Update an extraction field

curl -X PATCH "https://api.nedzo.ai/v1/agents/123e4567-e89b-12d3-a456-426614174000/extraction-fields/2c4e6f80-1a3b-4c5d-8e9f-0a1b2c3d4e5f" \
    -H "Authorization: Bearer YOUR_API_KEY" \
    -H "Content-Type: application/json" \
    -d '{ "description": "The budget the caller gives, in dollars" }'

{
  "id": "2c4e6f80-1a3b-4c5d-8e9f-0a1b2c3d4e5f",
  "agentId": "123e4567-e89b-12d3-a456-426614174000",
  "name": "budget",
  "type": "number",
  "description": "The budget the caller gives, in dollars",
  "targetContactField": null,
  "targetCustomVariableId": "0e1f2a3b-4c5d-4e6f-8a9b-0c1d2e3f4a5b",
  "createdAt": "2026-10-11T10:00:00Z",
  "updatedAt": "2026-10-11T10:00:00Z"
}