Which tool helps me write better AI prompts?

The assistant you already use, asked to improve its own prompt, does better than most prompt-generator apps. Paste your rough request into ChatGPT, Claude or Gemini and ask it to rewrite it as a clear prompt and to list the questions it needs answered first. Current models respond best to clear, specific instructions with the reason behind them and 3 to 5 examples, which is what a good prompt adds. Save prompts you reuse: as custom instructions or a Project in ChatGPT and Claude, and as skills in Gemini, which replace Gems from November 2026. Developers get OpenAI's prompt optimizer in the API dashboard, though its dataset-backed version shuts down with the Evals platform on 30 November 2026. The rule: no tool can supply the context only you have, so always add the goal, the audience and an example of good output.