Cloud ingestion strategy with prepdocs as custom skillset for Azure AI Search Blob Indexer

.gitignore

@@ -148,6 +148,8 @@ npm-debug.log*
 node_modules
 static/
 
+app/functions/*/prepdocslib/
+
 data/**/*.md5
 
 .DS_Store

AGENTS.md

@@ -17,7 +17,11 @@ If necessary, edit this file to ensure it accurately reflects the current state
       * app/backend/approaches/prompts/chat_query_rewrite.prompty: Prompt used to rewrite the query based off search history into a better search query
       * app/backend/approaches/prompts/chat_query_rewrite_tools.json: Tools used by the query rewriting prompt
       * app/backend/approaches/prompts/chat_answer_question.prompty: Prompt used by the Chat approach to actually answer the question based off sources
+    * app/backend/prepdocslib/cloudingestionstrategy.py: Builds the Azure AI Search indexer and skillset for the cloud ingestion pipeline
+    * app/backend/prepdocslib/pdfparser.py: Uses Azure Document Intelligence to emit page text plus figure placeholders
+    * app/backend/prepdocslib/figureprocessor.py: Shared helper that generates figure descriptions for both local ingestion and the cloud figure-processor skill
     * app/backend/app.py: The main entry point for the backend application.
+  * app/functions: Azure Functions used for cloud ingestion custom skills (document extraction, figure processing, text processing). Each function bundles a synchronized copy of `prepdocslib`; run `python scripts/copy_prepdocslib.py` to refresh the local copies if you modify the library.
   * app/frontend: Contains the React frontend code, built with TypeScript, built with vite.
     * app/frontend/src/api: Contains the API client code for communicating with the backend.
     * app/frontend/src/components: Contains the React components for the frontend.
@@ -65,7 +69,7 @@ When adding a new developer setting, update:
   * app/backend/approaches/retrievethenread.py : Retrieve from overrides parameter
   * app/backend/app.py: Some settings may need to be sent down in the /config route.
 
-## When adding tests for a new feature:
+## When adding tests for a new feature
 
 All tests are in the `tests` folder and use the pytest framework.
 There are three styles of tests:

app/backend/app.py

@@ -586,7 +586,7 @@ async def setup_clients():
         current_app.config[CONFIG_USER_BLOB_MANAGER] = user_blob_manager
 
         # Set up ingester
-        file_processors = setup_file_processors(
+        file_processors, figure_processor = setup_file_processors(
             azure_credential=azure_credential,
             document_intelligence_service=os.getenv("AZURE_DOCUMENTINTELLIGENCE_SERVICE"),
             local_pdf_parser=os.getenv("USE_LOCAL_PDF_PARSER", "").lower() == "true",
@@ -627,6 +627,7 @@ async def setup_clients():
             image_embeddings=image_embeddings_service,
             search_field_name_embedding=AZURE_SEARCH_FIELD_NAME_EMBEDDING,
             blob_manager=user_blob_manager,
+            figure_processor=figure_processor,
         )
         current_app.config[CONFIG_INGESTER] = ingester