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Every deploy tarred the whole published tree into `smogonctl assets upload`: a few hundred megabytes of stamped files the home already had, and a 512-byte header for each of the thousands of links under __meta/. A served name carries a content hash and the tree is add-only, so a name the home has is a file that needn't travel. The deploy now opens the same stdin with a manifest -- every name with its size, every link -- and reads the reply off the command's stdout: the positions it hasn't got. Only those and the __meta/ files are then tarred into the same stream. The format is binary and length prefixed, so a name is whatever bytes a tar would carry for it. The reply is read strictly from the first byte: anything else on stdout, the command's own refusal or a shell profile printing over ssh, is relayed whole, stdin is closed so the command sees the end of the stream, and the deploy fails with its exit code. The progress bar counts what travels. `run --tar` still writes a bare tar, which the upload also takes. Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_014b7csvcRmyygDYQun3mE6E