Grouding on gemini 2 REST API

[jbg469]

I manage to curl a reply as so here

curl "https://generativelanguage.googleapis.com/v1beta/models/gemini-2.0-flash-exp:generateContent?key=KEY" \
  -H 'Content-Type: application/json' \
  -X POST \
  -d '{
    "contents": [{
      "parts":[{"text": "Write a story about a magic backpack."}]
    }]
  }'

---

this works for gemini 1.5

  echo '{"contents":
          [{"parts": [{"text": "What is the current Google stock price?"}]}],
      "tools": [{"google_search_retrieval": {
                  "dynamic_retrieval_config": {
                    "mode": "MODE_DYNAMIC",
                    "dynamic_threshold": 1,
                }
            }
        }
    ]
}' > request.json

curl -X POST "https://generativelanguage.googleapis.com/v1beta/models/gemini-1.5-pro-002:generateContent?key=KEY" \
-H "Content-Type: application/json" \
-d  @request.json > response.json

cat response.json

---- however with gemini 2.0 :

echo '{"contents":
          [{"parts": [{"text": "What is the current Google stock price?"}]}],
      "tools": [{"google_search": {
                  "dynamic_retrieval_config": {
                    "mode": "MODE_DYNAMIC",
                    "dynamic_threshold": 1,
                }
            }
        }
    ]
}' > request.json

curl -X POST "https://generativelanguage.googleapis.com/v1beta/models/gemini-2.0-flash-exp:generateContent?key=KEY" \
-H "Content-Type: application/json" \
-d  @request.json > response.json

cat response.json
  % Total    % Received % Xferd  Average Speed   Time    Time     Time  Current
                                 Dload  Upload   Total   Spent    Left  Speed
100   874    0   572  100   302   1568    828 --:--:-- --:--:-- --:--:--  2394
{
  "error": {
    "code": 400,
    "message": "Invalid JSON payload received. Unknown name \"dynamic_retrieval_config\" at 'tools[0].google_search': Cannot find field.",
    "status": "INVALID_ARGUMENT",
    "details": [
      {
        "@type": "type.googleapis.com/google.rpc.BadRequest",
        "fieldViolations": [
          {
            "field": "tools[0].google_search",
            "description": "Invalid JSON payload received. Unknown name \"dynamic_retrieval_config\" at 'tools[0].google_search': Cannot find field."
          }
        ]
      }
    ]
  }
}

---

I can't seem to find relevant docs on the REST API I am constrained to this version and can't use the python library at the moment

[holtskinner]

Hi, this is intended behavior. Dynamic Retrieval isn't compatible with Gemini 2.0 Flash. https://cloud.google.com/vertex-ai/generative-ai/docs/multimodal/ground-gemini#considerations