Most projects break at the handoff

I've led developer teams for years now, first as a lead web developer and later running product delivery. When I think back to the releases that went badly, very few of them failed because someone wrote bad code. They failed when work changed hands.

A designer hands a layout to a developer and the hover states aren't in the file. A developer hands a feature to QA without saying which browser it was tested in. A project manager hands a client request to the team, and somewhere in the retelling "if possible" becomes "must have". Each step looks small. Stacked together they're where most of the delays I've lived through came from.

What a handoff loses

Every handoff compresses something. The person passing work on knows why a decision was made, which edge cases they already tried, and what they were worried about. The person receiving it gets the output and maybe a short note. The reasoning stays behind.

That missing reasoning is what causes rework. A developer "fixes" something that was deliberate. A tester passes a feature that only works with the test account. Everyone did their job well with the information they were given.

What changed when I put process around it

At LimitlessX, where I led the web team, we were shipping landing pages into paid traffic, so a broken release cost money within the hour. The changes that helped most were boring ones. We moved everything into version control so nothing lived only on someone's laptop. Every change went through code review before it merged. We added continuous integration so the obvious breakages were caught by a machine before a person had to find them.

Release errors dropped, because every handoff now went through a checkpoint that asked the questions people used to forget.

Making handoffs carry more

These are the habits I still use on every project, whether the team is two people or twelve.

1. Write down the "why" next to the "what". A one-line reason in a pull request or a ticket saves an hour of guessing later.
2. Define done before the work starts. If the acceptance criteria are agreed up front, the handoff becomes a check against a list instead of a debate.
3. Keep one source of truth. Specs in one place, designs in one place, decisions in one place. When the truth is spread across chat threads, every handoff starts with a search.
4. Review the work, and also review what was passed along with it. If a reviewer can't understand a change without asking the author, the handoff wasn't finished.

Agents have the same problem

These days part of my "team" is AI agents that build, review and test. They have exactly the same weakness people do, only more of it. An agent receives a task, does what the task says, and hands back a result with none of the context that would have stopped it from going wrong. Everything above applies to them twice over: clear specs, a definition of done, one source of truth and a review step.

The systems I design now treat every handoff, human or machine, as a place where information can drop. Once you start looking for those points in a project, they're easy to spot, and fixing them is usually cheaper than fixing the code.