diff --git a/src/extension.ts b/src/extension.ts
index e741075..9fbf744 100644
--- a/src/extension.ts
+++ b/src/extension.ts
@@ -43,7 +43,7 @@ const LEAN_MODE: DocumentFilter = {
     // scheme: 'file',
 };
 
-export async function activate(context: ExtensionContext): Promise<void> {
+export async function activate(context: ExtensionContext) {
     const isLean3 = await checkLean3();
     if (!isLean3) {
         return;
@@ -107,9 +107,10 @@ export async function activate(context: ExtensionContext): Promise<void> {
     context.subscriptions.push(new LeanStatusBarItem(server, roiManager));
 
     let staticServer = null;
+    let infoView : InfoProvider = null;
     function waitStaticServer() {
         // Add info view: listing either the current goal state or a list of all error messages
-        const infoView = new InfoProvider(server, LEAN_MODE, context, staticServer);
+        infoView = new InfoProvider(server, LEAN_MODE, context, staticServer);
         context.subscriptions.push(infoView);
         context.subscriptions.push(new DocViewProvider(staticServer));
         // Tactic suggestions
@@ -128,4 +129,6 @@ export async function activate(context: ExtensionContext): Promise<void> {
 
     context.subscriptions.push(languages.registerDocumentLinkProvider(LEAN_MODE,
         new LibraryNoteLinkProvider()));
+
+    return {'infoView': infoView}; // export infoView for other plugins to use
 }
diff --git a/src/infoview.ts b/src/infoview.ts
index 851f75b..dcf2ede 100644
--- a/src/infoview.ts
+++ b/src/infoview.ts
@@ -28,8 +28,10 @@ export class InfoProvider implements Disposable {
 
     private hoverDecorationType: TextEditorDecorationType;
 
-    constructor(private server: Server, private leanDocs: DocumentSelector, private context: ExtensionContext, private staticServer?: StaticServer) {
+    // Callbacks when a new tactic state is received
+    private tacticStateHandlers: { [id: string] : (state: string, widget: object) => void; } = {};
 
+    constructor(private server: Server, private leanDocs: DocumentSelector, private context: ExtensionContext, private staticServer?: StaticServer) {
         this.statusBarItem = window.createStatusBarItem(StatusBarAlignment.Right, 1000);
 
         this.hoverDecorationType = window.createTextEditorDecorationType({
@@ -108,6 +110,10 @@ export class InfoProvider implements Disposable {
         }
     }
 
+    onNewTacticState(handler_name: string, handler: (state: string, widget: object) => void): void {
+        this.tacticStateHandlers[handler_name] = handler;
+    }
+
     private makeProxyConnection() {
         if (this.proxyConnection) {
             this.proxyConnection.dispose();
@@ -120,12 +126,17 @@ export class InfoProvider implements Disposable {
                     payload: JSON.stringify(e)
                 })
             ),
-            this.proxyConnection.jsonMessage.on(e =>
+            this.proxyConnection.jsonMessage.on(e => {
+                if ('record' in e && 'state' in e.record && 'widget' in e.record){
+                    for (const [handlerName, handler] of Object.entries(this.tacticStateHandlers)) {
+                        handler(e.record.state, e.record.widget);
+                    }
+                }
                 this.postMessage({
                     command: 'server_event',
                     payload: JSON.stringify(e)
-                })
-            )
+                });
+            })
         );
 
     }