import requests

url = "https://app.ubik-agent.com/api/v1/agent-sessions/{session_id}/skills"

payload = { "skill_ids": ["3c90c3cc-0d44-4b50-8888-8dd25736052a"] }
headers = {
    "X-API-KEY": "<api-key>",
    "Content-Type": "application/json"
}

response = requests.post(url, json=payload, headers=headers)

print(response.text)

{
  "detail": [
    {
      "loc": [
        "<string>"
      ],
      "msg": "<string>",
      "type": "<string>"
    }
  ]
}