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Structured Extraction

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Claude API2TypeScript2Document Processing1Data Validation1Production1Cost Optimization1document processing1verification1production1
⬡ API & SDK/2026-07-01Advanced

When Claude API Document Extraction Is Confidently Wrong — Field Notes on Catching Silent Errors with Invariants

In structured extraction from invoices and contracts, the real danger isn't a crash — it's a value that's silently wrong while the schema validates and confidence reads high. Field notes on invariants, two-pass extraction, and tracking field-level error rates.

⬡ API & SDK/2026-06-17Advanced

When Claude API Extracts the Wrong Value With Full Confidence — Designing the Verification Layer

When you extract invoices or contracts with Claude API, the scariest failure isn't an exception — it's plausible-but-wrong JSON. Here is how I build a verification layer that catches silent extraction errors with schema checks, arithmetic reconciliation, and dual-extraction agreement, in TypeScript.