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"""
Command-line interface for the A2A package.
"""
import argparse
import json
import sys
import os
import asyncio
from typing import Dict, Any, Optional, List, Tuple
from .models import Message, TextContent, MessageRole, Conversation
from .client import A2AClient, AgentNetwork, StreamingClient
from .server import A2AServer, run_server
from .utils import (
pretty_print_message,
pretty_print_conversation,
create_text_message
)
from .exceptions import A2AError, A2AImportError
def send_command(args: argparse.Namespace) -> int:
"""
Send a message to an A2A agent
Args:
args: Command-line arguments
Returns:
Exit code (0 for success, non-zero for failure)
"""
try:
client = A2AClient(args.endpoint)
# Check if input is a file path or direct text
if args.message.endswith('.json') and os.path.isfile(args.message):
# Load message from JSON file
with open(args.message) as f:
message_data = json.load(f)
try:
if "messages" in message_data:
# This is a conversation
conversation = Conversation.from_dict(message_data)
print(f"Sending conversation with {len(conversation.messages)} messages...")
response = client.send_conversation(conversation)
pretty_print_conversation(response)
else:
# This is a single message
message = Message.from_dict(message_data)
print("Sending message...")
response = client.send_message(message)
pretty_print_message(response)
except Exception as e:
print(f"Error parsing JSON: {str(e)}")
return 1
else:
# Create a simple text message
message = create_text_message(args.message)
print("Sending message...")
response = client.send_message(message)
pretty_print_message(response)
return 0
except A2AError as e:
print(f"Error: {str(e)}")
return 1
except Exception as e:
print(f"Unexpected error: {str(e)}")
return 1
def serve_command(args: argparse.Namespace) -> int:
"""
Start an A2A server
Args:
args: Command-line arguments
Returns:
Exit code (0 for success, non-zero for failure)
"""
try:
# Try to import Flask
try:
from flask import Flask
except ImportError:
raise A2AImportError(
"Flask is not installed. "
"Install it with 'pip install flask'"
)
# Create a simple A2A server
agent = A2AServer()
# Start the server
run_server(
agent=agent,
host=args.host,
port=args.port,
debug=args.debug
)
return 0
except A2AError as e:
print(f"Error: {str(e)}")
return 1
except Exception as e:
print(f"Unexpected error: {str(e)}")
return 1
def openai_command(args: argparse.Namespace) -> int:
"""
Start an OpenAI-powered A2A server
Args:
args: Command-line arguments
Returns:
Exit code (0 for success, non-zero for failure)
"""
try:
# Check for OpenAI API key
api_key = args.api_key or os.environ.get("OPENAI_API_KEY")
if not api_key:
print("Error: OpenAI API key is required. Provide it with --api-key or set the OPENAI_API_KEY environment variable.")
return 1
# Import OpenAI server
try:
from .server.llm import OpenAIA2AServer
except ImportError as e:
raise A2AImportError(
f"Could not import OpenAIA2AServer: {str(e)}. "
"Make sure openai is installed with 'pip install openai'"
)
# Create OpenAI server
agent = OpenAIA2AServer(
api_key=api_key,
model=args.model,
temperature=args.temperature,
system_prompt=args.system_prompt
)
print(f"Starting OpenAI-powered A2A server with model {args.model}")
print(f"System prompt: {args.system_prompt}")
# Start the server
run_server(
agent=agent,
host=args.host,
port=args.port,
debug=args.debug
)
return 0
except A2AError as e:
print(f"Error: {str(e)}")
return 1
except Exception as e:
print(f"Unexpected error: {str(e)}")
return 1
def anthropic_command(args: argparse.Namespace) -> int:
"""
Start an Anthropic-powered A2A server
Args:
args: Command-line arguments
Returns:
Exit code (0 for success, non-zero for failure)
"""
try:
# Check for Anthropic API key
api_key = args.api_key or os.environ.get("ANTHROPIC_API_KEY")
if not api_key:
print("Error: Anthropic API key is required. Provide it with --api-key or set the ANTHROPIC_API_KEY environment variable.")
return 1
# Import Anthropic server
try:
from .server.llm import AnthropicA2AServer
except ImportError as e:
raise A2AImportError(
f"Could not import AnthropicA2AServer: {str(e)}. "
"Make sure anthropic is installed with 'pip install anthropic'"
)
# Create Anthropic server
agent = AnthropicA2AServer(
api_key=api_key,
model=args.model,
temperature=args.temperature,
max_tokens=args.max_tokens,
system_prompt=args.system_prompt
)
print(f"Starting Anthropic-powered A2A server with model {args.model}")
print(f"System prompt: {args.system_prompt}")
# Start the server
run_server(
agent=agent,
host=args.host,
port=args.port,
debug=args.debug
)
return 0
except A2AError as e:
print(f"Error: {str(e)}")
return 1
except Exception as e:
print(f"Unexpected error: {str(e)}")
return 1
def mcp_command(args: argparse.Namespace) -> int:
"""
Start an MCP server
Args:
args: Command-line arguments
Returns:
Exit code (0 for success, non-zero for failure)
"""
try:
# Import FastMCP and related modules
try:
from .mcp import FastMCP, create_fastapi_app
import uvicorn
except ImportError as e:
raise A2AImportError(
f"Could not import MCP modules: {str(e)}. "
"Make sure required packages are installed with 'pip install fastapi uvicorn'"
)
# Create a FastMCP server
mcp_server = FastMCP(
name=args.name,
version=args.version,
description=args.description
)
if args.script:
# Load tools from a Python script
try:
import importlib.util
spec = importlib.util.spec_from_file_location("mcp_tools", args.script)
module = importlib.util.module_from_spec(spec)
spec.loader.exec_module(module)
# Look for a setup_mcp function in the module
if hasattr(module, 'setup_mcp'):
module.setup_mcp(mcp_server)
print(f"Loaded MCP tools from {args.script}")
else:
print(f"Warning: No setup_mcp function found in {args.script}")
except Exception as e:
print(f"Error loading script {args.script}: {e}")
return 1
# Create FastAPI app
app = create_fastapi_app(mcp_server)
print(f"Starting MCP server '{args.name}' v{args.version} on http://{args.host}:{args.port}")
print(f"Description: {args.description}")
# Run the server using uvicorn
uvicorn.run(app, host=args.host, port=args.port)
return 0
except A2AError as e:
print(f"Error: {str(e)}")
return 1
except Exception as e:
print(f"Unexpected error: {str(e)}")
return 1
def mcp_agent_command(args: argparse.Namespace) -> int:
"""
Start an MCP-enabled A2A agent
Args:
args: Command-line arguments
Returns:
Exit code (0 for success, non-zero for failure)
"""
try:
# Import MCP agent classes
try:
from .mcp import A2AMCPAgent, FastMCP
import importlib.util
except ImportError as e:
raise A2AImportError(
f"Could not import MCP modules: {str(e)}. "
"Make sure required packages are installed"
)
# Load MCP servers from config file if provided
mcp_servers = {}
if args.config:
try:
with open(args.config, 'r') as f:
config = json.load(f)
# Process server configurations
for server_name, server_config in config.get("servers", {}).items():
if isinstance(server_config, str):
# Simple URL string
mcp_servers[server_name] = server_config
elif isinstance(server_config, dict) and "url" in server_config:
# Dictionary with URL and other options
mcp_servers[server_name] = server_config
except Exception as e:
print(f"Error loading config file {args.config}: {e}")
return 1
# Add any individually specified servers
if args.servers:
for server_spec in args.servers:
try:
name, url = server_spec.split("=", 1)
mcp_servers[name] = url
except ValueError:
print(f"Error: Invalid server specification '{server_spec}'. Use format 'name=url'")
return 1
# Load script if provided
if args.script:
try:
spec = importlib.util.spec_from_file_location("mcp_agent", args.script)
module = importlib.util.module_from_spec(spec)
spec.loader.exec_module(module)
# Create agent using function from module
if hasattr(module, 'create_agent'):
agent = module.create_agent(mcp_servers=mcp_servers)
else:
raise ValueError(f"No create_agent function found in {args.script}")
except Exception as e:
print(f"Error loading script {args.script}: {e}")
return 1
else:
# Create a default A2A MCP agent
agent = A2AMCPAgent(
name=args.name,
description=args.description,
mcp_servers=mcp_servers
)
print(f"Starting MCP-enabled A2A agent '{args.name}' on http://{args.host}:{args.port}/a2a")
if mcp_servers:
print(f"Connected to MCP servers:")
for name, config in mcp_servers.items():
if isinstance(config, str):
print(f" - {name}: {config}")
elif isinstance(config, dict) and "url" in config:
print(f" - {name}: {config['url']}")
# Start the server
run_server(
agent=agent,
host=args.host,
port=args.port,
debug=args.debug
)
return 0
except A2AError as e:
print(f"Error: {str(e)}")
return 1
except Exception as e:
print(f"Unexpected error: {str(e)}")
return 1
def mcp_call_command(args: argparse.Namespace) -> int:
"""
Call an MCP tool directly
Args:
args: Command-line arguments
Returns:
Exit code (0 for success, non-zero for failure)
"""
try:
# Import MCP client
try:
from .mcp import MCPClient
import asyncio
except ImportError as e:
raise A2AImportError(
f"Could not import MCP modules: {str(e)}. "
"Make sure required packages are installed"
)
# Create client
client = MCPClient(args.endpoint)
# Parse parameters
params = {}
if args.params:
for param in args.params:
try:
name, value = param.split("=", 1)
# Try to convert to appropriate type (int, float, bool)
if value.lower() == "true":
value = True
elif value.lower() == "false":
value = False
elif value.isdigit():
value = int(value)
else:
try:
value = float(value)
except ValueError:
# Keep as string
pass
params[name] = value
except ValueError:
print(f"Error: Invalid parameter '{param}'. Use format 'name=value'")
return 1
# Define async function to call the tool
async def call_tool():
try:
# Initialize MCP client if needed
if hasattr(client, 'initialize_mcp_servers'):
await client.initialize_mcp_servers()
# Call the tool
result = await client.call_tool(args.tool, **params)
# Print result
if isinstance(result, dict):
print(json.dumps(result, indent=2))
elif isinstance(result, str):
print(result)
else:
print(f"Result: {result}")
return True
except Exception as e:
print(f"Error calling tool: {e}")
return False
# Run the async function
loop = asyncio.get_event_loop()
success = loop.run_until_complete(call_tool())
return 0 if success else 1
except A2AError as e:
print(f"Error: {str(e)}")
return 1
except Exception as e:
print(f"Unexpected error: {str(e)}")
return 1
def stream_command(args: argparse.Namespace) -> int:
"""
Stream a response from an A2A agent
Args:
args: Command-line arguments
Returns:
Exit code (0 for success, non-zero for failure)
"""
try:
# Create streaming client
client = StreamingClient(args.endpoint)
# Create a simple text message
message = create_text_message(args.message)
print(f"Streaming response for: {args.message}")
print("-" * 50)
# Define callback for handling chunks
def print_chunk(chunk):
print(chunk, end="", flush=True)
# Run the streaming request using asyncio
async def stream_response():
async for chunk in client.stream_response(message, chunk_callback=print_chunk):
pass # Chunks are handled by the callback
print("\n" + "-" * 50)
# Run the async function
loop = asyncio.get_event_loop()
loop.run_until_complete(stream_response())
return 0
except A2AError as e:
print(f"Error: {str(e)}")
return 1
except Exception as e:
print(f"Unexpected error: {str(e)}")
return 1
def workflow_command(args: argparse.Namespace) -> int:
"""
Run an agent workflow
Args:
args: Command-line arguments
Returns:
Exit code (0 for success, non-zero for failure)
"""
try:
# Import workflow components
from .workflow import Flow
from .client import AgentNetwork
# Create agent network
agent_network = AgentNetwork()
# Add agents from arguments
if args.agents:
for agent_spec in args.agents:
try:
name, url = agent_spec.split("=", 1)
agent_network.add(name, url)
print(f"Added agent '{name}' from {url}")
except ValueError:
print(f"Error: Invalid agent specification '{agent_spec}'. Use format 'name=url'")
return 1
# Load workflow definition from script if provided
if args.script:
try:
import importlib.util
spec = importlib.util.spec_from_file_location("workflow_script", args.script)
module = importlib.util.module_from_spec(spec)
spec.loader.exec_module(module)
# Look for a create_workflow function in the module
if hasattr(module, 'create_workflow'):
# Create the workflow
flow = module.create_workflow(agent_network)
print(f"Loaded workflow from {args.script}")
else:
print(f"Error: No create_workflow function found in {args.script}")
return 1
except Exception as e:
print(f"Error loading script {args.script}: {e}")
return 1
else:
# No script provided, show error
print("Error: Workflow script is required. Use --script to specify a Python script.")
return 1
# Set initial context from JSON file if provided
initial_context = None
if args.context:
try:
with open(args.context, 'r') as f:
initial_context = json.load(f)
print(f"Loaded initial context from {args.context}")
except Exception as e:
print(f"Error loading context file {args.context}: {e}")
return 1
# Execute the workflow
print("Executing workflow...")
if args.async_mode:
# Run asynchronously
result = asyncio.run(flow.run(initial_context))
else:
# Run synchronously
result = flow.run_sync(initial_context)
# Print result
print("\nWorkflow result:")
if isinstance(result, dict):
print(json.dumps(result, indent=2))
else:
print(result)
return 0
except A2AError as e:
print(f"Error: {str(e)}")
return 1
except Exception as e:
print(f"Unexpected error: {str(e)}")
return 1
def network_command(args: argparse.Namespace) -> int:
"""
Manage an agent network
Args:
args: Command-line arguments
Returns:
Exit code (0 for success, non-zero for failure)
"""
try:
# Import AgentNetwork
from .client import AgentNetwork
# Create agent network
network = AgentNetwork(name=args.name)
# Add agents
if args.add:
for agent_spec in args.add:
try:
name, url = agent_spec.split("=", 1)
network.add(name, url)
print(f"Added agent '{name}' from {url}")
except ValueError:
print(f"Error: Invalid agent specification '{agent_spec}'. Use format 'name=url'")
return 1
# Discover agents
if args.discover:
count = network.discover_agents(args.discover)
print(f"Discovered {count} new agent(s)")
# List agents
agents_info = network.list_agents()
if agents_info:
print("\nAgent Network:")
for info in agents_info:
print(f"- {info['name']}: {info['url']}")
if 'description' in info:
print(f" Description: {info['description']}")
if 'skills_count' in info:
print(f" Skills: {info['skills_count']}")
print()
else:
print("No agents in the network")
# Save network to JSON file if requested
if args.save:
try:
# Simplify network for serialization
network_data = {
"name": network.name,
"agents": {
name: url for name, url in network.agent_urls.items()
}
}
# Fixed: Place the file object before the keyword argument
with open(args.save, 'w') as f:
json.dump(network_data, f, indent=2)
print(f"Saved agent network to {args.save}")
except Exception as e:
print(f"Error saving network to {args.save}: {e}")
return 1
return 0
except A2AError as e:
print(f"Error: {str(e)}")
return 1
except Exception as e:
print(f"Unexpected error: {str(e)}")
return 1
def parse_args() -> argparse.Namespace:
"""
Parse command-line arguments
Returns:
Parsed arguments
"""
parser = argparse.ArgumentParser(description="A2A command line tools")
subparsers = parser.add_subparsers(dest="command", help="Command to run")
# Send message command
send_parser = subparsers.add_parser("send", help="Send a message to an A2A agent")
send_parser.add_argument("endpoint", help="A2A endpoint URL")
send_parser.add_argument("message", help="Message text or JSON file path")
send_parser.set_defaults(func=send_command)
# Stream response command
stream_parser = subparsers.add_parser("stream", help="Stream a response from an A2A agent")
stream_parser.add_argument("endpoint", help="A2A endpoint URL")
stream_parser.add_argument("message", help="Message text to send")
stream_parser.set_defaults(func=stream_command)
# Common server arguments
server_args = argparse.ArgumentParser(add_help=False)
server_args.add_argument("--host", default="0.0.0.0", help="Host to bind to")
server_args.add_argument("--port", type=int, default=5000, help="Port to listen on")
server_args.add_argument("--debug", action="store_true", help="Enable debug mode")
# Start simple server command
serve_parser = subparsers.add_parser(
"serve",
help="Start a simple A2A server",
parents=[server_args]
)
serve_parser.set_defaults(func=serve_command)
# Start OpenAI server command
openai_parser = subparsers.add_parser(
"openai",
help="Start an OpenAI-powered A2A server",
parents=[server_args]
)
openai_parser.add_argument("--api-key", help="OpenAI API key (or set OPENAI_API_KEY)")
openai_parser.add_argument("--model", default="gpt-4", help="OpenAI model to use")
openai_parser.add_argument("--temperature", type=float, default=0.7, help="Generation temperature")
openai_parser.add_argument("--system-prompt", default="You are a helpful AI assistant.", help="System prompt")
openai_parser.set_defaults(func=openai_command)
# Start Anthropic server command
anthropic_parser = subparsers.add_parser(
"anthropic",
help="Start an Anthropic-powered A2A server",
parents=[server_args]
)
anthropic_parser.add_argument("--api-key", help="Anthropic API key (or set ANTHROPIC_API_KEY)")
anthropic_parser.add_argument("--model", default="claude-3-opus-20240229", help="Anthropic model to use")
anthropic_parser.add_argument("--temperature", type=float, default=0.7, help="Generation temperature")
anthropic_parser.add_argument("--max-tokens", type=int, default=1000, help="Maximum tokens to generate")
anthropic_parser.add_argument("--system-prompt", default="You are a helpful AI assistant.", help="System prompt")
anthropic_parser.set_defaults(func=anthropic_command)
# Start MCP server command
mcp_parser = subparsers.add_parser(
"mcp-serve",
help="Start an MCP server",
parents=[server_args]
)
mcp_parser.add_argument("--name", default="MCP Server", help="Server name")
mcp_parser.add_argument("--version", default="1.0.0", help="Server version")
mcp_parser.add_argument("--description", default="MCP Server", help="Server description")
mcp_parser.add_argument("--script", help="Python script with MCP tools")
mcp_parser.set_defaults(func=mcp_command)
# Start MCP-enabled A2A agent command
mcp_agent_parser = subparsers.add_parser(
"mcp-agent",
help="Start an MCP-enabled A2A agent",
parents=[server_args]
)
mcp_agent_parser.add_argument("--name", default="MCP-Enabled Agent", help="Agent name")
mcp_agent_parser.add_argument("--description", default="MCP-Enabled A2A Agent", help="Agent description")
mcp_agent_parser.add_argument("--config", help="JSON config file for MCP servers")
mcp_agent_parser.add_argument("--servers", nargs="*", help="MCP servers in format 'name=url'")
mcp_agent_parser.add_argument("--script", help="Python script with agent implementation")
mcp_agent_parser.set_defaults(func=mcp_agent_command)
# Call MCP tool command
mcp_call_parser = subparsers.add_parser(
"mcp-call",
help="Call an MCP tool directly"
)
mcp_call_parser.add_argument("endpoint", help="MCP server endpoint URL")
mcp_call_parser.add_argument("tool", help="Tool name to call")
mcp_call_parser.add_argument("--params", nargs="*", help="Parameters in format 'name=value'")
mcp_call_parser.set_defaults(func=mcp_call_command)
# Run workflow command
workflow_parser = subparsers.add_parser(
"workflow",
help="Run an agent workflow"
)
workflow_parser.add_argument("--script", required=True, help="Python script with workflow definition")
workflow_parser.add_argument("--agents", nargs="*", help="Agents in format 'name=url'")
workflow_parser.add_argument("--context", help="JSON file with initial context data")
workflow_parser.add_argument("--async-mode", action="store_true", help="Run workflow in async mode")
workflow_parser.set_defaults(func=workflow_command)
# Manage agent network command
network_parser = subparsers.add_parser(
"network",
help="Manage an agent network"
)
network_parser.add_argument("--name", default="Agent Network", help="Name for the agent network")
network_parser.add_argument("--add", nargs="*", help="Add agents in format 'name=url'")
network_parser.add_argument("--discover", nargs="*", help="Discover agents from URLs")
network_parser.add_argument("--save", help="Save network to JSON file")
network_parser.set_defaults(func=network_command)
return parser.parse_args()
def main() -> int:
"""
Main entry point for the CLI
Returns:
Exit code (0 for success, non-zero for failure)
"""
args = parse_args()
if not args.command:
print("Error: No command specified")
sys.exit(1) # Add this line to exit with error code
if not hasattr(args, 'func'):
print(f"Error: Unknown command '{args.command}'")
return 1
return args.func(args)
if __name__ == "__main__":
sys.exit(main())