# Monitor a policy PDF for changes

**Use case:** 

Watch a public policy, terms or compliance PDF by its direct URL and get FILE_CHANGED, CONTENT_CHANGED, PAGE_ADDED/REMOVED and METADATA_CHANGED rows with page evidence and a bounded text diff. The first run stores and emits a BASELINE; schedule it weekly.

## Input

```json
{
  "targets": [
    {
      "targetId": "nist-sp-800-53r5",
      "label": "NIST SP 800-53 Rev. 5 (direct PDF)",
      "directPdfUrl": "https://nvlpubs.nist.gov/nistpubs/SpecialPublications/NIST.SP.800-53r5.pdf"
    }
  ],
  "monitorKey": "policy-pdf",
  "mode": "changesOnly",
  "baselineMode": "emitBaseline",
  "includeTextDiff": true,
  "maxPdfSizeMb": 25,
  "maxPagesPerPdf": 500
}
```

## Output

```json
{
  "targetId": {
    "label": "Target id",
    "format": "string"
  },
  "label": {
    "label": "Label",
    "format": "string"
  },
  "status": {
    "label": "Status",
    "format": "string"
  },
  "changeTypes": {
    "label": "Change types",
    "format": "array"
  },
  "previousPdfUrl": {
    "label": "Previous PDF",
    "format": "string"
  },
  "currentPdfUrl": {
    "label": "Current PDF",
    "format": "string"
  },
  "pageCount": {
    "label": "Page count",
    "format": "integer"
  },
  "previousPageCount": {
    "label": "Previous page count",
    "format": "integer"
  },
  "changedPages": {
    "label": "Changed pages",
    "format": "array"
  },
  "observedAt": {
    "label": "Observed at",
    "format": "string"
  }
}
```

## About this Actor

This example demonstrates how to use [PDF Change Monitor & Linked Document Tracker](https://apify.com/automa-flow/pdf-link-change-monitor.md) with a specific input configuration. Visit the [Actor detail page](https://apify.com/automa-flow/pdf-link-change-monitor.md) to learn more, explore other use cases, and run it yourself.


## How to integrate an Actor?

If asked about integration, you help developers integrate Actors into their projects.
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This Task's input is already configured above — use it as-is rather than inventing a new one.

- **AI agents and MCP clients** — the [Apify MCP server](https://docs.apify.com/integrations/mcp.md) at `https://mcp.apify.com` (remote, streamable HTTP, OAuth on first use).
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For full API examples (JavaScript, Python, CLI, MCP, OpenAPI), see this Task's Actor page: https://apify.com/automa-flow/pdf-link-change-monitor.md

For more details, see Apify documentation as [Markdown index](https://docs.apify.com/llms.txt) and [Markdown full-text](https://docs.apify.com/llms-full.txt).