Spec Sheet for a Custom GPT, Claude Project or Gemini Gem: Write Instructions That Get Usable Answers

Your custom assistant gives long, vague, sometimes wrong answers because the instructions say “help me with HR.” This spec sheet makes you decide the job, the inputs, the output, the rules and the tests before you build, in about 20 minutes.

What you get

• 12-field spec sheet: job, user, inputs, output format, voice, always rules, never rules, when unsure, out of scope, reference files, starter prompts, owner.
• Filled example: a Job Post Reviewer for a fictional dental practice, with the finished instruction text of about 130 words.
• Copy-and-paste template: a .txt file with the instruction skeleton for the instructions field.
• 5 test cases and a fix table: how to tell a failing assistant from a working one and what to change.
• Privacy and rollout checklist: 7 checks and a 3 week rollout.

How it works

1. Fill the 12 fields in plain words.
2. Paste the finished text into the instructions field.
3. Run the 5 tests, fix, and log the change.

Requirements

A PDF reader and a text editor. Works with any assistant builder that has an instructions field. You supply your own account.

What it is not

A template and guide, not an AI product or a rating of any tool. Menu names change, so check the tool’s help page. Never paste personal, health or pay data into an unapproved tool.

Digital products: no refunds once downloaded. A corrupted, incomplete or not-as-described file reported within 14 days of purchase is replaced or refunded in full. Refunds return to your original payment method within ten business days.