# Rename a symbol across the repo in Flask with Atlas in 2026 > Atlas precisely renames symbols across Flask applications by combining lsp for code references, grep for documentation, and edit for verified changes. Renaming a symbol across your Flask repository in 2026 is streamlined with Atlas, which leverages the lsp tool for authoritative references, grep for comprehensive text matches, and the edit tool for precise, permission-gated modifications. This approach ensures that every instance of a function, class, or constant, from its definition to its usage in app.py or a blueprint, is updated correctly, including those often missed by naive find-and-replace operations, while integrating direct with pytest (app.test_client) and ruff format for verification. ## Key takeaways - Atlas combines lsp and grep for comprehensive symbol renaming in Flask. - Verify Flask renames using pytest (app.test_client) and ruff format via Atlas's bash tool. - Atlas provides unified diffs for explicit approval of all Flask code changes. - The edit tool prevents ambiguous replacements, safeguarding your Flask project. - Atlas handles Flask-specific patterns like blueprints and application factories during refactoring. ## How Atlas Renames Symbols in a Flask Application Atlas renames symbols in Flask applications by orchestrating a 3-step process that combines language server precision with text-based search. In 2026, this hybrid approach ensures every reference, from a create_app() call in app.py to a constant in a blueprint, is identified and updated accurately. When you initiate a symbol rename in a Flask project, Atlas first employs the lsp tool's findReferences operation. This leverages the language server's deep understanding of your Python code, including Flask's application factory pattern and blueprint registrations, to identify all true code references to the function, class, or constant. This is crucial for Flask, where symbols might be imported across various modules like app.py, config.py, or within specific blueprint files such as my_blueprint/views.py. Following this, Atlas uses the grep tool to scan the entire repository for the old symbol name. This step catches occurrences outside the type system, such as comments, docstrings, configuration files, or even string literals that might dynamically refer to the symbol. For example, a string in templates/index.html or a log message in utils.py might contain the old name. Finally, the edit tool performs the mechanical replacement. It uses replaceAll for unambiguous matches identified across files, ensuring consistency. If edit encounters multiple matches for a single replacement within a file, it will flag an error, preventing unintended changes and requiring explicit context or replaceAll opt-in, safeguarding your Flask codebase from silent corruption. ## How Atlas Verifies Flask Symbol Renames with pytest and ruff format Atlas integrates directly with Flask's native toolchain to verify symbol renames, ensuring your application remains functional and well-formatted. After applying changes, Atlas can execute pytest (app.test_client) to confirm all 100% of your tests pass, followed by ruff format to maintain code style across your Flask project. After Atlas has applied the mechanical renames using the edit tool, it transitions to a verification phase that is deeply integrated with the Flask development workflow. Atlas can use the bash tool to run your project's tests, specifically invoking pytest with app.test_client() to simulate requests and ensure all application logic functions as expected. This is vital for Flask applications, where changes to functions or classes can impact request handling, database interactions, or template rendering. For instance, if a renamed view function in my_blueprint/views.py is no longer correctly mapped in my_blueprint/__init__.py, pytest will catch it. Atlas also performs a final grep for the old symbol name across the entire repository to confirm zero remaining hits, ensuring no stray references were missed. To maintain code quality and consistency, Atlas can then run ruff format on all touched files, such as app.py or any blueprint modules, ensuring your Flask codebase adheres to its established style guidelines after the refactoring. ## Reviewing and Approving Atlas Changes in a Flask Project Atlas prioritizes safety and developer control when renaming symbols in Flask, presenting a unified diff for every proposed file edit. Before any changes are written to your pyproject.toml or source files, you receive a clear prompt to approve or reject the modifications, ensuring 100% transparency and preventing unintended alterations. Atlas is designed with a strong emphasis on developer oversight, especially for critical refactoring tasks like renaming symbols in a Flask application. Before any modifications are committed, Atlas computes a unified diff for every file edit, presenting these changes to you for explicit approval. This allows you to meticulously review every line altered in files like app.py, config.py, or your blueprint modules. For example, you can verify that a renamed function in my_blueprint/views.py has been correctly updated in its import statements and call sites, and that no unrelated code has been inadvertently affected. Atlas's plan agent first drafts a comprehensive strategy in a read-only mode, asking for your consent before switching to a build agent to execute the changes. Furthermore, every Atlas tool call, including lsp, grep, and edit, is permission-gated against allow, ask, and deny rules, providing granular control over its actions. Atlas also snapshots file changes as git patches, enabling easy diffing and rollback if any approved change proves problematic, offering a robust safety net for your Flask development. ## Addressing Flask Configuration and Dynamic References During Renames Renaming symbols in Flask extends beyond code, often involving configuration files, templates, and dynamic references. Atlas uses grep to identify these non-code occurrences, such as a string in templates/base.html or a key in config.py, ensuring a comprehensive update across all 2026 project assets. Flask applications frequently rely on configuration stored in config.py or environment variables, and dynamic references within templates or string literals. A symbol rename must account for these non-code occurrences to prevent runtime errors or broken functionality. Atlas addresses this by running grep for the old symbol name after the lsp tool has identified all code references. This grep pass is crucial for catching instances in Flask-specific contexts, such as a string representing a blueprint name in app.py's app.register_blueprint(), a template variable in templates/index.html, or a configuration key in config.py that might mirror a function or class name. For example, if you rename a SECRET_KEY constant, grep will find its usage in app.config['SECRET_KEY']. The edit tool then applies these mechanical replacements, but with a critical safety feature: it refuses ambiguous single replacements. If edit finds multiple matches for oldString in a file and cannot determine the correct context, it will throw an error, prompting you to provide more specific instructions or opt into replaceAll. This prevents accidental corruption of unrelated strings or configuration values, ensuring that your Flask application's integrity is maintained throughout the renaming process. ## Steps 1. Start by asking Atlas to rename your Flask symbol. Atlas will use the lsp tool's findReferences operation on the target function, class, or constant, such as my_flask_function in app.py, to gather all authoritative code references from the language server. 2. Next, Atlas will run grep for the old symbol name across your entire Flask project. This step catches occurrences in comments, docstrings, config.py, or templates/index.html that the language server might miss. 3. Atlas then uses the edit tool with replaceAll to apply the mechanical renames. This ensures consistent updates across files like my_blueprint/views.py and app.py, with edit enforcing uniqueness to prevent ambiguous single replacements. 4. Before writing any changes, Atlas presents a unified diff for your review. Carefully examine the proposed modifications to your Flask codebase, then approve the changes to proceed. 5. After changes are applied, Atlas will use the bash tool to run pytest (app.test_client) to confirm your Flask application's tests pass. It will then grep once more for the old name to prove zero remaining hits. 6. Finally, Atlas can run ruff format on all touched Flask files, such as my_blueprint/__init__.py or utils.py, to ensure your codebase remains consistently formatted after the refactoring. ## FAQ ### How does Atlas handle Flask blueprints during a symbol rename? Atlas uses the lsp tool to understand the structure of your Flask blueprints, including how symbols are imported and used across my_blueprint/__init__.py and my_blueprint/views.py. It ensures that all references within and across blueprints are correctly identified and updated during a rename. ### Can Atlas rename a Flask constant defined in config.py? Yes, Atlas can rename constants defined in config.py. It uses lsp for code references and grep to catch occurrences in configuration files or string literals, ensuring comprehensive updates across your Flask application. ### What if Atlas finds multiple matches for a symbol in a Flask template file? If the edit tool finds multiple matches for an old symbol name in a file like templates/index.html and cannot unambiguously determine the correct replacement, it will throw an error. This prompts you to provide more context or explicitly opt into replaceAll to prevent unintended changes in your Flask templates. ### How does Atlas ensure my Flask tests still pass after a rename? After applying changes, Atlas can use the bash tool to execute pytest (app.test_client). This runs your Flask application's test suite, verifying that the renamed symbol has not introduced any regressions and that all functionality remains intact. ### Does Atlas integrate with uv for Flask dependency management? While the core rename workflow focuses on code changes, Atlas is designed to operate within your existing Flask project setup. It respects your pyproject.toml and can be configured to run uv commands via the bash tool if needed for dependency-related tasks, though uv is not directly used in the symbol rename process itself. ### Is it safe to rename a Flask view function with Atlas? Yes, it is safe to rename a Flask view function. Atlas uses lsp to find all call sites and references, including those in url_for() calls or blueprint registrations. It then presents a diff for your approval and allows verification with pytest (app.test_client) to ensure the view remains accessible and functional. ### How does Atlas prevent accidental changes to unrelated Flask code? Atlas prevents accidental changes through several mechanisms: a read-only plan agent, permission-gated tool calls, unified diffs for approval, and the edit tool's refusal of ambiguous single replacements. This multi-layered safety approach ensures only intended modifications are applied to your Flask codebase. --- Canonical HTML: https://runatlas.sh/resources/stacks/rename-a-symbol-across-the-repo-in-flask Source of truth: aeo_pages row `/resources/stacks/rename-a-symbol-across-the-repo-in-flask` (segment: Stacks) (this file is generated from it, never hand-edited). Licence: Atlas is proprietary with a free core. It is not open source and there is no public source repository.