AI Instruction and Prompt Checker
Paste instructions for an AI assistant or agent and find conflicting rules, vague wording and duplicated sections. Free, private and instant.
How to use the AI Instruction and Prompt Checker
- Paste or type your input into the box above.
- Choose any options you need. Results update as you type.
- Copy the result with the Copy button.
About this tool
Long system prompts, custom instructions and agent rule files often contradict themselves. Paste yours and the checker looks for "always" and "never" rules that clash, vague wording, near-duplicate lines, shouting in capitals, very long lists and missing parts such as an output format or examples. It uses text rules rather than AI, so it flags things for you to review rather than judging quality. The text stays in your browser.
AI Instruction and Prompt Checker is part of ToolStack Hub's Text Tools. It runs entirely in your browser, which keeps your data private and makes results instant. There is nothing to install, no account to create and no usage limit.
Frequently asked questions
Does it use an AI model?
No. It compares your lines with text rules (overlapping words, opposite style words, vague terms), so it runs privately in your browser and is quick, but it cannot understand meaning perfectly.
Why are conflicting rules a problem?
When two rules disagree, the assistant has to guess which one to follow, and it may choose differently each time. Giving priorities or conditions removes the guesswork.
Is the AI Instruction and Prompt Checker free?
Yes. AI Instruction and Prompt Checker is completely free with no sign-up, limits or watermarks.
Is my data private when I use the AI Instruction and Prompt Checker?
Yes. It runs in your browser, so your input is not uploaded to our servers.
Does it work on mobile?
Yes. ToolStack Hub tools work on phones, tablets and desktop browsers.
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