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The skills -> command toggle cleanup in register_enabled_extensions_for_agent() recomputed the remaining tracked registered_skills names by checking only the toggling agent's own skills directory. Since registered_skills is a single flat list shared across every agent an extension has ever been activated under (skills are only ever rendered for the active agent, so there is no per-agent registry key), a name whose mirror still existed under a *different*, previously-active agent's directory was incorrectly dropped from tracking as soon as the current agent's own copy was removed. A later full removal only iterates registered_skills, so the orphaned mirror under the other agent's directory was never found or cleaned up. Add _extension_owned_skill_names(), which re-verifies ownership across every configured agent's skills directory (deduped by shared path) the same way the existing _unregister_extension_skills() fallback scan already does, keeping a name only when a SKILL.md with a matching metadata.source == "extension:<id>" marker is found somewhere - read-only, no directory creation, no symlink escape. Use it instead of re-checking only the toggling agent's own directory when recomputing what remains tracked after narrow stale-mirror cleanup. Add a red-first regression test: Auggie is activated in skills mode first (writing a mirror), then Copilot is activated in skills mode (writing its own mirror for the same names), then Copilot toggles to command mode. Before the fix, registered_skills lost both names entirely even though Auggie's mirrors were untouched on disk; after the fix tracking is preserved and a subsequent full removal correctly cleans up Auggie's remaining mirrors too. Assisted-by: GitHub Copilot (model: Claude Sonnet 5, autonomous) Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>