Cache initial prompt (#65)

* cache initial prompt

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

* update graphcore to cacheInitialPrompt

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

* update graphcore with mypy fix

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

---------

Co-authored-by: Claude Opus 4.6 <noreply@anthropic.com>

Author: shellygr

analyzer/analysis.py

@@ -286,14 +286,21 @@ def _analyze_core(
 
     system_prompt = load_jinja_template("analyzer_system_prompt.j2")
 
+    # Wrap initial_prompt with cache_control for prompt caching
+    initial_prompt_with_cache = {
+        "type": "text",
+        "text": initial_prompt,
+        "cache_control": {"type": "ephemeral"}
+    }
+
     graph = build_workflow(
         input_type=FlowInput,
         context_schema=ExplainerContext,
         output_key="result",
         tools_list=tools,
         unbound_llm=llm,
         sys_prompt=system_prompt,
-        initial_prompt=initial_prompt,
+        initial_prompt=initial_prompt_with_cache,
         state_class=SimpleState
     )[0].compile(checkpointer=InMemorySaver())