Handoff
Approve what the agent is about to do
Problem
An agent is about to send the email, issue the refund, or delete the branch. Right now the choice is to let it act unattended and find out later, or to babysit the terminal. Neither is a policy, and one of them is how a Friday gets ruined.
Why now
Agents crossed from suggesting to acting in 2026, and the tooling for the moment in between never got built. Every team writing agents rebuilds this badly, in Slack, with no audit trail.
Solution
A pause with a phone in it. The agent calls one endpoint before an irreversible action, the request lands on your phone with the exact diff of what will happen, and you approve or refuse. Timeouts refuse by default, because the safe answer to silence is no.
Who it is for
A small team whose agents already have write access to something that matters: money, customers, or production. They discovered the gap the first time an agent nearly sent something, and their current policy is a person watching a terminal, which is not a policy. They are not looking to slow their agents down. They want the one moment before an irreversible action to have a human in it.
What you could earn from Handoff
Say you build Handoff and charge your own customers $19 a month, the price the score suggests. The numbers below are the revenue that would come from them. This is money you earn, never a fee you pay UpgradIQ, and we never take a cut. It is arithmetic off the price, not a promise the customers arrive on their own.
See what Handoff produces
A pause with a phone in it. The agent calls one endpoint before an irreversible action, the request lands on your phone with the exact diff of what will happen, and you approve or refuse. Timeouts refuse by default, because the safe answer to silence is no.
Your build kit for Handoff
Start the build and the kit opens two steps in, then drip-feeds the rest one phase at a time. Every phase is a copy-paste prompt for your agent with its own verification before the next unlocks, so Handoff moves from an empty folder to a running MVP without you ever holding the whole plan in your head.
Progress saves across every device, and the workspace always reopens on the exact step you left, so a build that runs over several weeks survives them instead of dying in a browser tab you eventually close.
How you actually build it
Connect your coding agent once. It pulls the current phase straight from your kit over MCP: the exact prompt, the outcome to aim for, and the check to run before it moves on. You review and ship, it does the typing.
No copy-paste juggling, no thread to lose. The kit stays the single source of truth, and your agent works through it one phase at a time, verifying its own work at each step before the next phase is unlocked.
Take the context file, free
This is the AGENTS.md that keeps your coding agent on scope for the entire build: what Handoff is, who it is for, the stack, the non-goals, and the rules it must follow. Copy it into your project now, no account needed, and your agent is briefed before you write a line.
# Handoff Approve what the agent is about to do ## What this is A pause with a phone in it. The agent calls one endpoint before an irreversible action, the request lands on your phone with the exact diff of what will happen, and you approve or refuse. Timeouts refuse by default, because the safe answer to silence is no. ## The problem it solves An agent is about to send the email, issue the refund, or delete the branch. Right now the choice is to let it act unattended and find out later, or to babysit the terminal. Neither is a policy, and one of them is how a Friday gets ruined. ## Who it is for A small team whose agents already have write access to something that matters: money, customers, or production. They discovered the gap the first time an agent nearly sent something, and their current policy is a person watching a terminal, which is not a policy. They are not looking to slow their agents down. They want the one moment before an irreversible action to have a human in it. ## Stack Next.js + Supabase ## Non-goals Do not build features outside the core job above. This product exists to do one thing well. Every extra feature is a reason it does not ship. ## Rules for the agent - Build one phase at a time. Do not run ahead into later phases. - Validate input at every boundary where data enters. - Never put a permission or plan check in client code. - Ask before adding a dependency that a few lines would cover. - If something is ambiguous, say so rather than inventing a requirement. --- Context file from UpgradIQ · idea handoff · prompts kit-v4
Then start free to get the ten-phase kit and run the first prompt.
The path to a running MVP
Foundation
Scaffold the stack, then wire the data model and sign-in. It is the skeleton Handoff stands on, and it goes up in an evening rather than a lost week of config.
The product
Build the core feature end to end, then wire how it charges. This is where Handoff finally turns into something that a stranger will actually pay you for.
Ship it
Test and harden, deploy it live, then open the launch-day toolkit that lands the first ten users who prove it.
Is Handoff for you?
- You want revenue reasonably soon, not a science project
- You can give it evenings and a couple of weekends
- You can reach Teams with agents touching real systems
- You are not ready to talk to a first real customer
- You want it fully passive, with zero maintenance
- You expect it to find its own customers without you
The 3 sections that decide whether you should actually build it, plus the full kit, are one click away.
3 more sections decide whether you build Handoff
You have the case and the plan. Pro opens how it makes money, the one risk that kills it, and the build notes, plus the 10-phase kit that takes Handoff to a running MVP, on this idea and all 200.
How it makes money
Main risk
Build notes
What is free here, and what Pro unlocks
Frequently asked
Is Handoff actually validated?
It scored UIQ 83 with a GO verdict, weighed across eight sub-scores on the same rubric as every idea. GO means 75 and above, so demand and buildability were judged, not guessed.
What stack does it use?
Handoff is built on Next.js + Supabase, chosen because a coding agent can carry most of it. You are not fighting infrastructure, you are shipping the feature that matters.
How long to a running MVP?
The kit is ten phases, drip-fed one at a time so you always know the single next step. An evening and a weekend for the lighter builds, a few focused weeks for the deeper ones.
What does the $19 a month mean?
It is the price the model suggests Handoff could charge its own customers, not a fee to us. It is here so the money question is answered before you build, not after.
Which agent do I need?
Any capable coding agent: Claude Code, Cursor, Lovable, or Bolt. Every phase is a copy-paste prompt with its own check, so the agent does the typing and you keep the judgement.
What is free versus Pro?
The whole case above is free: the problem, timing, solution, buyer, and the full score. Pro adds how it makes money, the one risk that could kill it, and the full kit that carries Handoff from an empty folder to a running MVP.
More like Handoff
All 5 Agentic commerce ideasBuild Handoff, not just read about it
You have the problem, the timing, the solution and the buyer. A plan opens how it makes money, the risk that kills it, and the kit that takes it to a running MVP.
Start building Handoff