# update_chapter

Update an existing chapter in BookStack.

Agent View of the PolicyLayer registry record for `update_chapter`. HTML page: https://policylayer.com/tools/derron-knox-bookstack-mcp-server/update-chapter

## Facts

- Tool: `update_chapter`
- Server: BookStack MCP Server (`derron-knox/bookstack-mcp-server`) — https://policylayer.com/tools/derron-knox-bookstack-mcp-server.md
- Homepage: https://github.com/Derron-Knox/bookstack-mcp-server
- Risk category: Write (Medium risk)
- Registry record: grade F, identity unverified
- Server rate-limited: no
- Parameters: 0
- Recommended policy verdict: Rate-limited

## Example call (MCP tools/call, JSON-RPC 2.0)

```json
{
  "jsonrpc": "2.0",
  "id": 1,
  "method": "tools/call",
  "params": {
    "name": "update_chapter",
    "arguments": {}
  }
}
```

## Why update_chapter is rated Medium

This tool modifies existing chapter content in a knowledge base system. While it changes data, the modification is reversible through subsequent updates or version control, placing it in the Write category rather than Destructive.

From the tool's own definition: "Tool name 'update_chapter' and description 'Update an existing chapter in BookStack' indicate modification of existing data."

## Use case

AI agents use update_chapter to create or update resources in BookStack MCP Server, usually the action step of a workflow, after the agent has gathered context. Every call changes real data in your BookStack MCP Server environment.

## Recommended policy (PolicyLayer)

Verdict: **Rate-limited**. Enforced by the PolicyLayer MCP gateway (https://policylayer.com/mcp-gateway) before a call reaches BookStack MCP Server:

```json
{
  "version": "1",
  "default": "deny",
  "tools": {
    "update_chapter": {
      "limits": [
        {
          "counter": "update_chapter_rate",
          "window": "minute",
          "max": 30,
          "scope": "grant"
        }
      ]
    }
  }
}
```

## Other tools on BookStack MCP Server (23)

- `delete_book` — Destructive — https://policylayer.com/tools/derron-knox-bookstack-mcp-server/delete-book.md
- `delete_chapter` — Destructive — https://policylayer.com/tools/derron-knox-bookstack-mcp-server/delete-chapter.md
- `delete_page` — Destructive — https://policylayer.com/tools/derron-knox-bookstack-mcp-server/delete-page.md
- `delete_shelf` — Destructive — https://policylayer.com/tools/derron-knox-bookstack-mcp-server/delete-shelf.md
- `export_chapter_html` — Read — https://policylayer.com/tools/derron-knox-bookstack-mcp-server/export-chapter-html.md
- `export_chapter_markdown` — Read — https://policylayer.com/tools/derron-knox-bookstack-mcp-server/export-chapter-markdown.md
- `export_chapter_pdf` — Read — https://policylayer.com/tools/derron-knox-bookstack-mcp-server/export-chapter-pdf.md
- `export_chapter_plaintext` — Read — https://policylayer.com/tools/derron-knox-bookstack-mcp-server/export-chapter-plaintext.md
- `get_page_content` — Read — https://policylayer.com/tools/derron-knox-bookstack-mcp-server/get-page-content.md
- `list_books` — Read — https://policylayer.com/tools/derron-knox-bookstack-mcp-server/list-books.md
- `list_chapters` — Read — https://policylayer.com/tools/derron-knox-bookstack-mcp-server/list-chapters.md
- `list_shelves` — Read — https://policylayer.com/tools/derron-knox-bookstack-mcp-server/list-shelves.md
- `read_book` — Read — https://policylayer.com/tools/derron-knox-bookstack-mcp-server/read-book.md
- `read_chapter` — Read — https://policylayer.com/tools/derron-knox-bookstack-mcp-server/read-chapter.md
- `read_shelf` — Read — https://policylayer.com/tools/derron-knox-bookstack-mcp-server/read-shelf.md
- `search_items` — Read — https://policylayer.com/tools/derron-knox-bookstack-mcp-server/search-items.md
- `create_book` — Write — https://policylayer.com/tools/derron-knox-bookstack-mcp-server/create-book.md
- `create_chapter` — Write — https://policylayer.com/tools/derron-knox-bookstack-mcp-server/create-chapter.md
- `create_page` — Write — https://policylayer.com/tools/derron-knox-bookstack-mcp-server/create-page.md
- `create_shelf` — Write — https://policylayer.com/tools/derron-knox-bookstack-mcp-server/create-shelf.md
- `update_book` — Write — https://policylayer.com/tools/derron-knox-bookstack-mcp-server/update-book.md
- `update_page` — Write — https://policylayer.com/tools/derron-knox-bookstack-mcp-server/update-page.md
- `update_shelf` — Write — https://policylayer.com/tools/derron-knox-bookstack-mcp-server/update-shelf.md

## For agents

This record is a snapshot. Live verdicts and the full registry:

- Check every server in your MCP config at once: `npx -y policylayer stack`
- Vet a server before you add it: install the mcp-precheck skill — `npx skills add https://policylayer.com` (skill text: https://policylayer.com/skill.md)
- Query the registry over MCP: endpoint `https://api.policylayer.com/mcp` — tools `check_mcp_server`, `check_mcp_stack`, `check_tool`, `search_registry`, `get_change_events`

---

Source: the PolicyLayer MCP registry — one continuously verified record per MCP server. Full record: https://policylayer.com/registry?q=derron-knox-bookstack-mcp-server · API: https://policylayer.com/registry/api · Policy library: https://policylayer.com/policies/derron-knox-bookstack-mcp-server