refresh_datasource · Tableau MCP Server MCP: Risk & Policy

WHAT IT DOES

What refresh_datasource does on Tableau MCP Server

AI agents invoke refresh_datasource to trigger actions in Tableau MCP Server. What it does depends on the arguments the agent supplies, and its effects often reach beyond the immediate call — builds kicked off, notifications sent, workflows started.

WHY IT NEEDS A POLICY

Why refresh_datasource needs a policy

This tool executes a data refresh operation on a Tableau datasource. While not destructive (the datasource itself is not deleted), it triggers an external computational process that can have side effects: it may fail, consume resources, overwrite extracted data, or impact dependent workbooks. The operation is asynchronous and its completion state is non-deterministic.

From the tool's definition Tool description: 'Trigger an extract refresh on a data source.' The verb 'trigger' and 'refresh' indicate execution of an external operation (Tableau's data refresh pipeline) whose effects depend on the datasource argument and whose outcome is not…

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

refresh_datasource Rate-limited

refresh_datasource stays usable, but rate-capped — a runaway agent can't fire it dozens of times a minute. Everything else on the server is denied unless you say otherwise.

View as policy code

policy.json

{
  "version": "1",
  "default": "deny",
  "tools": {
    "refresh_datasource": {
      "limits": [
        {
          "counter": "refresh_datasource_rate",
          "window": "minute",
          "max": 10,
          "scope": "grant"
        }
      ]
    }
  }
}

RATE-LIMIT THIS TOOL →

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PolicyLayer is an MCP gateway: every tool call is checked against your rule before it reaches Tableau MCP Server, so you can run agents against it safely.

FAQ

Questions about refresh_datasource

What does the refresh_datasource tool do? +

Trigger an extract refresh on a data source. It is categorised as a Execute tool in the Tableau MCP Server MCP Server, which means it can trigger actions or run processes. Use rate limits and argument validation.

How do I enforce a policy on refresh_datasource? +

Register the Tableau MCP Server MCP server in PolicyLayer and add a rule for refresh_datasource: 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 Tableau MCP Server. Nothing to install.

What risk level is refresh_datasource? +

refresh_datasource is a Execute tool with high risk. Execute tools should be rate-limited and have argument validation enabled.

Can I rate-limit refresh_datasource? +

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

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

refresh_datasource is provided by the Tableau MCP Server MCP server (lokimcpuniverse/tableau-mcp-server). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.