create_dataset · Langfuse MCP Server MCP: Risk & Policy

WHAT IT DOES

What create_dataset does on Langfuse MCP Server

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

WHY IT NEEDS A POLICY

Why create_dataset needs a policy

This tool creates a new dataset, which is a Write operation—it modifies system state by adding new persistent data. The severity is medium rather than high because dataset creation is typically reversible (datasets can be deleted) and does not directly expose sensitive analytics or cost data. However, it could be misused to pollute the analytics system or consume storage resources.

From the tool's definition Tool name 'create_dataset' and description 'Create a new dataset for organizing test data and examples' indicate irreversible creation of a new data structure.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

create_dataset Rate-limited

create_dataset 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": {
    "create_dataset": {
      "limits": [
        {
          "counter": "create_dataset_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 Server, so you can run agents against it safely.

FAQ

Questions about create_dataset

What does the create_dataset tool do? +

Create a new dataset for organizing test data and examples. It is categorised as a Write tool in the Langfuse 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 create_dataset? +

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

What risk level is create_dataset? +

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

Can I rate-limit create_dataset? +

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

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

create_dataset is provided by the Langfuse MCP Server MCP server (therealsachin/langfuse-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.