One of the more noticeable changes with coding agents shows up when you sit down to pair with someone newer to the codebase for mentorship pair programming.
On the surface, things can look like they’re going unusually well. Code appears quickly, the structure is reasonable, and there are fewer moments where someone gets stuck trying to translate an idea into something that compiles. A lot of the friction that used to slow things down just isn’t there in the same way, and it’s easy to read that as progress.
What’s harder to see is that the places where someone can get lost haven’t gone away. They’ve shifted.
Before, the gaps were more visible. A junior developer would get stuck on syntax or on how to structure a piece of logic, and that would create a natural pause. You could step in, talk through it, and build up an understanding from there. Now the code often shows up already formed. It looks clean, it runs, and it follows recognizable patterns. From the outside, it can look like fluency.
The difference is that the code can move forward even when the underlying model hasn’t caught up. It’s easier to keep making progress without fully understanding what’s happening, because the agent is doing enough of the translation work to keep things moving.
That changes what you pay attention to as the more experienced person in the pair. It’s important to maintain tight feedback loops, and to pay attention to the right signals.
Faster Feedback, Faster Drift
Without an agent, going in the wrong direction tends to be slower. There are more points where someone has to stop and think, and those pauses create opportunities to correct course. With an agent, it’s possible to get a long way off track very quickly. The code keeps coming, and it often looks plausible enough that there isn’t an obvious signal to stop.
From the junior side of the pairing session, that can feel like progress. From the senior side, it often looks like momentum without a clear sense of direction.
Pairing is what brings those two views back together. Small questions start to matter more. What is this actually doing? What assumptions is it making? How does it connect to the rest of the system? Those questions aren’t new, but they need to show up earlier now, before too much builds on top of something that isn’t quite right.
Mentorship’s Changing Shape
The biggest shift is in what the junior developer needs from the interaction. As a senior developer, you are robbing your colleague of valuable learning and actively stunting their development if you’re not asking questions and probing for understanding the code an agent is producing for your pair.
It used to be that getting to a working solution was a meaningful part of the learning process. You had to wrestle with the problem, make mistakes, and gradually arrive at something that worked. That process exposed gaps in understanding in a way that was hard to miss.
Now, it’s much easier to arrive at something that works without going through that same process. The agent fills in gaps, suggests structure, and keeps things moving. The code looks reasonable, and it often is. The harder part is knowing whether it actually makes sense in the context of the system.
That’s where the pairing session slows down, and where the senior developer’s role becomes more visible.
Instead of focusing on how to write something, the conversation shifts toward understanding what’s already there. Walking through the flow, asking why something was written a certain way, or what would happen if the inputs changed. These are small questions, but they expose whether the understanding behind the code is solid or just inferred from what the agent produced.
Without that step, it’s easy for someone to start trusting output they don’t fully understand, simply because it looks correct.
Keeping the Bigger Picture Intact
That same dynamic shows up when you zoom out. Working with an agent encourages a kind of local thinking. You focus on the next step, ask for what you need, evaluate it, and move on. That cycle can repeat for quite a while without revisiting the bigger picture.
For someone still building context, that can lead to a fragmented understanding of the system. Each piece makes sense on its own, but the connections between them stay fuzzy.
Pairing creates space to step back and re-anchor. What problem are we solving, why this approach, how this fits with everything else. Those conversations aren’t always long, but they’re doing a different kind of work. They connect the immediate task to a larger mental model that the junior developer can build on.
It also changes how the work gets framed before you start. When you’re moving quickly, it’s easy to treat each step as its own small task and move on. Over time, that can blur the boundaries of what you’re actually trying to accomplish. For someone with less context, that makes it harder to tell whether a given solution is appropriate, because the criteria for “correct” are never stated clearly.
Pairing tends to push in the opposite direction. You spend more time up front making sure there’s a shared understanding of what you’re doing and why it matters. That context becomes the reference point for evaluating everything that follows. It gives the junior developer something to measure against, instead of relying entirely on whether the code looks right.
What Senior Developers Are Adding
From the senior side, the role becomes less about filling in missing pieces and more about shaping how those pieces are evaluated.
There’s still guidance on patterns and structure, but more of the interaction is about asking questions that reveal how well something is understood. What is this code assuming? Where could it break down? Does it actually match how the system behaves? Those questions used to come up after the code was written. Now they need to happen alongside it.
None of this is entirely new. Pairing has always been about sharing context and making decisions visible. What has changed is how easy it is for the surface of the code to look correct. The usual signals that something needs attention aren’t as strong, which means more of the responsibility shifts to the interaction between the people in the room.
For a junior developer, that interaction is what turns generated code into something they actually understand. For a senior developer, it’s a reminder that to do right by your pair you need to be paying attention to avoid getting entranced by a seemly-functional solution. Saying “Looks good to me” has never been a more serious dereliction of duty than it is now.
When the code comes easily, understanding it becomes the harder part. That work doesn’t get delegated, and it doesn’t really speed up. It just shows up earlier, closer to the moment where the code first appears.
Pairing is where that work happens.