Audience
Software developers building AI coding agents or developer tools wanting a reliable system to merge AI-generated code edits into existing codebases
About Morph Fast Apply
Morph FastApply is a specialized AI infrastructure tool designed to dramatically improve how AI coding agents edit and update source code. Instead of rewriting entire files or relying on fragile search-and-replace operations, FastApply merges AI-generated code changes directly into existing files using a semantic understanding of the code structure. It works by allowing an AI model to output only the relevant modifications to a file while marking unchanged sections with placeholders. The FastApply model then merges those changes server-side, reconstructing the complete updated file while preserving formatting, syntax, comments, and dependencies. This approach significantly reduces the number of tokens required and eliminates many of the errors caused by traditional diff-based or search-and-replace editing methods. It processes edits at speeds of over 10,500 tokens per second with approximately 98% accuracy.