diff --git a/skills/nutrient-document-processing/LICENSE b/skills/nutrient-document-processing/LICENSE
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--- /dev/null
+++ b/skills/nutrient-document-processing/LICENSE
@@ -0,0 +1,190 @@
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diff --git a/skills/nutrient-document-processing/SKILL.md b/skills/nutrient-document-processing/SKILL.md
new file mode 100644
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--- /dev/null
+++ b/skills/nutrient-document-processing/SKILL.md
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+---
+name: nutrient-document-processing
+description: >-
+  Process documents with the Nutrient DWS API. Use this skill when the user wants to convert documents
+  (PDF, DOCX, XLSX, PPTX, HTML, images), extract text or tables from PDFs, OCR scanned documents,
+  redact sensitive information (PII, SSN, emails, credit cards), add watermarks, digitally sign PDFs,
+  fill PDF forms, or check API credit usage. Activates on keywords: PDF, document, convert, extract,
+  OCR, redact, watermark, sign, merge, compress, form fill, document processing.
+license: Apache-2.0
+compatibility: >-
+  Requires Node.js 18+ and an internet connection. Works with Claude Code, Codex CLI, Gemini CLI,
+  OpenCode, Cursor, Windsurf, GitHub Copilot, Amp, or any Agent Skills-compatible product.
+  Alternatively, use curl for direct API access without Node.js.
+metadata:
+  author: nutrient-sdk
+  version: "1.0"
+  homepage: "https://www.nutrient.io/api/"
+  repository: "https://github.com/PSPDFKit-labs/nutrient-agent-skill"
+---
+
+# Nutrient Document Processing
+
+Process, convert, extract, redact, sign, and manipulate documents using the [Nutrient DWS Processor API](https://www.nutrient.io/api/).
+
+## Setup
+
+You need a Nutrient DWS API key. Get one free at <https://dashboard.nutrient.io/sign_up/?product=processor>.
+
+### Option 1: MCP Server (Recommended)
+
+If your agent supports MCP (Model Context Protocol), use the Nutrient DWS MCP Server. It provides all operations as native tools.
+
+**Configure your MCP client** (e.g., `claude_desktop_config.json` or `.mcp.json`):
+
+```json
+{
+  "mcpServers": {
+    "nutrient-dws": {
+      "command": "npx",
+      "args": ["-y", "@nutrient-sdk/dws-mcp-server"],
+      "env": {
+        "NUTRIENT_DWS_API_KEY": "YOUR_API_KEY",
+        "SANDBOX_PATH": "/path/to/working/directory"
+      }
+    }
+  }
+}
+```
+
+Then use the MCP tools directly (e.g., `convert_to_pdf`, `extract_text`, `redact`, etc.).
+
+### Option 2: Direct API (curl)
+
+For agents without MCP support, call the API directly:
+
+```bash
+export NUTRIENT_API_KEY="your_api_key_here"
+```
+
+All requests go to `https://api.nutrient.io/build` as multipart POST with an `instructions` JSON field.
+
+## Operations
+
+### 1. Convert Documents
+
+Convert between PDF, DOCX, XLSX, PPTX, HTML, and image formats.
+
+**HTML to PDF:**
+```bash
+curl -X POST https://api.nutrient.io/build \
+  -H "Authorization: Bearer $NUTRIENT_API_KEY" \
+  -F "index.html=@index.html" \
+  -F 'instructions={"parts":[{"html":"index.html"}]}' \
+  -o output.pdf
+```
+
+**DOCX to PDF:**
+```bash
+curl -X POST https://api.nutrient.io/build \
+  -H "Authorization: Bearer $NUTRIENT_API_KEY" \
+  -F "document.docx=@document.docx" \
+  -F 'instructions={"parts":[{"file":"document.docx"}]}' \
+  -o output.pdf
+```
+
+**PDF to DOCX/XLSX/PPTX:**
+```bash
+curl -X POST https://api.nutrient.io/build \
+  -H "Authorization: Bearer $NUTRIENT_API_KEY" \
+  -F "document.pdf=@document.pdf" \
+  -F 'instructions={"parts":[{"file":"document.pdf"}],"output":{"type":"docx"}}' \
+  -o output.docx
+```
+
+**Image to PDF:**
+```bash
+curl -X POST https://api.nutrient.io/build \
+  -H "Authorization: Bearer $NUTRIENT_API_KEY" \
+  -F "image.jpg=@image.jpg" \
+  -F 'instructions={"parts":[{"file":"image.jpg"}]}' \
+  -o output.pdf
+```
+
+### 2. Extract Text and Data
+
+**Extract plain text:**
+```bash
+curl -X POST https://api.nutrient.io/build \
+  -H "Authorization: Bearer $NUTRIENT_API_KEY" \
+  -F "document.pdf=@document.pdf" \
+  -F 'instructions={"parts":[{"file":"document.pdf"}],"output":{"type":"text"}}' \
+  -o output.txt
+```
+
+**Extract tables (as JSON, CSV, or Excel):**
+```bash
+curl -X POST https://api.nutrient.io/build \
+  -H "Authorization: Bearer $NUTRIENT_API_KEY" \
+  -F "document.pdf=@document.pdf" \
+  -F 'instructions={"parts":[{"file":"document.pdf"}],"output":{"type":"xlsx"}}' \
+  -o tables.xlsx
+```
+
+**Extract key-value pairs:**
+```bash
+curl -X POST https://api.nutrient.io/build \
+  -H "Authorization: Bearer $NUTRIENT_API_KEY" \
+  -F "document.pdf=@document.pdf" \
+  -F 'instructions={"parts":[{"file":"document.pdf"}],"actions":[{"type":"extraction","strategy":"key-values"}]}' \
+  -o result.json
+```
+
+### 3. OCR Scanned Documents
+
+Apply OCR to scanned PDFs or images, producing searchable PDFs with selectable text.
+
+```bash
+curl -X POST https://api.nutrient.io/build \
+  -H "Authorization: Bearer $NUTRIENT_API_KEY" \
+  -F "scanned.pdf=@scanned.pdf" \
+  -F 'instructions={"parts":[{"file":"scanned.pdf"}],"actions":[{"type":"ocr","language":"english"}]}' \
+  -o searchable.pdf
+```
+
+Supported languages: `english`, `german`, `french`, `spanish`, `italian`, `portuguese`, `dutch`, `swedish`, `danish`, `norwegian`, `finnish`, `polish`, `czech`, `turkish`, `japanese`, `korean`, `chinese-simplified`, `chinese-traditional`, `arabic`, `hebrew`, `thai`, `hindi`, `russian`, and more.
+
+### 4. Redact Sensitive Information
+
+**Pattern-based redaction** (preset patterns):
+```bash
+curl -X POST https://api.nutrient.io/build \
+  -H "Authorization: Bearer $NUTRIENT_API_KEY" \
+  -F "document.pdf=@document.pdf" \
+  -F 'instructions={"parts":[{"file":"document.pdf"}],"actions":[{"type":"redaction","strategy":"preset","preset":"social-security-number"}]}' \
+  -o redacted.pdf
+```
+
+Available presets: `social-security-number`, `credit-card-number`, `email-address`, `north-american-phone-number`, `international-phone-number`, `date`, `url`, `ipv4`, `ipv6`, `mac-address`, `us-zip-code`, `vin`, `time`.
+
+**Regex-based redaction:**
+```bash
+curl -X POST https://api.nutrient.io/build \
+  -H "Authorization: Bearer $NUTRIENT_API_KEY" \
+  -F "document.pdf=@document.pdf" \
+  -F 'instructions={"parts":[{"file":"document.pdf"}],"actions":[{"type":"redaction","strategy":"regex","regex":"\\b[A-Z]{2}\\d{6}\\b"}]}' \
+  -o redacted.pdf
+```
+
+**AI-powered PII redaction:**
+```bash
+curl -X POST https://api.nutrient.io/build \
+  -H "Authorization: Bearer $NUTRIENT_API_KEY" \
+  -F "document.pdf=@document.pdf" \
+  -F 'instructions={"parts":[{"file":"document.pdf"}],"actions":[{"type":"ai_redaction","criteria":"All personally identifiable information"}]}' \
+  -o redacted.pdf
+```
+
+The `criteria` field accepts natural language (e.g., "Names and phone numbers", "Protected health information", "Financial account numbers").
+
+### 5. Add Watermarks
+
+**Text watermark:**
+```bash
+curl -X POST https://api.nutrient.io/build \
+  -H "Authorization: Bearer $NUTRIENT_API_KEY" \
+  -F "document.pdf=@document.pdf" \
+  -F 'instructions={"parts":[{"file":"document.pdf"}],"actions":[{"type":"watermark","text":"CONFIDENTIAL","fontSize":48,"fontColor":"#FF0000","opacity":0.5,"rotation":45,"width":"50%","height":"50%"}]}' \
+  -o watermarked.pdf
+```
+
+**Image watermark:**
+```bash
+curl -X POST https://api.nutrient.io/build \
+  -H "Authorization: Bearer $NUTRIENT_API_KEY" \
+  -F "document.pdf=@document.pdf" \
+  -F "logo.png=@logo.png" \
+  -F 'instructions={"parts":[{"file":"document.pdf"}],"actions":[{"type":"watermark","imagePath":"logo.png","width":"30%","height":"30%","opacity":0.3}]}' \
+  -o watermarked.pdf
+```
+
+### 6. Digital Signatures
+
+**Sign a PDF with CMS signature:**
+```bash
+curl -X POST https://api.nutrient.io/build \
+  -H "Authorization: Bearer $NUTRIENT_API_KEY" \
+  -F "document.pdf=@document.pdf" \
+  -F 'instructions={"parts":[{"file":"document.pdf"}],"actions":[{"type":"sign","signatureType":"cms","signerName":"John Doe","reason":"Approval","location":"New York"}]}' \
+  -o signed.pdf
+```
+
+**Sign with CAdES-B-LT (long-term validation):**
+```bash
+curl -X POST https://api.nutrient.io/build \
+  -H "Authorization: Bearer $NUTRIENT_API_KEY" \
+  -F "document.pdf=@document.pdf" \
+  -F 'instructions={"parts":[{"file":"document.pdf"}],"actions":[{"type":"sign","signatureType":"cades","cadesLevel":"b-lt","signerName":"Jane Smith"}]}' \
+  -o signed.pdf
+```
+
+### 7. Form Filling (Instant JSON)
+
+Fill PDF form fields using Instant JSON format:
+```bash
+curl -X POST https://api.nutrient.io/build \
+  -H "Authorization: Bearer $NUTRIENT_API_KEY" \
+  -F "form.pdf=@form.pdf" \
+  -F 'instructions={"parts":[{"file":"form.pdf"}],"actions":[{"type":"fillForm","fields":[{"name":"firstName","value":"John"},{"name":"lastName","value":"Doe"},{"name":"email","value":"john@example.com"}]}]}' \
+  -o filled.pdf
+```
+
+### 8. Merge and Split PDFs
+
+**Merge multiple PDFs:**
+```bash
+curl -X POST https://api.nutrient.io/build \
+  -H "Authorization: Bearer $NUTRIENT_API_KEY" \
+  -F "doc1.pdf=@doc1.pdf" \
+  -F "doc2.pdf=@doc2.pdf" \
+  -F 'instructions={"parts":[{"file":"doc1.pdf"},{"file":"doc2.pdf"}]}' \
+  -o merged.pdf
+```
+
+**Extract specific pages:**
+```bash
+curl -X POST https://api.nutrient.io/build \
+  -H "Authorization: Bearer $NUTRIENT_API_KEY" \
+  -F "document.pdf=@document.pdf" \
+  -F 'instructions={"parts":[{"file":"document.pdf","pages":{"start":0,"end":4}}]}' \
+  -o pages1-5.pdf
+```
+
+### 9. Render PDF Pages as Images
+
+```bash
+curl -X POST https://api.nutrient.io/build \
+  -H "Authorization: Bearer $NUTRIENT_API_KEY" \
+  -F "document.pdf=@document.pdf" \
+  -F 'instructions={"parts":[{"file":"document.pdf","pages":{"start":0,"end":0}}],"output":{"type":"png","dpi":300}}' \
+  -o page1.png
+```
+
+### 10. Check Credits
+
+```bash
+curl -X GET https://api.nutrient.io/credits \
+  -H "Authorization: Bearer $NUTRIENT_API_KEY"
+```
+
+## Best Practices
+
+1. **Use the MCP server** when your agent supports it — it handles file I/O, error handling, and sandboxing automatically.
+2. **Set `SANDBOX_PATH`** to restrict file access to a specific directory.
+3. **Check credit balance** before batch operations to avoid interruptions.
+4. **Use AI redaction** for complex PII detection; use preset/regex redaction for known patterns (faster, cheaper).
+5. **Chain operations** — the API supports multiple actions in a single call (e.g., OCR then redact).
+
+## Troubleshooting
+
+| Issue | Solution |
+|-------|----------|
+| 401 Unauthorized | Check your API key is valid and has credits |
+| 413 Payload Too Large | Files must be under 100 MB |
+| Slow AI redaction | AI analysis takes 60–120 seconds; this is normal |
+| OCR quality poor | Try a different language parameter or improve scan quality |
+| Missing text in extraction | Run OCR first on scanned documents |
+
+## More Information
+
+- [Full API reference](references/REFERENCE.md) — Detailed endpoints, parameters, and error codes
+- [API Playground](https://dashboard.nutrient.io/processor-api/playground/) — Interactive API testing
+- [API Documentation](https://www.nutrient.io/guides/dws-processor/) — Official guides
+- [MCP Server repo](https://github.com/PSPDFKit/nutrient-dws-mcp-server) — Source code and issues
diff --git a/skills/nutrient-document-processing/references/REFERENCE.md b/skills/nutrient-document-processing/references/REFERENCE.md
new file mode 100644
index 00000000..0ac9b2b0
--- /dev/null
+++ b/skills/nutrient-document-processing/references/REFERENCE.md
@@ -0,0 +1,598 @@
+# Nutrient DWS Processor API Reference
+
+Complete API reference for the Nutrient Document Web Services (DWS) Processor API.
+
+## Base URL
+
+```
+https://api.nutrient.io
+```
+
+## Authentication
+
+All requests require a Bearer token in the `Authorization` header:
+
+```
+Authorization: Bearer YOUR_API_KEY
+```
+
+Get your API key at <https://dashboard.nutrient.io/sign_up/?product=processor>.
+
+## Main Endpoint
+
+### POST /build
+
+The primary endpoint for all document processing operations. Accepts multipart form data with file uploads and a JSON `instructions` field.
+
+**Request format:**
+```
+POST https://api.nutrient.io/build
+Content-Type: multipart/form-data
+Authorization: Bearer YOUR_API_KEY
+
+Form fields:
+  - One or more file uploads (name must match what's referenced in instructions)
+  - instructions: JSON object defining the processing pipeline
+```
+
+**Instructions JSON structure:**
+```json
+{
+  "parts": [
+    {
+      "file": "filename.pdf",
+      "pages": { "start": 0, "end": -1 },
+      "password": "optional-password"
+    }
+  ],
+  "actions": [
+    { "type": "action_type", ...action_params }
+  ],
+  "output": {
+    "type": "pdf",
+    "owner_password": "optional",
+    "user_password": "optional"
+  }
+}
+```
+
+## Document Conversion
+
+### Office to PDF
+
+Convert DOCX, XLSX, PPTX to PDF.
+
+```bash
+curl -X POST https://api.nutrient.io/build \
+  -H "Authorization: Bearer $NUTRIENT_API_KEY" \
+  -F "document.docx=@document.docx" \
+  -F 'instructions={"parts":[{"file":"document.docx"}]}' \
+  -o output.pdf
+```
+
+Supported input formats: `.docx`, `.xlsx`, `.pptx`, `.doc`, `.xls`, `.ppt`, `.odt`, `.ods`, `.odp`, `.rtf`.
+
+### HTML to PDF
+
+```bash
+curl -X POST https://api.nutrient.io/build \
+  -H "Authorization: Bearer $NUTRIENT_API_KEY" \
+  -F "index.html=@index.html" \
+  -F 'instructions={"parts":[{"html":"index.html"}]}' \
+  -o output.pdf
+```
+
+**With layout options:**
+```json
+{
+  "parts": [{ "html": "index.html" }],
+  "output": {
+    "type": "pdf",
+    "layout": {
+      "orientation": "landscape",
+      "size": "A4",
+      "margin": { "top": 20, "bottom": 20, "left": 15, "right": 15 }
+    }
+  }
+}
+```
+
+Supported sizes: `A0`–`A8`, `Letter`, `Legal`, or custom `{ "width": N, "height": N }` in points.
+
+### Image to PDF
+
+```bash
+curl -X POST https://api.nutrient.io/build \
+  -H "Authorization: Bearer $NUTRIENT_API_KEY" \
+  -F "photo.jpg=@photo.jpg" \
+  -F 'instructions={"parts":[{"file":"photo.jpg"}]}' \
+  -o output.pdf
+```
+
+Supported image formats: `.jpg`, `.jpeg`, `.png`, `.gif`, `.webp`, `.tiff`, `.bmp`.
+
+### PDF to Office
+
+```bash
+curl -X POST https://api.nutrient.io/build \
+  -H "Authorization: Bearer $NUTRIENT_API_KEY" \
+  -F "document.pdf=@document.pdf" \
+  -F 'instructions={"parts":[{"file":"document.pdf"}],"output":{"type":"docx"}}' \
+  -o output.docx
+```
+
+Supported output types: `docx`, `xlsx`, `pptx`.
+
+### PDF to Image
+
+```bash
+curl -X POST https://api.nutrient.io/build \
+  -H "Authorization: Bearer $NUTRIENT_API_KEY" \
+  -F "document.pdf=@document.pdf" \
+  -F 'instructions={"parts":[{"file":"document.pdf","pages":{"start":0,"end":0}}],"output":{"type":"png","dpi":150}}' \
+  -o page.png
+```
+
+**Output parameters:**
+| Parameter | Type | Default | Description |
+|-----------|------|---------|-------------|
+| `type` | string | `pdf` | `png`, `jpeg`, `webp` |
+| `dpi` | number | 150 | Resolution (72–600) |
+| `width` | number | — | Output width in pixels |
+| `height` | number | — | Output height in pixels |
+
+## Text and Data Extraction
+
+### Extract Text
+
+```bash
+curl -X POST https://api.nutrient.io/build \
+  -H "Authorization: Bearer $NUTRIENT_API_KEY" \
+  -F "document.pdf=@document.pdf" \
+  -F 'instructions={"parts":[{"file":"document.pdf"}],"output":{"type":"text"}}' \
+  -o extracted.txt
+```
+
+### Extract Tables
+
+Export tables to Excel, XML, JSON, or CSV:
+
+```bash
+# To Excel
+curl -X POST https://api.nutrient.io/build \
+  -H "Authorization: Bearer $NUTRIENT_API_KEY" \
+  -F "document.pdf=@document.pdf" \
+  -F 'instructions={"parts":[{"file":"document.pdf"}],"actions":[{"type":"extraction","strategy":"tables"}],"output":{"type":"xlsx"}}' \
+  -o tables.xlsx
+```
+
+### Extract Key-Value Pairs
+
+Detect structured data like names, dates, addresses, phone numbers:
+
+```bash
+curl -X POST https://api.nutrient.io/build \
+  -H "Authorization: Bearer $NUTRIENT_API_KEY" \
+  -F "document.pdf=@document.pdf" \
+  -F 'instructions={"parts":[{"file":"document.pdf"}],"actions":[{"type":"extraction","strategy":"key-values"}],"output":{"type":"json"}}' \
+  -o pairs.json
+```
+
+## OCR (Optical Character Recognition)
+
+### Basic OCR
+
+```bash
+curl -X POST https://api.nutrient.io/build \
+  -H "Authorization: Bearer $NUTRIENT_API_KEY" \
+  -F "scanned.pdf=@scanned.pdf" \
+  -F 'instructions={"parts":[{"file":"scanned.pdf"}],"actions":[{"type":"ocr","language":"english"}]}' \
+  -o searchable.pdf
+```
+
+### Multi-Language OCR
+
+```json
+{
+  "parts": [{ "file": "scanned.pdf" }],
+  "actions": [{ "type": "ocr", "language": ["english", "german", "french"] }]
+}
+```
+
+### Supported OCR Languages
+
+| Language | Code | Language | Code |
+|----------|------|----------|------|
+| English | `english` | Japanese | `japanese` |
+| German | `german` | Korean | `korean` |
+| French | `french` | Chinese (Simplified) | `chinese-simplified` |
+| Spanish | `spanish` | Chinese (Traditional) | `chinese-traditional` |
+| Italian | `italian` | Arabic | `arabic` |
+| Portuguese | `portuguese` | Hebrew | `hebrew` |
+| Dutch | `dutch` | Thai | `thai` |
+| Swedish | `swedish` | Hindi | `hindi` |
+| Danish | `danish` | Russian | `russian` |
+| Norwegian | `norwegian` | Polish | `polish` |
+| Finnish | `finnish` | Czech | `czech` |
+| Turkish | `turkish` | | |
+
+### OCR on Images
+
+Also works on standalone images (JPEG, PNG, TIFF):
+
+```bash
+curl -X POST https://api.nutrient.io/build \
+  -H "Authorization: Bearer $NUTRIENT_API_KEY" \
+  -F "scan.jpg=@scan.jpg" \
+  -F 'instructions={"parts":[{"file":"scan.jpg"}],"actions":[{"type":"ocr","language":"english"}]}' \
+  -o searchable.pdf
+```
+
+## Redaction
+
+### Preset Pattern Redaction
+
+```bash
+curl -X POST https://api.nutrient.io/build \
+  -H "Authorization: Bearer $NUTRIENT_API_KEY" \
+  -F "document.pdf=@document.pdf" \
+  -F 'instructions={"parts":[{"file":"document.pdf"}],"actions":[{"type":"redaction","strategy":"preset","preset":"email-address"}]}' \
+  -o redacted.pdf
+```
+
+**Available presets:**
+
+| Preset | Matches |
+|--------|---------|
+| `social-security-number` | US SSNs (XXX-XX-XXXX) |
+| `credit-card-number` | Visa, MasterCard, Amex, etc. |
+| `email-address` | Email addresses |
+| `north-american-phone-number` | US/Canada phone numbers |
+| `international-phone-number` | International format numbers |
+| `date` | Common date formats |
+| `url` | Web URLs |
+| `ipv4` | IPv4 addresses |
+| `ipv6` | IPv6 addresses |
+| `mac-address` | MAC addresses |
+| `us-zip-code` | US ZIP codes |
+| `vin` | Vehicle identification numbers |
+| `time` | Time values |
+
+### Regex Redaction
+
+```bash
+curl -X POST https://api.nutrient.io/build \
+  -H "Authorization: Bearer $NUTRIENT_API_KEY" \
+  -F "document.pdf=@document.pdf" \
+  -F 'instructions={"parts":[{"file":"document.pdf"}],"actions":[{"type":"redaction","strategy":"regex","regex":"\\b\\d{3}-\\d{2}-\\d{4}\\b","caseSensitive":false}]}' \
+  -o redacted.pdf
+```
+
+### Text-Match Redaction
+
+```bash
+curl -X POST https://api.nutrient.io/build \
+  -H "Authorization: Bearer $NUTRIENT_API_KEY" \
+  -F "document.pdf=@document.pdf" \
+  -F 'instructions={"parts":[{"file":"document.pdf"}],"actions":[{"type":"redaction","strategy":"text","text":"CLASSIFIED","caseSensitive":false}]}' \
+  -o redacted.pdf
+```
+
+### AI-Powered Redaction
+
+Uses AI to detect and redact PII based on natural-language criteria. Takes 60–120 seconds.
+
+```bash
+curl -X POST https://api.nutrient.io/build \
+  -H "Authorization: Bearer $NUTRIENT_API_KEY" \
+  -F "document.pdf=@document.pdf" \
+  -F 'instructions={"parts":[{"file":"document.pdf"}],"actions":[{"type":"ai_redaction","criteria":"All personally identifiable information"}]}' \
+  -o redacted.pdf
+```
+
+**Example criteria:**
+- `"All personally identifiable information"`
+- `"Names, email addresses, and phone numbers"`
+- `"Protected health information (PHI)"`
+- `"Social security numbers and credit card numbers"`
+- `"Financial account numbers and routing numbers"`
+
+**Redaction action parameters:**
+
+| Parameter | Type | Description |
+|-----------|------|-------------|
+| `strategy` | string | `preset`, `regex`, `text`, or (for AI) use `type: ai_redaction` |
+| `preset` | string | Preset pattern name (when strategy=preset) |
+| `regex` | string | Regular expression (when strategy=regex) |
+| `text` | string | Exact text to match (when strategy=text) |
+| `caseSensitive` | boolean | Default: true for regex, false for text |
+| `startPage` | integer | Start page index (0-based) |
+| `pageLimit` | integer | Number of pages to process |
+| `includeAnnotations` | boolean | Also redact matching annotations (default: true) |
+| `criteria` | string | Natural language criteria (for ai_redaction) |
+
+## Watermarking
+
+### Text Watermark
+
+```bash
+curl -X POST https://api.nutrient.io/build \
+  -H "Authorization: Bearer $NUTRIENT_API_KEY" \
+  -F "document.pdf=@document.pdf" \
+  -F 'instructions={"parts":[{"file":"document.pdf"}],"actions":[{"type":"watermark","watermarkType":"text","text":"DRAFT","fontSize":72,"fontColor":"#FF0000","opacity":0.3,"rotation":45,"width":"50%","height":"50%"}]}' \
+  -o watermarked.pdf
+```
+
+### Image Watermark
+
+```bash
+curl -X POST https://api.nutrient.io/build \
+  -H "Authorization: Bearer $NUTRIENT_API_KEY" \
+  -F "document.pdf=@document.pdf" \
+  -F "logo.png=@logo.png" \
+  -F 'instructions={"parts":[{"file":"document.pdf"}],"actions":[{"type":"watermark","watermarkType":"image","imagePath":"logo.png","width":"25%","height":"25%","opacity":0.5}]}' \
+  -o watermarked.pdf
+```
+
+**Watermark parameters:**
+
+| Parameter | Type | Description |
+|-----------|------|-------------|
+| `watermarkType` | string | `text` or `image` |
+| `text` | string | Watermark text (when type=text) |
+| `imagePath` | string | Image filename (when type=image) |
+| `fontSize` | number | Font size in points |
+| `fontColor` | string | Hex color (e.g., `#FF0000`) |
+| `opacity` | number | 0–1 (default: 0.7) |
+| `rotation` | number | Degrees counter-clockwise |
+| `width` | string/number | Width in points or percentage (e.g., `"50%"`) |
+| `height` | string/number | Height in points or percentage |
+
+## Digital Signatures
+
+### CMS Signature
+
+```bash
+curl -X POST https://api.nutrient.io/build \
+  -H "Authorization: Bearer $NUTRIENT_API_KEY" \
+  -F "document.pdf=@document.pdf" \
+  -F 'instructions={"parts":[{"file":"document.pdf"}],"actions":[{"type":"sign","signatureType":"cms","signerName":"John Doe","reason":"Document approval","location":"San Francisco"}]}' \
+  -o signed.pdf
+```
+
+### CAdES Signature
+
+```bash
+curl -X POST https://api.nutrient.io/build \
+  -H "Authorization: Bearer $NUTRIENT_API_KEY" \
+  -F "document.pdf=@document.pdf" \
+  -F 'instructions={"parts":[{"file":"document.pdf"}],"actions":[{"type":"sign","signatureType":"cades","cadesLevel":"b-lt","signerName":"Jane Smith"}]}' \
+  -o signed.pdf
+```
+
+### Visible Signature
+
+Add a visual signature appearance on a specific page:
+
+```json
+{
+  "parts": [{ "file": "document.pdf" }],
+  "actions": [{
+    "type": "sign",
+    "signatureType": "cms",
+    "signerName": "John Doe",
+    "pageIndex": 0,
+    "rect": [50, 700, 200, 50]
+  }]
+}
+```
+
+**Signature parameters:**
+
+| Parameter | Type | Default | Description |
+|-----------|------|---------|-------------|
+| `signatureType` | string | `cms` | `cms` or `cades` |
+| `cadesLevel` | string | `b-lt` | `b-b`, `b-t`, or `b-lt` (CAdES only) |
+| `signerName` | string | — | Signer's name |
+| `reason` | string | — | Reason for signing |
+| `location` | string | — | Signing location |
+| `pageIndex` | integer | — | Page for visible signature (0-based). Omit for invisible. |
+| `rect` | array | — | `[left, top, width, height]` in PDF points |
+| `flatten` | boolean | false | Flatten document before signing |
+| `graphicImagePath` | string | — | Path to signature graphic |
+| `watermarkImagePath` | string | — | Path to watermark image overlay |
+
+## PDF Manipulation
+
+### Merge PDFs
+
+```bash
+curl -X POST https://api.nutrient.io/build \
+  -H "Authorization: Bearer $NUTRIENT_API_KEY" \
+  -F "doc1.pdf=@doc1.pdf" \
+  -F "doc2.pdf=@doc2.pdf" \
+  -F "doc3.pdf=@doc3.pdf" \
+  -F 'instructions={"parts":[{"file":"doc1.pdf"},{"file":"doc2.pdf"},{"file":"doc3.pdf"}]}' \
+  -o merged.pdf
+```
+
+### Extract Page Ranges
+
+```bash
+curl -X POST https://api.nutrient.io/build \
+  -H "Authorization: Bearer $NUTRIENT_API_KEY" \
+  -F "document.pdf=@document.pdf" \
+  -F 'instructions={"parts":[{"file":"document.pdf","pages":{"start":0,"end":4}}]}' \
+  -o first-5-pages.pdf
+```
+
+Pages use 0-based indexing. `"end": -1` means the last page.
+
+### Flatten PDF
+
+Remove interactive elements (form fields, annotations):
+
+```json
+{
+  "parts": [{ "file": "document.pdf" }],
+  "actions": [{ "type": "flatten" }]
+}
+```
+
+### Rotate Pages
+
+```json
+{
+  "parts": [{ "file": "document.pdf" }],
+  "actions": [{ "type": "rotate", "rotation": 90, "pages": [0, 1, 2] }]
+}
+```
+
+## Form Filling
+
+### Fill Form Fields
+
+```json
+{
+  "parts": [{ "file": "form.pdf" }],
+  "actions": [{
+    "type": "fillForm",
+    "fields": [
+      { "name": "firstName", "value": "John" },
+      { "name": "lastName", "value": "Doe" },
+      { "name": "email", "value": "john@example.com" },
+      { "name": "agree", "value": true }
+    ]
+  }]
+}
+```
+
+## Password Protection
+
+### Encrypt a PDF
+
+```json
+{
+  "parts": [{ "file": "document.pdf" }],
+  "output": {
+    "type": "pdf",
+    "owner_password": "owner123",
+    "user_password": "user456"
+  }
+}
+```
+
+### Open a Password-Protected PDF
+
+```json
+{
+  "parts": [{ "file": "protected.pdf", "password": "user456" }]
+}
+```
+
+## Credit Management
+
+### Check Balance
+
+```bash
+curl -X GET https://api.nutrient.io/credits \
+  -H "Authorization: Bearer $NUTRIENT_API_KEY"
+```
+
+**Response:**
+```json
+{
+  "remaining": 9500,
+  "total": 10000,
+  "usage": {
+    "period": "week",
+    "used": 500
+  }
+}
+```
+
+### Check Usage by Operation
+
+```bash
+curl -X GET "https://api.nutrient.io/credits/usage?period=month" \
+  -H "Authorization: Bearer $NUTRIENT_API_KEY"
+```
+
+## Chaining Actions
+
+Multiple actions can be chained in a single API call:
+
+```json
+{
+  "parts": [{ "file": "scanned.pdf" }],
+  "actions": [
+    { "type": "ocr", "language": "english" },
+    { "type": "redaction", "strategy": "preset", "preset": "social-security-number" },
+    { "type": "redaction", "strategy": "preset", "preset": "email-address" },
+    { "type": "watermark", "watermarkType": "text", "text": "REDACTED", "fontSize": 36, "opacity": 0.2, "rotation": 45, "width": "50%", "height": "50%" },
+    { "type": "sign", "signatureType": "cms", "signerName": "Compliance Dept" }
+  ]
+}
+```
+
+Actions execute in order. This example: OCR → redact SSNs → redact emails → add watermark → sign.
+
+## Error Handling
+
+### HTTP Status Codes
+
+| Code | Meaning |
+|------|---------|
+| 200 | Success — response body is the output file |
+| 400 | Bad request — invalid instructions or missing required fields |
+| 401 | Unauthorized — invalid or missing API key |
+| 402 | Payment required — insufficient credits |
+| 413 | Payload too large — file exceeds 100 MB limit |
+| 415 | Unsupported media type — unsupported input format |
+| 422 | Unprocessable entity — valid format but cannot process |
+| 429 | Rate limited — too many requests |
+| 500 | Server error — retry with exponential backoff |
+
+### Error Response Format
+
+```json
+{
+  "error": {
+    "code": "invalid_instructions",
+    "message": "The 'parts' field is required",
+    "details": {}
+  }
+}
+```
+
+### Common Errors and Solutions
+
+| Error | Cause | Solution |
+|-------|-------|----------|
+| `file_not_found` | Referenced file not in upload | Ensure filename in instructions matches upload field name |
+| `unsupported_format` | Input format not recognized | Check supported formats list |
+| `password_required` | PDF is encrypted | Add `"password"` to the part |
+| `insufficient_credits` | Account out of credits | Top up at dashboard.nutrient.io |
+| `ocr_language_invalid` | Unsupported OCR language | Check supported languages table |
+
+## Rate Limits
+
+- Free tier: 100 requests/minute
+- Paid tiers: Higher limits based on plan
+- Use `429` status code to detect rate limiting
+- Implement exponential backoff for retries
+
+## File Size Limits
+
+- Maximum input file: 100 MB
+- Maximum total upload: 500 MB per request
+- Recommended: Keep files under 50 MB for fastest processing
+
+## Additional Resources
+
+- [API Playground](https://dashboard.nutrient.io/processor-api/playground/) — Interactive testing
+- [API Documentation](https://www.nutrient.io/guides/dws-processor/) — Official guides
+- [MCP Server](https://github.com/PSPDFKit/nutrient-dws-mcp-server) — For AI agent integration
+- [npm Package](https://www.npmjs.com/package/@nutrient-sdk/dws-mcp-server) — MCP server on npm
+- [Dashboard](https://dashboard.nutrient.io/) — Manage API keys and credits
+- [Sign Up](https://dashboard.nutrient.io/sign_up/?product=processor) — Get a free API key