upsert_location · RPG Ledger MCP Server MCP: Risk & Policy

WHAT IT DOES

What upsert_location does on RPG Ledger MCP Server

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

WHY IT NEEDS A POLICY

Why upsert_location needs a policy

Upsert (update/insert) operations create or modify data reversibly—they do not delete or destroy data, making this Write rather than Destructive. The empty description lowers confidence slightly, but the tool name itself and server context (RPG campaign state management) clearly indicate a write-class mutation.

From the tool's definition Tool name 'upsert_location' indicates an update-or-insert operation on location data. Sibling tools include 'create_campaign', 'create_character', and 'delete_location', confirming this server manages mutable game state.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

upsert_location Rate-limited

upsert_location 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": {
    "upsert_location": {
      "limits": [
        {
          "counter": "upsert_location_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 RPG Ledger MCP Server, so you can run agents against it safely.

FAQ

Questions about upsert_location

What does the upsert_location tool do? +

upsert_location. It is categorised as a Write tool in the RPG Ledger MCP Server MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.

How do I enforce a policy on upsert_location? +

Register the RPG Ledger MCP Server MCP server in PolicyLayer and add a rule for upsert_location: 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 RPG Ledger MCP Server. Nothing to install.

What risk level is upsert_location? +

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

Can I rate-limit upsert_location? +

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

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

upsert_location is provided by the RPG Ledger MCP Server MCP server (sepa79/rpg-ledger-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.