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From the fourth E2E run: the agent correctly refused to reproduce a 104 KB SIE file token by token (silent mid-verifikat truncation) and dead-ended to the web wizard, and its replies were walls of compliance prose. 1. gnubok_create_sie_upload: signed same-origin upload URL (reuses the pending-document infra; .se/.sie/.si only, 50 MB HTTP cap). gnubok_sie_preflight and gnubok_import_sie accept upload_id as the byte-exact source, plus optional sha256 (hex of the raw bytes) verified on the upload_id/base64 paths so truncation is DETECTED, never silent. Inline content above 120k chars is refused with a pointer to the upload flow. Scope bookkeeping:write (same intent as import_sie). 2. Skill: brevity rule (max ~8 short lines per reply, one warning per step, no legal essays), memory-first rule (check what is already known before asking the opening questions), the upload-first SIE step, and gnubok_explain_voucher_gap after import for skipped voucher numbers. 3. CONNECTORS.md starter prompt rewritten memory-first so it stays copy-paste ready without the user's own data in it. Plugin v1.2.2. tools/list ceiling 62K to 62.4K documented in the bench. Co-authored-by: Jakob Wennberg <311770904+jakobwennberg-oss@users.noreply.github.com> Co-authored-by: Claude Fable 5 <noreply@anthropic.com>