diff --git a/src/env/node/gk/cli/commands.ts b/src/env/node/gk/cli/commands.ts
index f7d60d69309a8..a2b17c964f5b8 100644
--- a/src/env/node/gk/cli/commands.ts
+++ b/src/env/node/gk/cli/commands.ts
@@ -1,3 +1,4 @@
+/* eslint-disable @typescript-eslint/require-await */
 import type { Disposable } from 'vscode';
 import type { CompareWithCommandArgs } from '../../../../commands/compareWith';
 import type { Container } from '../../../../container';
@@ -67,7 +68,7 @@ export class CliCommandHandlers implements Disposable {
 		_request: CliCommandRequest,
 		repo?: Repository | undefined,
 	): Promise<CliCommandResponse> {
-		return cherryPick(repo);
+		void cherryPick(repo);
 	}
 
 	@command('compare')
@@ -76,51 +77,48 @@ export class CliCommandHandlers implements Disposable {
 		repo?: Repository | undefined,
 	): Promise<CliCommandResponse> {
 		if (!repo || !_request.args?.length) {
-			await executeCommand('gitlens.compareWith');
+			void executeCommand('gitlens.compareWith');
 			return;
 		}
 
 		const [ref1, ref2] = _request.args;
 		if (!ref1 || !ref2) {
-			await executeCommand('gitlens.compareWith');
+			void executeCommand('gitlens.compareWith');
 			return;
 		}
 
 		if (ref1) {
 			if (!(await repo.git.refs().validateReference(ref1))) {
-				// TODO: Send an error back to the CLI?
-				await executeCommand('gitlens.compareWith');
-				return;
+				void executeCommand('gitlens.compareWith');
+				return { stderr: `${ref1} is an invalid reference` };
 			}
 		}
 
 		if (ref2) {
 			if (!(await repo.git.refs().validateReference(ref2))) {
-				// TODO: Send an error back to the CLI?
-				await executeCommand<CompareWithCommandArgs>('gitlens.compareWith', { ref1: ref1 });
-				return;
+				void executeCommand<CompareWithCommandArgs>('gitlens.compareWith', { ref1: ref1 });
+				return { stderr: `${ref2} is an invalid reference` };
 			}
 		}
 
-		await executeCommand<CompareWithCommandArgs>('gitlens.compareWith', { ref1: ref1, ref2: ref2 });
+		void executeCommand<CompareWithCommandArgs>('gitlens.compareWith', { ref1: ref1, ref2: ref2 });
 	}
 
 	@command('graph')
 	async handleGraphCommand(request: CliCommandRequest, repo?: Repository | undefined): Promise<CliCommandResponse> {
 		if (!repo || !request.args?.length) {
-			await executeCommand('gitlens.showGraphView');
+			void executeCommand('gitlens.showGraphView');
 			return;
 		}
 
 		const [ref] = request.args;
 		const reference = await repo.git.refs().getReference(ref);
 		if (ref && !reference) {
-			// TODO: Send an error back to the CLI?
-			await executeCommand('gitlens.showInCommitGraph', repo);
-			return;
+			void executeCommand('gitlens.showInCommitGraph', repo);
+			return { stderr: `${ref} is an invalid reference` };
 		}
 
-		await executeCommand('gitlens.showInCommitGraph', { ref: reference });
+		void executeCommand('gitlens.showInCommitGraph', { ref: reference });
 	}
 
 	@command('merge')
@@ -129,10 +127,12 @@ export class CliCommandHandlers implements Disposable {
 
 		const [ref] = request.args;
 		const reference = await repo.git.refs().getReference(ref);
+
+		void merge(repo, reference);
+
 		if (ref && !reference) {
-			// TODO: Send an error back to the CLI?
+			return { stderr: `${ref} is an invalid reference` };
 		}
-		return merge(repo, reference);
 	}
 
 	@command('rebase')
@@ -141,10 +141,11 @@ export class CliCommandHandlers implements Disposable {
 
 		const [ref] = request.args;
 		const reference = await repo.git.refs().getReference(ref);
+
+		void rebase(repo, reference);
+
 		if (ref && !reference) {
-			// TODO: Send an error back to the CLI?
+			return { stderr: `${ref} is an invalid reference` };
 		}
-
-		return rebase(repo, reference);
 	}
 }
diff --git a/src/env/node/gk/cli/integration.ts b/src/env/node/gk/cli/integration.ts
index fd3105b956b16..cf8b02a24e674 100644
--- a/src/env/node/gk/cli/integration.ts
+++ b/src/env/node/gk/cli/integration.ts
@@ -3,14 +3,14 @@ import { Disposable } from 'vscode';
 import type { Container } from '../../../../container';
 import { configuration } from '../../../../system/-webview/configuration';
 import { CliCommandHandlers } from './commands';
-import type { IpcServer } from './server';
-import { createIpcServer } from './server';
+import type { IpcServer } from './ipcServer';
+import { createIpcServer } from './ipcServer';
 
 export interface CliCommandRequest {
 	cwd?: string;
 	args?: string[];
 }
-export type CliCommandResponse = string | void;
+export type CliCommandResponse = { stdout?: string; stderr?: string } | void;
 export type CliIpcServer = IpcServer<CliCommandRequest, CliCommandResponse>;
 
 export class GkCliIntegrationProvider implements Disposable {
diff --git a/src/env/node/gk/cli/server.ts b/src/env/node/gk/cli/ipcServer.ts
similarity index 93%
rename from src/env/node/gk/cli/server.ts
rename to src/env/node/gk/cli/ipcServer.ts
index 9e665fba6c889..34505c47038fd 100644
--- a/src/env/node/gk/cli/server.ts
+++ b/src/env/node/gk/cli/ipcServer.ts
@@ -81,11 +81,18 @@ export class IpcServer<Request = unknown, Response = void> implements Disposable
 			const data = JSON.parse(Buffer.concat(chunks).toString('utf8'));
 			try {
 				const result = await handler(data);
-				res.writeHead(200);
-				if (result != null && typeof result === 'string') {
+				if (result == null) {
+					res.writeHead(200);
+					res.end();
+					return;
+				}
+
+				if (typeof result === 'string') {
+					res.writeHead(200);
 					res.end(result);
 				} else {
-					res.end();
+					res.writeHead(200);
+					res.end(JSON.stringify(result));
 				}
 			} catch (ex) {
 				Logger.error(ex, 'IPC handler error', data);