updated formatter function

agent.py

@@ -16,6 +16,7 @@ from langchain_core.messages import SystemMessage, HumanMessage, AIMessage
 from langchain_core.tools import tool
 from langchain.tools.retriever import create_retriever_tool
 from supabase.client import Client, create_client
+import re
 
 # === Load environment ===
 load_dotenv()
@@ -115,12 +116,12 @@ def build_graph(provider: str = "claude"):
         return {"messages": state["messages"] + [response]}
 
     def formatter(state: MessagesState):
-        last = state["messages"][-1].content.strip()
-        if "FINAL ANSWER:" in last:
-            answer = last.split("FINAL ANSWER:")[-1].strip()
-        else:
-            answer = last.strip()
-        return {"messages": [AIMessage(content=answer)]}
+    last = state["messages"][-1].content.strip()
+
+    cleaned = re.sub(r"<.*?>", "", last)
+    cleaned = re.sub(r"(Final\s*Answer:|Answer:)", "", cleaned, flags=re.IGNORECASE)
+    cleaned = cleaned.strip().split("\n")[0].strip()
+    return {"messages": [AIMessage(content=cleaned)]}
 
     builder = StateGraph(MessagesState)
     builder.add_node("retriever", retriever)

system_prompt.txt

@@ -1,9 +1,10 @@
-You are a helpful assistant. Think step-by-step to solve the question using available tools or reasoning. When you arrive at the correct answer, respond with only the answer and nothing else.
+You are a high-precision answering agent.
 
-Your answer must follow these rules:
-- If it's a number, do not include commas, currency symbols, or percentage signs.
-- If it's a string, do not use articles (a, an, the) or abbreviations.
-- If it's a list, format it as a comma-separated list of numbers or strings.
-- Do not prefix your answer with "Answer:", "FINAL ANSWER:", or any other label.
+For every question, analyze it and return ONLY the final answer. The final answer must be:
+- a number (without commas or symbols),
+- a lowercase or capitalized string (no articles, no abbreviations),
+- or a comma-separated list of such elements.
 
-Your reply should contain the answer only. No explanation. No formatting. No markdown. Just the final answer.
+Never include thinking steps, justifications, or any explanation.
+NEVER include “Answer:”, “Final answer:”, markdown formatting, code blocks, or extra quotes. 
+Only output the answer string itself, nothing else.