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A user wants to manage patrimonial history — a document-backed record of a family's wealth where every figure traces back to the statement it came from — by pointing an external agent harness at Sure. That model belongs in the harness, not in Sure: it needs numbered build deltas, golden tests and closed periods that a mutable Postgres row cannot provide. What Sure was missing was the seam. The Statement Vault already does most of the work — original bytes retained, SHA-256 dedup, period detection, account matching with a confidence score, reconciliation against ledger balances, and a month-by-month coverage map — but it is reachable only from the web UI. An agent could not archive a document, cite one, or check for gaps. Adds five preview MCP tools over what already exists, plus a citation grammar for values the agent writes: - upload_account_statement, list_account_statements, get_account_statement, get_statement_coverage - record_valuation, whose source citation is parsed rather than trusted: ["estimated: "] citation [" (grade: A|B|C)"]. An uncited or free-styled value is rejected at the write boundary instead of landing in the ledger looking authoritative. link and reject are deliberately not exposed. Attaching a statement to an account is the human's decision, and the vault UI is where it is made; the agent reports the suggested match and stops there. Assistant.function_classes now takes a user so preview tools stay out of the default surface. They are hidden from tools/list and not callable by name without the preference enabled, and the vault tools re-check the manager role and per-account permissions, since MCP calls never pass through a controller. Docs: the blueprint this implements, and a guide covering which side owns which layer, the vocabulary map between the two, the monthly runbook, and the gaps (non-user holders, non-statement documents, one value per date). No migrations, no API endpoints, no UI. Co-Authored-By: Claude Opus 5 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01JFDp9HhXDeswadu4cxFojn