create_chapter · BookStack MCP Server MCP: Risk & Policy

WHAT IT DOES

What create_chapter does on BookStack MCP Server

AI agents use create_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.

WHY IT NEEDS A POLICY

Why create_chapter needs a policy

This tool creates new content (a chapter) in a book, which is a write operation that modifies the wiki's data structure. The action is reversible (chapters can be deleted via sibling tool delete_chapter), so it does not rise to Destructive level. It has no financial implications and does not execute arbitrary code or delete data.

From the tool's definition The tool name is 'create_chapter' and the description states it will 'Create a new chapter in a book', indicating irreversible data creation within the BookStack wiki instance.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

create_chapter Rate-limited

create_chapter stays usable, but capped — an agent stuck in a loop can't make hundreds of changes a minute. Everything else on the server is denied unless you say otherwise.

View as policy code

policy.json

{
  "version": "1",
  "default": "deny",
  "tools": {
    "create_chapter": {
      "limits": [
        {
          "counter": "create_chapter_rate",
          "window": "minute",
          "max": 30,
          "scope": "grant"
        }
      ]
    }
  }
}

LIMIT THIS TOOL →

Instant setup, no code required.

PolicyLayer is an MCP gateway: every tool call is checked against your rule before it reaches BookStack MCP Server, so you can run agents against it safely.

FAQ

Questions about create_chapter

What does the create_chapter tool do? +

Create a new chapter in a book. It is categorised as a Write tool in the BookStack MCP Server MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.

How do I enforce a policy on create_chapter? +

Register the BookStack MCP Server MCP server in PolicyLayer and add a rule for create_chapter: allow, deny, rate-limit, or require approval. Point your MCP client at the PolicyLayer proxy URL and the rule is enforced on every call, before it reaches BookStack MCP Server. Nothing to install.

What risk level is create_chapter? +

create_chapter is a Write tool with medium risk. Write tools should be rate-limited to prevent accidental bulk modifications.

Can I rate-limit create_chapter? +

Yes. Add a rate_limit block to the create_chapter rule in your PolicyLayer policy. For example, setting max: 10 and window: 60 limits the tool to 10 calls per minute. Rate limits are tracked per agent session and reset automatically.

How do I block create_chapter completely? +

Set action: deny in the PolicyLayer policy for create_chapter. The AI agent will receive a policy violation error and cannot call the tool. You can also include a reason field to explain why the tool is blocked.

What MCP server provides create_chapter? +

create_chapter is provided by the BookStack MCP Server MCP server (lautarobarba/bookstack_mcp_server). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.