create_faction · Narrarium MCP: Risk & Policy

WHAT IT DOES

What create_faction does on Narrarium

AI agents use create_faction 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 create_faction needs a policy

This tool creates new faction data structures within a book repository system. It is a Write-category tool because it creates new data artifacts (faction files) that are reversible—factions can be deleted, modified, or overwritten. There is no irreversible deletion (Destructive), no code execution (Execute), no financial impact (Financial), and it does not retrieve existing data without side effects (Read).

From the tool's definition Tool name 'create_faction' and description stating it 'Create[s] a rich faction file' with content fields (mission, ideology, methods, alliances, historical research). The verb 'create' indicates data generation/creation.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

create_faction Rate-limited

create_faction 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_faction": {
      "limits": [
        {
          "counter": "create_faction_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 create_faction

What does the create_faction tool do? +

Create a rich faction file with mission, ideology, methods, alliances, and optional historical research support. 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 create_faction? +

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

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

Can I rate-limit create_faction? +

Yes. Add a rate_limit block to the create_faction 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_faction completely? +

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

create_faction 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.