How I Built an AI Agent That Writes Personalised Freelance Cover Letters with Runner H

This is a submission for the Runner H "AI Agent Prompting" Challenge

🚩 The Problem: Freelancers Waste Time Writing Cover Letters

If you're a freelancer like me, you know the drill:
You see a gig, get excited, then... spend 20–30 minutes crafting a unique cover letter.
Repeat that a few times a day, and it becomes a major productivity drain.

I wanted to automate this — but not with generic templates.
I wanted tailored, high-quality cover letters that actually speak to the job.

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🧰 The Tools

This project uses:

• Runner H (AI agent platform by Vercel)
• Google Docs (to host my resume and job descriptions)
• Gmail (optional – to email the letter to myself or clients)

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🛠️ How the Agent Works

First, I connected Google Docs and Gmail to Runner H — this allowed the agent to read documents and (optionally) send emails on my behalf.

Then, I created two Google Docs:

• portfolio: contains my freelance resume / experience

• job: contains the client's job post or project details

For Demonstration purpose, I put down my second email [e-mail]

Once the connections were set up, I gave Runner H this simple prompt:

"I have Portfolio and job description of a freelance gig hosted on my Google Docs named portfolio (Doc-id) and job (Doc-id).

Based on that, create a cover letter for the freelance gig, save it in a new document named Cover-letter, and email it — if the client's email is mentioned in the job description, send it there. Otherwise, send the cover letter to my email address."

That’s it — and within seconds, it generated a high-quality, job-specific cover letter and saved it in my Google Docs. No extra steps, no editing needed.

Once the Runner was completed, a mail was sent from my mail [e-mail] to [e-mail]

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📹 Demo

Here's a Youtube Video for the Demo:

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⏱️ Result: 30 Minutes Saved. Every. Single. Time.

Before: Write, edit, proofread — 20–30 mins per application.
Now: 1 prompt. 10 seconds. Done.

Imagine applying to 5 gigs in 5 minutes.
That’s the power of AI agents when used right.

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💬 Bonus Quote

“Runner H now writes my proposals while I sleep.”

Here's the Tweet/Post on my Handle:

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🚀 Want to Try It?

If you're a freelancer, or just someone tired of writing repetitive emails, try Runner H + Google Docs. You can build this agent in under 10 minutes.

Comments

[Mohamed Nizzad]

This is a good use case for freelancers where freelancing often gets billed on hourly after accepting the contract. Hence, this will save hours for freelancers, eliminate unbilled hours thus increase earnings.

[Pravesh Sudha]

Glad to hear 🌟

[Kusal Darshana]

Great work

[Pravesh Sudha]

Thanks mate!