createDataset · Langfuse Mcp Extended MCP: Risk & Policy

WHAT IT DOES

What createDataset does on Langfuse Mcp Extended

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

WHY IT NEEDS A POLICY

Why createDataset needs a policy

This tool creates new datasets, which is a write operation that modifies state by adding records to the Langfuse system. It is reversible (datasets can be deleted via deleteDataset or similar operations on the sibling tool list), so it does not meet the threshold for Destructive.

From the tool's definition Tool name 'createDataset' with description 'Create a new dataset' indicates data creation. The description specifies 'Create a new dataset for evaluation' which is a reversible write operation.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

createDataset Rate-limited

createDataset 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": {
    "createDataset": {
      "limits": [
        {
          "counter": "createdataset_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 Langfuse Mcp Extended, so you can run agents against it safely.

FAQ

Questions about createDataset

What does the createDataset tool do? +

Create a new dataset for evaluation. Datasets contain items with expected inputs/outputs for testing LLM applications. It is categorised as a Write tool in the Langfuse Mcp Extended MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.

How do I enforce a policy on createDataset? +

Register the Langfuse Mcp Extended MCP server in PolicyLayer and add a rule for createDataset: 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 Langfuse Mcp Extended. Nothing to install.

What risk level is createDataset? +

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

Can I rate-limit createDataset? +

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

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

createDataset is provided by the Langfuse Mcp Extended MCP server (langfuse-mcp-extended). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.