PromptSharp
Issue #008 · Sat, Jul 4, 2026
Sharpen how you instruct AI — from your first prompt to full agents. |
⚡ What's new this week Today's technique still applies — here's the latest to apply it to. |
Output format control: stop parsing prose, demand structure |
What you'll learn
If software will read it, demand JSON — and forbid the friendly wrapper. |
If you ever copy-paste an AI answer into a spreadsheet or your code, you're doing it wrong — make it emit structure. |
▸ See it in action — copy-paste this
Extract structured data from the text below.
Return ONLY a JSON object matching this schema exactly — no markdown fences, no explanation:
{
"company": string,
"funding_round": string | null,
"amount_usd": number | null,
"investors": string[],
"date": "YYYY-MM-DD" | null
}
If a field is unknown, use null. Do not invent values.
Text:
"""
[paste article or paragraph]
""" |
▸ Why it works
An AI that returns a friendly paragraph is unusable by software. The fix is to specify the exact output shape: a JSON object with named fields, or a markdown table with fixed columns. Two rules make this reliable: (1) show the literal schema, and (2) add 'Return ONLY the JSON, no markdown fences, no commentary.' Models love to wrap JSON in chatter — explicitly forbid it. For data tasks this turns the model into an API you can pipe into anything. |
▸ Level it up
New to this: Tell the AI 'give me a table with these columns: X, Y, Z' or 'reply as JSON'. Structured output is copy-paste ready into Sheets or code.
Vibe coder: Paste the literal schema and add 'Return ONLY the JSON, no fences, no commentary.' Use null for unknowns so you never get a hallucinated value.
Advanced: Use native structured-output / JSON-mode / tool-schema features when the model offers them (constrained decoding) instead of trusting the prompt alone. Validate against your schema on receipt and auto-retry with the validation error appended. |
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▶️ Pro audio
Narrated audio is rolling out
Every issue read end-to-end, plus a private podcast feed for Apple Podcasts, Spotify, or Overcast — landing in your Pro subscription soon.
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Want this done for you — automatically, on every task?
Brainfile installs an AI operating system that runs your business and gets sharper every day.
Meet Brainfile → |
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Want every prompt pre-filled for your role?
Tell us your role & industry once — we're rolling out personalized prompts so each one comes pre-filled with your context. Free, no account. Get on the early list:
Set up personalization → |
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Know someone who'd sharpen their prompts with this?
Forward it. Refer 3 friends and we'll send you our private prompt-pack.
Refer & get the prompt-pack → |
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