<p>Attaches the specified managed policy to the specified IAM role. When you attach a managed policy to a role, the managed policy becomes part of the role's permission (access) policy.</p> <note> <p>You cannot use a managed policy as the role's trust policy. The role's trust policy is created at the same time as the role, using <a>CreateRole</a>. You can update a role's trust policy using <a>UpdateAssumeRolePolicy</a>.</p> </note> <p>Use this operation to attach a <i>managed</i> policy to a role. To embed an inline policy in a role, use <a>PutRolePolicy</a>. For more information about policies, see <a href="https://docs.aws.amazon.com/IAM/latest/UserGuide/policies-managed-vs-inline.html">Managed policies and inline policies</a> in the <i>IAM User Guide</i>.</p> <p>As a best practice, you can validate your IAM policies. To learn more, see <a href="https://docs.aws.amazon.com/IAM/latest/UserGuide/access_policies_policy-validator.html">Validating IAM policies</a> in the <i>IAM User Guide</i>.</p>

{
  "success": true,
  "data": {
    "id": "abc123",
    "created_at": "2025-01-01T00:00:00Z"
  }
}

{
  "success": false,
  "error": {
    "code": "VALIDATION_ERROR",
    "message": "Invalid request parameters"
  }
}