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The residual door existed for the page and the v1 API (#1862) but not for agents: an MCP client that found a 10 kr bank fee between a selection and its verifikat had to hand the last step back to the user. gnubok_reconcile_residual dry-runs lib/reconciliation/residual.ts at stage time (so zero / cap / direction / skattekonto refusals surface immediately), stages a reconciliation_residual operation with the would-book verifikat as the preview, and commitReconciliationResidual links and books on approval. Risk 'medium' (one typed verifikat bounded by RESIDUAL_MAX_AMOUNT, undone by storno + unmatch); scope transactions:write like the v1 route. The op type is added to the pending_operations CHECK (NOT VALID + VALIDATE pair, list verified against the live prod constraint 2026-08-25), and the tool joins the reconcile_month / close_period loadouts and the reconcile-month skill. Co-authored-by: Jakob Wennberg <311770904+jakobwennberg-oss@users.noreply.github.com> Co-authored-by: Claude Fable 5 <noreply@anthropic.com>