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Invalid Prompt Input Error

Error Code: INVALID_PROMPT_INPUT

This error occurs when the prompt provided to a language model contains invalid characters, formatting, or structure.

Common Causes​

  1. Invalid Characters: The prompt contains characters that the model doesn't support
  2. Encoding Issues: The prompt has incorrect character encoding
  3. Format Violations: The prompt doesn't follow the expected format for the model
  4. Length Limits: The prompt exceeds the model's maximum input length

Solutions​

1. Check Character Encoding​

use ferriclink_core::FerricLinkError;

// Ensure proper UTF-8 encoding
let prompt = "Your prompt here".to_string();
// Check for invalid characters
if !prompt.is_char_boundary_valid() {
    return Err(FerricLinkError::invalid_prompt_input("Invalid character encoding"));
}

2. Validate Prompt Format​

fn validate_prompt(prompt: &str) -> Result<(), FerricLinkError> {
    // Check for required format elements
    if !prompt.contains("System:") && !prompt.contains("Human:") {
        return Err(FerricLinkError::invalid_prompt_input(
            "Prompt must contain System: or Human: markers"
        ));
    }
    
    // Check length limits
    if prompt.len() > 10000 {
        return Err(FerricLinkError::invalid_prompt_input(
            "Prompt exceeds maximum length of 10,000 characters"
        ));
    }
    
    Ok(())
}

3. Sanitize Input​

fn sanitize_prompt(prompt: &str) -> String {
    prompt
        .chars()
        .filter(|c| c.is_ascii() || c.is_alphanumeric())
        .collect()
}

Prevention​

  • Always validate prompts before sending to models
  • Use proper encoding (UTF-8)
  • Check model-specific requirements
  • Implement length validation
  • Sanitize user inputs