diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 25ebc09..3921027 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -69,31 +69,3 @@ jobs:
           github-token: ${{ secrets.GITHUB_TOKEN }}
       - name: Dump output
         run: jq < ${{ steps.attest-sbom.outputs.bundle-path }}
-  test-attest-sbom:
-    name: Test attest-sbom action
-    runs-on: ubuntu-latest
-    permissions:
-      contents: write
-      id-token: write
-
-    steps:
-      - name: Checkout
-        id: checkout
-        uses: actions/checkout@b4ffde65f46336ab88eb53be808477a3936bae11 # v4.1.1
-      - name: Run attest-sbom with spdx format
-        uses: ./
-        with:
-          subject-digest: 'sha256:7d070f6b64d9bcc530fe99cc21eaaa4b3c364e0b2d367d7735671fa202a03b32'
-          subject-name: 'subject'
-          github-token: ${{ secrets.GITHUB_TOKEN }}
-          sbom-format: 'spdx'
-      - name: Run attest-sbom with cyclonedx format
-        id: attest-sbom
-        uses: ./
-        env:
-          INPUT_PRIVATE-SIGNING: 'true'
-        with:
-          subject-digest: 'sha256:7d070f6b64d9bcc530fe99cc21eaaa4b3c364e0b2d367d7735671fa202a03b32'
-          subject-name: 'subject'
-          github-token: ${{ secrets.GITHUB_TOKEN }}
-          sbom-format: 'cyclonedx'
diff --git a/README.md b/README.md
index a1fdec6..ee8c1ee 100644
--- a/README.md
+++ b/README.md
@@ -5,9 +5,8 @@ the [@actions/attest][1] package.
 
 Attestations bind some subject (a named artifact along with its digest) to a a
 Software Bill of Materials (SBOM) using the [in-toto][2] format. The action
-accepts SBOMs which have been generated by external tools or can generate one
-automatically by invoking the [anchore/sbom-action][3]. Externally generated
-SBOMs must be in either the [SPDX][4] or [CycloneDX][5] JSON-serialized format.
+accepts SBOMs which have been generated by external tools. Provided SBOMs must
+be in either the [SPDX][4] or [CycloneDX][5] JSON-serialized format.
 
 A verifiable signature is generated for the attestation using a short-lived
 [Sigstore][6]-issued signing certificate. If the repository initiating the
@@ -45,12 +44,12 @@ attest:
    - uses: actions/attest-sbom@v1
      with:
        subject-path: '<PATH TO ARTIFACT>'
+       sbom-path: '<PATH TO SBOM>'
    ```
 
    The `subject-path` parameter should identity the artifact for which you want
-   to generate an SBOM attestation. When no other inputs are specified, the
-   action will automatically generate an SPDX SBOM by scanning the
-   `github.workspace` directory.
+   to generate an SBOM attestation. The `sbom-path` parameter should identify
+   the SBOM document to be associated with the subject.
 
 ### Inputs
 
@@ -77,15 +76,6 @@ See [action.yml](action.yml)
     # "scan-path" and "sbom-format" inputs are ignored.
     sbom-path:
 
-    # Path on the filesystem to scan for SBOM generation. Ignored if "sbom-path"
-    # is specified. Defaults to ${{ github.workspace }}
-    scan-path:
-
-    # Format to use for the generated SBOM output. Supported formats are
-    # "spdx" and "cyclonedx". Ignored if "sbom-path" is specified. Defaults to
-    # "spdx".
-    sbom-format:
-
     # Whether to push the attestation to the image registry. Requires that the
     # "subject-name" parameter specify the fully-qualified image name and that
     # the "subject-digest" parameter be specified. Defaults to false.
diff --git a/action.yml b/action.yml
index 179b9e6..e8efc83 100644
--- a/action.yml
+++ b/action.yml
@@ -24,18 +24,6 @@ inputs:
       Path to the JSON-formatted SBOM file to attest. When specified, the
       "scan-path" and "sbom-format" inputs are ignored.
     required: false
-  scan-path:
-    description: >
-      Path on the filesystem to scan for SBOM generation. Ignored if "sbom-path"
-      is specified.
-    default: ${{ github.workspace }}
-    required: false
-  sbom-format:
-    description: >
-      Format to use for the generated SBOM output. Supported formats are "spdx"
-      and "cyclonedx". Ignored if "sbom-path" is specified.
-    default: 'spdx'
-    required: false
   push-to-registry:
     description: >
       Whether to push the provenance statement to the image registry. Requires
@@ -57,32 +45,6 @@ outputs:
 runs:
   using: 'composite'
   steps:
-    - name: Generate random SBOM output file name
-      if: inputs.sbom-path == ''
-      id: sbom-output
-      run:
-        echo "path=${{ runner.temp }}/sbom_$(openssl rand -hex 6).json" >> $GITHUB_OUTPUT
-      shell: bash
-    - name: SBOM format check
-      id: check-sbom-format
-      if: inputs.sbom-path == ''
-      run: |
-        if [ "${{inputs.sbom-format}}" != "spdx" ] && [ "${{inputs.sbom-format}}" != "cyclonedx" ] ]; then
-          echo "Invalid SBOM format. Supported formats are spdx and cyclonedx."
-          exit 1
-        elif [ "${{inputs.sbom-format}}" == "spdx" ]; then
-          echo "format=spdx-json" >> $GITHUB_OUTPUT
-        elif [ "${{inputs.sbom-format}}" == "cyclonedx" ]; then
-          echo "format=cyclonedx-json" >> $GITHUB_OUTPUT
-        fi
-      shell: bash
-    - name: Generate SBOM
-      if: inputs.sbom-path == ''
-      uses: anchore/sbom-action@ab5d7b5f48981941c4c5d6bf33aeb98fe3bae38c # v0.15.10
-      with:
-        path: ${{ inputs.scan-path }}
-        output-file: ${{ steps.sbom-output.outputs.path }}
-        format: ${{ steps.check-sbom-format.outputs.format }}
     - uses: actions/attest-sbom/predicate@847c6befa7ce187c962fa6c3e6cd3c96e4da9565 # predicate@0.1.0
       id: generate-sbom-predicate
       with: