		 * 	},
-		 * }
-		 * ```
-		 */
-		customClientDirectives?: boolean;
-
 		/**
 		 * @docs
 		 * @name experimental.hybridOutput
diff --git a/packages/astro/src/core/config/schema.ts b/packages/astro/src/core/config/schema.ts
index d40f2c28ba..0610af5c63 100644
--- a/packages/astro/src/core/config/schema.ts
+++ b/packages/astro/src/core/config/schema.ts
@@ -43,8 +43,6 @@ const ASTRO_CONFIG_DEFAULTS: AstroUserConfig & any = {
 	experimental: {
 		assets: false,
 		hybridOutput: false,
-		customClientDirectives: false,
-		middleware: false,
 		redirects: false,
 	},
 };
@@ -208,10 +206,6 @@ export const AstroConfigSchema = z.object({
 	experimental: z
 		.object({
 			assets: z.boolean().optional().default(ASTRO_CONFIG_DEFAULTS.experimental.assets),
-			customClientDirectives: z
-				.boolean()
-				.optional()
-				.default(ASTRO_CONFIG_DEFAULTS.experimental.customClientDirecives),
 			hybridOutput: z.boolean().optional().default(ASTRO_CONFIG_DEFAULTS.experimental.hybridOutput),
 			redirects: z.boolean().optional().default(ASTRO_CONFIG_DEFAULTS.experimental.redirects),
 		})
diff --git a/packages/astro/src/integrations/index.ts b/packages/astro/src/integrations/index.ts
index 5d88a1196b..1bc69acc8c 100644
--- a/packages/astro/src/integrations/index.ts
+++ b/packages/astro/src/integrations/index.ts
@@ -102,11 +102,6 @@ export async function runHookConfigSetup({
 					updatedSettings.watchFiles.push(path instanceof URL ? fileURLToPath(path) : path);
 				},
 				addClientDirective: ({ name, entrypoint }) => {
-					if (!settings.config.experimental.customClientDirectives) {
-						throw new Error(
-							`The "${integration.name}" integration is trying to add the "${name}" client directive, but the \`experimental.customClientDirectives\` config is not enabled.`
-						);
-					}
 					if (updatedSettings.clientDirectives.has(name) || addedClientDirectives.has(name)) {
 						throw new Error(
 							`The "${integration.name}" integration is trying to add the "${name}" client directive, but it already exists.`
diff --git a/packages/astro/test/fixtures/middleware-dev/astro.config.mjs b/packages/astro/test/fixtures/middleware-dev/astro.config.mjs
deleted file mode 100644
index 4379be246f..0000000000
--- a/packages/astro/test/fixtures/middleware-dev/astro.config.mjs
+++ /dev/null
@@ -1,7 +0,0 @@
-import { defineConfig } from 'astro/config';
-
-export default defineConfig({
-	experimental: {
-		middleware: true
-	}
-});
diff --git a/packages/astro/test/fixtures/middleware-ssg/astro.config.mjs b/packages/astro/test/fixtures/middleware-ssg/astro.config.mjs
index 2f2e911a8d..a8ce50d378 100644
--- a/packages/astro/test/fixtures/middleware-ssg/astro.config.mjs
+++ b/packages/astro/test/fixtures/middleware-ssg/astro.config.mjs
@@ -2,7 +2,4 @@ import { defineConfig } from 'astro/config';
 
 export default defineConfig({
 	output: "static",
-	experimental: {
-		middleware: true
-	}
 });
diff --git a/packages/astro/test/fixtures/middleware-tailwind/astro.config.mjs b/packages/astro/test/fixtures/middleware-tailwind/astro.config.mjs
index e6b93533dd..db58bbf858 100644
--- a/packages/astro/test/fixtures/middleware-tailwind/astro.config.mjs
+++ b/packages/astro/test/fixtures/middleware-tailwind/astro.config.mjs
@@ -5,7 +5,4 @@ import tailwind from '@astrojs/tailwind';
 // https://astro.build/config
 export default defineConfig({
 	integrations: [tailwind()],
-	experimental: {
-		middleware: true,
-	}
 });
diff --git a/packages/astro/test/redirects.test.js b/packages/astro/test/redirects.test.js
index e1891e5f35..5cff8fe3d9 100644
--- a/packages/astro/test/redirects.test.js
+++ b/packages/astro/test/redirects.test.js
@@ -71,7 +71,6 @@ describe('Astro.redirect', () => {
 				root: './fixtures/ssr-redirect/',
 				output: 'static',
 				experimental: {
-					middleware: true,
 					redirects: true,
 				},
 				redirects: {