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List Sandboxes

List all running sandboxes.
Each entry carries tags (always present, empty object when unset) and tagsLastUpdatedAt (null when unset). To filter by tag, use GET /api/usage?groupBy=sandbox&filter[tag:<key>]=<value>.
Response example
[ { "sandboxID": "sb-abc123", "status": "running", "region": "use2", "workerID": "w-use2-abc123", "tags": { "env": "prod" }, "tagsLastUpdatedAt": "2026-04-19T14:02:00Z" } ]