diff --git a/.github/workflows/build_binary.yml b/.github/workflows/build_binary.yml
index 59d6bee..439d098 100644
--- a/.github/workflows/build_binary.yml
+++ b/.github/workflows/build_binary.yml
@@ -30,6 +30,13 @@ jobs:
           version: '16'
           platform: 'x64'
 
+      - name: 'Setup Clang for FFI metadata'
+        uses: KyleMayes/install-llvm-action@v2
+        with:
+          version: '22.1.0'
+          force-url: 'https://github.com/llvm/llvm-project/releases/download/llvmorg-22.1.0/LLVM-22.1.0-Linux-X64.tar.xz'
+          env: false
+
       - name: 'Setup CMake'
         uses: jwlawson/actions-setup-cmake@v2
         with:
@@ -39,11 +46,13 @@ jobs:
         run: |
           cmake --preset linux-gcc-release \
             -DCMAKE_C_COMPILER=gcc-16 \
-            -DCMAKE_CXX_COMPILER=g++-16
+            -DCMAKE_CXX_COMPILER=g++-16 \
+            -DCPP_CORE_AST_CLANGXX="${LLVM_PATH}/bin/clang++"
 
       - name: 'Build'
         run: |
-          cmake --build --preset linux-gcc-release --target cpp_bindings_linux
+          cmake --build --preset linux-gcc-release \
+            --target cpp_bindings_linux cpp_core_ast_slim_json
       
       - name: 'Set PACKAGE_VERSION from env.bat'
         id: version
@@ -70,7 +79,9 @@ jobs:
         with:
           if-no-files-found: error
           name: libcpp_bindings_linux
-          path: build/libcpp_bindings_linux.so
+          path: |
+            build/libcpp_bindings_linux.so
+            build/ast/cpp_core_ffi_api.json
 
       - name: 'Create GitHub Release'
         if: github.ref_type == 'tag' && steps.check-tag.outputs.IS_VALID_PACKAGE_VERSION == 'true'
diff --git a/.github/workflows/publish_jsr.yml b/.github/workflows/publish_jsr.yml
index daef149..b47aaa6 100644
--- a/.github/workflows/publish_jsr.yml
+++ b/.github/workflows/publish_jsr.yml
@@ -49,7 +49,9 @@ jobs:
       - name: 'Prepare files for JSR'
         run: |
           mkdir -p ./jsr/bin
+          mkdir -p ./jsr/ffi
           cp ./artifacts/libcpp_bindings_linux.so ./jsr/bin/x86_64.so
+          cp ./artifacts/ast/cpp_core_ffi_api.json ./jsr/ffi/cpp_core_ffi_api.json
 
           ./jsr/scripts/binary_to_json.sh \
             ./artifacts/libcpp_bindings_linux.so \
@@ -71,4 +73,3 @@ jobs:
         working-directory: jsr
         run: |
           deno publish --allow-dirty --dry-run
-
diff --git a/jsr/.gitignore b/jsr/.gitignore
index 0e547b0..a6eb0e0 100644
--- a/jsr/.gitignore
+++ b/jsr/.gitignore
@@ -1,2 +1,3 @@
 bin/
+ffi/
 !src/bin/
diff --git a/jsr/README.md b/jsr/README.md
index ecd8b74..c29e06d 100644
--- a/jsr/README.md
+++ b/jsr/README.md
@@ -5,6 +5,11 @@
 
 Binaries are provided as a [package on JSR](https://jsr.io/@serial/cpp-bindings-linux). They are serialized as a base64 string inside the JSON file.
 
+The package also includes the generated cpp-core FFI API metadata at
+`ffi/cpp_core_ffi_api.json`. It describes the exported C symbols, parameter and
+return types, callbacks, default values, and API documentation used by downstream
+FFI adapter generators.
+
 This package is primarily intended as a dependency for [`@serial/serial`](https://jsr.io/@serial/serial). However, it can also be used independently.
 
 
diff --git a/jsr/jsr.json b/jsr/jsr.json
index e26d409..6c558c6 100644
--- a/jsr/jsr.json
+++ b/jsr/jsr.json
@@ -12,12 +12,12 @@
       "LICENSE",
       "jsr.json",
       "src/**",
-      "bin/**"
+      "bin/**",
+      "ffi/**"
     ],
     "exclude": [
-      "!bin/"
+      "!bin/",
+      "!ffi/"
     ]
   }
 }
-
-