create_secret · Narrarium MCP: Risk & Policy

WHAT IT DOES

What create_secret does on Narrarium

AI agents use create_secret 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_secret needs a policy

This tool creates new narrative/story data (a secret file for book authoring) within a local repository. It is a reversible write operation—secrets can be modified, deleted, or overwritten. There are no destructive (irreversible), execute (code-running), or financial implications.

From the tool's definition Tool name 'create_secret' and description 'Create a rich secret file' indicates it creates new data structures within the Narrarium book repository system.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

create_secret Rate-limited

create_secret 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_secret": {
      "limits": [
        {
          "counter": "create_secret_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_secret

What does the create_secret tool do? +

Create a rich secret file with stakes, holders, protection, reveal strategy, and spoiler thresholds. 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_secret? +

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

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

Can I rate-limit create_secret? +

Yes. Add a rate_limit block to the create_secret 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_secret completely? +

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

create_secret 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.