improvement by using 'anyhow' instead of 'Box dyn Error' :

fn load_config(file_path: &str) -> Result<MachineConfig> {
    let config_str = fs::read_to_string(file_path)
        .with_context(|| format!("Failed to read configuration file: {}", file_path))?;
    let config: MachineConfig = match file_path.rsplit('.').next().ok_or_else(|| anyhow::anyhow!("No file extension found"))? {
        "toml" => toml::from_str(&config_str)
            .with_context(|| format!("Failed to parse TOML configuration file: {}", file_path))?,
        _ => return Err(anyhow::anyhow!("Unsupported file format: {}", file_path)),
    };
    Ok(config)
} 

improvement by using 'anyhow' instead of 'Box dyn Error' :

fn load_config(file_path: &str) -> Result<MachineConfig> {
    let config_str = fs::read_to_string(file_path)
        .with_context(|| format!("Failed to read configuration file: {}", file_path))?;
    let config: MachineConfig = match file_path.rsplit('.').next().ok_or_else(|| anyhow::anyhow!("No file extension found"))? {
        "toml" => toml::from_str(&config_str)
            .with_context(|| format!("Failed to parse TOML configuration file: {}", file_path))?,
        _ => return Err(anyhow::anyhow!("Unsupported file format: {}", file_path)),
    };
    Ok(config)
} 

@Esgr0bar can you add anyhow::Error in the Result? And you can use anyhow::Context instead of the macro anyhow::anyhow!