> ## Documentation Index
> Fetch the complete documentation index at: https://docs.crazyrouter.com/llms.txt
> Use this file to discover all available pages before exploring further.

# Gemini Tools

> Gemini native tool capabilities verified against Crazyrouter production on 2026-03-23

> Дата обновления: 2026-06-06

# Gemini Tools

```
POST /v1beta/models/{model}:generateContent
```

As of March 23, 2026, Crazyrouter production has verified that `gemini-3.1-pro` can reliably trigger these Gemini-native tool capabilities:

* `codeExecution`
* `googleSearch`
* `urlContext`
* `functionDeclarations`

<Note>
  This page keeps only request patterns and response markers that were reproduced against production.
</Note>

***

## Code Execution

The following request returned both `executableCode` and `codeExecutionResult` in production:

```bash theme={null}
curl "https://api.crazyrouter.com/v1beta/models/gemini-3.1-pro:generateContent?key=YOUR_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
    "contents": [
      {
        "role": "user",
        "parts": [
          {"text": "Use code execution. Compute the sum of the first 20 prime numbers and state the result."}
        ]
      }
    ],
    "tools": [
      {
        "codeExecution": {}
      }
    ]
  }'
```

Observed response shape:

```json theme={null}
{
  "candidates": [
    {
      "content": {
        "parts": [
          {
            "executableCode": {
              "language": "PYTHON",
              "code": "..."
            }
          },
          {
            "codeExecutionResult": {
              "outcome": "OUTCOME_OK",
              "output": "639\n"
            }
          },
          {
            "text": "The sum is 639."
          }
        ]
      }
    }
  ]
}
```

***

## Google Search

The following request returned `groundingMetadata` in production, confirming that Google Search was actually used:

```bash theme={null}
curl "https://api.crazyrouter.com/v1beta/models/gemini-3.1-pro:generateContent?key=YOUR_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
    "contents": [
      {
        "role": "user",
        "parts": [
          {"text": "Use Google Search. What are two AI news items from March 2026?"}
        ]
      }
    ],
    "tools": [
      {
        "googleSearch": {}
      }
    ]
  }'
```

Current markers to check:

* `candidates[0].groundingMetadata`
* Normal text output in `candidates[0].content.parts[*].text`

***

## URL Context

The following request returned `urlContextMetadata` in production, along with `groundingMetadata`:

```bash theme={null}
curl "https://api.crazyrouter.com/v1beta/models/gemini-3.1-pro:generateContent?key=YOUR_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
    "contents": [
      {
        "role": "user",
        "parts": [
          {"text": "Use URL context to summarize https://example.com/ in one sentence."}
        ]
      }
    ],
    "tools": [
      {
        "urlContext": {}
      }
    ]
  }'
```

Current markers to check:

* `candidates[0].urlContextMetadata`
* `candidates[0].groundingMetadata`

***

## Custom Function Calling

The following request returned `functionCall` in production:

```bash theme={null}
curl "https://api.crazyrouter.com/v1beta/models/gemini-3.1-pro:generateContent?key=YOUR_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
    "contents": [
      {
        "role": "user",
        "parts": [
          {"text": "What is the weather in Beijing? Use the provided function."}
        ]
      }
    ],
    "tools": [
      {
        "functionDeclarations": [
          {
            "name": "get_weather",
            "description": "Get weather info for a city",
            "parameters": {
              "type": "object",
              "properties": {
                "city": {
                  "type": "string"
                }
              },
              "required": ["city"]
            }
          }
        ]
      }
    ]
  }'
```

Observed response shape:

```json theme={null}
{
  "candidates": [
    {
      "content": {
        "parts": [
          {
            "functionCall": {
              "name": "get_weather",
              "args": {
                "city": "Beijing"
              }
            }
          }
        ]
      }
    }
  ]
}
```

To continue the tool loop, send the tool result back with Gemini-native `functionResponse`.