diff --git a/.cm/gitstream.cm b/.cm/gitstream.cm
new file mode 100644
index 0000000..9eec379
--- /dev/null
+++ b/.cm/gitstream.cm
@@ -0,0 +1,43 @@
+# code: language=jinja-yaml insertSpaces=true tabSize=2
+
+manifest:
+  version: 1.0
+
+automations:
+  estimated_time_to_review:
+    if:
+      - true
+    run:
+      - action: add-label@v1
+        args:
+          label: "{{ calc.etr }} min review"
+          color: {{ colors.red if (calc.etr >= 20) else ( colors.yellow if (calc.etr >= 5) else colors.green ) }}
+
+  percent_new_code:
+    if:
+      - true
+    run:
+      - action: add-comment@v1
+        args:
+          comment: |
+            This PR is {{ changes.ratio }}% new code.
+
+# custom expressions
+
+# https://docs.gitstream.cm/filter-functions/#estimatedreviewtime
+calc:
+  etr: {{ branch | estimatedReviewTime }}
+
+changes:
+  additions: {{ branch.diff.files_metadata | map(attr='additions') | sum }}
+  deletions: {{ branch.diff.files_metadata | map(attr='deletions') | sum }}
+  ratio: {{ (changes.additions / (changes.additions + changes.deletions)) * 100 | round(2) }}
+
+# These are all of the colors in GitHub's default label color palette.
+colors:
+  red: 'b60205'
+  orange: 'd93f0b'
+  yellow: 'fbca04'
+  green: '0e8a16'
+  blue: '1d76db'
+  purple: '5319e7'
diff --git a/.github/workflows/gitstream.yml b/.github/workflows/gitstream.yml
new file mode 100644
index 0000000..2349908
--- /dev/null
+++ b/.github/workflows/gitstream.yml
@@ -0,0 +1,47 @@
+# code: language=yaml insertSpaces=true tabSize=2
+name: gitStream
+run-name: |
+  /:\ gitStream: PR #${{ fromJSON(fromJSON(github.event.inputs.client_payload)).pullRequestNumber }} from ${{ github.event.inputs.full_repository }}
+
+on:
+  workflow_dispatch:
+    inputs:
+      client_payload:
+        description: The client payload.
+        required: true
+      full_repository:
+        description: The repository name, including the owner name.
+        required: true
+      head_ref:
+        description: A ref to the head commit.
+        required: true
+      base_ref:
+        description: A ref to the base commit.
+        required: true
+      installation_id:
+        description: The GitHub App installation ID.
+        required: false
+      resolver_url:
+        description: The resolver URL to pass results to.
+        required: true
+      resolver_token:
+        description: Optional resolver token for the resolver service.
+        required: false
+        default: ""
+
+jobs:
+  gitStream:
+    runs-on: ubuntu-latest
+    timeout-minutes: 5
+    steps:
+      - name: Evaluate Rules
+        id: rules-engine
+        uses: linear-b/gitstream-github-action@v2
+        with:
+          full_repository: ${{ github.event.inputs.full_repository }}
+          head_ref: ${{ github.event.inputs.head_ref }}
+          base_ref: ${{ github.event.inputs.base_ref }}
+          client_payload: ${{ github.event.inputs.client_payload }}
+          installation_id: ${{ github.event.inputs.installation_id }}
+          resolver_url: ${{ github.event.inputs.resolver_url }}
+          resolver_token: ${{ github.event.inputs.resolver_token }}