Mcp Server

Okay, here's an example of how you might structure a simple MCP (Minecraft Protocol) server in Python, designed to interact with a client (like a Minecraft game client) and tailored for use with Claude (or any other LLM) for potential game logic or content generation. This is a simplified example and doesn't cover all the complexities of the Minecraft protocol. It focuses on the core concepts. **Important Considerations:** * **Minecraft Protocol Complexity:** The Minecraft protocol is complex and version-dependent. This example is highly simplified and likely won't work directly with a modern Minecraft client without significant modification. You'll need to research the specific protocol version you want to support. * **Libraries:** Using a library like `mcstatus` or `python-minecraft-nbt` can greatly simplify working with the Minecraft protocol. However, for this example, I'll try to keep it relatively library-free to illustrate the core concepts. * **Security:** This example is for demonstration purposes only and is not secure. Do not expose this to the internet without proper security measures. * **Claude Integration:** The Claude integration is represented by placeholder comments. You'll need to use a Claude API client (e.g., Anthropic's Python SDK) to actually interact with Claude. ```python import socket import struct import json import threading # Configuration HOST = '127.0.0.1' # Localhost PORT = 25565 # Default Minecraft port (can be changed) # --- Minecraft Protocol Helper Functions --- def read_varint(sock): """Reads a Minecraft VarInt from the socket.""" result = 0 shift = 0 while True: byte = sock.recv(1) if not byte: return None # Connection closed byte = byte[0] result |= (byte & 0x7F) << shift shift += 7 if not (byte & 0x80): break return result def write_varint(sock, value): """Writes a Minecraft VarInt to the socket.""" while True: byte = value & 0x7F value >>= 7 if value != 0: byte |= 0x80 sock.send(bytes([byte])) if value == 0: break def read_string(sock): """Reads a Minecraft string (prefixed with a VarInt length).""" length = read_varint(sock) if length is None: return None data = sock.recv(length) return data.decode('utf-8') def write_string(sock, string): """Writes a Minecraft string (prefixed with a VarInt length).""" encoded = string.encode('utf-8') write_varint(sock, len(encoded)) sock.send(encoded) def pack_data(data_type, data): """Packs data according to the Minecraft data type.""" if data_type == "varint": return write_varint(data) elif data_type == "string": return write_string(data) elif data_type == "byte": return struct.pack("!b", data) elif data_type == "ubyte": return struct.pack("!B", data) elif data_type == "short": return struct.pack("!h", data) elif data_type == "ushort": return struct.pack("!H", data) elif data_type == "int": return struct.pack("!i", data) elif data_type == "long": return struct.pack("!q", data) elif data_type == "float": return struct.pack("!f", data) elif data_type == "double": return struct.pack("!d", data) elif data_type == "bool": return struct.pack("!?", data) else: raise ValueError(f"Unknown data type: {data_type}") def create_packet(packet_id, data): """Creates a Minecraft packet.""" packet_data = b"" for data_type, value in data: if data_type == "varint": packet_data += value elif data_type == "string": packet_data += value else: packet_data += pack_data(data_type, value) packet = b"" write_varint(packet, packet_id) packet += packet_data length = len(packet) packet_length = b"" write_varint(packet_length, length) return packet_length + packet # --- Packet Handling Functions --- def handle_handshake(sock): """Handles the initial handshake packet.""" protocol_version = read_varint(sock) server_address = read_string(sock) server_port = struct.unpack("!H", sock.recv(2))[0] # Unpack unsigned short (2 bytes) next_state = read_varint(sock) print(f"Handshake: Protocol {protocol_version}, Address {server_address}:{server_port}, Next State {next_state}") return next_state def handle_status_request(sock): """Handles the status request (ping).""" print("Status Request received") # Example status response (replace with dynamic data if needed) status = { "version": { "name": "My Claude Server", "protocol": 757 # Example protocol version }, "players": { "max": 10, "online": 0, "sample": [] }, "description": { "text": "A Minecraft server powered by Claude!" } } status_json = json.dumps(status) write_string(sock, status_json) # Send the packet packet_id = 0x00 # Status Response packet ID packet_data = [("string", status_json)] packet = create_packet(packet_id, packet_data) write_varint(sock, len(packet)) sock.sendall(packet) def handle_ping(sock): """Handles the ping request.""" payload = sock.recv(8) # 8-byte payload print(f"Ping received with payload: {payload}") # Send back the same payload packet_id = 0x01 # Pong packet ID packet_data = [("long", struct.unpack("!q", payload)[0])] packet = create_packet(packet_id, packet_data) write_varint(sock, len(packet)) sock.sendall(packet) def handle_login_start(sock): """Handles the login start packet (username).""" username = read_string(sock) print(f"Login Start: Username {username}") # --- Claude Integration Point --- # Here, you would send the username (and potentially other data) to Claude. # Claude could then generate a response, such as a welcome message, # a custom world seed, or even modify the player's starting inventory. # # Example (replace with actual Claude API call): # claude_response = claude.generate_response(f"Minecraft player joined: {username}") # print(f"Claude response: {claude_response}") # For now, just send a simple login success packet. uuid = "00000000-0000-0000-0000-000000000000" # Dummy UUID packet_id = 0x02 # Login Success packet ID packet_data = [("string", uuid), ("string", username)] packet = create_packet(packet_id, packet_data) write_varint(sock, len(packet)) sock.sendall(packet) # Example: Send a chat message to the player (after login) chat_message = {"text": f"Welcome to the server, {username}!"} chat_json = json.dumps(chat_message) packet_id = 0x0F # Chat Message packet ID (example) packet_data = [("string", chat_json), ("byte", 0), ("string", "00000000-0000-0000-0000-000000000000")] packet = create_packet(packet_id, packet_data) write_varint(sock, len(packet)) sock.sendall(packet) def handle_client(sock, addr): """Handles a single client connection.""" print(f"Accepted connection from {addr}") try: state = handle_handshake(sock) if state == 1: # Status handle_status_request(sock) handle_ping(sock) elif state == 2: # Login handle_login_start(sock) # After login, you would enter the "play" state and handle game packets. # This is where you'd receive player actions (movement, chat, etc.) # and send world updates. This is a very complex part of the protocol. while True: # Example: Receive a packet and print its ID (for debugging) packet_length = read_varint(sock) if packet_length is None: break # Connection closed packet_id = read_varint(sock) print(f"Received packet with ID: 0x{packet_id:02X}") # --- Claude Integration Point --- # You could send the packet data to Claude for analysis or processing. # For example, Claude could analyze chat messages, detect suspicious # player behavior, or generate new game events. # # Example: # claude_analysis = claude.analyze_packet(packet_id, packet_data) # print(f"Claude analysis: {claude_analysis}") else: print(f"Unknown state: {state}") except Exception as e: print(f"Error handling client: {e}") finally: print(f"Closing connection from {addr}") sock.close() # --- Main Server Loop --- def main(): """Main server function.""" server_socket = socket.socket(socket.AF_INET, socket.SOCK_STREAM) server_socket.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEADDR, 1) # Allow address reuse server_socket.bind((HOST, PORT)) server_socket.listen(5) # Listen for up to 5 connections print(f"Listening on {HOST}:{PORT}") try: while True: sock, addr = server_socket.accept() client_thread = threading.Thread(target=handle_client, args=(sock, addr)) client_thread.start() except KeyboardInterrupt: print("Shutting down server...") finally: server_socket.close() if __name__ == "__main__": main() ``` **Explanation and Key Points:** 1. **Socket Setup:** The code creates a basic TCP socket server. 2. **Minecraft Protocol Functions:** * `read_varint`, `write_varint`: Minecraft uses VarInts (variable-length integers) for packet lengths and IDs. These functions handle reading and writing them. * `read_string`, `write_string`: Handle reading and writing strings, which are prefixed with a VarInt length. * `pack_data`: Packs data into bytes according to the specified Minecraft data type. * `create_packet`: Creates a Minecraft packet by combining the packet ID and data. 3. **Packet Handling:** * `handle_handshake`: Handles the initial handshake packet, which determines the client's intended state (status or login). * `handle_status_request`, `handle_ping`: Handle the status request (used to get server information) and the ping (used to measure latency). * `handle_login_start`: Handles the login start packet, which contains the player's username. **This is a key integration point for Claude.** 4. **Claude Integration (Placeholders):** * The `handle_login_start` function contains comments indicating where you would integrate with the Claude API. You would: * Send the player's username (and potentially other data) to Claude. * Receive a response from Claude. * Use Claude's response to customize the player's experience (e.g., generate a welcome message, modify the world, etc.). * The `handle_client` function also has a placeholder for Claude integration during the "play" state, where you could analyze player actions and generate dynamic game events. 5. **Threading:** Each client connection is handled in a separate thread, allowing the server to handle multiple clients concurrently. 6. **Error Handling:** Includes basic `try...except` blocks to catch potential errors. 7. **Simplified Protocol:** This example only implements a very small subset of the Minecraft protocol. It's enough to get a basic connection and login working, but it doesn't handle the full game logic. **To use this code:** 1. **Install Python:** Make sure you have Python 3 installed. 2. **Install Anthropic's Python SDK (if using Claude):** ```bash pip install anthropic ``` 3. **Replace Placeholders:** Replace the Claude integration placeholders with your actual Claude API calls. You'll need to set up an Anthropic API key. 4. **Run the Server:** Run the Python script. 5. **Connect with a Minecraft Client:** You'll need to use a Minecraft client that supports the protocol version you're targeting. You might need to modify the client or use a proxy to connect to this simplified server. **This is the tricky part, as the protocol is complex.** **Chinese Translation of Key Concepts:** * **Minecraft Protocol:** Minecraft 协议 (Minecraft Xiéyì) * **Server:** 服务器 (Fúwùqì) * **Client:** 客户端 (Kèhùduān) * **Packet:** 数据包 (Shùjùbāo) * **Handshake:** 握手 (Wòshǒu) * **Status:** 状态 (Zhuàngtài) * **Login:** 登录 (Dēnglù) * **VarInt:** 变长整数 (Biàn cháng zhěngshù) * **Socket:** 套接字 (Tàojiēzì) * **Thread:** 线程 (Xiànchéng) * **Claude Integration:** Claude 集成 (Claude Jíchéng) * **Protocol Version:** 协议版本 (Xiéyì Bǎnběn) * **Username:** 用户名 (Yònghùmíng) * **UUID:** 通用唯一识别码 (Tōngyòng Wéiyī Shìbiémǎ) **Example Chinese Comments for the Code:** ```python # --- Minecraft 协议助手函数 --- (Minecraft Protocol Helper Functions) def read_varint(sock): """从套接字读取 Minecraft 变长整数。""" # Reads a Minecraft VarInt from the socket. # ... def handle_login_start(sock): """处理登录开始数据包（用户名）。""" # Handles the login start packet (username). username = read_string(sock) print(f"登录开始: 用户名 {username}") # Login Start: Username {username} # --- Claude 集成点 --- (Claude Integration Point) # 在这里，你可以将用户名（以及其他数据）发送给 Claude。 # Claude 可以生成一个响应，例如欢迎消息、自定义世界种子， # 甚至修改玩家的起始物品栏。 # ... ``` This provides a starting point. Building a fully functional Minecraft server is a significant undertaking, but this example gives you a basic framework and highlights the areas where you can integrate Claude to add AI-powered features to your Minecraft world. Remember to consult the Minecraft protocol documentation for the specific version you are targeting. Good luck!