sync_script_ledger · Narrarium MCP: Risk & Policy

WHAT IT DOES

What sync_script_ledger does on Narrarium

AI agents use sync_script_ledger 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 sync_script_ledger needs a policy

This tool regenerates a ledger file from source scripts, which is a Write operation—it creates or modifies data (the ledger markdown file) in a reversible manner. While it processes sensitive information (secret maps, variable timelines, continuity directives), the operation itself is not destructive (the ledger can be regenerated or restored).

From the tool's definition Tool description states it will "Regenerate state/script-ledger.md" which indicates the tool creates or modifies a file. The tool processes script files and outputs a consolidated ledger document.

Risk signalsBulk/mass operation — affects multiple targets

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

sync_script_ledger Rate-limited

sync_script_ledger 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": {
    "sync_script_ledger": {
      "limits": [
        {
          "counter": "sync_script_ledger_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 sync_script_ledger

What does the sync_script_ledger tool do? +

Regenerate state/script-ledger.md deterministically from every script file, including secret maps, variable timelines, continuity directives, and parser/prose checks. 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 sync_script_ledger? +

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

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

Can I rate-limit sync_script_ledger? +

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

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

sync_script_ledger 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.