anvil-document-sdk

Anvil Document SDK Plugin

A Claude plugin that helps developers integrate Anvil's document automation APIs into their existing Node.js or TypeScript codebases.

Capabilities

• PDF Filling — Populate existing PDF templates with dynamic data
• HTML-to-PDF Generation — Create PDFs from HTML/CSS or structured Markdown
• Etch E-Sign — Send documents for electronic signature with embedded or email-based signing
• Workflows — Build multi-step document workflows with webforms and approvals

How It Works

When a developer mentions Anvil, PDF filling, e-signatures, or document automation, the skill triggers automatically and guides them through:

1. Quick Start — 5-minute setup to verify Anvil connectivity
2. Discovery — Identifies which Anvil products fit the developer's use case
3. Implementation Planning — Maps integration points in the existing codebase
4. Code Generation — Writes production-ready integration code

Included Reference Files

• pdf-filling.md — fillPDF patterns, route handlers, BLOB storage
• html-to-pdf.md — HTML/CSS and Markdown PDF generation, React SSR patterns
• etch-esign.md — createEtchPacket, signer configuration, embedded signing, document download
• workflows.md — forgeSubmit, webform pre-filling, iframe embedding, document download
• webhooks.md — Event registration and handler patterns for all products

Migration Script

The plugin bundles scripts/migrate-pdfs-to-anvil.ts for bulk uploading PDFs as Anvil templates. Features:

• AI-powered field detection (detectBoxesAdvanced, advancedDetectFields) with automatic fallback
• Schema-based field alias extraction (Prisma, Sequelize, TypeORM, JSON Schema, TypeScript)
• Rate limit handling and migration manifest generation

Requirements

• Anvil API key (get one at https://www.useanvil.com)
• Node.js / TypeScript codebase
• @anvilco/anvil npm package