Get started with Claude Managed Agents

AGENT_ID=$(ant beta:agents create \
  --name "Coding Assistant" \
  --model '{id: claude-opus-5}' \
  --system "You are a helpful coding assistant. Write clean, well-documented code." \
  --tool '{type: agent_toolset_20260401}' \
  --transform id --raw-output)

echo "Agent ID: $AGENT_ID"

ENVIRONMENT_ID=$(ant beta:environments create \
  --name "quickstart-env" \
  --config '{type: cloud, networking: {type: unrestricted}}' \
  --transform id --raw-output)

echo "Environment ID: $ENVIRONMENT_ID"

session = client.beta.sessions.create(
    agent=agent.id,
    environment_id=environment.id,
    title="Quickstart session",
)

print(f"Session ID: {session.id}")

with client.beta.sessions.events.stream(session.id) as stream:
    # Send the user message after the stream opens
    client.beta.sessions.events.send(
        session.id,
        events=[
            {
                "type": "user.message",
                "content": [
                    {
                        "type": "text",
                        "text": "Create a Python script that generates the first 20 Fibonacci numbers and saves them to fibonacci.txt",
                    },
                ],
            },
        ],
    )

    # Process streaming events
    for event in stream:
        match event.type:
            case "agent.message":
                for block in event.content:
                    print(block.text, end="")
            case "agent.tool_use":
                print(f"\n[Using tool: {event.name}]")
            case "session.status_idle":
                print("\n\nAgent finished.")
                break