curl https://api.saturn-pay.com/v1/agents/agt_abc123 \
  -H "Authorization: Bearer sk_agt_..."

const agentId = 'agt_abc123';
const response = await fetch(`https://api.saturn-pay.com/v1/agents/${agentId}`, {
  headers: { 'Authorization': 'Bearer sk_agt_...' }
});

const agent = await response.json();

{
  "id": "agt_abc123",
  "name": "research-agent",
  "killed": false,
  "createdAt": "2024-01-15T10:30:00Z",
  "lastActiveAt": "2024-01-20T14:22:00Z"
}

{
  "error": {
    "code": "NOT_FOUND",
    "message": "Agent not found"
  }
}