System Prompt Linter

Paste a system prompt or agent instruction and get a quality score with 10 specific fixes.

Result Updates as you type · runs in your browser

Calculating…

Who uses it, and for what

AI builder

Check an agent prompt before it goes live, when changes are still cheap.

Team lead

Review prompts written by teammates with the same 10 criteria every time.

Support

Find out why a chatbot answers inconsistently: missing format and missing fallback are the usual causes.

Runs 10 checks

Role, output format, length, examples, explicit rules, a fallback when unsure, vague words, shouting in capitals, structure and enough detail.

Scores the prompt

Each passed check adds to a score out of 100, so you can compare versions.

Tells you what to change

Every failed check comes with a specific rewrite hint, not just a red flag.

Does a high score guarantee good answers?

No. It means the prompt follows practices that make results more reliable. Always test with real inputs, including odd ones.

Why are capitals flagged?

Older advice was to SHOUT important rules. Current models follow calm, specific instructions better, and shouting can make them over-apply a rule.

Is the prompt stored?

No, the check runs in your browser.

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Done for you

We build the workflow behind tools like this one, wired to your CRM, inbox and apps, and keep it running. Fixed price, from $390 a month.