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The Box backends behave inconsistently when extra_mounts reference a missing host directory (nsjail aborts the entire sandbox start, Docker silently creates a root-owned empty dir on the host, E2B silently skips the upload). The cache in skill_mgr.skills is only refreshed on in-process mutations, so out-of-band changes — container rebuilds, manual rm in the box volume, anything the LangBot API didn't drive — leave a stale skill that later produces one of those bad mount paths. - box/service.py: build_skill_extra_mounts now filters skills whose package_root is not isdir on the LangBot-visible filesystem and logs a warning, instead of passing the bad mount through to the backend - skill/manager.py: reload_skills (Box path) drops skills whose package_root is missing on the LangBot-side filesystem before they reach the in-memory cache, with a summary warning - api/http/controller/groups/skills.py: file/CRUD handlers now also catch BoxError (RuntimeError subclass, previously slipping past ``except ValueError`` and surfacing as 500); list/get handlers gain a try/except so a transient Box RPC failure becomes a clean 400 instead of a stack trace Tests added for build_skill_extra_mounts (skip missing, skip empty, no skill manager) and SkillManager.reload_skills (drop missing on Box path). Full unit suite: 279 passed. Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>