diff --git a/.github/workflows/sims.yml b/.github/workflows/sims.yml
new file mode 100644
index 000000000..f5497bd73
--- /dev/null
+++ b/.github/workflows/sims.yml
@@ -0,0 +1,108 @@
+name: Sims
+on:
+  workflow_dispatch:
+  pull_request:
+  push:
+    branches:
+      - main
+
+concurrency:
+  group: ${{ github.workflow }}-${{ github.ref }}
+  cancel-in-progress: ${{ !contains(github.ref, 'tags/')}}
+
+jobs:
+  test-sim-nondeterminism:
+    runs-on: ubuntu-latest
+    timeout-minutes: 60
+    steps:
+      - name: Checkout 🛎️
+        uses: actions/checkout@v4
+
+      - name: Setup Go 🧰
+        uses: actions/setup-go@v5
+        with:
+          go-version: '1.23'
+
+      - name: Compute diff 📜
+        uses: technote-space/get-diff-action@v6.1.2
+        with:
+          PATTERNS: |
+            **/**.go
+            go.mod
+            go.sum
+
+      - name: Save cache 💾
+        uses: actions/cache@v4
+        with:
+          path: ~/go/bin
+          key: ${{ runner.os }}-go-runsim-binary
+        if: env.GIT_DIFF
+
+      - name: Run nondeterminism simulation 🧪
+        run: |
+          make test-sim-nondeterminism
+        if: env.GIT_DIFF
+
+  test-sim-multi-seed-short:
+    runs-on: ubuntu-latest
+    timeout-minutes: 60
+    steps:
+      - name: Checkout 🛎️
+        uses: actions/checkout@v4
+
+      - name: Setup Go 🧰
+        uses: actions/setup-go@v5
+        with:
+          go-version: '1.23'
+
+      - name: Compute diff 📜
+        uses: technote-space/get-diff-action@v6.1.2
+        with:
+          PATTERNS: |
+            **/**.go
+            go.mod
+            go.sum
+
+      - name: Save cache 💾
+        uses: actions/cache@v4
+        with:
+          path: ~/go/bin
+          key: ${{ runner.os }}-go-runsim-binary
+        if: env.GIT_DIFF
+
+      - name: Run multi-seed-short simulation 🧪
+        run: |
+          make test-sim-multi-seed-short
+        if: env.GIT_DIFF
+
+  test-sim-import-export:
+    runs-on: ubuntu-latest
+    timeout-minutes: 60
+    steps:
+      - name: Checkout 🛎️
+        uses: actions/checkout@v4
+
+      - name: Setup Go 🧰
+        uses: actions/setup-go@v5
+        with:
+          go-version: '1.23'
+
+      - name: Compute diff 📜
+        uses: technote-space/get-diff-action@v6.1.2
+        with:
+          PATTERNS: |
+            **/**.go
+            go.mod
+            go.sum
+
+      - name: Save cache 💾
+        uses: actions/cache@v4
+        with:
+          path: ~/go/bin
+          key: ${{ runner.os }}-go-runsim-binary
+        if: env.GIT_DIFF
+
+      - name: Run import-export simulation 🧪
+        run: |
+          make test-sim-import-export
+        if: env.GIT_DIFF