diff --git a/.github/workflows/rusty-v8-bazel-build.yml b/.github/workflows/rusty-v8-bazel-build.yml
index 79d1f0b92a..f3abe10f4f 100644
--- a/.github/workflows/rusty-v8-bazel-build.yml
+++ b/.github/workflows/rusty-v8-bazel-build.yml
@@ -10,6 +10,7 @@ on:
       - ".github/scripts/rusty_v8_bazel.py"
       - "MODULE.bazel"
       - "MODULE.bazel.lock"
+      - "codex-rs/v8-poc/**"
       - "patches/**"
       - "third_party/v8/**"
       - "**/*.bzl"
@@ -26,6 +27,7 @@ on:
       - ".github/scripts/rusty_v8_bazel.py"
       - "MODULE.bazel"
       - "MODULE.bazel.lock"
+      - "codex-rs/v8-poc/**"
       - "patches/**"
       - "third_party/v8/**"
       - "**/*.bzl"
@@ -173,6 +175,25 @@ jobs:
           path: dist/${{ matrix.target }}
           key: ${{ steps.cache_key.outputs.key }}
 
+      - name: Build codex-v8-poc against staged bundle
+        env:
+          PLATFORM: ${{ matrix.platform }}
+          TARGET: ${{ matrix.target }}
+        shell: bash
+        run: |
+          set -euo pipefail
+
+          eval "$(python3 .github/scripts/rusty_v8_bazel.py print-cargo-env \
+            --platform "${PLATFORM}" \
+            --target "${TARGET}" \
+            --output-dir "dist/${TARGET}")"
+
+          cargo test \
+            --manifest-path codex-rs/v8-poc/Cargo.toml \
+            --locked \
+            --lib \
+            --target "${TARGET}"
+
       - name: Upload staged artifacts
         uses: actions/upload-artifact@v7
         with:
diff --git a/codex-rs/v8-poc/.gitignore b/codex-rs/v8-poc/.gitignore
new file mode 100644
index 0000000000..2f7896d1d1
--- /dev/null
+++ b/codex-rs/v8-poc/.gitignore
@@ -0,0 +1 @@
+target/
diff --git a/codex-rs/v8-poc/Cargo.lock b/codex-rs/v8-poc/Cargo.lock
new file mode 100644
index 0000000000..2a23f9e01e
--- /dev/null
+++ b/codex-rs/v8-poc/Cargo.lock
@@ -0,0 +1,870 @@
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diff --git a/codex-rs/v8-poc/Cargo.toml b/codex-rs/v8-poc/Cargo.toml
new file mode 100644
index 0000000000..b63dac51ed
--- /dev/null
+++ b/codex-rs/v8-poc/Cargo.toml
@@ -0,0 +1,18 @@
+[package]
+name = "codex-v8-poc"
+version = "0.0.0"
+edition = "2024"
+license = "Apache-2.0"
+publish = false
+
+[workspace]
+resolver = "2"
+
+[lib]
+doctest = false
+name = "codex_v8_poc"
+path = "src/lib.rs"
+
+[dependencies]
+# Keep this in sync with the v8 crate pinned in MODULE.bazel.
+v8 = "=146.4.0"
diff --git a/codex-rs/v8-poc/src/lib.rs b/codex-rs/v8-poc/src/lib.rs
new file mode 100644
index 0000000000..ca09fc133b
--- /dev/null
+++ b/codex-rs/v8-poc/src/lib.rs
@@ -0,0 +1,45 @@
+use std::sync::Once;
+
+static V8_INIT: Once = Once::new();
+
+fn init_v8() {
+    V8_INIT.call_once(|| {
+        let platform = v8::new_default_platform(0, false).make_shared();
+        v8::V8::initialize_platform(platform);
+        v8::V8::initialize();
+    });
+}
+
+pub fn evaluate_integer_expression(source: &str) -> Result<i64, String> {
+    init_v8();
+
+    let isolate = &mut v8::Isolate::new(v8::CreateParams::default());
+    v8::scope!(let handle_scope, isolate);
+    let context = v8::Context::new(handle_scope, Default::default());
+    let scope = &mut v8::ContextScope::new(handle_scope, context);
+    let code = v8::String::new(scope, source)
+        .ok_or_else(|| "failed to allocate JavaScript source".to_string())?;
+    let script = v8::Script::compile(scope, code, None)
+        .ok_or_else(|| "failed to compile JavaScript source".to_string())?;
+    let result = script
+        .run(scope)
+        .ok_or_else(|| "failed to execute JavaScript source".to_string())?;
+
+    result
+        .integer_value(scope)
+        .ok_or_else(|| "JavaScript expression did not evaluate to an integer".to_string())
+}
+
+pub fn smoke_value() -> Result<i64, String> {
+    evaluate_integer_expression("1 + 2")
+}
+
+#[cfg(test)]
+mod tests {
+    use super::smoke_value;
+
+    #[test]
+    fn evaluates_smoke_expression() {
+        assert_eq!(smoke_value().unwrap(), 3);
+    }
+}