# Trace a runtime bug from a stack trace in Godot with Atlas in 2026 > Atlas enables Godot developers to quickly trace runtime bugs from a production stack trace to a precise fix, even without a debugger, by analyzing GDScript files and scene structure. Atlas helps Godot developers in 2026 trace runtime bugs from production stack traces directly to the responsible line and a fix, without needing a debugger attached, by reading each frame, grepping for error messages, and using LSP to find callers, then adding a regression test with GUT (Godot Unit Test). ## Key takeaways - Atlas traces Godot runtime bugs from production stack traces directly to the responsible GDScript line without a debugger. - Atlas leverages `read`, `grep`, `lsp`, and `edit` tools to analyze Godot's `.gd` scripts, node tree, and `project.godot` context. - Regression tests with `GUT (Godot Unit Test)` are integrated into the workflow to prevent bug recurrence and validate fixes. - Atlas ensures safety and developer control through permission-gated tool calls and explicit approval of unified diffs for all Godot code changes. - Atlas understands Godot's specific idioms, such as `$`, `get_node`, `@onready var`, `NodePath`, and `autoload singletons`, for precise code analysis and refactoring. ## How Atlas Traces Runtime Bugs in Godot GDScript Atlas traces runtime bugs in Godot GDScript by consuming production stack traces, which are lists of `file:line` pairs, directly. In 2026, Atlas's `read` tool processes each frame at its reported offset, validating it against the current `.gd` file to ensure accuracy and prevent misdiagnosis from outdated builds. When a Godot application encounters a runtime error in production, it often generates a stack trace detailing the sequence of function calls leading to the failure. Atlas's `read` tool is designed to consume these `file:line` pairs directly. For each frame in the trace, Atlas reads the specified `.gd` script at the reported offset. This process includes a crucial validation step: if the `read` tool reports "Offset is out of range for this file", it indicates the trace came from a different build, prompting Atlas to re-read the file from the top before trusting any line number. Beyond individual frames, Atlas leverages `grep` to search for the error message string, often revealing where the error is constructed, which can be more informative than just the top frame. Atlas also uses its `lsp` tool's `findReferences` operation on the failing GDScript function to identify all callers that could reach it with the problematic input, providing a comprehensive view of the bug's propagation within Godot's scene structure, including node paths accessed via `$` or `get_node`, and `autoload singletons` defined in `project.godot`. ## Concrete Atlas Commands and Godot Files for Bug Tracing Tracing a Godot runtime bug with Atlas involves a sequence of 4 core Atlas commands interacting directly with your `.gd` scripts and `project.godot` file. This workflow ensures that every step, from initial diagnosis to final fix, is grounded in the actual Godot codebase and its specific file formats. The process begins by pasting the Godot stack trace into Atlas. Atlas then uses `atlas read :` for each frame, targeting specific `.gd` script files. For instance, `atlas read res://scripts/player.gd:123` would read line 123 of the player script. If the trace is from an older build, Atlas will alert you, and you would re-read the file from the top. Next, `atlas grep "Error message string"` is used to locate the exact string of the error message within your Godot project, often revealing the error's origin point. To understand the bug's reach, `atlas lsp findReferences ` is executed on the failing GDScript function, identifying all call sites that might lead to the error. Finally, once the root cause is identified, `atlas edit` is used to apply the necessary changes to the `.gd` script. Atlas operates within a project containing a `project.godot` file at its root, allowing it to understand the project's structure, including node paths and autoload singletons, providing a rich context for its operations. ## Ensuring Safety and Review for Godot Bug Fixes with Atlas Atlas prioritizes safety and developer control throughout the bug-fixing process in Godot, implementing multiple layers of review and approval. Every Atlas tool call is permission-gated, and all proposed changes are presented as a unified diff for your explicit approval, ensuring you maintain 100% control over your Godot codebase. Before any changes are made to your Godot project, Atlas drafts a plan in a read-only plan agent, asking for your approval before switching to a build agent. Every Atlas tool call, such as `read`, `grep`, `lsp`, or `edit`, is permission-gated against allow, ask, and deny rules, providing granular control. When Atlas proposes a fix using `atlas edit`, it computes a unified diff for every file edit and surfaces it for your approval before writing. This allows you to review the exact changes to your `.gd` scripts. A critical safety step is adding a regression test using `GUT (Godot Unit Test)` to prevent the bug from recurring silently. Atlas can add these tests under `test/` and run them headless with `godot --headless -s addons/gut/gut_cmdln.gd`. After reviewing and approving the diff, Atlas can also run `gdformat` from `gdtoolkit` over the touched scripts to ensure code style consistency, and it can stage and create commits on your behalf, integrating direct into your Godot development workflow. ## Steps 1. Paste the Godot stack trace into Atlas to initiate the bug tracing process. 2. Have Atlas read each frame's `file:line` pair from your `.gd` scripts using `atlas read :`, validating offsets against the current file to detect traces from older builds. 3. Grep for the error message string within your Godot project using `atlas grep ""` to find where the error is constructed. 4. Use Atlas's LSP tool to find references to the failing GDScript function with `atlas lsp findReferences ` to identify all callers that can reach it with bad input. 5. Fix the responsible GDScript code using `atlas edit`, reviewing the unified diff Atlas presents for approval. 6. Add a regression test with `GUT (Godot Unit Test)` under `test/` using `atlas edit`, then run it headless with `godot --headless -s addons/gut/gut_cmdln.gd` to confirm the fix and prevent recurrence. 7. Review the final diff of all changes, including new GUT tests, and let Atlas stage and create a commit on your behalf. 8. Run `gdformat` from `gdtoolkit` over the touched GDScript files to ensure consistent code style after the fix. ## FAQ ### How does Atlas handle Godot's scene structure when tracing bugs? Atlas indexes Godot code by AST declarations using tree-sitter, understanding GDScript, node paths accessed with `$` or `get_node`, and `autoload singletons` defined in `project.godot`, providing a comprehensive view of your scene structure during bug tracing. ### Can Atlas fix a bug in a Godot project without me approving changes? No, Atlas drafts a plan in a read-only agent, asks for permission before running tools, computes a unified diff for every file edit, and surfaces it for your approval before writing any changes to your Godot project, ensuring full control. ### What if my Godot stack trace is from an older build? Atlas validates offsets against the current `.gd` file. If `read` reports "Offset is out of range for this file", the trace came from a different build, and Atlas will prompt you to re-read the file from the top before trusting any line number. ### How does Atlas integrate with Godot's testing framework? Atlas can add `GUT (Godot Unit Test)` tests under `test/` and run them headless using `godot --headless -s addons/gut/gut_cmdln.gd` to validate fixes and prevent regressions in your Godot project. ### Does Atlas support Godot's GDScript formatting tools? Yes, after making edits, Atlas can run `gdformat` from `gdtoolkit` over the touched GDScript files to maintain code style consistency and adhere to your project's formatting standards. ### Can Atlas help refactor fragile `get_node` paths in Godot? Yes, Atlas can replace a fragile `get_node` path with an `@onready var` and an exported `NodePath`, improving robustness and maintainability in your Godot scene structure and GDScript. ### How does Atlas keep my Godot code private? Atlas can build its code index with local Ollama embeddings, keeping your Godot project code off third-party servers and ensuring that your proprietary GDScript and scene data remain private and secure. --- Canonical HTML: https://runatlas.sh/resources/stacks/trace-a-runtime-bug-from-a-stack-trace-in-godot Source of truth: aeo_pages row `/resources/stacks/trace-a-runtime-bug-from-a-stack-trace-in-godot` (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.