> ## Documentation Index
> Fetch the complete documentation index at: https://docs.mythic-c2.net/llms.txt
> Use this file to discover all available pages before exploring further.

# 3. Configuration Checks

Check Agent's Configuration Before Generation

## What is this?

Configuration checks are optional checks implemented by a C2 profile to alert the operator if they're generating an agent with a C2 configuration that doesn't match the current server configuration.

## When does this happen?

This check occurs every time an agent is generated, and this output is added to the payload's `build_message`. Thus, an operator sees it when generating a payload, but it's always viewable again from the created payloads page.

## What does it look like?

The function is part of your C2 Profile's class definition, so it has access to your local `config.json` file as well as the instance configuration from the agent.

<Tabs>
  <Tab title="Python">
    ```python theme={"system"}
    async def config_check(request: C2ProfileBase.C2ConfigCheckMessage) -> C2ProfileBase.C2ConfigCheckMessageResponse:
        return C2ProfileBase.C2ConfigCheckMessageResponse(
            Success=True,
            Message="Some configuration check message",
            )
    ```
  </Tab>

  <Tab title="Golang">
    ```go theme={"system"}
    ConfigCheckFunction        func(message C2ConfigCheckMessage) C2ConfigCheckMessageResponse
    ```

    ```go theme={"system"}
    package c2structs

    // C2_CONFIG_CHECK STRUCTS

    type C2ConfigCheckMessage struct {
       C2Parameters
    }

    type C2ConfigCheckMessageResponse struct {
       Success bool   `json:"success"`
       Error   string `json:"error"`
       Message string `json:"message"`
    }
    ```
  </Tab>
</Tabs>