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`/pr-triage [[ … [412 lines] … ]]` dispatched the LABEL: the paste expansion was computed but only consumed by /queue, so every other command received "[412 lines]" as its argument and the agent faithfully reported the paste as truncated. prepareSlashSubmission names the split the branch actually needs — the transcript keeps the collapsed label, the dispatch carries the full text. Image tokens stay as labels, since the gateway already holds those files in attached_images.