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How to Use Coding Agents and Still Understand Each Change

I use coding agents by setting expectations first, delegating bounded work, reviewing and testing the diff, and explaining the change back to myself.
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I use coding agents without handing them the whole problem: I write down what I expect to change, delegate a bounded task, inspect and test the diff, and explain the result back to myself. That routine is my practical self-check, not a proven formula. The evidence suggests AI can help people finish work while leaving learning as a separate question.

Why finishing a task is not the same as understanding it

A working change proves that the code ran under the conditions you tried. It does not, by itself, prove that you can explain the change, predict its edge cases, or debug it when those conditions differ.

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That distinction matters in the available evidence. In a randomized trial described by Anthropic on January 29, 2026, 52 mostly junior software engineers unfamiliar with the Python library Trio completed coding tasks with or without AI. The AI group averaged 50% on an immediate comprehension quiz, compared with 67% for the hand-coding group; Anthropic reported Cohen’s d = 0.738 and p = 0.01. The AI group finished about two minutes faster on average, but the time difference was not statistically significant. The quiz covered debugging, code reading, code writing, and conceptual understanding. Anthropic’s study measured comprehension shortly after the task, not durable skill, and its setup was not a direct evaluation of modern agentic coding products such as Claude Code.

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That result should not be stretched into a claim that all AI use harms learning. The experiment involved a particular group, library, task, and immediate quiz. It does show why I treat task completion and understanding as two separate outcomes to check.

How I use a coding agent without losing the thread

This is the workflow I use as a practical discipline, not a research-validated protocol. Its purpose is to keep my own model of the system active while the agent contributes implementation work.

1. Write down my expectation before delegating

Before asking for a change, I state the goal, the constraints, the relevant architecture, and what I think will need to change. For example: “Add a retry for this request, but preserve the current timeout and error behavior; I expect the change to be limited to the client and its tests.” The expectation gives me something concrete to compare with the result. If I cannot name the affected behavior or likely code path, I first inspect the project enough to form a hypothesis.

2. Keep the request bounded

I ask for one coherent change rather than an open-ended instruction to improve a subsystem. A bounded request makes the resulting diff easier to review and gives me a clearer way to notice when the agent has crossed an assumption or architectural boundary. I include constraints that matter, such as compatibility requirements, existing conventions, or behavior that must remain unchanged.

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3. Ask for an explanation, then question it

After implementation, I ask the agent to summarize the changed behavior, assumptions, and edge cases. I use that explanation to identify what to verify, not as proof that the code is correct. I follow up with conceptual questions: which path runs when the input is empty, where an error is handled, or what state can change between these calls?

Anthropic’s qualitative analysis found that conceptual questions, requests for explanations, and follow-up questions aimed at understanding appeared in interaction patterns associated with stronger quiz performance. The authors explicitly say those observations do not establish that the patterns caused the better scores. A separate Google Research study of a code-understanding IDE plugin found that, among 32 participants, it aided task completion more than web search. An explanation can be useful, but it can still be wrong or incomplete; I verify it against the code.

4. Read the diff and trace the behavior

I inspect what changed, then follow the relevant path through the surrounding code: where data enters, which conditions branch, what is returned or persisted, and how failures propagate. I also look for changes outside the expected scope. A passing test or successful run is evidence about the cases exercised, not a substitute for understanding the implementation.

Microsoft Research’s qualitative study of more than eight hours of curated vibe-coding session video described an iterative cycle of prompting, scanning generated code, testing the application, and editing manually when needed. The authors’ account emphasizes that programming expertise remains relevant as the work shifts toward managing context, evaluating code, and deciding when to take over manually. The study summary describes observed sessions, not a controlled test of a method for preserving mental models.

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5. Test a behavior and debug the failure myself

I run the relevant tests or a small behavioral check tied to the requirement. If something fails, I first try to explain the failure from the code and observed behavior, then use the agent as a second perspective. That keeps debugging judgment from becoming “ask the agent until the tests are green.” Debugging was part of the immediate quiz in Anthropic’s experiment, where the reported score gap was especially notable, but that finding comes from its limited learning setup.

6. Close with a short explanation in my own words

Before moving on, I summarize what changed, why it works, what I tested, and what remains uncertain. If I cannot explain the behavior without repeating the agent’s wording, I have a signal to inspect the code or ask another question. This is a self-check, not a measured score or guarantee of long-term retention.

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Choose the amount of delegation based on the task

I do not use the same level of delegation for familiar execution and for learning a new API. The useful distinction is what success means in that moment: output, immediate comprehension, or building a skill I will need again.

Situation How I delegate What I check
Familiar, well-scoped change Delegate a bounded implementation, with explicit constraints and expected scope. Whether the diff matches the intended behavior, respects conventions, and passes relevant checks.
Unfamiliar library or concept Ask conceptual questions and request explanations; keep more of the implementation or exploration in my own hands. Whether I can explain the API’s behavior and reason through cases beyond the example that worked.
High-impact or hard-to-reverse change Use the agent for suggestions or a small part of the work rather than handing over the full design and implementation. Assumptions, boundaries, failure paths, and behavior that tests may not cover.

These are judgment calls, not experimentally established rules. Anthropic’s trial concerned learning an unfamiliar library, Microsoft’s vibe-coding work observed conversational coding sessions, and its productivity experiments assessed code-completion tools. Those different settings do not identify one delegation level that preserves understanding in every project.

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What productivity studies do—and do not—tell me

AI can increase output on some tasks without showing that developers understand or retain the code they produce. Microsoft Research’s June 2025 summary of three randomized field experiments at Microsoft, Accenture, and an anonymous Fortune 100 company reported a 26.08% increase in completed tasks (SE 10.3%) among 4,867 developers using an AI code-completion tool. Those experiments measured workplace task completion with code-completion suggestions; they do not establish comprehension, lasting learning, or the effects of an agentic workflow.

So I treat speed and understanding as separate checks. I can use assistance to move faster on familiar work while choosing a more hands-on approach when the goal is to learn. Neither a completed task nor an explanation is enough on its own: I still need to inspect, test, and make sense of the change.

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