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After mkfs the agent re-resolves the bound durable id, requires it to name the device it just formatted, reads the superblock back (blkid -p, requested fstype) and returns fs_uuid in POST /disks/format and GET /disks/format/status. Anything unverified returns "" — never a path-resolved guess. The controller half (mount fs_uuid instead of re-resolving the UUID from the /dev path) is owed in felhom-controller. Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_0159rPz1ZhFKsS53msqPYxtS