Initial commit

Dockerfile

@@ -0,0 +1,8 @@
+# Dockerfile
+FROM python:3.11-slim
+COPY --from=ghcr.io/astral-sh/uv:latest /uv /uvx /bin/
+WORKDIR /app
+RUN uv pip install --system fastmcp mcp
+COPY server.py .
+EXPOSE 8000
+CMD ["python", "server.py"]

server.py

@@ -0,0 +1,34 @@
+# server.py
+import sys
+import io
+import contextlib
+from mcp.server.fastmcp import FastMCP
+
+mcp = FastMCP("Sandbox-Python")
+
+@mcp.tool()
+def execute_python_code(code: str) -> str:
+    """
+    Executes arbitrary Python 3 code in this isolated sandbox container.
+    Returns the standard output (stdout) and error streams (stderr).
+    """
+    stdout_buffer = io.StringIO()
+    stderr_buffer = io.StringIO()
+    
+    with contextlib.redirect_stdout(stdout_buffer), contextlib.redirect_stderr(stderr_buffer):
+        try:
+            # Execute within isolated global/local frames
+            exec(code, {}, {})
+        except Exception as e:
+            sys.stderr.write(f"Runtime Error: {str(e)}")
+            
+    output = stdout_buffer.getvalue()
+    errors = stderr_buffer.getvalue()
+    
+    if errors:
+        return f"Errors caught during execution:\n{errors}\nPartial Output:\n{output}"
+    return output if output else "Code executed successfully with no returned stdout."
+
+if __name__ == "__main__":
+    # Override standard stdio pipes to expose an HTTP/SSE server
+    mcp.run(transport="sse", host="0.0.0.0", port=8000)