diff --git a/package-lock.json b/package-lock.json
index 98659d9d..f8d86987 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -91,6 +91,7 @@
         "rollup-plugin-copy": "^3.5.0",
         "rollup-plugin-dts": "^6.4.1",
         "semantic-release": "25.0.3",
+        "ts-morph": "^28.0.0",
         "tsx": "^4.21.0",
         "type-fest": "^5.5.0",
         "typescript": "^5.9.3",
@@ -4265,6 +4266,57 @@
         "node": ">= 10"
       }
     },
+    "node_modules/@ts-morph/common": {
+      "version": "0.29.0",
+      "resolved": "https://registry.npmjs.org/@ts-morph/common/-/common-0.29.0.tgz",
+      "integrity": "sha512-35oUmphHbJvQ/+UTwFNme/t2p3FoKiGJ5auTjjpNTop2dyREspirjMy82PLSC1pnDJ8ah1GU98hwpVt64YXQsg==",
+      "dev": true,
+      "license": "MIT",
+      "dependencies": {
+        "minimatch": "^10.0.1",
+        "path-browserify": "^1.0.1",
+        "tinyglobby": "^0.2.14"
+      }
+    },
+    "node_modules/@ts-morph/common/node_modules/balanced-match": {
+      "version": "4.0.4",
+      "resolved": "https://registry.npmjs.org/balanced-match/-/balanced-match-4.0.4.tgz",
+      "integrity": "sha512-BLrgEcRTwX2o6gGxGOCNyMvGSp35YofuYzw9h1IMTRmKqttAZZVU67bdb9Pr2vUHA8+j3i2tJfjO6C6+4myGTA==",
+      "dev": true,
+      "license": "MIT",
+      "engines": {
+        "node": "18 || 20 || >=22"
+      }
+    },
+    "node_modules/@ts-morph/common/node_modules/brace-expansion": {
+      "version": "5.0.5",
+      "resolved": "https://registry.npmjs.org/brace-expansion/-/brace-expansion-5.0.5.tgz",
+      "integrity": "sha512-VZznLgtwhn+Mact9tfiwx64fA9erHH/MCXEUfB/0bX/6Fz6ny5EGTXYltMocqg4xFAQZtnO3DHWWXi8RiuN7cQ==",
+      "dev": true,
+      "license": "MIT",
+      "dependencies": {
+        "balanced-match": "^4.0.2"
+      },
+      "engines": {
+        "node": "18 || 20 || >=22"
+      }
+    },
+    "node_modules/@ts-morph/common/node_modules/minimatch": {
+      "version": "10.2.5",
+      "resolved": "https://registry.npmjs.org/minimatch/-/minimatch-10.2.5.tgz",
+      "integrity": "sha512-MULkVLfKGYDFYejP07QOurDLLQpcjk7Fw+7jXS2R2czRQzR56yHRveU5NDJEOviH+hETZKSkIk5c+T23GjFUMg==",
+      "dev": true,
+      "license": "BlueOak-1.0.0",
+      "dependencies": {
+        "brace-expansion": "^5.0.5"
+      },
+      "engines": {
+        "node": "18 || 20 || >=22"
+      },
+      "funding": {
+        "url": "https://github.com/sponsors/isaacs"
+      }
+    },
     "node_modules/@types/conventional-commits-parser": {
       "version": "5.0.2",
       "resolved": "https://registry.npmjs.org/@types/conventional-commits-parser/-/conventional-commits-parser-5.0.2.tgz",
@@ -5661,6 +5713,13 @@
         "url": "https://github.com/chalk/strip-ansi?sponsor=1"
       }
     },
+    "node_modules/code-block-writer": {
+      "version": "13.0.3",
+      "resolved": "https://registry.npmjs.org/code-block-writer/-/code-block-writer-13.0.3.tgz",
+      "integrity": "sha512-Oofo0pq3IKnsFtuHqSF7TqBfr71aeyZDVJ0HpmqB7FBM2qEigL0iPONSCZSO9pE9dZTAxANe5XHG9Uy0YMv8cg==",
+      "dev": true,
+      "license": "MIT"
+    },
     "node_modules/color-convert": {
       "version": "2.0.1",
       "resolved": "https://registry.npmjs.org/color-convert/-/color-convert-2.0.1.tgz",
@@ -11358,6 +11417,13 @@
         "node": ">=10"
       }
     },
+    "node_modules/path-browserify": {
+      "version": "1.0.1",
+      "resolved": "https://registry.npmjs.org/path-browserify/-/path-browserify-1.0.1.tgz",
+      "integrity": "sha512-b7uo2UCUOYZcnF/3ID0lulOJi/bafxa1xPe7ZPsammBSpjSWQkjNxlt635YGS2MiR9GjvuXCtz2emr3jbsz98g==",
+      "dev": true,
+      "license": "MIT"
+    },
     "node_modules/path-is-absolute": {
       "version": "1.0.1",
       "resolved": "https://registry.npmjs.org/path-is-absolute/-/path-is-absolute-1.0.1.tgz",
@@ -13200,6 +13266,17 @@
         "typescript": ">=4.8.4"
       }
     },
+    "node_modules/ts-morph": {
+      "version": "28.0.0",
+      "resolved": "https://registry.npmjs.org/ts-morph/-/ts-morph-28.0.0.tgz",
+      "integrity": "sha512-Wp3tnZ2bzwxyTZMtgWVzXDfm7lB1Drz+y9DmmYH/L702PQhPyVrp3pkou3yIz4qjS14GY9kcpmLiOOMvl8oG1g==",
+      "dev": true,
+      "license": "MIT",
+      "dependencies": {
+        "@ts-morph/common": "~0.29.0",
+        "code-block-writer": "^13.0.3"
+      }
+    },
     "node_modules/tslib": {
       "version": "2.8.1",
       "resolved": "https://registry.npmjs.org/tslib/-/tslib-2.8.1.tgz",
diff --git a/package.json b/package.json
index 78e2030a..aae59641 100644
--- a/package.json
+++ b/package.json
@@ -15,7 +15,7 @@
   },
   "type": "module",
   "scripts": {
-    "build": "npm run clean && npm run lint && npm run compile && npm run compile-rollup-plugins && npm run compile-default-extensions && npm run compile-language-packs && npm run compile-monaco-languages",
+    "build": "npm run clean && npm run lint && npm run check-unsupported-decorator && npm run compile && npm run compile-rollup-plugins && npm run compile-default-extensions && npm run compile-language-packs && npm run compile-monaco-languages",
     "compile": "NODE_OPTIONS=--max_old_space_size=16384 rollup --config rollup/rollup.config.ts --configPlugin 'typescript={tsconfig: `tsconfig.rollup-config.json`}' --vscode-version ${npm_package_config_vscode_version} --vscode-ref ${npm_package_config_vscode_ref} --vscode-commit ${npm_package_config_vscode_commit}",
     "compile-default-extensions": "NODE_OPTIONS=--max_old_space_size=16384 rollup --config rollup/rollup.default-extensions.ts --configPlugin 'typescript={tsconfig: `tsconfig.rollup-config-default-extensions.json`}'",
     "compile-language-packs": "NODE_OPTIONS=--max_old_space_size=16384 rollup --config rollup/rollup.language-packs.ts --configPlugin 'typescript={tsconfig: `tsconfig.rollup-config-language-packs.json`}'",
@@ -26,7 +26,8 @@
     "lint": "eslint '{src/**/*.ts,rollup/*.ts,*.ts}'",
     "update-vscode-dependencies": "tsx scripts/update-vscode-dependencies.ts",
     "release": "tsx release.ts",
-    "reset:repo": "git clean -f -X -d"
+    "reset:repo": "git clean -f -X -d",
+    "check-unsupported-decorator": "tsx scripts/check-unsupported-decorator.ts"
   },
   "config": {
     "vscode": {
@@ -80,6 +81,7 @@
     "rollup-plugin-copy": "^3.5.0",
     "rollup-plugin-dts": "^6.4.1",
     "semantic-release": "25.0.3",
+    "ts-morph": "^28.0.0",
     "tsx": "^4.21.0",
     "type-fest": "^5.5.0",
     "typescript": "^5.9.3",
diff --git a/scripts/check-unsupported-decorator.ts b/scripts/check-unsupported-decorator.ts
new file mode 100644
index 00000000..2c435cdb
--- /dev/null
+++ b/scripts/check-unsupported-decorator.ts
@@ -0,0 +1,29 @@
+import { Project } from 'ts-morph'
+
+const project = new Project({ tsConfigFilePath: 'tsconfig.json' })
+const sourceFile = project.getSourceFileOrThrow('src/missing-services.ts')
+
+const issues: string[] = []
+
+for (const cls of sourceFile.getClasses()) {
+  for (const prop of cls.getProperties()) {
+    const initText = prop.getInitializer()?.getText().trim()
+    const usesUnsupported = initText === 'unsupported'
+    const hasDecorator = prop.getDecorator('Unsupported') != null
+
+    const loc = `${cls.getName()}.${prop.getName()} (line ${prop.getStartLineNumber()})`
+
+    if (usesUnsupported && !hasDecorator) {
+      issues.push(`❌ ${loc}: uses \`unsupported\` but is missing the @Unsupported decorator`)
+    }
+    if (!usesUnsupported && hasDecorator) {
+      issues.push(`❌ ${loc}: has @Unsupported decorator but does not use \`unsupported\``)
+    }
+  }
+}
+
+if (issues.length) {
+  console.error(issues.join('\n'))
+  process.exit(1)
+}
+console.log('✅ All consistent')
\ No newline at end of file
diff --git a/src/missing-services.ts b/src/missing-services.ts
index 5252e162..3d606268 100644
--- a/src/missing-services.ts
+++ b/src/missing-services.ts
@@ -2066,11 +2066,8 @@ class ExtensionsScannerService implements IExtensionsScannerService {
     return unsupported()
   }
   onDidChangeCache: IExtensionsScannerService['onDidChangeCache'] = Event.None
-  @Unsupported
   scanAllExtensions: IExtensionsScannerService['scanAllExtensions'] = async () => []
-  @Unsupported
   scanSystemExtensions: IExtensionsScannerService['scanSystemExtensions'] = async () => []
-  @Unsupported
   scanUserExtensions: IExtensionsScannerService['scanUserExtensions'] = async () => []
   @Unsupported
   scanExtensionsUnderDevelopment: IExtensionsScannerService['scanExtensionsUnderDevelopment'] =
@@ -2725,7 +2722,6 @@ class TerminalService implements ITerminalService {
   createTerminal: ITerminalService['createTerminal'] = unsupported
   @Unsupported
   getInstanceFromId: ITerminalService['getInstanceFromId'] = unsupported
-  @Unsupported
   getReconnectedTerminals: ITerminalService['getReconnectedTerminals'] = () => undefined
   @Unsupported
   getActiveOrCreateInstance: ITerminalService['getActiveOrCreateInstance'] = unsupported
@@ -4100,7 +4096,6 @@ class AuthenticationService implements IAuthenticationService {
   getProviderIds: IAuthenticationService['getProviderIds'] = () => []
   @Unsupported
   getProvider: IAuthenticationService['getProvider'] = unsupported
-  @Unsupported
   getSessions: IAuthenticationService['getSessions'] = async () => []
   @Unsupported
   createSession: IAuthenticationService['createSession'] = unsupported
@@ -5669,7 +5664,6 @@ class McpRegistry implements IMcpRegistry {
   }
   @Unsupported
   setSavedInput: IMcpRegistry['setSavedInput'] = unsupported
-  @Unsupported
   getServerDefinition: IMcpRegistry['getServerDefinition'] = () =>
     constObservable({
       server: undefined,
@@ -5740,7 +5734,6 @@ class NullDefaultAccountService extends Disposable implements IDefaultAccountSer
   @Unsupported
   getDefaultAccountAuthenticationProvider: IDefaultAccountService['getDefaultAccountAuthenticationProvider'] =
     unsupported
-  @Unsupported
   setDefaultAccountProvider: IDefaultAccountService['setDefaultAccountProvider'] = () => {}
   refresh: IDefaultAccountService['refresh'] = async () => null
   @Unsupported
@@ -6946,6 +6939,7 @@ registerSingleton(IInlineChatHistoryService, InlineChatHistoryService, Instantia
 class BrowserViewWorkbenchService implements IBrowserViewWorkbenchService {
   _serviceBrand: undefined
 
+  @Unsupported
   getOrCreateBrowserViewModel: IBrowserViewWorkbenchService['getOrCreateBrowserViewModel'] =
     unsupported
   @Unsupported