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_extension_owned_skill_names() and the fast/fallback paths of its sibling _unregister_extension_skills() called skills_candidate.resolve() and then checked children relative to that already-resolved candidate. If the candidate directory itself (e.g. .gemini/skills) was a symlink pointing outside the project root, both the resolve() call and the subsequent containment check silently passed through the symlink instead of rejecting it: - _extension_owned_skill_names() would falsely attribute ownership to a marker-matching SKILL.md living outside the project. - _unregister_extension_skills()'s fast path (an explicit skills_dir, as passed by the toggle-cleanup call site) and its fallback scan (used during full extension removal) would both shutil.rmtree() the external directory, deleting unrelated content outside the project. Fix by validating the candidate directory itself with the existing _validate_safe_shared_directory() shared-infra helper before any probe or delete: it rejects a symlink at any path component (walking down from the project root, including the final component) without ever resolving through it, and is already used elsewhere in the codebase for the same class of shared-directory containment check. Unsafe candidates are skipped/refused rather than followed. Add red-first security regression tests reproducing each of the three call sites with a `.gemini/skills` symlink pointing at an external directory containing a marker-matching SKILL.md and an unrelated precious_file.txt: provenance inference must not attribute the name, and both the explicit-skills_dir fast path and the None-skills_dir fallback scan must leave the external directory and file untouched. Existing valid shared/deduped directory tests (e.g. agy/amp/codex/zed sharing .agents/skills) continue to pass, confirming legitimate shared directories still clean up correctly. Assisted-by: GitHub Copilot (model: Claude Sonnet 5, autonomous) Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>