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Firebender takes advantage of built-in LSP refactoring actions. This lets it edit typed languages like Kotlin/Java much faster and safer.

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Rename Symbol

Here, the AI made 56 edits across 18 files in a few seconds. This would take ~215x longer if AI had to make each change with search-replace. Uses IntelliJ’s rename refactoring. Updates getters/setters, test names, imports, and type annotations. Warns on naming conflicts.

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Delete Symbol

Remove unused code. Checks for usages first, blocks deletion if symbol is still referenced. Optional force mode for intentional breaking changes. In this example, the AI deletes a 318-line function in < 1 second.