promote_book_item · Narrarium MCP: Risk & Policy

WHAT IT DOES

What promote_book_item does on Narrarium

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

WHY IT NEEDS A POLICY

Why promote_book_item needs a policy

The tool modifies and reorganizes existing items within a book repository system by changing their status and location (move to notes, move to story design, or archive). These are Write operations because they create or modify data reversibly—items can be moved again or recovered from archive.

From the tool's definition Tool performs state-change operations on book repository items: 'move it into notes or story design, or archive it as promoted'. These are reversible modifications to metadata and organizational structure.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

promote_book_item Rate-limited

promote_book_item 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": {
    "promote_book_item": {
      "limits": [
        {
          "counter": "promote_book_item_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 Narrarium, so you can run agents against it safely.

FAQ

Questions about promote_book_item

What does the promote_book_item tool do? +

Promote a structured book-level idea or note out of the active queue. You can move it into notes or story design, or archive it as promoted after you already used it in a draft. It is categorised as a Write tool in the Narrarium MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.

How do I enforce a policy on promote_book_item? +

Register the Narrarium MCP server in PolicyLayer and add a rule for promote_book_item: 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 Narrarium. Nothing to install.

What risk level is promote_book_item? +

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

Can I rate-limit promote_book_item? +

Yes. Add a rate_limit block to the promote_book_item 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 promote_book_item completely? +

Set action: deny in the PolicyLayer policy for promote_book_item. 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 promote_book_item? +

promote_book_item is provided by the Narrarium MCP server (narrarium-mcp-server). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.