Fix VM command execution to capture output

README.md

@@ -5,7 +5,7 @@
 ## Features
 
 - **Persistent chat history** – conversations are stored in `chat.db` per user and session so they can be resumed later.
-- **Tool execution** – a built-in `execute_terminal` tool runs commands inside a Docker-based VM. Network access is enabled and both stdout and stderr are captured (up to 10,000 characters). The VM is reused across chats when `PERSIST_VMS=1` so installed packages remain available.
+- **Tool execution** – a built-in `execute_terminal` tool runs commands inside a Docker-based VM using `docker exec -i`. Network access is enabled and both stdout and stderr are captured (up to 10,000 characters). The VM is reused across chats when `PERSIST_VMS=1` so installed packages remain available.
 - **System prompts** – every request includes a system prompt that guides the assistant to plan tool usage, verify results and avoid unnecessary jargon.
 
 ## Environment Variables

src/vm.py

@@ -120,6 +120,7 @@ class LinuxVM:
         cmd = [
             "docker",
             "exec",
+            "-i",
         ]
         if detach:
             cmd.append("-d")