diff --git a/servicex_codegen/post_operation.py b/servicex_codegen/post_operation.py
index e30f7a6..0d300dd 100644
--- a/servicex_codegen/post_operation.py
+++ b/servicex_codegen/post_operation.py
@@ -26,7 +26,7 @@
 #   OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 #   OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 #
-
+import json
 #
 # Redistribution and use in source and binary forms, with or without
 # modification, are permitted provided that the following conditions are met:
@@ -85,6 +85,10 @@ def stream_generated_code(self, generated_code_result: GeneratedFileResult) -> b
 
     def post(self):
         try:
+            with open("transformer_capabilities.json") as capabilities_file:
+                capabilities = json.load(capabilities_file)
+                print("capable", capabilities['language'], capabilities['command'])
+
             with TemporaryDirectory() as tempdir:
                 body = request.get_json()
                 generated_code_result = self.code_generator.generate_code(
@@ -99,6 +103,8 @@ def post(self):
                 # them into a multipart mime data type
                 m = MultipartEncoder(
                     fields={'transformer_image': transformer_image,
+                            'language': capabilities['language'],
+                            'command': capabilities['command'],
                             'zip_data': zip_data}
                 )
 
diff --git a/tests/test_post_operation.py b/tests/test_post_operation.py
index 3da88bf..7db7b75 100644
--- a/tests/test_post_operation.py
+++ b/tests/test_post_operation.py
@@ -86,7 +86,7 @@ def test_post_good_query_with_params(self, mocker):
         decoder_parts = decoder.MultipartDecoder(response.data, content_type)
 
         transformer_image = str(decoder_parts.parts[0].content, 'utf-8')
-        zip_file = decoder_parts.parts[1].content
+        zip_file = decoder_parts.parts[3].content
 
         print("Transformer Image: ", transformer_image)
         print("Zip File: ", zip_file)
@@ -131,7 +131,7 @@ def test_post_good_query_without_params(self, mocker):
             decoder_parts = decoder.MultipartDecoder(response.data, content_type)
 
             transformer_image = str(decoder_parts.parts[0].content, 'utf-8')
-            zip_file = decoder_parts.parts[1].content
+            zip_file = decoder_parts.parts[3].content
 
             print("Transformer Image: ", transformer_image)
             print("Zip File: ", zip_file)
diff --git a/transformer_capabilities.json b/transformer_capabilities.json
new file mode 100644
index 0000000..10ff7c4
--- /dev/null
+++ b/transformer_capabilities.json
@@ -0,0 +1,9 @@
+{
+  "name": "FuncADL based uproot transformer",
+  "description": "Extracts data from flat ntuple style root files.",
+  "limitations": "Would be good to note what isn't implemented",
+  "file-formats": ["parquet"],
+  "stats-parser": "UprootStats",
+  "language": "python",
+  "command": "/generated/transform_single_file.py"
+}
\ No newline at end of file