Dynamic Prompt Variables: Write AI Templates That Work Every Time

A static saved prompt is a head start. A prompt with dynamic variables is a workflow.

The difference comes down to one question: does your saved prompt require you to manually insert the relevant context each time, or does it pick it up automatically? If it's the former, you're still doing the tedious part — you've just moved it.

Dynamic prompt variables solve this. Here's what they are, how they work, and how to build templates that actually get better with every use.

The Problem with Static Prompt Templates

Most people who start saving prompts run into the same pattern. They save a prompt like:

"Review this code for bugs, edge cases, and security issues:"

And then, when they want to use it, they fire the prompt, paste it into ChatGPT or Claude, and then manually paste in the code block below it. Two paste operations, a bit of cursor navigation, maybe some reformatting.

It works. But it's not really a reusable template — it's just a stored prefix. The variable part (the code itself) still requires manual work every time.

Dynamic variables collapse this into a single action.

The Core Variable Types

{{clipboard}} — Inject What You've Copied

This is the highest-value variable for most workflows. It captures whatever is currently on your clipboard and injects it directly into the prompt at paste time.

Without it:

1. Copy the code block
2. Open your AI tool
3. Type or paste your prompt text
4. Paste the code block below it

With {{clipboard}}:

1. Copy the code block
2. Fire your prompt with Cmd+Shift+P → "Code Review"
3. Done — the prompt and code paste together in one action

The resulting prompt sent to the AI looks like:

"Review this code for bugs, edge cases, and security issues:

function calculateTotal(items) {
  return items.reduce((sum, item) => sum + item.price, 0)
}
```"

You didn't type any of that. Copy, fire, done.

Practical templates using {{clipboard}}:

• "Summarize this in 3 bullet points for a non-technical audience: {{clipboard}}"
• "Fix grammar and spelling. Keep my voice and don't change the meaning: {{clipboard}}"
• "Translate this to Spanish, maintaining a professional tone: {{clipboard}}"
• "What are the top 5 action items from this text: {{clipboard}}"
• "Critique the logical structure of this argument: {{clipboard}}"
• "Debug this error and explain what caused it: {{clipboard}}"

Any prompt that involves processing something you have in front of you is a candidate for {{clipboard}}.

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{{date}} — Today's Date

Injects the current date at paste time. Useful for anything that needs temporal grounding — reports, emails that reference timing, meeting prep.

Formats depending on your prompt manager:

• {{date}} → 2026-03-19
• {{date:MMM DD, YYYY}} → Mar 19, 2026
• {{date:dddd}} → Thursday

Templates using {{date}}:

• "Today is {{date}}. Write a Monday morning team update covering..."
• "Draft a follow-up email. I sent the original on {{date}}..."
• "It's {{date}}. What should I be aware of for end-of-quarter planning..."

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{{time}} and {{datetime}}

Same idea as {{date}} but for time-sensitive contexts.

• {{time}} → 14:30
• {{datetime}} → 2026-03-19 14:30

Useful for timestamping log entries, incident reports, or anything where the exact time matters.

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{{variableName}} — Custom Input Variables

The most flexible type. When you include a custom variable in your template, a small input field appears before the prompt is pasted, asking you to fill in that specific value.

Template: "Write a LinkedIn post announcing {{announcement:our product launch}}"

When you fire this prompt, you get a small dialog: announcement: [our product launch]. The default is pre-filled. You can accept it, modify it, or replace it entirely. Hit Enter and the prompt pastes with your input injected.

Why custom variables matter:

They let you build semi-generic templates that still require one specific piece of input each time. Instead of building 12 slightly different versions of the same prompt for different topics, you build one template with a variable.

Practical templates using custom variables:

• "Write 5 subject line options for an email about {{topic}}"
• "Explain {{concept}} as if the reader is a smart 12-year-old"
• "Draft a cold outreach email to a {{role:VP of Marketing}} at a {{company_type:B2B SaaS}} company"
• "Write a job description for a {{role}} with {{years:3-5}} years of experience"

The default values (after the colon) mean you can accept quickly for the common case and only change when you need something different.

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Building a Template Library That Compounds

The best prompt templates tend to have a few things in common:

They separate instruction from content. The instruction (what to do) is in the template. The content (what to do it to) comes from the clipboard or a variable. When these are cleanly separated, the template stays useful for a long time.

They specify format explicitly. "Summarize this" produces unpredictable output. "Summarize this in exactly 3 bullet points, each under 20 words, written for a non-technical stakeholder" produces consistent, usable output. The more specific the template, the less post-editing you do.

They handle the most common case by default. If your code review prompt needs to specify a language 80% of the time, include the most common language as a default variable value. Reduce the friction for the typical case.

They're named for how you'd search for them. When you need a prompt, you'll search by the action: "summarize", "review code", "fix grammar". Name your templates with verbs. "Summarize for Non-Technical Audience" is better than "Summary Template #3".

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The Retrieval Part

Good templates only work if you can get to them fast. The setup that works: a global keyboard shortcut that opens a fuzzy search interface over your current app, finds the right prompt in a keystroke or two, resolves all the variables, and pastes the result.

Promptzy handles this on Mac — Cmd+Shift+P from any app, search your prompt library, and the selected template (with {{clipboard}} and other variables resolved) pastes into your active window. Variables with custom inputs show a small fill-in dialog before pasting.

The whole flow from "I need this prompt" to "it's in ChatGPT" is under 2 seconds. That speed difference is what makes templates actually become habits rather than systems you maintain but don't use.

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A Starter Set of Dynamic Templates

Here's a practical set to get started with. Copy these as-is or adapt them:

Summarize — "Summarize the following in 3 bullet points, each under 20 words: {{clipboard}}"

Fix writing — "Fix any grammar, spelling, or punctuation errors. Keep my voice and sentence rhythm: {{clipboard}}"

Code review — "Review this code for bugs, edge cases, security issues, and readability. Be specific: {{clipboard}}"

Explain simply — "Explain the following to someone with no technical background. Use an analogy if helpful: {{clipboard}}"

Email reply — "Write a professional reply to this email. Tone: {{tone:friendly but direct}}. Action: {{action:schedule a call}}: {{clipboard}}"

Debug error — "I'm getting this error. Explain what's causing it and suggest a fix: {{clipboard}}"

Meeting action items — "Extract all action items from this meeting transcript. Format as a bulleted list with owner and deadline where mentioned: {{clipboard}}"

Start with these, use them for a week, and you'll naturally start building more specialized ones for your specific workflow.