Grounded Edit Parser

Verification by indexOf, not by another model

The usual answer to "did the model hallucinate this quote" is to ask a second model. This one looks for the string.

Every claimed span is normalised — smart quotes folded, dashes folded, whitespace collapsed, case flattened — and looked for in the normalised original. Found or not found is a FACT ON THE RECORD (`notFound`, `quoteVerified`), not an exception and not a silent drop. And the applier acts on that verdict, so the guard is not a number nobody reads.

The normalisation is the load-bearing part, in both directions

Fold too little and a faithfully-copied clause fails because the model rendered an apostrophe as a curly one, or the PDF wrapped a line. That is the FALSE-ALARM direction, and it is how a verification layer gets switched off within a week.

Fold too much and two genuinely different clauses start matching — the direction that lets a hallucination through wearing a verified badge.

It folds curly quotes, en/em dashes, non-breaking spaces, whitespace runs, and case. It does not fold anything that changes which words are present. Quote comparison uses the first 40 characters by default: enough to be evidence, short enough that a trailing ellipsis does not fail a real citation. Set it to 1 and the check becomes decoration.

Messy replies

Fenced or unfenced, tagged `json` or `summary-json` or nothing, prose above and below. An ILLUSTRATIVE fence — the schema sketch a model shows before its real answer — is skipped rather than parsed as the payload, because that sketch parses cleanly and nothing downstream notices until a field turns up missing.

Included as a worked example

The contract-redline and contract-summary schemas this came from ship with it, including the coercions that survive a model using a legacy field value. They are a complete example of the pattern rather than the point — the verification core is domain-free and the schemas are yours to replace.

Verified

35 tests, 8 deliberate defects, 7 caught. Caught defects include the anchor guard stamping everything found, quotes marked verified without being looked for, whitespace folding removed (which fails every line-wrapped citation), smart-quote folding removed (which fails every faithful copy), and the applier ignoring the notFound verdict entirely.

Delivery

Source delivered as a private repository invite within 24 hours of purchase. Single-product commercial license: use and modify in any number of products; no redistribution or resale of the source.

Interface

What you call, and what comes back. Types and signatures only — the implementation ships with the source.

  export function normalizeText(s: string): string;
  export function extractJsonBlock(text: string): string | null;
  export function coerceMarketPosition(v: unknown): MarketPosition | undefined;
  export function parseRedlineOutput(text: string): RedlineOutput | null;
  export function parseContractSummary(text: string): ContractSummary | null;
  export function verifyAnchors(out: RedlineOutput, original: string): RedlineOutput;
  export function applyEdits(original: string, edits: RedlineEdit[]): string;
  export function verifyQuotes<T extends { quote?: string }>( rows: T[], original: string, opts?: { minChars?: number }, ): (T &;