{"version":"2.1.288","anchor":"new-attachment-prefetch-header-and-misc-small-fields","canonical_anchor":"new-attachment-prefetch-header-and-misc-small-fields","heading":"Small internal additions: an attachment prefetch header and saved-item fields","tier":"internal","area":"Sessions","scope":"individual","heads_up":false,"url":"https:\/\/changelogs.core-directive.com\/v\/2.1.288\/e\/new-attachment-prefetch-header-and-misc-small-fields","release_url":"https:\/\/changelogs.core-directive.com\/v\/2.1.288","markdown":"### Small internal additions: an attachment prefetch header and saved-item fields\n\nClaude Code gains a new attachment prefetch request header, two new fields on saved items, and a few small error-handling tweaks\n\n**Unclear.** It is not clear which requests carry the new attachment prefetch header.\n\n**What**\n\nThis release makes several small internal changes:\n\n- A request header, `x-anthropic-attachment-prefetch-seen: 1`, now exists. A request header is a short label attached to a message sent over the network.\n\n- Saved items can now record two extra optional values, `titleSha` and `usedAt`.\n\n- A usage report that confirms a feature is working can no longer stop Claude Code if it fails.\n\n- When Claude Code counts the changed lines in a diff (a comparison showing what changed in a file), a diff it refused to produce now counts as zero lines.\n\n**Why**\n\nThese are behind-the-scenes changes. You are unlikely to notice any difference day to day.\n\n- Area: Sessions\n- Tier: Under the hood\n- Useful: 1\/5\n- Signal: 1\/5\n- Scope: individual\n- Heads-up: no"}