diff --git a/src/command-registry.ts b/src/command-registry.ts
index b258a2d..cbc5535 100644
--- a/src/command-registry.ts
+++ b/src/command-registry.ts
@@ -1,3 +1,4 @@
+import ChangesAdd, { changesAddConfig } from './commands/changes/add.js';
 import Help, { helpConfig } from './commands/help.js';
 import Hop, { hopConfig } from './commands/hop.js';
 import Sync, { syncConfig } from './commands/sync.js';
@@ -20,4 +21,15 @@ export const REGISTERED_COMMANDS: CommandGroup = {
         component: Sync,
         config: syncConfig,
     },
+    changes: {
+        _group: {
+            alias: 'c',
+            name: 'changes',
+            description: 'Commands related to staged changes',
+        },
+        add: {
+            component: ChangesAdd,
+            config: changesAddConfig,
+        },
+    } as CommandGroup,
 } as const;
diff --git a/src/commands/changes/add.test.tsx b/src/commands/changes/add.test.tsx
new file mode 100644
index 0000000..5250f42
--- /dev/null
+++ b/src/commands/changes/add.test.tsx
@@ -0,0 +1,100 @@
+import ChangesAdd from './add.js';
+import React from 'react';
+import { Text } from 'ink';
+import { delay } from '../../utils/time.js';
+import { describe, expect, it, vi } from 'vitest';
+import { render } from '@levelbreaded/ink-testing-library';
+
+const ARBITRARY_DELAY = 250; // ms
+
+const mocks = vi.hoisted(() => {
+    return {
+        createGitService: vi.fn(({}) => {
+            return {
+                addAllFiles: async () => {
+                    return new Promise((resolve) =>
+                        setTimeout(resolve, ARBITRARY_DELAY)
+                    );
+                },
+            };
+        }),
+    };
+});
+
+vi.mock('../../services/git.js', () => {
+    return {
+        DEFAULT_OPTIONS: {},
+        createGitService: mocks.createGitService,
+    };
+});
+
+const LOADING_MESSAGE = 'Loading...';
+const SUCCESS_MESSAGE = 'Staged all changes';
+
+describe('correctly renders changes add UI', () => {
+    it('runs as intended', async () => {
+        const actual1 = render(
+            <ChangesAdd
+                cli={{
+                    flags: {},
+                    unnormalizedFlags: {},
+                }}
+                input={['changes', 'add']}
+            />
+        );
+
+        const actual2 = render(
+            <ChangesAdd
+                cli={{
+                    flags: {},
+                    unnormalizedFlags: {},
+                }}
+                input={['changes', 'a']}
+            />
+        );
+
+        const ExpectedComp = () => {
+            return (
+                <Text bold color="green">
+                    {SUCCESS_MESSAGE}
+                </Text>
+            );
+        };
+        const expected = render(<ExpectedComp />);
+
+        await delay(ARBITRARY_DELAY + 250);
+        expect(actual1.lastFrame()).to.equal(expected.lastFrame());
+        expect(actual2.lastFrame()).to.equal(expected.lastFrame());
+    });
+
+    it('displays a loading state while processing', async () => {
+        const actual1 = render(
+            <ChangesAdd
+                cli={{
+                    flags: {},
+                    unnormalizedFlags: {},
+                }}
+                input={['changes', 'add']}
+            />
+        );
+
+        const actual2 = render(
+            <ChangesAdd
+                cli={{
+                    flags: {},
+                    unnormalizedFlags: {},
+                }}
+                input={['changes', 'a']}
+            />
+        );
+
+        const ExpectedComp = () => {
+            return <Text color="cyan">{LOADING_MESSAGE}</Text>;
+        };
+        const expected = render(<ExpectedComp />);
+
+        await delay(ARBITRARY_DELAY / 2);
+        expect(actual1.lastFrame()).to.equal(expected.lastFrame());
+        expect(actual2.lastFrame()).to.equal(expected.lastFrame());
+    });
+});
diff --git a/src/commands/changes/add.tsx b/src/commands/changes/add.tsx
new file mode 100644
index 0000000..70df36f
--- /dev/null
+++ b/src/commands/changes/add.tsx
@@ -0,0 +1,80 @@
+import ErrorDisplay from '../../components/error-display.js';
+import React, { useEffect, useState } from 'react';
+import { CommandConfig, CommandProps } from '../../types.js';
+import { Text } from 'ink';
+import { useGit } from '../../hooks/use-git.js';
+
+function ChangedAdd({}: CommandProps) {
+    const result = useChangesAdd();
+
+    if (result.isError) {
+        return <ErrorDisplay error={result.error} />;
+    }
+
+    if (result.isLoading) {
+        return <Text color="cyan">Loading...</Text>;
+    }
+
+    return (
+        <Text bold color="green">
+            Staged all changes
+        </Text>
+    );
+}
+
+type Action = { isLoading: boolean } & (
+    | {
+          isError: false;
+      }
+    | {
+          isError: true;
+          error: Error;
+      }
+);
+
+type State =
+    | {
+          type: 'LOADING';
+      }
+    | {
+          type: 'COMPLETE';
+      }
+    | {
+          type: 'ERROR';
+          error: Error;
+      };
+
+const useChangesAdd = (): Action => {
+    const git = useGit();
+    const [state, setState] = useState<State>({ type: 'LOADING' });
+
+    useEffect(() => {
+        git.addAllFiles()
+            .then(() => setState({ type: 'COMPLETE' }))
+            .catch((e: Error) => {
+                setState({ type: 'ERROR', error: e });
+            });
+    }, []);
+
+    if (state.type === 'ERROR') {
+        return {
+            isLoading: false,
+            isError: true,
+            error: state.error,
+        };
+    }
+
+    return {
+        isLoading: state.type === 'LOADING',
+        isError: false,
+    };
+};
+
+export const changesAddConfig: CommandConfig = {
+    description: 'Stage all changes.',
+    usage: 'changes add',
+    key: 'add',
+    aliases: ['a'],
+};
+
+export default ChangedAdd;
diff --git a/src/services/git.ts b/src/services/git.ts
index 8952f57..e913926 100644
--- a/src/services/git.ts
+++ b/src/services/git.ts
@@ -11,6 +11,7 @@ export interface GitService {
     _git: SimpleGit;
     branchLocal: () => Promise<ReturnType<SimpleGit['branchLocal']>>;
     checkout: (branch: string) => Promise<ReturnType<SimpleGit['checkout']>>;
+    addAllFiles: () => Promise<void>;
 }
 
 export const createGitService = ({
@@ -29,5 +30,8 @@ export const createGitService = ({
         branchLocal: async () => {
             return gitEngine.branchLocal();
         },
+        addAllFiles: async () => {
+            await gitEngine.add('.');
+        },
     };
 };