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Design a Word Game With AI Players That Shrugs Off Prompt Injection

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The prompt

I'm building a [type of game, e.g. party word-guessing game] where some seats can be played by an LLM. Players type free text (clues, guesses, chat) that ends up in the model's input. Help me design it so a player typing instructions to the bot can't do much harm: 1. Threats: list what a player could try (fake system text, asking for the prompt, making the bot pick a target answer, making it waste API calls) and the worst realistic outcome of each. 2. Design fixes first: limit what the model can do (pick from a fixed list, structured JSON output, validation in code), so a bad input at worst causes one wrong move. 3. Input handling: length limits, allowed characters, and how to pass player text clearly marked as data. 4. Cost controls: who can trigger paid calls, per-user daily caps, guest limits. 5. A short system prompt for the AI player, and 6 hostile test inputs with the expected safe behaviour. Stack: [language/framework]. Keep it practical; no filters that a small team can't maintain.

Why this prompt

• Hand-picked, editorially reviewed prompt
• Written for Claude, ChatGPT, Gemini

Source

Created by BestPromptFinder — editorial prompt, not user-generated. See our content & source policy.

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