A DeepSeek Harness user wants to change the tool's behaviour without editing the host program's source, so loads a custom agent preset by double-clicking a file.
Users patch DeepSeek Harness source directly or hand-maintain config files and re-apply patches after upgrades; the candidate material provides no user-stated alternative.
Public material only says installation is zero-intrusion and survives upgrades; there are no user-stated complaints about upgrades overwriting configuration or the maintenance cost of patching source.