Natural Language vs Deterministic Interfaces for LLMsKey Points

Natural language interfaces for LLMs are powerful but can be problematic for software engineering and automation

Benefits of natural language:

• Flexible input handling
• Accessible to non-technical users
• Works well for casual text manipulation tasks

Challenges with natural language:

• Lacks deterministic behavior needed for automation
• Difficult to express complex logic
• Results can vary with slight prompt changes
• Not ideal for command-line tools or batch processing

Proposed Solution: YAML-Based Interface

• YAML offers advantages as an LLM interface:
  • Structured key-value format
  • Human-readable like Python dictionaries
  • Can be linted and validated
  • Enables unit testing and fuzz testing
  • Used widely in build systems (e.g., Amazon CodeBuild)

Implementation Suggestions

• Create directories of YAML-formatted prompts
• Build prompt templates with defined sections
• Run validation and tests for deterministic behavior
• Consider using with local LLMs (Ollama, Rust Candle, etc.)
• Apply software engineering best practices

Conclusion

Moving from natural language to YAML-structured prompts could improve determinism and reliability when using LLMs for automation and software engineering tasks.

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