# Self-review your working diff before committing in Ruby with Atlas in 2026

> Ruby developers in 2026 use Atlas to self-review uncommitted diffs, running RSpec and RuboCop checks to catch mistakes before they impact CI.

Ruby developers in 2026 can self-review their working diffs before committing by leveraging Atlas to read the uncommitted changes, run RSpec tests, and apply RuboCop formatting checks directly within the terminal. This proactive approach ensures that common mistakes are caught early, preventing them from reaching a reviewer or continuous integration pipeline.

## Key takeaways

- Atlas reads full Ruby diffs, not just remembered files, for comprehensive self-review.
- Run `bundle exec rspec` and `bundle exec rubocop` directly via Atlas's `bash` tool.
- Atlas's `grep` tool finds `binding.pry` or `skip: true` in Ruby code.
- Safely revert unwanted Ruby changes using Atlas's snapshot-backed session revert.
- Atlas's TUI and model flexibility optimize Ruby code analysis and interaction.

## How Atlas Reads Ruby Diff Changes for Self-Review

Atlas provides Ruby developers with a powerful method to self-review uncommitted changes by reading the entire working diff, not just files remembered. In 2026, Atlas's VCS layer surfaces the raw diff, allowing a comprehensive review of every modification before it is staged or committed.

Atlas integrates directly with Git to access the working tree, status, and raw diffs. For Ruby projects, this means Atlas can present a unified diff for all changes across your Gemfile, Rakefile, .rb source files, and RSpec test suites. Instead of manually inspecting `git diff` output, Atlas can present this information in its terminal-native TUI, allowing developers to read each changed file in full. This capability is crucial because a standard `git diff` only highlights the lines that have changed, potentially obscuring the impact of those changes on surrounding code that was not directly modified. Atlas's ability to read the full context ensures that a Ruby developer can verify that a change to a method in `app/models/user.rb` does not inadvertently break an unrelated part of the `User` class, even if that part was not touched by the diff itself. This thorough review process is a core component of catching mistakes before they propagate.

## How to Run Ruby Tests and Linters with Atlas Before Committing

Before committing any changes in a Ruby project, Atlas enables developers to run their entire test suite and linter checks directly. In 2026, Atlas exposes `bash` as a tool, allowing execution of `bundle exec rspec` and `bundle exec rubocop` to validate code quality and functionality.

Atlas's integration with `bash` allows Ruby developers to execute their standard toolchain commands within the agent's environment. This means that after making changes to a Ruby file like `lib/my_gem/feature.rb` or a test file in `spec/`, a developer can instruct Atlas to run `bundle exec rspec`. This command will execute all `RSpec` examples, ensuring that new features work as expected and existing functionality remains unbroken. Similarly, to enforce code style and best practices, Atlas can run `bundle exec rubocop`. `RuboCop` will check the entire codebase or specific changed files against the project's `.rubocop.yml` configuration, identifying issues like incorrect indentation, unused variables, or violations of Ruby style guides. By running these critical checks through Atlas, developers receive immediate feedback on their changes, catching errors or style violations that might otherwise be flagged by CI or a human reviewer. This proactive validation step is essential for maintaining high code quality in Ruby projects.

## Finding Debugging Leftovers in Ruby Code with Atlas

Atlas helps Ruby developers eliminate common debugging leftovers like temporary logging or skipped tests before committing. In 2026, Atlas's `grep` tool can efficiently search across the working diff for specific patterns, ensuring that `binding.pry` calls or `skip: true` RSpec tags are removed.

It is common practice for Ruby developers to introduce temporary debugging statements during development, such as `puts` statements, `binding.pry` calls, or `byebug` breakpoints. Similarly, `RSpec` tests might be temporarily skipped using `skip: true` or `xdescribe`. These elements, if committed, can cause issues in production or confuse future developers. Atlas's `grep` tool provides a robust way to scan the entire working diff for these specific patterns. For instance, a developer can instruct Atlas to `grep -E "binding.pry|byebug|puts 'DEBUG'"` across all changed `.rb` files. For `RSpec` tests, a `grep -E "skip: true|xdescribe|xit"` command can quickly identify any temporarily disabled tests in `spec/models/user_spec.rb` or `spec/services/api_client_spec.rb`. By automating this search, Atlas ensures that these debugging artifacts are systematically removed, contributing to cleaner and more stable Ruby codebases. This step is a vital part of a thorough self-review process.

## How Atlas Reverts Unwanted Ruby Changes Safely

If a Ruby developer identifies an unwanted change during self-review, Atlas offers a safe and reliable session revert mechanism. In 2026, Atlas snapshots file changes as Git patches, allowing a developer to restore from a previous state without risking a busy session or losing other work.

During the self-review of a Ruby project, a developer might realize that a particular change, perhaps to `config/initializers/feature_flags.rb` or a new method in `app/controllers/users_controller.rb`, should not be committed. Atlas's session revert feature is designed for this exact scenario. Unlike a manual `git checkout` which can be destructive, Atlas's revert flow is backed by snapshots. Every edit Atlas makes is recoverable, as it creates Git patches of file changes. This means an unwanted modification can be undone precisely, restoring the file to a previous, known good state. A key safety mechanism is that Atlas refuses to run revert on a busy session, preventing a half-written turn from being rolled back mid-flight and ensuring data integrity. This capability provides Ruby developers with confidence to experiment and make changes, knowing that they can easily roll back specific edits if they do not pass self-review, without disrupting their overall development flow.

## Optimizing Ruby Self-Review with Atlas's TUI and Model Flexibility

Atlas enhances the Ruby self-review experience with its terminal-native user interface and flexible model switching. In 2026, developers can leverage Atlas's TUI theme system and switch active AI models on the fly, tailoring the environment for optimal code analysis and interaction.

The terminal-native TUI of Atlas, rendered with SolidJS through the OpenTUI renderer, provides a highly interactive and customizable environment for Ruby developers. When self-reviewing changes in files like `app/services/payment_processor.rb` or `db/migrate/20230101000000_add_column_to_table.rb`, the charcoal-and-blue default theme, along with many presets, can reduce eye strain and improve readability of diffs and command outputs. Beyond aesthetics, Atlas allows developers to switch the active model and provider on the fly, using favorites and recents. This flexibility means a Ruby developer can choose a model optimized for code analysis to help identify subtle issues in complex Ruby logic, or switch to a different model for generating `RSpec` examples or refactoring a module. This adaptability ensures that the AI agent is always best suited for the specific task at hand during the self-review process, from understanding complex `ActiveRecord` queries to suggesting improvements for `RuboCop` violations.

## Steps

1. Produce the working diff with Atlas: Instruct Atlas to read the current Git working tree and surface the unified diff for all uncommitted changes across your Ruby project, including Gemfile, .rb files, and RSpec specs.
2. Review each changed Ruby file in full: Use Atlas's `read` tool to inspect each modified Ruby file completely, checking the changes against their surrounding context in `app/models/user.rb` or `spec/services/api_client_spec.rb`.
3. Grep for debugging leftovers in Ruby code: Employ Atlas's `grep` tool to search for common Ruby debugging artifacts like `binding.pry`, `byebug`, `puts 'DEBUG'`, or `skip: true` in RSpec examples within your changed .rb files.
4. Run Ruby tests with RSpec: Execute your project's RSpec test suite by instructing Atlas to run the `bash` command `bundle exec rspec` to ensure all existing and new functionality works correctly.
5. Run RuboCop for Ruby style and quality: Apply code style and quality checks by having Atlas run the `bash` command `bundle exec rubocop` to identify any violations against your project's `.rubocop.yml` configuration.
6. Revert unwanted Ruby changes: If any change, such as a modification to `config/routes.rb`, is deemed incorrect, use Atlas's session revert feature to restore the file from a snapshot, ensuring the session is not busy.
7. Stage and commit your Ruby changes: Once satisfied with the self-review, instruct Atlas to stage the approved changes and create a new Git commit on your behalf.

## FAQ

### How do I run RSpec tests on my Ruby diff with Atlas?

You can instruct Atlas to use its `bash` tool to execute `bundle exec rspec`. Atlas will run your entire RSpec test suite, providing immediate feedback on your uncommitted Ruby changes.

### Can Atlas check my Ruby code for RuboCop violations before committing?

Yes, Atlas can run RuboCop checks. Use Atlas's `bash` tool to execute `bundle exec rubocop`, which will apply your project's `.rubocop.yml` rules to your Ruby codebase.

### How does Atlas help find debugging code like binding.pry in Ruby?

Atlas's `grep` tool can search your working diff for specific patterns. You can instruct it to `grep -E "binding.pry|byebug|puts 'DEBUG'"` across your Ruby files to catch leftover debugging statements.

### What if I make a mistake and need to undo a change in a Ruby file with Atlas?

Atlas provides a session revert feature, backed by Git patches. If you make an unwanted change to a Ruby file, Atlas can restore it from a previous snapshot, ensuring the session is not busy.

### Does Atlas understand Ruby project structure like Gemfile and Rakefile?

Yes, Atlas is designed to work with Ruby projects. It can read your Gemfile, Rakefile tasks, and modules, building its code index with AST declarations using Tree-sitter.

### Can Atlas help me review changes in specific Ruby files like app/models/user.rb?

Absolutely. Atlas can read its own working tree and surface a unified diff. You can then use Atlas's `read` tool to inspect specific Ruby files like `app/models/user.rb` in full context.

### How does Atlas ensure my Ruby code stays off third-party servers?

Atlas can build its code index with local Ollama embeddings, keeping your Ruby code and its semantic understanding entirely on your machine, off third-party servers.

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Licence: Atlas is proprietary with a free core. It is not open source and there is no public source repository.