init_book_repo · Narrarium MCP: Risk & Policy

WHAT IT DOES

What init_book_repo does on Narrarium

AI agents use init_book_repo 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 init_book_repo needs a policy

This tool creates and initializes new files and folder structures in the local filesystem as part of setting up a book project repository. This is a reversible Write operation: while it creates files and directories, these can be deleted or modified afterward, and the action does not irreversibly destroy data or execute arbitrary code.

From the tool's definition The tool description states it will 'Create the local Narrarium repository structure' including 'folders, guidelines, summaries, evaluations, and reusable skills.' The verb 'Create' and the action of setting up directory structures and initializing project…

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

init_book_repo Rate-limited

init_book_repo 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": {
    "init_book_repo": {
      "limits": [
        {
          "counter": "init_book_repo_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 init_book_repo

What does the init_book_repo tool do? +

Create the local Narrarium repository structure for a book project, including folders, guidelines, summaries, evaluations, and reusable skills. 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 init_book_repo? +

Register the Narrarium MCP server in PolicyLayer and add a rule for init_book_repo: 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 init_book_repo? +

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

Can I rate-limit init_book_repo? +

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

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

init_book_repo 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.