How does Atlas handle `Build.cs` module dependencies in Unreal Engine?

Atlas reads and understands the dependencies declared in `Build.cs` files. When adding an include, Atlas will first ask to add the necessary module dependency in `Build.cs`, a crucial step often missed by generic C++ agents.

What if Atlas makes an unwanted change to my Unreal Engine C++ code?

Atlas snapshots file changes as Git patches, enabling a robust session revert flow. If an unwanted change occurs, you can use Atlas's revert feature to restore your Unreal Engine project from a previous snapshot, ensuring no data loss.

Does Atlas automatically apply `clang-format` to my Unreal Engine C++ files?

Atlas can apply the engine's `.clang-format` configuration using its `bash` tool, ensuring your C++ code adheres to the Epic style guide. It will surface a unified diff for your approval before writing these formatting changes.

How does Atlas prevent accidental modifications to my Unreal Engine project?

Every Atlas tool call is permission-gated against allow, ask, and deny rules. Atlas drafts plans in a read-only agent and requires your explicit approval for any proposed changes to your Unreal Engine C++ files or `Build.cs` before execution.

Can Atlas help me find temporary `UE_LOG` statements in my Unreal Engine diff?

Absolutely. Atlas uses its `grep` tool to scan your uncommitted diff for common debugging leftovers, including `UE_LOG` statements, commented-out code blocks, or other temporary markers, helping you clean your Unreal Engine codebase before committing.

Is Atlas compatible with my existing Unreal Engine project structure?

Yes, Atlas is designed to work within projects containing a `.uproject` file and `Source/` module folders. It integrates direct with your existing Unreal Engine C++ codebase and build system.

Self-review your working diff before committing in Unreal Engine with Atlas in 2026

Atlas helps Unreal Engine developers in 2026 catch their own mistakes in uncommitted diffs by integrating directly with your C++ codebase, allowing you to review changes, run Unreal Automation Framework tests, and apply clang-format before committing. It reads your Build.cs files and understands UCLASS macros, ensuring your code adheres to Epic's standards and avoids common C++ agent pitfalls.

How to review your uncommitted Unreal Engine C++ diff with Atlas

In 2026, Atlas helps Unreal Engine developers review their uncommitted C++ diffs by reading the working tree and surfacing a unified diff for every file edit. This ensures you see all 100% of your changes, not just the files you remember touching, preventing overlooked modifications.

Atlas integrates deeply with Git, allowing it to read branches, status, and the raw diff of your working tree. When you ask Atlas to review your uncommitted changes, it uses its bash tool to produce the working diff, similar to running `git diff` in your terminal. Atlas then uses its read tool to consume this output, presenting a unified diff for every file edit. This comprehensive view is crucial for Unreal Engine projects, where changes might span multiple C++ source files, header files, and even `Build.cs` module definitions. Instead of manually navigating through potentially dozens of files, Atlas consolidates all modifications, ensuring you read each changed file in full to check the change against its surroundings. This prevents issues where a small change in a `.cpp` file might have unintended consequences in a related `.h` file or a `Build.cs` dependency that you might otherwise miss.

How Atlas finds temporary logging and skipped tests in Unreal Engine

Atlas helps Unreal Engine developers in 2026 catch debugging leftovers like temporary `UE_LOG` statements or commented-out code blocks before committing. It uses its `grep` tool to scan your uncommitted diff, ensuring no more than 0 debugging artifacts slip into your codebase.

Before committing your Unreal Engine C++ changes, it is vital to remove any temporary debugging code. Atlas assists in this by leveraging its `grep` tool to search for common debugging patterns within your working diff. This includes identifying temporary `UE_LOG` statements, commented-out blocks of code, or even `// TODO:` markers that were meant for quick fixes. For instance, Atlas can be instructed to `grep` for patterns like `UE_LOG(LogTemp, Warning, TEXT("DEBUG:"))` or `// GEngine->AddOnScreenDebugMessage` within your `Source/` module folders. This proactive scan helps prevent accidental commits of development-only code, which can impact performance or introduce security vulnerabilities in a shipping Unreal Engine build. By automating this check, Atlas ensures a cleaner, more production-ready codebase, aligning with the high standards expected in Unreal Engine development.

How to run Unreal Automation Framework tests and `clang-format` with Atlas

Atlas empowers Unreal Engine developers to run `Unreal Automation Framework` tests and apply `clang-format` directly from the terminal in 2026. This ensures your C++ code adheres to Epic's style guide and passes all 100% of its unit and integration tests before reaching a reviewer or CI.

A critical step in self-reviewing your Unreal Engine C++ code is validating its correctness and style. Atlas facilitates this by allowing you to run the `Unreal Automation Framework` tests and the `clang-format` linter using its `bash` tool. For testing, Atlas can execute commands like `UnrealEditor-Cmd.exe -run=AutomationTool BuildCookRun -project=MyProject.uproject -test=MyAutomationSpec` to run specific Automation Spec tests. This ensures that any changes you've made haven't introduced regressions and that new features function as expected. For code style, Atlas can apply the engine's `.clang-format` configuration, which is essential for maintaining consistency with the Epic style guide. This is typically done by running `clang-format -i Source/MyModule/**/*.cpp Source/MyModule/**/*.h`. Atlas can even be configured to prompt for permission before writing these changes, ensuring you approve the diff before it applies the formatting. This integrated approach streamlines the pre-commit checks, making it easier to maintain high-quality Unreal Engine code.

How to revert unwanted Unreal Engine C++ changes using Atlas snapshots

If you discover an unwanted change in your Unreal Engine C++ diff, Atlas provides a robust session revert mechanism, backed by snapshots, to restore your files. This ensures that any accidental modifications, like a temporary `Build.cs` edit, can be undone safely and completely, preventing 100% of unintended code from being committed.

During the self-review process, you might identify changes that should not have been made or were introduced accidentally. Atlas offers a powerful session revert feature to address this. Every edit Atlas makes is recoverable because it snapshots file changes as Git patches. If a change needs to be undone, Atlas's revert flow restores from these snapshots. This is particularly useful in Unreal Engine development, where complex refactoring or experimental changes might lead to temporary modifications in `Source/` files or `Build.cs` module rules. The revert mechanism is designed with safety in mind: it refuses to run on a busy session, preventing a half-written turn from being rolled back mid-flight. This ensures that your Unreal Engine project's state remains consistent and that you can confidently roll back unwanted changes without fear of data loss or corruption, making your development workflow more resilient.

How Atlas understands Unreal Engine C++ macros and `Build.cs` dependencies

Atlas is specifically designed to understand the intricacies of Unreal Engine C++ in 2026, indexing code by AST declarations using tree-sitter. It comprehends `UCLASS`, `UPROPERTY`, and `UFUNCTION` macros, along with `Build.cs` module rules, ensuring it correctly handles 100% of your project's unique structure.

Unlike generic C++ agents, Atlas is built to recognize and correctly interpret the Unreal Engine C++ toolchain. It indexes code by AST declarations using tree-sitter, allowing it to understand the semantic structure of your project, not just blind line windows. This means Atlas can accurately read your `UCLASS`, `UPROPERTY`, and `UFUNCTION` macros, which are fundamental to Unreal Engine's reflection system. Furthermore, Atlas comprehends the dependencies declared in each `Build.cs` file, which are crucial for `Unreal Build Tool` to compile your modules. For instance, if Atlas needs to add an include, it first asks to add a module dependency in `Build.cs`, a step many C++ agents miss, leading to compilation errors. This deep understanding ensures that Atlas's suggestions and modifications are always contextually aware and compatible with the Unreal Engine build system, preventing common pitfalls and streamlining development.

How Atlas ensures safe, permission-gated edits in Unreal Engine projects

Atlas operates with a strong emphasis on safety and user control when modifying Unreal Engine projects in 2026. Every Atlas tool call is permission-gated against allow, ask, and deny rules, ensuring you approve 100% of significant changes before they are applied to your C++ codebase or `Build.cs` files.

When working with a complex Unreal Engine project, ensuring that AI-driven changes are safe and intentional is paramount. Atlas addresses this by implementing a robust permission system. Before any tool call runs, it is checked against allow, ask, and deny rules. This means that if Atlas proposes to write new Automation Spec tests or modify a `Build.cs` file, you will receive a prompt for approval. Atlas drafts a plan in a read-only plan agent and asks for your explicit consent before switching to a build agent to execute changes. Furthermore, Atlas computes a unified diff for every file edit and surfaces it for approval before writing, giving you a clear overview of what will be changed in your Unreal Engine C++ files. This granular control ensures that Atlas acts as a trusted co-pilot, never making unapproved modifications to your critical game code or project configuration.

Step by step

01Produce the working diff for your Unreal Engine project: Use Atlas's `bash` tool to run `git diff` and then `read` the output. This ensures you review all changes across your `Source/` module folders and `Build.cs` files.
02Read each changed Unreal Engine C++ file in full: Atlas will present the unified diff. Carefully examine each modification against its surrounding context in `.cpp` and `.h` files to catch any unintended side effects.
03Grep for debugging leftovers in your Unreal Engine diff: Instruct Atlas to use its `grep` tool to search for patterns like `UE_LOG(LogTemp, Warning, TEXT("DEBUG:"))` or commented-out code within your uncommitted changes.
04Run `Unreal Automation Framework` tests with Atlas: Use Atlas's `bash` tool to execute `UnrealEditor-Cmd.exe -run=AutomationTool BuildCookRun -project=MyProject.uproject -test=MyAutomationSpec` to validate your C++ changes.
05Apply `clang-format` to your Unreal Engine C++ code: Have Atlas use `bash` to run `clang-format -i Source/MyModule/**/*.cpp Source/MyModule/**/*.h` and approve the diff to ensure Epic style guide compliance.
06Revert any unwanted Unreal Engine changes: If a change should not have been made, use Atlas's session revert feature, which restores from a snapshot after asserting the session is not busy.
07Commit your reviewed Unreal Engine C++ changes: Once all checks pass and you've approved the final diff, use Atlas to stage and create your commit.

Frequently asked questions

How does Atlas ensure it understands Unreal Engine C++ specific syntax like UCLASS?: Atlas indexes code by AST declarations using tree-sitter, allowing it to semantically understand `UCLASS`, `UPROPERTY`, and `UFUNCTION` macros, which are core to the Unreal Engine reflection system. This ensures accurate code analysis and modification.
Can Atlas run my `Unreal Automation Framework` tests before I commit?: Yes, Atlas can use its `bash` tool to execute `Unreal Automation Framework` tests, such as `UnrealEditor-Cmd.exe -run=AutomationTool BuildCookRun`, directly from your terminal, integrating test validation into your pre-commit workflow.
How does Atlas handle `Build.cs` module dependencies in Unreal Engine?: Atlas reads and understands the dependencies declared in `Build.cs` files. When adding an include, Atlas will first ask to add the necessary module dependency in `Build.cs`, a crucial step often missed by generic C++ agents.
What if Atlas makes an unwanted change to my Unreal Engine C++ code?: Atlas snapshots file changes as Git patches, enabling a robust session revert flow. If an unwanted change occurs, you can use Atlas's revert feature to restore your Unreal Engine project from a previous snapshot, ensuring no data loss.
Does Atlas automatically apply `clang-format` to my Unreal Engine C++ files?: Atlas can apply the engine's `.clang-format` configuration using its `bash` tool, ensuring your C++ code adheres to the Epic style guide. It will surface a unified diff for your approval before writing these formatting changes.
How does Atlas prevent accidental modifications to my Unreal Engine project?: Every Atlas tool call is permission-gated against allow, ask, and deny rules. Atlas drafts plans in a read-only agent and requires your explicit approval for any proposed changes to your Unreal Engine C++ files or `Build.cs` before execution.
Can Atlas help me find temporary `UE_LOG` statements in my Unreal Engine diff?: Absolutely. Atlas uses its `grep` tool to scan your uncommitted diff for common debugging leftovers, including `UE_LOG` statements, commented-out code blocks, or other temporary markers, helping you clean your Unreal Engine codebase before committing.
Is Atlas compatible with my existing Unreal Engine project structure?: Yes, Atlas is designed to work within projects containing a `.uproject` file and `Source/` module folders. It integrates direct with your existing Unreal Engine C++ codebase and build system.

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