edit

To safely replace a unique string in a configuration file, you provide a target file path, the exact old string, and the new string. The tool validates that the target string appears exactly once before writing the modified content back to disk.

If the target string appears multiple times, the edit operation fails. The safety validation mechanism requires the target old string to appear exactly once to prevent accidental edits to unintended duplicates across source files.

Your string replacement fails because the safety validation requires the exact old string to appear exactly once. If the target string is missing or duplicated in the source file, the operation will not write the modified content to disk.

Yes, you can update a single placeholder by providing the exact old string and new string. The uniqueness validation ensures the placeholder occurs exactly once, preventing modifications to any duplicate occurrences in the file.

To patch one specific line across source files, you need a file path plus the old_str and new_str inputs. The tool performs uniqueness validation on the old_str before applying the replacement and persisting the change back to disk.