jamovi_save · jamovi MCP: Risk & Policy

WHAT IT DOES

What jamovi_save does on jamovi MCP

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

WHY IT NEEDS A POLICY

Why jamovi_save needs a policy

The tool creates or updates a file on disk (the .omv dataset file). While this is persistent and could overwrite an existing file, it is not irreversible in the destructive sense—the original in-memory dataset state remains, backups may exist, and the file can be deleted or replaced. It modifies data state reversibly relative to the primary dataset. This is a classic Write operation.

From the tool's definition Tool is described as "Save the current dataset to a file (.omv format)." This operation creates or persists data in a new file location, modifying the filesystem state.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

jamovi_save Rate-limited

jamovi_save 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": {
    "jamovi_save": {
      "limits": [
        {
          "counter": "jamovi_save_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 jamovi MCP, so you can run agents against it safely.

FAQ

Questions about jamovi_save

What does the jamovi_save tool do? +

Save the current dataset to a file (.omv format). It is categorised as a Write tool in the jamovi MCP MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.

How do I enforce a policy on jamovi_save? +

Register the jamovi MCP server in PolicyLayer and add a rule for jamovi_save: 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 jamovi MCP. Nothing to install.

What risk level is jamovi_save? +

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

Can I rate-limit jamovi_save? +

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

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

jamovi_save is provided by the jamovi MCP server (yjm110517/jamovi-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.