diff --git a/CHANGELOG.md b/CHANGELOG.md
index 5aa6b6535..ccc4c9010 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -23,6 +23,7 @@ The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/).
 
 ### Changed
 
+* `window.fdc3` is now an optional property and may or may not be defined. Applications should now use `getAgent()` as the recommended way of retrieving a reference to the FDC3 API. ([#1386](https://github.com/finos/FDC3/pull/1386))
 * `Listener.unsubscribe()` was made async (the return type was changed from `void` to `Promise<void>`) for consistency with the rest of the API. ([#1305](https://github.com/finos/FDC3/pull/1305))
 * Added reference materials and supported platforms information for FDC3 in .NET via the [finos/fdc3-dotnet](https://github.com/finos/fdc3-dotnet) project. ([#1108](https://github.com/finos/FDC3/pull/1108))
 * The supported platforms page in the FDC3 documentation was moved into the API section as the information it provides all relates to FDC3 Desktop Agent API implementations. ([#1108](https://github.com/finos/FDC3/pull/1108))
diff --git a/src/api/DesktopAgent.ts b/src/api/DesktopAgent.ts
index 8d9edbdd9..3691ae3f6 100644
--- a/src/api/DesktopAgent.ts
+++ b/src/api/DesktopAgent.ts
@@ -13,7 +13,6 @@ import { ImplementationMetadata } from './ImplementationMetadata';
 import { PrivateChannel } from './PrivateChannel';
 import { AppIdentifier } from './AppIdentifier';
 import { AppMetadata } from './AppMetadata';
-import { DesktopAgentDetails } from './GetAgent';
 import { Intent } from '../intents/Intents';
 import { ContextType } from '../context/ContextType';
 import { EventHandler, FDC3EventTypes } from './Events';
diff --git a/src/index.ts b/src/index.ts
index 5b50b6abe..26aca3e69 100644
--- a/src/index.ts
+++ b/src/index.ts
@@ -19,6 +19,7 @@ export * from './api/ContextMetadata';
 export * from './api/DesktopAgent';
 export * from './api/DisplayMetadata';
 export * from './api/Errors';
+export * from './api/GetAgent';
 export * from './api/Icon';
 export * from './api/Image';
 export * from './api/ImplementationMetadata';
@@ -42,6 +43,6 @@ export { BrowserTypes };
 
 declare global {
   interface Window {
-    fdc3: DesktopAgent;
+    fdc3?: DesktopAgent;
   }
 }