diff --git a/.github/actions/build-codex-packages/action.yml b/.github/actions/build-codex-packages/action.yml
new file mode 100644
index 0000000000..ac1bd2ea54
--- /dev/null
+++ b/.github/actions/build-codex-packages/action.yml
@@ -0,0 +1,300 @@
+name: build-codex-packages
+description: Build and smoke-test unsigned Codex CLI and app-server release packages.
+inputs:
+  target:
+    description: Rust release target triple to build and test.
+    required: true
+  package-version:
+    description: Semantic version to record in both packages.
+    required: true
+  build-mode:
+    description: Use release optimizations (release) or disable them for faster smoke coverage (debug).
+    required: true
+
+# Resolve package sources relative to the action so it works in both repository layouts.
+runs:
+  using: composite
+  steps:
+    - name: Select release binaries
+      shell: bash
+      working-directory: codex-rs
+      env:
+        BASE_BINARIES: "codex codex-app-server codex-code-mode-host"
+        WINDOWS_ONLY_BINARIES: "codex-command-runner codex-windows-sandbox-setup"
+        BUILD_MODE: ${{ inputs.build-mode }}
+        # macOS symbol extraction needs packed dSYM bundles before binaries are stripped.
+        CARGO_PROFILE_RELEASE_SPLIT_DEBUGINFO: ${{ contains(inputs.target, 'apple-darwin') && 'packed' || 'off' }}
+      run: |
+        set -euo pipefail
+        needed_binaries="$BASE_BINARIES"
+        if [[ "$RUNNER_OS" == "Windows" ]]; then
+          needed_binaries+=" $WINDOWS_ONLY_BINARIES"
+        fi
+        echo "NEEDED_BINARIES=$needed_binaries" >> "$GITHUB_ENV"
+        echo "CARGO_PROFILE_RELEASE_SPLIT_DEBUGINFO=$CARGO_PROFILE_RELEASE_SPLIT_DEBUGINFO" >> "$GITHUB_ENV"
+        case "$BUILD_MODE" in
+          release) ;;
+          debug)
+            # Use the release profile so assertions, symbols and packaging match production.
+            # Only trade compiler optimizations for faster builds.
+            {
+              echo "CARGO_PROFILE_RELEASE_OPT_LEVEL=0"
+              echo "CARGO_PROFILE_RELEASE_LTO=off"
+              echo "CARGO_PROFILE_RELEASE_CODEGEN_UNITS=256"
+            } >> "$GITHUB_ENV"
+            ;;
+          *) echo "Unsupported build mode: $BUILD_MODE" >&2; exit 1 ;;
+        esac
+
+    - uses: ./.github/actions/setup-ci
+
+    - name: Set up Python 3.12
+      uses: actions/setup-python@a309ff8b426b58ec0e2a45f0f869d46889d02405 # v6.2.0
+      with:
+        python-version: "3.12"
+
+    - name: Install uv
+      uses: astral-sh/setup-uv@08807647e7069bb48b6ef5acd8ec9567f424441b # v8.1.0
+      with:
+        version: "0.11.3"
+
+    - name: Install Linux build dependencies
+      if: ${{ runner.os == 'Linux' }}
+      shell: bash
+      working-directory: codex-rs
+      run: |
+        set -euo pipefail
+        sudo apt-get update -y
+        sudo DEBIAN_FRONTEND=noninteractive apt-get install -y --no-install-recommends binutils make pkg-config libcap-dev
+
+    - uses: dtolnay/rust-toolchain@e081816240890017053eacbb1bdf337761dc5582 # 1.95.0
+      with:
+        targets: ${{ inputs.target }}
+
+    - name: Use hermetic Cargo home (musl)
+      if: ${{ runner.os == 'Linux' }}
+      shell: bash
+      working-directory: codex-rs
+      run: |
+        set -euo pipefail
+        cargo_home="${GITHUB_WORKSPACE}/.cargo-home"
+        mkdir -p "${cargo_home}/bin"
+        echo "CARGO_HOME=${cargo_home}" >> "$GITHUB_ENV"
+        echo "${cargo_home}/bin" >> "$GITHUB_PATH"
+        : > "${cargo_home}/config.toml"
+
+    - name: Install Zig
+      if: ${{ runner.os == 'Linux' }}
+      uses: mlugg/setup-zig@d1434d08867e3ee9daa34448df10607b98908d29 # v2.2.1
+      with:
+        version: 0.14.0
+        use-cache: false
+
+    - name: Install musl build tools
+      if: ${{ runner.os == 'Linux' }}
+      shell: bash
+      working-directory: codex-rs
+      env:
+        TARGET: ${{ inputs.target }}
+      run: bash "${GITHUB_WORKSPACE}/.github/scripts/install-musl-build-tools.sh"
+
+    - name: Disable aws-lc jitter entropy (musl)
+      if: ${{ runner.os == 'Linux' }}
+      shell: bash
+      working-directory: codex-rs
+      env:
+        TARGET: ${{ inputs.target }}
+      run: |
+        set -euo pipefail
+        # Match public releases: aws-lc's jitter entropy path does not work
+        # reliably on musl builders, so disable it globally and per target.
+        echo "AWS_LC_SYS_NO_JITTER_ENTROPY=1" >> "$GITHUB_ENV"
+        target_no_jitter="AWS_LC_SYS_NO_JITTER_ENTROPY_${TARGET}"
+        target_no_jitter="${target_no_jitter//-/_}"
+        echo "${target_no_jitter}=1" >> "$GITHUB_ENV"
+
+    - name: Configure rusty_v8 artifact overrides and verify checksums
+      uses: ./.github/actions/setup-rusty-v8
+      with:
+        target: ${{ inputs.target }}
+
+    - name: Configure MSVC environment
+      if: ${{ runner.os == 'Windows' }}
+      uses: ./.github/actions/setup-msvc-env
+      with:
+        target: ${{ inputs.target }}
+
+    - name: Build bwrap and export digest
+      if: ${{ runner.os == 'Linux' }}
+      shell: bash
+      working-directory: codex-rs
+      env:
+        TARGET: ${{ inputs.target }}
+      run: |
+        set -euo pipefail
+        cargo build --target "${TARGET}" --release --timings --bin bwrap
+
+        bwrap_path="${CARGO_TARGET_DIR}/${TARGET}/release/bwrap"
+        # Codex embeds this digest at build time and verifies the packaged
+        # bwrap at runtime, so hash its final stripped bytes first.
+        strip --strip-debug --strip-unneeded "$bwrap_path"
+        digest="$(sha256sum "$bwrap_path" | awk '{print $1}')"
+        echo "CODEX_BWRAP_SHA256=${digest}" >> "$GITHUB_ENV"
+
+    - name: Build Codex package binaries
+      shell: bash
+      working-directory: codex-rs
+      env:
+        TARGET: ${{ inputs.target }}
+      run: |
+        set -euo pipefail
+        build_args=()
+        for binary in $NEEDED_BINARIES; do
+          build_args+=(--bin "$binary")
+        done
+        # SQLite intrinsics can emit instructions unsupported by older x64
+        # CPUs, causing Windows release binaries to crash during startup.
+        if [[ "${TARGET}" == "x86_64-pc-windows-msvc" ]]; then
+          export LIBSQLITE3_FLAGS=SQLITE_DISABLE_INTRINSIC
+        fi
+        STABLE_GIT_COMMIT="$(git rev-parse HEAD)"
+        export STABLE_GIT_COMMIT
+        cargo build --target "${TARGET}" --release --timings "${build_args[@]}"
+
+    - name: Normalize Windows PDB filenames
+      if: ${{ runner.os == 'Windows' }}
+      shell: bash
+      working-directory: codex-rs
+      env:
+        TARGET: ${{ inputs.target }}
+      run: |
+        set -euo pipefail
+        release_dir="${CARGO_TARGET_DIR}/${TARGET}/release"
+        for binary in $NEEDED_BINARIES; do
+          expected_pdb="${release_dir}/${binary}.pdb"
+          if [[ -f "$expected_pdb" ]]; then
+            continue
+          fi
+
+          underscored_pdb="${release_dir}/${binary//-/_}.pdb"
+          if [[ ! -f "$underscored_pdb" ]]; then
+            echo "PDB for ${binary} not found at ${expected_pdb} or ${underscored_pdb}" >&2
+            exit 1
+          fi
+          cp "$underscored_pdb" "$expected_pdb"
+        done
+
+    - name: Download packaged zsh manifest
+      if: ${{ runner.os != 'Windows' }}
+      shell: bash
+      working-directory: codex-rs
+      run: |
+        set -euo pipefail
+        curl -fsSL \
+          "https://github.com/openai/codex/releases/download/codex-zsh-v0.1.0/codex-zsh" \
+          -o "${RUNNER_TEMP}/codex-zsh"
+
+    - name: Archive symbols and strip binaries
+      shell: bash
+      working-directory: codex-rs
+      env:
+        TARGET: ${{ inputs.target }}
+        PACKAGE_ACTION_PATH: ${{ github.action_path }}
+      run: |
+        set -euo pipefail
+        bash "${PACKAGE_ACTION_PATH}/../../../.github/scripts/archive-release-symbols-and-strip-binaries.sh" \
+          --target "${TARGET}" \
+          --artifact-name "${TARGET}" \
+          --release-dir "${CARGO_TARGET_DIR}/${TARGET}/release" \
+          --archive-dir "../symbols-dist/${TARGET}" \
+          --binaries "$NEEDED_BINARIES"
+
+    - name: Build Codex package archives
+      shell: bash
+      working-directory: codex-rs
+      env:
+        TARGET: ${{ inputs.target }}
+        CODEX_PACKAGE_VERSION: ${{ inputs.package-version }}
+        PACKAGE_ACTION_PATH: ${{ github.action_path }}
+      run: |
+        set -euo pipefail
+        target="${TARGET}"
+        release_dir="${CARGO_TARGET_DIR}/${target}/release"
+        archive_dir="${GITHUB_WORKSPACE}/dist/${target}"
+        exe_suffix=""
+        if [[ "$RUNNER_OS" == "Windows" ]]; then
+          exe_suffix=".exe"
+        fi
+
+        package_args=(
+          --target "$target"
+          --code-mode-host-bin "${release_dir}/codex-code-mode-host${exe_suffix}"
+          --cargo-profile release
+          --package-version "$CODEX_PACKAGE_VERSION"
+          --force
+        )
+        if [[ "$RUNNER_OS" == "Linux" ]]; then
+          package_args+=(--bwrap-bin "${release_dir}/bwrap")
+        fi
+        if [[ "$RUNNER_OS" == "Windows" ]]; then
+          package_args+=(
+            --codex-command-runner-bin "${release_dir}/codex-command-runner.exe"
+            --codex-windows-sandbox-setup-bin "${release_dir}/codex-windows-sandbox-setup.exe"
+          )
+        else
+          package_args+=(--zsh-manifest "${RUNNER_TEMP}/codex-zsh")
+        fi
+
+        python3 "${PACKAGE_ACTION_PATH}/../../../scripts/build_codex_package.py" \
+          "${package_args[@]}" \
+          --variant codex \
+          --entrypoint-bin "${release_dir}/codex${exe_suffix}" \
+          --package-dir "${RUNNER_TEMP}/codex-package-${target}" \
+          --archive-output "${archive_dir}/codex-package-${target}.tar.gz" \
+          --archive-output "${archive_dir}/codex-package-${target}.tar.zst"
+
+        python3 "${PACKAGE_ACTION_PATH}/../../../scripts/build_codex_package.py" \
+          "${package_args[@]}" \
+          --variant codex-app-server \
+          --entrypoint-bin "${release_dir}/codex-app-server${exe_suffix}" \
+          --package-dir "${RUNNER_TEMP}/codex-app-server-package-${target}" \
+          --archive-output "${archive_dir}/codex-app-server-package-${target}.tar.gz" \
+          --archive-output "${archive_dir}/codex-app-server-package-${target}.tar.zst"
+
+    - name: Smoke-test assembled packages
+      shell: bash
+      working-directory: codex-rs
+      env:
+        TARGET: ${{ inputs.target }}
+        PYTHONPATH: ${{ github.workspace }}/sdk/python/src${{ runner.os == 'Windows' && ';' || ':' }}${{ github.workspace }}/sdk/python/tests
+        PACKAGE_ACTION_PATH: ${{ github.action_path }}
+      run: |
+        set -euo pipefail
+        cd "${PACKAGE_ACTION_PATH}/../../../scripts/codex_package/smoke_tests"
+        target="${TARGET}"
+        archive_dir="${GITHUB_WORKSPACE}/dist/${target}"
+        mkdir -p "${GITHUB_WORKSPACE}/codex-rs/target"
+        pytest_args=(
+          -v
+          --basetemp "${GITHUB_WORKSPACE}/codex-rs/target/package-smoke-tmp"
+          --package-target "$target"
+          --symbols-archive "${GITHUB_WORKSPACE}/symbols-dist/${target}/codex-symbols-${target}.tar.gz"
+        )
+
+        # CI must exercise packaged tools; local smoke runs may use host tools.
+        if command -v rg || { [[ "$RUNNER_OS" == "Linux" ]] && command -v bwrap; }; then
+          echo "Host rg (or bwrap on Linux) is on PATH; CI must use packaged tools." >&2
+          exit 1
+        fi
+
+        uv run --frozen pytest "${pytest_args[@]}" \
+          --compression gzip \
+          --cli-archive "${archive_dir}/codex-package-${target}.tar.gz" \
+          --app-server-archive "${archive_dir}/codex-app-server-package-${target}.tar.gz" \
+          test_codex_package.py
+
+        uv run --frozen pytest "${pytest_args[@]}" \
+          --compression zstd \
+          --cli-archive "${archive_dir}/codex-package-${target}.tar.zst" \
+          --app-server-archive "${archive_dir}/codex-app-server-package-${target}.tar.zst" \
+          test_codex_package.py