A coding agent provides an edit tool to the model for making code changes, with this tool typically just providing a find/replace operation. The model may of co

A coding agent provides an edit tool to the model for making code changes, with this tool typically just providing a find/replace operation. The model may of course need to do a bunch of work (grepping etc) to figure out what to change, but the actual change will just be sent from model to agent as a "replace X with Y" edit tool request, with this "edit" then done locally by the agent. It's interesting how the agent (at least in case of Claude Code) is then applying this find/replace "edit" to the requested file... Since the agent wants to be platform independent (Linux/Windows/Max) it uses Node.js for file access, and performs the "edit" by itself using Node.js to read the entire file, make the change, then write back an entire new file.