diff --git a/src/main/askai/core/router.py b/src/main/askai/core/router.py
index e5e609cf..3562a3ab 100644
--- a/src/main/askai/core/router.py
+++ b/src/main/askai/core/router.py
@@ -1,74 +1,91 @@
 import json
 from operator import itemgetter
+from typing import Optional, TypeAlias
 
+from hspylib.core.metaclass.singleton import Singleton
 from langchain.output_parsers import JsonOutputToolsParser
 from langchain_core.runnables import Runnable, RunnableLambda, RunnablePassthrough
+from langchain_core.runnables.utils import Input, Output
 from langchain_core.tools import tool
 from langchain_openai import ChatOpenAI
 
 
-@tool
-def count_emails(last_n_days: int) -> int:
-    """Multiply two integers together."""
-    return last_n_days * 2
-
-
-@tool
-def send_email(message: str, recipient: str) -> str:
-    """Send an email to the recipient."""
-    return f"Successfully sent email '{message}' to {recipient}."
-
-
-@tool
-def list_files(path: str) -> str:
-    """List the contents of a directory."""
-    return f"""
-    You list of files in: '{path}'.
-       Audio Music Apps/       Music/        Highway-to-Hell.m4a        Opus46.mp3               barbershop.mp3
-       Logic Projects/         iTunes/       Last-Kiss.m4a              Thunderstruck.m4a        iTunesMusic
-    """
-
-
-@tool
-def analyze_content(text: str) -> str:
-    """Analyze the content."""
-    return f"""
-    Analysing your text: '{text}':
-
-    You have four folders and five music files.
-    """
-
-
-tools = [count_emails, send_email, list_files, analyze_content]
-model = ChatOpenAI(model="gpt-3.5-turbo", temperature=0).bind_tools(tools)
-
-
-def call_tool(tool_invocation: dict) -> Runnable:
-    """Function for dynamically constructing the end of the chain based on the model-selected tool."""
-    tool_map = {tool.name: tool for tool in tools}
-    tool = tool_map[tool_invocation["type"]]
-    return RunnablePassthrough.assign(output=itemgetter("args") | tool)
-
-
-def human_approval(tool_invocations: list) -> list:
-    tool_strs = "\n\n".join(
-        json.dumps(tool_call, indent=2) for tool_call in tool_invocations
-    )
-    msg = (
-        f"Do you approve of the following tool invocations\n\n{tool_strs}\n\n"
-        "Anything except 'Y'/'Yes' (case-insensitive) will be treated as a no."
-    )
-    resp = input(msg)
-    if resp.lower() not in ("yes", "y"):
-        raise ValueError(f"Tool invocations not approved:\n\n{tool_strs}")
-    return tool_invocations
-
-
-# .map() allows us to apply a function to a list of inputs.
-call_tool_list = RunnableLambda(call_tool).map()
-chain = model | JsonOutputToolsParser() | call_tool_list
-content = chain.invoke("list my downloads")
-
-call_tool_list = RunnableLambda(call_tool).map()
-chain = model | JsonOutputToolsParser() | call_tool_list
-print(chain.invoke(f"analyze the content: '{content}'"))
+RunnableTool: TypeAlias = Runnable[list[Input], list[Output]]
+
+
+class Router(metaclass=Singleton):
+    """TODO"""
+
+    INSTANCE: 'Router' = None
+
+    @staticmethod
+    @tool
+    def count_emails(last_n_days: int) -> int:
+        """Multiply two integers together."""
+        return last_n_days * 2
+
+    @staticmethod
+    @tool
+    def send_email(message: str, recipient: str) -> str:
+        """Send an email to the recipient."""
+        return f"Successfully sent email '{message}' to {recipient}."
+
+    @staticmethod
+    @tool
+    def list_files(path: str) -> str:
+        """List the contents of a directory."""
+        return f"""
+        You list of files in: '{path}'.
+            Audio Music Apps/        Music/         Highway-to-Hell.m4a         Opus46.mp3                barbershop.mp3
+            Logic Projects/          iTunes/        Last-Kiss.m4a               Thunderstruck.m4a         iTunesMusic
+        """
+
+    @staticmethod
+    @tool
+    def analyze_output(text: str) -> str:
+        """Analyze llm outputs."""
+        return f"""
+        Analysing your text: '{text}':
+
+        You have four folders and five music files.
+        """
+
+    def __init__(self):
+        self.tools = [
+            Router.count_emails, Router.send_email, Router.list_files, Router.analyze_output
+        ]
+        self.model = ChatOpenAI(model="gpt-3.5-turbo", temperature=0).bind_tools(self.tools)
+
+    def call_tool(self, tool_invocation: dict) -> Runnable:
+        """Function for dynamically constructing the end of the chain based on the model-selected tool."""
+        tool_map = {tool.name: tool for tool in self.tools}
+        tool = tool_map[tool_invocation["type"]]
+        return RunnablePassthrough.assign(output=itemgetter("args") | tool)
+
+    def human_approval(self, tool_invocations: list) -> list:
+        tool_strs = "\n\n".join(
+            json.dumps(tool_call, indent=2) for tool_call in tool_invocations
+        )
+        msg = (
+            f"Do you approve of the following tool invocations\n\n{tool_strs}\n\n"
+            "Anything except 'Y'/'Yes' (case-insensitive) will be treated as a no."
+        )
+        resp = input(msg)
+        if resp.lower() not in ("yes", "y"):
+            raise ValueError(f"Tool invocations not approved:\n\n{tool_strs}")
+        return tool_invocations
+
+    def ask(self, *questions: str) -> Optional[str]:
+        result: list[RunnableTool] | None = None
+        for q in questions:
+            # .map() allows us to apply a function to a list of inputs.
+            call_tool_list = RunnableLambda(self.call_tool).map()
+            chain = self.model | JsonOutputToolsParser() | call_tool_list
+            result: list[RunnableTool] = chain.invoke(f"{q} {result}")
+        return ' '.join([r['output'] for r in result]) if result else None
+
+
+assert (router := Router().INSTANCE) is not None
+
+if __name__ == '__main__':
+    print(router.ask('list my downloads', 'analyze the output'))