diff --git a/.github/workflows/artifact-tests.yml b/.github/workflows/artifact-tests.yml
index c6988efe..7bbb4aa9 100644
--- a/.github/workflows/artifact-tests.yml
+++ b/.github/workflows/artifact-tests.yml
@@ -24,10 +24,10 @@ jobs:
 
     steps:
     - name: Checkout
-      uses: actions/checkout@v3
+      uses: actions/checkout@v4
 
     - name: Set Node.js 20.x
-      uses: actions/setup-node@v3
+      uses: actions/setup-node@v4
       with:
         node-version: 20.x
 
@@ -54,8 +54,8 @@ jobs:
         echo '${{ env.file1 }}' > artifact-path/first.txt
         echo '${{ env.file2 }}' > artifact-path/second.txt
 
-    - name: Upload Artifacts using actions/github-script@v6
-      uses: actions/github-script@v6
+    - name: Upload Artifacts using actions/github-script@v7
+      uses: actions/github-script@v7
       with:
         script: |
           const artifact = require('./packages/artifact/lib/artifact')
@@ -68,25 +68,20 @@ jobs:
           const uploadResult = await artifact.create().uploadArtifact(artifactName, fileContents, './')
           console.log(uploadResult)
 
-          const success = uploadResult.success
           const size = uploadResult.size
           const id = uploadResult.id
 
-          if (!success) {
-            throw new Error('Failed to upload artifact')
-          } else {
-            console.log(`Successfully uploaded artifact ${id}`)
-          }
+          console.log(`Successfully uploaded artifact ${id}`)
            
   verify:
     runs-on: ubuntu-latest
     needs: [build]
     steps:
     - name: Checkout
-      uses: actions/checkout@v3
+      uses: actions/checkout@v4
 
     - name: Set Node.js 20.x
-      uses: actions/setup-node@v3
+      uses: actions/setup-node@v4
       with:
         node-version: 20.x
 
@@ -101,8 +96,8 @@ jobs:
         npm run tsc
       working-directory: packages/artifact
 
-    - name: List artifacts using actions/github-script@v6
-      uses: actions/github-script@v6
+    - name: List artifacts using actions/github-script@v7
+      uses: actions/github-script@v7
       with:
         script: |
           const artifact = require('./packages/artifact/lib/artifact')
diff --git a/packages/artifact/__tests__/download-artifact.test.ts b/packages/artifact/__tests__/download-artifact.test.ts
index f28d442d..247a5e42 100644
--- a/packages/artifact/__tests__/download-artifact.test.ts
+++ b/packages/artifact/__tests__/download-artifact.test.ts
@@ -164,7 +164,6 @@ describe('download-artifact', () => {
         fixtures.blobStorageUrl
       )
       expectExtractedArchive(fixtures.workspaceDir)
-      expect(response.success).toBe(true)
       expect(response.downloadPath).toBe(fixtures.workspaceDir)
     })
 
@@ -214,7 +213,6 @@ describe('download-artifact', () => {
         fixtures.blobStorageUrl
       )
       expectExtractedArchive(customPath)
-      expect(response.success).toBe(true)
       expect(response.downloadPath).toBe(customPath)
     })
 
@@ -344,7 +342,6 @@ describe('download-artifact', () => {
       const response = await downloadArtifactInternal(fixtures.artifactID)
 
       expectExtractedArchive(fixtures.workspaceDir)
-      expect(response.success).toBe(true)
       expect(response.downloadPath).toBe(fixtures.workspaceDir)
       expect(mockHttpClient).toHaveBeenCalledWith(getUserAgentString())
       expect(mockListArtifacts).toHaveBeenCalledWith({
@@ -396,7 +393,6 @@ describe('download-artifact', () => {
       })
 
       expectExtractedArchive(customPath)
-      expect(response.success).toBe(true)
       expect(response.downloadPath).toBe(customPath)
       expect(mockHttpClient).toHaveBeenCalledWith(getUserAgentString())
       expect(mockListArtifacts).toHaveBeenCalledWith({
diff --git a/packages/artifact/__tests__/get-artifact.test.ts b/packages/artifact/__tests__/get-artifact.test.ts
index 82008a4b..56ed0d34 100644
--- a/packages/artifact/__tests__/get-artifact.test.ts
+++ b/packages/artifact/__tests__/get-artifact.test.ts
@@ -8,6 +8,10 @@ import * as config from '../src/internal/shared/config'
 import {ArtifactServiceClientJSON, Timestamp} from '../src/generated'
 import * as util from '../src/internal/shared/util'
 import {noopLogs} from './common'
+import {
+  ArtifactNotFoundError,
+  InvalidResponseError
+} from '../src/internal/shared/errors'
 
 type MockedRequest = jest.MockedFunction<RequestInterface<object>>
 
@@ -76,7 +80,6 @@ describe('get-artifact', () => {
       )
 
       expect(response).toEqual({
-        success: true,
         artifact: fixtures.artifacts[0]
       })
     })
@@ -107,7 +110,6 @@ describe('get-artifact', () => {
       )
 
       expect(response).toEqual({
-        success: true,
         artifact: fixtures.artifacts[1]
       })
     })
@@ -124,7 +126,7 @@ describe('get-artifact', () => {
         }
       })
 
-      const response = await getArtifactPublic(
+      const response = getArtifactPublic(
         fixtures.artifacts[0].name,
         fixtures.runId,
         fixtures.owner,
@@ -132,9 +134,7 @@ describe('get-artifact', () => {
         fixtures.token
       )
 
-      expect(response).toEqual({
-        success: false
-      })
+      expect(response).rejects.toThrowError(ArtifactNotFoundError)
     })
 
     it('should fail if non-200 response', async () => {
@@ -147,7 +147,7 @@ describe('get-artifact', () => {
         data: {}
       })
 
-      const response = await getArtifactPublic(
+      const response = getArtifactPublic(
         fixtures.artifacts[0].name,
         fixtures.runId,
         fixtures.owner,
@@ -155,9 +155,7 @@ describe('get-artifact', () => {
         fixtures.token
       )
 
-      expect(response).toEqual({
-        success: false
-      })
+      expect(response).rejects.toThrowError(InvalidResponseError)
     })
   })
 
@@ -192,7 +190,6 @@ describe('get-artifact', () => {
       const response = await getArtifactInternal(fixtures.artifacts[0].name)
 
       expect(response).toEqual({
-        success: true,
         artifact: fixtures.artifacts[0]
       })
     })
@@ -213,7 +210,6 @@ describe('get-artifact', () => {
       const response = await getArtifactInternal(fixtures.artifacts[0].name)
 
       expect(response).toEqual({
-        success: true,
         artifact: fixtures.artifacts[1]
       })
     })
@@ -225,21 +221,19 @@ describe('get-artifact', () => {
           artifacts: []
         })
 
-      const response = await getArtifactInternal(fixtures.artifacts[0].name)
+      const response = getArtifactInternal(fixtures.artifacts[0].name)
 
-      expect(response).toEqual({
-        success: false
-      })
+      expect(response).rejects.toThrowError(ArtifactNotFoundError)
     })
 
     it('should fail if non-200 response', async () => {
       jest
         .spyOn(ArtifactServiceClientJSON.prototype, 'ListArtifacts')
-        .mockRejectedValue(new Error('test error'))
+        .mockRejectedValue(new Error('boom'))
 
-      await expect(
-        getArtifactInternal(fixtures.artifacts[0].name)
-      ).rejects.toThrow('test error')
+      const response = getArtifactInternal(fixtures.artifacts[0].name)
+
+      expect(response).rejects.toThrow()
     })
   })
 })
diff --git a/packages/artifact/__tests__/upload-artifact.test.ts b/packages/artifact/__tests__/upload-artifact.test.ts
index 439a96a3..b0dca5c8 100644
--- a/packages/artifact/__tests__/upload-artifact.test.ts
+++ b/packages/artifact/__tests__/upload-artifact.test.ts
@@ -7,6 +7,7 @@ import {Timestamp, ArtifactServiceClientJSON} from '../src/generated'
 import * as blobUpload from '../src/internal/upload/blob-upload'
 import {uploadArtifact} from '../src/internal/upload/upload-artifact'
 import {noopLogs} from './common'
+import {FilesNotFoundError} from '../src/internal/shared/errors'
 
 describe('upload-artifact', () => {
   beforeEach(() => {
@@ -59,7 +60,6 @@ describe('upload-artifact', () => {
       )
     jest.spyOn(blobUpload, 'uploadZipToBlobStorage').mockReturnValue(
       Promise.resolve({
-        isSuccess: true,
         uploadSize: 1234,
         sha256Hash: 'test-sha256-hash'
       })
@@ -84,7 +84,7 @@ describe('upload-artifact', () => {
       '/home/user/files/plz-upload'
     )
 
-    expect(uploadResp).resolves.toEqual({success: true, size: 1234, id: 1})
+    expect(uploadResp).resolves.toEqual({size: 1234, id: 1})
   })
 
   it('should throw an error if the root directory is invalid', () => {
@@ -107,7 +107,7 @@ describe('upload-artifact', () => {
     expect(uploadResp).rejects.toThrow('Invalid root directory')
   })
 
-  it('should return false if there are no files to upload', () => {
+  it('should reject if there are no files to upload', () => {
     jest
       .spyOn(uploadZipSpecification, 'validateRootDirectory')
       .mockReturnValue()
@@ -124,7 +124,7 @@ describe('upload-artifact', () => {
       ],
       '/home/user/files/plz-upload'
     )
-    expect(uploadResp).resolves.toEqual({success: false})
+    expect(uploadResp).rejects.toThrowError(FilesNotFoundError)
   })
 
   it('should reject if no backend IDs are found', () => {
@@ -217,7 +217,7 @@ describe('upload-artifact', () => {
       '/home/user/files/plz-upload'
     )
 
-    expect(uploadResp).resolves.toEqual({success: false})
+    expect(uploadResp).rejects.toThrow()
   })
 
   it('should return false if blob storage upload is unsuccessful', () => {
@@ -262,7 +262,7 @@ describe('upload-artifact', () => {
       )
     jest
       .spyOn(blobUpload, 'uploadZipToBlobStorage')
-      .mockReturnValue(Promise.resolve({isSuccess: false}))
+      .mockReturnValue(Promise.reject(new Error('boom')))
 
     // ArtifactHttpClient mocks
     jest.spyOn(config, 'getRuntimeToken').mockReturnValue('test-token')
@@ -280,10 +280,10 @@ describe('upload-artifact', () => {
       '/home/user/files/plz-upload'
     )
 
-    expect(uploadResp).resolves.toEqual({success: false})
+    expect(uploadResp).rejects.toThrow()
   })
 
-  it('should return false if finalize artifact fails', () => {
+  it('should reject if finalize artifact fails', () => {
     const mockDate = new Date('2020-01-01')
     jest
       .spyOn(uploadZipSpecification, 'validateRootDirectory')
@@ -325,7 +325,6 @@ describe('upload-artifact', () => {
       )
     jest.spyOn(blobUpload, 'uploadZipToBlobStorage').mockReturnValue(
       Promise.resolve({
-        isSuccess: true,
         uploadSize: 1234,
         sha256Hash: 'test-sha256-hash'
       })
@@ -350,6 +349,6 @@ describe('upload-artifact', () => {
       '/home/user/files/plz-upload'
     )
 
-    expect(uploadResp).resolves.toEqual({success: false})
+    expect(uploadResp).rejects.toThrow()
   })
 })
diff --git a/packages/artifact/src/artifact.ts b/packages/artifact/src/artifact.ts
index 5742b32d..3ba38448 100644
--- a/packages/artifact/src/artifact.ts
+++ b/packages/artifact/src/artifact.ts
@@ -4,6 +4,7 @@ import {ArtifactClient, Client} from './internal/client'
  * Exported functionality that we want to expose for any users of @actions/artifact
  */
 export * from './internal/shared/interfaces'
+export * from './internal/shared/errors'
 export {ArtifactClient}
 
 export function create(): ArtifactClient {
diff --git a/packages/artifact/src/internal/client.ts b/packages/artifact/src/internal/client.ts
index 45ba0bfe..4dd40b84 100644
--- a/packages/artifact/src/internal/client.ts
+++ b/packages/artifact/src/internal/client.ts
@@ -17,6 +17,7 @@ import {
 } from './download/download-artifact'
 import {getArtifactPublic, getArtifactInternal} from './find/get-artifact'
 import {listArtifactsPublic, listArtifactsInternal} from './find/list-artifacts'
+import {GHESNotSupportedError} from './shared/errors'
 
 export interface ArtifactClient {
   /**
@@ -52,6 +53,7 @@ export interface ArtifactClient {
   /**
    * Finds an artifact by name.
    * If there are multiple artifacts with the same name in the same workflow run, this will return the latest.
+   * If the artifact is not found, it will throw.
    *
    * If options.findBy is specified, this will use the public List Artifacts API with a name filter which can get artifacts from other runs.
    * https://docs.github.com/en/rest/actions/artifacts?apiVersion=2022-11-28#list-workflow-run-artifacts
@@ -99,16 +101,11 @@ export class Client implements ArtifactClient {
     rootDirectory: string,
     options?: UploadArtifactOptions
   ): Promise<UploadArtifactResponse> {
-    if (isGhes()) {
-      warning(
-        `@actions/artifact v2.0.0+ and upload-artifact@v4+ are not currently supported on GHES.`
-      )
-      return {
-        success: false
-      }
-    }
-
     try {
+      if (isGhes()) {
+        throw new GHESNotSupportedError()
+      }
+
       return uploadArtifact(name, files, rootDirectory, options)
     } catch (error) {
       warning(
@@ -118,9 +115,8 @@ Errors can be temporary, so please try again and optionally run the action with
 
 If the error persists, please check whether Actions is operating normally at [https://githubstatus.com](https://www.githubstatus.com).`
       )
-      return {
-        success: false
-      }
+
+      throw error
     }
   }
 
@@ -131,16 +127,11 @@ If the error persists, please check whether Actions is operating normally at [ht
     artifactId: number,
     options?: DownloadArtifactOptions & FindOptions
   ): Promise<DownloadArtifactResponse> {
-    if (isGhes()) {
-      warning(
-        `@actions/artifact v2.0.0+ and download-artifact@v4+ are not currently supported on GHES.`
-      )
-      return {
-        success: false
-      }
-    }
-
     try {
+      if (isGhes()) {
+        throw new GHESNotSupportedError()
+      }
+
       if (options?.findBy) {
         const {
           findBy: {repositoryOwner, repositoryName, token},
@@ -159,16 +150,14 @@ If the error persists, please check whether Actions is operating normally at [ht
       return downloadArtifactInternal(artifactId, options)
     } catch (error) {
       warning(
-        `Artifact download failed with error: ${error}.
+        `Download Artifact failed with error: ${error}.
 
 Errors can be temporary, so please try again and optionally run the action with debug mode enabled for more information.
 
 If the error persists, please check whether Actions and API requests are operating normally at [https://githubstatus.com](https://www.githubstatus.com).`
       )
 
-      return {
-        success: false
-      }
+      throw error
     }
   }
 
@@ -178,16 +167,11 @@ If the error persists, please check whether Actions and API requests are operati
   async listArtifacts(
     options?: ListArtifactsOptions & FindOptions
   ): Promise<ListArtifactsResponse> {
-    if (isGhes()) {
-      warning(
-        `@actions/artifact v2.0.0+ and download-artifact@v4+ are not currently supported on GHES.`
-      )
-      return {
-        artifacts: []
-      }
-    }
-
     try {
+      if (isGhes()) {
+        throw new GHESNotSupportedError()
+      }
+
       if (options?.findBy) {
         const {
           findBy: {workflowRunId, repositoryOwner, repositoryName, token}
@@ -212,9 +196,7 @@ Errors can be temporary, so please try again and optionally run the action with
 If the error persists, please check whether Actions and API requests are operating normally at [https://githubstatus.com](https://www.githubstatus.com).`
       )
 
-      return {
-        artifacts: []
-      }
+      throw error
     }
   }
 
@@ -225,16 +207,11 @@ If the error persists, please check whether Actions and API requests are operati
     artifactName: string,
     options?: FindOptions
   ): Promise<GetArtifactResponse> {
-    if (isGhes()) {
-      warning(
-        `@actions/artifact v2.0.0+ and download-artifact@v4+ are not currently supported on GHES.`
-      )
-      return {
-        success: false
-      }
-    }
-
     try {
+      if (isGhes()) {
+        throw new GHESNotSupportedError()
+      }
+
       if (options?.findBy) {
         const {
           findBy: {workflowRunId, repositoryOwner, repositoryName, token}
@@ -252,15 +229,13 @@ If the error persists, please check whether Actions and API requests are operati
       return getArtifactInternal(artifactName)
     } catch (error: unknown) {
       warning(
-        `Fetching Artifact failed with error: ${error}.
+        `Get Artifact failed with error: ${error}.
 
 Errors can be temporary, so please try again and optionally run the action with debug mode enabled for more information.
 
 If the error persists, please check whether Actions and API requests are operating normally at [https://githubstatus.com](https://www.githubstatus.com).`
       )
-      return {
-        success: false
-      }
+      throw error
     }
   }
 }
diff --git a/packages/artifact/src/internal/download/download-artifact.ts b/packages/artifact/src/internal/download/download-artifact.ts
index cf5b5e15..3bb3de61 100644
--- a/packages/artifact/src/internal/download/download-artifact.ts
+++ b/packages/artifact/src/internal/download/download-artifact.ts
@@ -16,6 +16,7 @@ import {
   ListArtifactsRequest
 } from '../../generated'
 import {getBackendIdsFromToken} from '../shared/util'
+import {ArtifactNotFoundError} from '../shared/errors'
 
 const scrubQueryParameters = (url: string): string => {
   const parsed = new URL(url)
@@ -95,7 +96,7 @@ export async function downloadArtifactPublic(
     throw new Error(`Unable to download and extract artifact: ${error.message}`)
   }
 
-  return {success: true, downloadPath}
+  return {downloadPath}
 }
 
 export async function downloadArtifactInternal(
@@ -118,10 +119,9 @@ export async function downloadArtifactInternal(
   const {artifacts} = await artifactClient.ListArtifacts(listReq)
 
   if (artifacts.length === 0) {
-    core.warning(
+    throw new ArtifactNotFoundError(
       `No artifacts found for ID: ${artifactId}\nAre you trying to download from a different run? Try specifying a github-token with \`actions:read\` scope.`
     )
-    return {success: false}
   }
 
   if (artifacts.length > 1) {
@@ -148,7 +148,7 @@ export async function downloadArtifactInternal(
     throw new Error(`Unable to download and extract artifact: ${error.message}`)
   }
 
-  return {success: true, downloadPath}
+  return {downloadPath}
 }
 
 async function resolveOrCreateDirectory(
diff --git a/packages/artifact/src/internal/find/get-artifact.ts b/packages/artifact/src/internal/find/get-artifact.ts
index 91c85818..b19e5d6e 100644
--- a/packages/artifact/src/internal/find/get-artifact.ts
+++ b/packages/artifact/src/internal/find/get-artifact.ts
@@ -10,6 +10,7 @@ import {getBackendIdsFromToken} from '../shared/util'
 import {getUserAgentString} from '../shared/user-agent'
 import {internalArtifactTwirpClient} from '../shared/artifact-twirp-client'
 import {ListArtifactsRequest, StringValue, Timestamp} from '../../generated'
+import {ArtifactNotFoundError, InvalidResponseError} from '../shared/errors'
 
 export async function getArtifactPublic(
   artifactName: string,
@@ -41,17 +42,15 @@ export async function getArtifactPublic(
   )
 
   if (getArtifactResp.status !== 200) {
-    core.warning(`non-200 response from GitHub API: ${getArtifactResp.status}`)
-    return {
-      success: false
-    }
+    throw new InvalidResponseError(
+      `Invalid response from GitHub API: ${getArtifactResp.status} (${getArtifactResp?.headers?.['x-github-request-id']})`
+    )
   }
 
   if (getArtifactResp.data.artifacts.length === 0) {
-    core.warning('no artifacts found')
-    return {
-      success: false
-    }
+    throw new ArtifactNotFoundError(
+      `Artifact not found for name: ${artifactName}`
+    )
   }
 
   let artifact = getArtifactResp.data.artifacts[0]
@@ -63,7 +62,6 @@ export async function getArtifactPublic(
   }
 
   return {
-    success: true,
     artifact: {
       name: artifact.name,
       id: artifact.id,
@@ -90,10 +88,9 @@ export async function getArtifactInternal(
   const res = await artifactClient.ListArtifacts(req)
 
   if (res.artifacts.length === 0) {
-    core.warning('no artifacts found')
-    return {
-      success: false
-    }
+    throw new ArtifactNotFoundError(
+      `Artifact not found for name: ${artifactName}`
+    )
   }
 
   let artifact = res.artifacts[0]
@@ -103,12 +100,11 @@ export async function getArtifactInternal(
     )[0]
 
     core.debug(
-      `more than one artifact found for a single name, returning newest (id: ${artifact.databaseId})`
+      `More than one artifact found for a single name, returning newest (id: ${artifact.databaseId})`
     )
   }
 
   return {
-    success: true,
     artifact: {
       name: artifact.name,
       id: Number(artifact.databaseId),
diff --git a/packages/artifact/src/internal/shared/errors.ts b/packages/artifact/src/internal/shared/errors.ts
new file mode 100644
index 00000000..a46a01ff
--- /dev/null
+++ b/packages/artifact/src/internal/shared/errors.ts
@@ -0,0 +1,37 @@
+export class FilesNotFoundError extends Error {
+  files: string[]
+
+  constructor(files: string[] = []) {
+    let message = 'No files were found to upload'
+    if (files.length > 0) {
+      message += `: ${files.join(', ')}`
+    }
+
+    super(message)
+    this.files = files
+    this.name = 'FilesNotFoundError'
+  }
+}
+
+export class InvalidResponseError extends Error {
+  constructor(message: string) {
+    super(message)
+    this.name = 'InvalidResponseError'
+  }
+}
+
+export class ArtifactNotFoundError extends Error {
+  constructor(message = 'Artifact not found') {
+    super(message)
+    this.name = 'ArtifactNotFoundError'
+  }
+}
+
+export class GHESNotSupportedError extends Error {
+  constructor(
+    message = '@actions/artifact v2.0.0+ and download-artifact@v4+ are not currently supported on GHES.'
+  ) {
+    super(message)
+    this.name = 'GHESNotSupportedError'
+  }
+}
diff --git a/packages/artifact/src/internal/shared/interfaces.ts b/packages/artifact/src/internal/shared/interfaces.ts
index 61994b2b..dfd3e1da 100644
--- a/packages/artifact/src/internal/shared/interfaces.ts
+++ b/packages/artifact/src/internal/shared/interfaces.ts
@@ -4,11 +4,6 @@
  *                                                                           *
  *****************************************************************************/
 export interface UploadArtifactResponse {
-  /**
-   * Denotes if an artifact was successfully uploaded
-   */
-  success: boolean
-
   /**
    * Total size of the artifact in bytes. Not provided if no artifact was uploaded
    */
@@ -58,15 +53,10 @@ export interface UploadArtifactOptions {
  *****************************************************************************/
 
 export interface GetArtifactResponse {
-  /**
-   * If an artifact was found
-   */
-  success: boolean
-
   /**
    * Metadata about the artifact that was found
    */
-  artifact?: Artifact
+  artifact: Artifact
 }
 
 /*****************************************************************************
@@ -96,10 +86,6 @@ export interface ListArtifactsResponse {
  *                                                                           *
  *****************************************************************************/
 export interface DownloadArtifactResponse {
-  /**
-   * If the artifact download was successful
-   */
-  success: boolean
   /**
    * The path where the artifact was downloaded to
    */
diff --git a/packages/artifact/src/internal/upload/blob-upload.ts b/packages/artifact/src/internal/upload/blob-upload.ts
index cb7a11b7..59472385 100644
--- a/packages/artifact/src/internal/upload/blob-upload.ts
+++ b/packages/artifact/src/internal/upload/blob-upload.ts
@@ -7,11 +7,6 @@ import * as crypto from 'crypto'
 import * as stream from 'stream'
 
 export interface BlobUploadResponse {
-  /**
-   * If the upload was successful or not
-   */
-  isSuccess: boolean
-
   /**
    * The total reported upload size in bytes. Empty if the upload failed
    */
@@ -55,41 +50,28 @@ export async function uploadZipToBlobStorage(
   zipUploadStream.pipe(uploadStream) // This stream is used for the upload
   zipUploadStream.pipe(hashStream).setEncoding('hex') // This stream is used to compute a hash of the zip content that gets used. Integrity check
 
-  try {
-    core.info('Beginning upload of artifact content to blob storage')
+  core.info('Beginning upload of artifact content to blob storage')
 
-    await blockBlobClient.uploadStream(
-      uploadStream,
-      bufferSize,
-      maxConcurrency,
-      options
-    )
+  await blockBlobClient.uploadStream(
+    uploadStream,
+    bufferSize,
+    maxConcurrency,
+    options
+  )
 
-    core.info('Finished uploading artifact content to blob storage!')
+  core.info('Finished uploading artifact content to blob storage!')
 
-    hashStream.end()
-    sha256Hash = hashStream.read() as string
-    core.info(`SHA256 hash of uploaded artifact zip is ${sha256Hash}`)
-  } catch (error) {
-    core.warning(
-      `Failed to upload artifact zip to blob storage, error: ${error}`
-    )
-    return {
-      isSuccess: false
-    }
-  }
+  hashStream.end()
+  sha256Hash = hashStream.read() as string
+  core.info(`SHA256 hash of uploaded artifact zip is ${sha256Hash}`)
 
   if (uploadByteCount === 0) {
     core.warning(
-      `No data was uploaded to blob storage. Reported upload byte count is 0`
+      `No data was uploaded to blob storage. Reported upload byte count is 0.`
     )
-    return {
-      isSuccess: false
-    }
   }
 
   return {
-    isSuccess: true,
     uploadSize: uploadByteCount,
     sha256Hash
   }
diff --git a/packages/artifact/src/internal/upload/upload-artifact.ts b/packages/artifact/src/internal/upload/upload-artifact.ts
index 6546f98f..55921252 100644
--- a/packages/artifact/src/internal/upload/upload-artifact.ts
+++ b/packages/artifact/src/internal/upload/upload-artifact.ts
@@ -19,6 +19,7 @@ import {
   FinalizeArtifactRequest,
   StringValue
 } from '../../generated'
+import {FilesNotFoundError, InvalidResponseError} from '../shared/errors'
 
 export async function uploadArtifact(
   name: string,
@@ -34,10 +35,9 @@ export async function uploadArtifact(
     rootDirectory
   )
   if (zipSpecification.length === 0) {
-    core.warning(`No files were found to upload`)
-    return {
-      success: false
-    }
+    throw new FilesNotFoundError(
+      zipSpecification.flatMap(s => (s.sourcePath ? [s.sourcePath] : []))
+    )
   }
 
   const zipUploadStream = await createZipUploadStream(
@@ -68,10 +68,9 @@ export async function uploadArtifact(
   const createArtifactResp =
     await artifactClient.CreateArtifact(createArtifactReq)
   if (!createArtifactResp.ok) {
-    core.warning(`Failed to create artifact`)
-    return {
-      success: false
-    }
+    throw new InvalidResponseError(
+      'CreateArtifact: response from backend was not ok'
+    )
   }
 
   // Upload zip to blob storage
@@ -79,11 +78,6 @@ export async function uploadArtifact(
     createArtifactResp.signedUploadUrl,
     zipUploadStream
   )
-  if (uploadResult.isSuccess === false) {
-    return {
-      success: false
-    }
-  }
 
   // finalize the artifact
   const finalizeArtifactReq: FinalizeArtifactRequest = {
@@ -104,10 +98,9 @@ export async function uploadArtifact(
   const finalizeArtifactResp =
     await artifactClient.FinalizeArtifact(finalizeArtifactReq)
   if (!finalizeArtifactResp.ok) {
-    core.warning(`Failed to finalize artifact`)
-    return {
-      success: false
-    }
+    throw new InvalidResponseError(
+      'FinalizeArtifact: response from backend was not ok'
+    )
   }
 
   const artifactId = BigInt(finalizeArtifactResp.artifactId)
@@ -116,7 +109,6 @@ export async function uploadArtifact(
   )
 
   return {
-    success: true,
     size: uploadResult.uploadSize,
     id: Number(artifactId)
   }