diff --git a/packages/core/__tests__/core.test.ts b/packages/core/__tests__/core.test.ts
index 2928788d7f..8dcedd7097 100644
--- a/packages/core/__tests__/core.test.ts
+++ b/packages/core/__tests__/core.test.ts
@@ -1,7 +1,7 @@
 import * as fs from 'fs'
 import * as os from 'os'
 import * as path from 'path'
-import * as core from '../src/core'
+import * as core from '../src/index'
 import {HttpClient} from '@actions/http-client'
 import {toCommandProperties} from '../src/utils'
 
diff --git a/packages/core/__tests__/platform.test.ts b/packages/core/__tests__/platform.test.ts
index c80be33092..a45f638110 100644
--- a/packages/core/__tests__/platform.test.ts
+++ b/packages/core/__tests__/platform.test.ts
@@ -1,5 +1,5 @@
 import os from 'os'
-import {platform} from '../src/core'
+import {platform} from '../src/index'
 
 describe('getInfo', () => {
   it('returns the platform info', async () => {
diff --git a/packages/core/package.json b/packages/core/package.json
index 6d60010e37..d9dd119ad1 100644
--- a/packages/core/package.json
+++ b/packages/core/package.json
@@ -9,8 +9,8 @@
   ],
   "homepage": "https://github.com/actions/toolkit/tree/main/packages/core",
   "license": "MIT",
-  "main": "lib/core.js",
-  "types": "lib/core.d.ts",
+  "main": "lib/index.js",
+  "types": "lib/index.d.ts",
   "directories": {
     "lib": "lib",
     "test": "__tests__"
diff --git a/packages/core/src/core-types.ts b/packages/core/src/core-types.ts
new file mode 100644
index 0000000000..a1400835df
--- /dev/null
+++ b/packages/core/src/core-types.ts
@@ -0,0 +1,36 @@
+/**
+ * Optional properties that can be sent with annotation commands (notice, error, and warning)
+ * See: https://docs.github.com/en/rest/reference/checks#create-a-check-run for more information about annotations.
+ */
+export interface AnnotationProperties {
+  /**
+   * A title for the annotation.
+   */
+  title?: string
+
+  /**
+   * The path of the file for which the annotation should be created.
+   */
+  file?: string
+
+  /**
+   * The start line for the annotation.
+   */
+  startLine?: number
+
+  /**
+   * The end line for the annotation. Defaults to `startLine` when `startLine` is provided.
+   */
+  endLine?: number
+
+  /**
+   * The start column for the annotation. Cannot be sent when `startLine` and `endLine` are different values.
+   */
+  startColumn?: number
+
+  /**
+   * The end column for the annotation. Cannot be sent when `startLine` and `endLine` are different values.
+   * Defaults to `startColumn` when `startColumn` is provided.
+   */
+  endColumn?: number
+}
diff --git a/packages/core/src/core.ts b/packages/core/src/core.ts
index e9091ba206..30b7ae6cd2 100644
--- a/packages/core/src/core.ts
+++ b/packages/core/src/core.ts
@@ -1,12 +1,11 @@
 import {issue, issueCommand} from './command'
 import {issueFileCommand, prepareKeyValueMessage} from './file-command'
 import {toCommandProperties, toCommandValue} from './utils'
+import {AnnotationProperties} from './core-types'
 
 import * as os from 'os'
 import * as path from 'path'
 
-import {OidcClient} from './oidc-utils'
-
 /**
  * Interface for getInput options
  */
@@ -33,43 +32,6 @@ export enum ExitCode {
   Failure = 1
 }
 
-/**
- * Optional properties that can be sent with annotation commands (notice, error, and warning)
- * See: https://docs.github.com/en/rest/reference/checks#create-a-check-run for more information about annotations.
- */
-export interface AnnotationProperties {
-  /**
-   * A title for the annotation.
-   */
-  title?: string
-
-  /**
-   * The path of the file for which the annotation should be created.
-   */
-  file?: string
-
-  /**
-   * The start line for the annotation.
-   */
-  startLine?: number
-
-  /**
-   * The end line for the annotation. Defaults to `startLine` when `startLine` is provided.
-   */
-  endLine?: number
-
-  /**
-   * The start column for the annotation. Cannot be sent when `startLine` and `endLine` are different values.
-   */
-  startColumn?: number
-
-  /**
-   * The end column for the annotation. Cannot be sent when `startLine` and `endLine` are different values.
-   * Defaults to `startColumn` when `startColumn` is provided.
-   */
-  endColumn?: number
-}
-
 //-----------------------------------------------------------------------
 // Variables
 //-----------------------------------------------------------------------
@@ -392,27 +354,3 @@ export function saveState(name: string, value: any): void {
 export function getState(name: string): string {
   return process.env[`STATE_${name}`] || ''
 }
-
-export async function getIDToken(aud?: string): Promise<string> {
-  return await OidcClient.getIDToken(aud)
-}
-
-/**
- * Summary exports
- */
-export {summary} from './summary'
-
-/**
- * @deprecated use core.summary
- */
-export {markdownSummary} from './summary'
-
-/**
- * Path exports
- */
-export {toPosixPath, toWin32Path, toPlatformPath} from './path-utils'
-
-/**
- * Platform utilities exports
- */
-export * as platform from './platform'
diff --git a/packages/core/src/index.ts b/packages/core/src/index.ts
new file mode 100644
index 0000000000..a1ac869ed3
--- /dev/null
+++ b/packages/core/src/index.ts
@@ -0,0 +1,34 @@
+/**
+ * Core exports
+ */
+export * from './core'
+
+/**
+ * Core types exports
+ */
+export {AnnotationProperties} from './core-types'
+
+/**
+ * Summary exports
+ */
+export {summary} from './summary'
+
+/**
+ * @deprecated use core.summary
+ */
+export {markdownSummary} from './summary'
+
+/**
+ * Path exports
+ */
+export {toPosixPath, toWin32Path, toPlatformPath} from './path-utils'
+
+/**
+ * Platform utilities exports
+ */
+export * as platform from './platform'
+
+/**
+ * OIDC utilities exports
+ */
+export {getIDToken} from './oidc-utils'
diff --git a/packages/core/src/oidc-utils.ts b/packages/core/src/oidc-utils.ts
index 382fb13c65..cc4da8dc16 100644
--- a/packages/core/src/oidc-utils.ts
+++ b/packages/core/src/oidc-utils.ts
@@ -8,7 +8,7 @@ interface TokenResponse {
   value?: string
 }
 
-export class OidcClient {
+class OidcClient {
   private static createHttpClient(
     allowRetry = true,
     maxRetry = 10
@@ -82,3 +82,7 @@ export class OidcClient {
     }
   }
 }
+
+export async function getIDToken(aud?: string): Promise<string> {
+  return await OidcClient.getIDToken(aud)
+}
diff --git a/packages/core/src/utils.ts b/packages/core/src/utils.ts
index c43f387011..4a92c9190d 100644
--- a/packages/core/src/utils.ts
+++ b/packages/core/src/utils.ts
@@ -1,7 +1,7 @@
 // We use any as a valid input type
 /* eslint-disable @typescript-eslint/no-explicit-any */
 
-import {AnnotationProperties} from './core'
+import {AnnotationProperties} from './core-types'
 import {CommandProperties} from './command'
 
 /**