Prompt Iteration
definition
The process of systematically improving prompts through testing, measurement, and refinement rather than ad-hoc trial and error. Effective prompt iteration treats prompts as code — using version control, evaluation suites, and A/B testing to converge on optimal instructions rather than relying on intuition or anecdotal feedback.
The process of systematically improving prompts through testing, measurement, and refinement rather than ad-hoc trial and error. Effective prompt iteration treats prompts as code — using version control, evaluation suites, and A/B testing to converge on optimal instructions rather than relying on intuition or anecdotal feedback. Small changes to prompts can produce large, non-obvious changes in agent behavior, making disciplined iteration essential for building reliable systems. The developers who get the best results from agentic tools are those who instrument their prompts, measure outputs quantitatively, and iterate based on data rather than gut feeling. This concept connects to eval-driven development for building measurement infrastructure around prompts, agent config files for version-controlling prompt context, and system prompts for understanding the primary prompt surface area to iterate on.