diff --git a/package.json b/package.json
index 4ed28508..b7df53e6 100644
--- a/package.json
+++ b/package.json
@@ -32,7 +32,7 @@
     "/messages"
   ],
   "dependencies": {
-    "@oclif/core": "^1.16.4",
+    "@oclif/core": "^1.19.0",
     "@salesforce/core": "^3.30.9",
     "@salesforce/kit": "^1.7.0",
     "@salesforce/ts-types": "^1.5.20",
@@ -71,4 +71,4 @@
   "publishConfig": {
     "access": "public"
   }
-}
\ No newline at end of file
+}
diff --git a/src/exported.ts b/src/exported.ts
index 446d1808..823d9750 100644
--- a/src/exported.ts
+++ b/src/exported.ts
@@ -10,7 +10,7 @@ import { Flags as OclifFlags } from '@oclif/core';
 export { toHelpSection, parseVarArgs } from './util';
 export { Deployable, Deployer, DeployerResult } from './deployer';
 export { Deauthorizer } from './deauthorizer';
-export { Progress, Prompter, generateTableChoices } from './ux';
+export { Progress, Prompter, generateTableChoices, Ux } from './ux';
 export { SfHook } from './hooks';
 export * from './types';
 export { SfCommand, SfCommandInterface, StandardColors } from './sfCommand';
diff --git a/src/flags/duration.ts b/src/flags/duration.ts
index d9c18ab2..42d901e2 100644
--- a/src/flags/duration.ts
+++ b/src/flags/duration.ts
@@ -42,7 +42,8 @@ export type DurationFlagConfig = {
  */
 export const durationFlag = Flags.custom<Duration, DurationFlagConfig>({
   parse: async (input, _, opts) => validate(input, opts),
-  default: async (context) => context.options.defaultValue ? toDuration(context.options.defaultValue, context.options.unit) : undefined,
+  default: async (context) =>
+    context.options.defaultValue ? toDuration(context.options.defaultValue, context.options.unit) : undefined,
 });
 
 const validate = (input: string, config: DurationFlagConfig): Duration => {
diff --git a/src/sfCommand.ts b/src/sfCommand.ts
index 9ceb0036..7c6e0999 100644
--- a/src/sfCommand.ts
+++ b/src/sfCommand.ts
@@ -15,7 +15,10 @@ import {
   Mode,
   EnvironmentVariable,
   SfError,
+  ConfigAggregator,
+  SfdxConfigAggregator,
 } from '@salesforce/core';
+import { env } from '@salesforce/kit';
 import { AnyJson } from '@salesforce/ts-types';
 import * as chalk from 'chalk';
 import { Progress, Prompter, Spinner, Ux } from './ux';
@@ -158,6 +161,34 @@ export abstract class SfCommand<T> extends Command {
   public progress: Progress;
   public project!: SfProject;
 
+  /**
+   * ConfigAggregator instance for accessing global and local configuration.
+   *
+   * NOTE: If the active executable is sfdx, this will be an instance of SfdxConfigAggregator, which supports
+   * the deprecated sfdx config vars like defaultusername, defaultdevhubusername, apiversion, etc. Otherwise,
+   * it will be an instance of ConfigAggregator will only supports the config vars introduce by @salesforce/core@v3.
+   *
+   * The executable is determined by `this.config.bin` which is supplied by the base oclif/core Command class. The value
+   * of `this.config.bin` will be the executable running (e.g. sfdx or sf) or, for local development (e.g. using bin/dev),
+   * it will be the value of oclif.bin in the plugin's package.json.
+   *
+   * If you need to write NUTS for a plugin that needs to work with both sets of config vars you can
+   * use set the `SF_USE_DEPRECATED_CONFIG_VARS` to `true` to force configAggregator to be an instance of SfdxConfigAggregator or
+   * `false` to force configAggregator to be an instance of ConfigAggregator.
+   *
+   * @example
+   * ```
+   * import { execCmd } from '@salesforce/cli-plugins-testkit';
+   * execCmd('config:set defaultusername=test@example.com', {
+   *   env: {
+   *     ...process.env,
+   *     SF_USE_DEPRECATED_CONFIG_VARS: true,
+   *   }
+   * })
+   * ```
+   */
+  public configAggregator!: ConfigAggregator;
+
   private warnings: SfCommand.Warning[] = [];
   private ux: Ux;
   private prompter: Prompter;
@@ -166,10 +197,10 @@ export abstract class SfCommand<T> extends Command {
   public constructor(argv: string[], config: Config) {
     super(argv, config);
     const outputEnabled = !this.jsonEnabled();
-    this.spinner = new Spinner(outputEnabled);
     this.progress = new Progress(outputEnabled && envVars.getBoolean(EnvironmentVariable.SF_USE_PROGRESS_BAR, true));
     this.ux = new Ux(outputEnabled);
-    this.prompter = new Prompter();
+    this.spinner = this.ux.spinner;
+    this.prompter = this.ux.prompter;
     this.lifecycle = Lifecycle.getInstance();
   }
 
@@ -329,6 +360,13 @@ export abstract class SfCommand<T> extends Command {
   }
 
   public async _run<R>(): Promise<R | undefined> {
+    this.configAggregator =
+      this.config.bin === 'sfdx' ??
+      env.getBoolean('SF_USE_DEPRECATED_CONFIG_VARS') ??
+      env.getBoolean('SFDX_USE_DEPRECATED_CONFIG_VARS')
+        ? await SfdxConfigAggregator.create()
+        : await ConfigAggregator.create();
+
     if (this.statics.requiresProject) {
       this.project = await this.assignProject();
     }
diff --git a/src/ux/base.ts b/src/ux/base.ts
index b10f46ef..96473d56 100644
--- a/src/ux/base.ts
+++ b/src/ux/base.ts
@@ -8,7 +8,7 @@
 import { AnyFunction } from '@salesforce/ts-types';
 
 export class UxBase {
-  public constructor(protected outputEnabled: boolean) {}
+  public constructor(public readonly outputEnabled: boolean) {}
 
   protected maybeNoop(fn: AnyFunction<unknown>): void {
     if (this.outputEnabled) fn();
diff --git a/src/ux/ux.ts b/src/ux/ux.ts
index 77151804..955f8b4e 100644
--- a/src/ux/ux.ts
+++ b/src/ux/ux.ts
@@ -8,28 +8,100 @@
 import { CliUx } from '@oclif/core';
 import { AnyJson } from '@salesforce/ts-types';
 import { UxBase } from './base';
+import { Prompter } from './prompter';
+import { Spinner } from './spinner';
 
+/**
+ * UX methods for plugins. Automatically suppress console output if outputEnabled is set to false.
+ *
+ * @example
+ * ```
+ * import { SfCommand, Ux } from '@salesforce/sf-plugins-core';
+ * import { AnyJson } from '@salesforce/ts-types';
+ *
+ * class MyCommand extends SfCommand<AnyJson> {
+ *   public async run(): Promise<AnyJson> {
+ *     const ux = new Ux(!this.jsonEnabled());
+ *   }
+ * }
+ *
+ * ```
+ */
 export class Ux extends UxBase {
-  public constructor(outputEnabled: boolean) {
+  public spinner: Spinner;
+  public prompter: Prompter;
+
+  public constructor(public readonly outputEnabled: boolean) {
     super(outputEnabled);
+    this.spinner = new Spinner(outputEnabled);
+    this.prompter = new Prompter();
+  }
+
+  /**
+   * Log a message to the console. This will be automatically suppressed if output is disabled.
+   *
+   * @param message Message to log. Formatting is supported.
+   * @param args Args to be used for formatting.
+   */
+  public log(message?: string, ...args: string[]): void {
+    this.maybeNoop(() => CliUx.ux.log(message, ...args));
+  }
+
+  /**
+   * Log a warning message to the console. This will be automatically suppressed if output is disabled.
+   *
+   * @param message Warning message to log.
+   */
+  public warn(message: string | Error): void {
+    this.maybeNoop(() => CliUx.ux.warn(message));
   }
 
+  /**
+   * Display a table to the console. This will be automatically suppressed if output is disabled.
+   *
+   * @param data Data to be displayed
+   * @param columns Columns to display the data in
+   * @param options Options for how the table should be displayed
+   */
   public table<T extends Ux.Table.Data>(data: T[], columns: Ux.Table.Columns<T>, options?: Ux.Table.Options): void {
     this.maybeNoop(() => CliUx.ux.table(data, columns, options));
   }
 
+  /**
+   * Display a url to the console. This will be automatically suppressed if output is disabled.
+   *
+   * @param text text to display
+   * @param uri URL link
+   * @param params
+   */
   public url(text: string, uri: string, params = {}): void {
     this.maybeNoop(() => CliUx.ux.url(text, uri, params));
   }
 
+  /**
+   * Display stylized JSON to the console. This will be automatically suppressed if output is disabled.
+   *
+   * @param obj JSON to display
+   */
   public styledJSON(obj: AnyJson): void {
     this.maybeNoop(() => CliUx.ux.styledJSON(obj));
   }
 
-  public styledObject(obj: AnyJson): void {
-    this.maybeNoop(() => CliUx.ux.styledObject(obj));
+  /**
+   * Display stylized object to the console. This will be automatically suppressed if output is disabled.
+   *
+   * @param obj Object to display
+   * @param keys Keys of object to display
+   */
+  public styledObject(obj: AnyJson, keys?: string[]): void {
+    this.maybeNoop(() => CliUx.ux.styledObject(obj, keys));
   }
 
+  /**
+   * Display stylized header to the console. This will be automatically suppressed if output is disabled.
+   *
+   * @param text header to display
+   */
   public styledHeader(text: string): void {
     this.maybeNoop(() => CliUx.ux.styledHeader(text));
   }
diff --git a/yarn.lock b/yarn.lock
index 9c6e46ed..edc3508e 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -540,10 +540,10 @@
     is-wsl "^2.1.1"
     tslib "^2.0.0"
 
-"@oclif/core@^1.16.4", "@oclif/core@^1.18.0":
-  version "1.18.0"
-  resolved "https://registry.yarnpkg.com/@oclif/core/-/core-1.18.0.tgz#93c790c663c6b24a609d1ea44362f5438cb19d73"
-  integrity sha512-12SWbbDbMrhBmEuN9cOQkbN+sFUKlSTw+NlCPVVIg3uEhnmkXgx2wZJtCN4c+IBMJjC27L9lDneeoe70yQuiVg==
+"@oclif/core@^1.18.0", "@oclif/core@^1.19.0":
+  version "1.19.0"
+  resolved "https://registry.yarnpkg.com/@oclif/core/-/core-1.19.0.tgz#b2e5260c2344e5905312efd7538daacaedb75cbf"
+  integrity sha512-4R087E3TAG6Q9cvr+4wnlryHbciioXkZmUF/Qmc08dReoFus1BIfwtR5kUa/thNmQBw5oeGnrxnl9yA/TaxAmA==
   dependencies:
     "@oclif/linewrap" "^1.0.0"
     "@oclif/screen" "^3.0.2"