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882c9ae8f5
In separated deployments (Docker Compose, k8s sidecar, --standalone-box, remote runtime.endpoint) the Box runtime owns its own filesystem, so the skill package_root it reports via list_skills is not resolvable on the LangBot side. LangBot's reload_skills and build_skill_extra_mounts validated those paths with os.path.isdir() against its own filesystem, which silently dropped every skill in such deployments — breaking the sandbox skill feature for the nsjail/SaaS backend. Add BoxService.shares_filesystem_with_box, derived from the connector transport (stdio = shared, WebSocket = separated), with an explicit override seam for tests/embedders. Gate both isdir() guards on it: keep local validation in shared-fs stdio mode, trust Box-reported paths otherwise. The Box runtime only reports skills found on its own filesystem, so those paths are valid there by construction. Adds topology-derivation tests (real connector, no mocks) and skill-retention tests for both shared and separated filesystems.