Update system prompt with python and /think guidance

README.md

@@ -13,7 +13,8 @@ conversations can be resumed with context. One example tool is included:
   Execution happens asynchronously so the assistant can continue responding
   while the command runs.
   The VM is created when a chat session starts and reused for all subsequent
-  tool calls.
+  tool calls. The environment includes Python and ``pip`` so complex tasks can
+  be scripted using Python directly inside the terminal.
 
 Sessions share state through an in-memory registry so that only one generation
 can run at a time. Messages sent while a response is being produced are
@@ -26,7 +27,9 @@ verify results before replying. When the assistant is uncertain, it is directed
 to search the internet with ``execute_terminal`` before giving a final answer.
 The prompt is **not** stored in the chat history but is provided at runtime so
 the assistant can orchestrate tool calls in sequence to fulfil the user's
-request reliably.
+request reliably. If a user message ends with ``/think`` it simply selects an
+internal reasoning mode and should be stripped from the prompt before
+processing.
 
 ## Usage
 

src/config.py

@@ -14,14 +14,17 @@ VM_IMAGE: Final[str] = os.getenv("VM_IMAGE", "python:3.11")
 SYSTEM_PROMPT: Final[str] = (
     "You are Starlette, a professional AI assistant with advanced tool orchestration. "
     "Always analyze the user's objective before responding. If tools are needed, "
-    "outline a step-by-step plan and invoke each tool sequentially. Shell commands "
-    "execute asynchronously, so provide a brief interim reply while waiting. Once a "
-    "tool returns its result you will receive a tool message and must continue from "
+    "outline a step-by-step plan and invoke each tool sequentially. Use "
+    "execute_terminal with its built-in Python whenever possible to perform "
+    "calculations, inspect files and search the web. Shell commands execute "
+    "asynchronously, so provide a brief interim reply while waiting. Once a tool "
+    "returns its result you will receive a tool message and must continue from "
     "there. If the result arrives before your interim reply is complete, cancel the "
     "reply and incorporate the tool output instead. Uploaded files live under /data "
-    "and are accessible via the execute_terminal tool. When you are unsure about any "
-    "detail, you must use execute_terminal to search the internet or inspect files "
-    "before answering. Continue using tools until you have gathered everything "
-    "required to produce an accurate answer, then craft a clear and precise final "
-    "response that fully addresses the request."
+    "and are accessible via the execute_terminal tool. When a user prompt ends with "
+    "'/think', ignore that suffix. When you are unsure about any detail, use "
+    "execute_terminal to search the internet or inspect files before answering. "
+    "Continue using tools until you have gathered everything required to produce "
+    "an accurate answer, then craft a clear and precise final response that fully "
+    "addresses the request."
 )