set_default_range

Set user's default range.

SERVERLudus FastMCP SOURCEtjnull/ludus-fastmcp

Medium RISK CLASS

Category Write

Parameters 00 required

Recommended Rate-limitedsee the rule below

Registry record Grade F, identity unverified Pull the record →

This record as markdown: /tools/tjnull-ludus-fastmcp/set-default-range.md

WHAT IT DOES

What set_default_range does on Ludus FastMCP

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

RISK

Why set_default_range is rated Medium

This tool creates or updates a user preference (the default range) without deleting data or executing external operations. It is a straightforward preference write operation. The blast radius is minimal since changing a default preference does not affect security posture, data integrity, or system operations—it only changes which range the user sees by default. This is a low-severity write operation.

From the tool's definition "Set user's default range" modifies a user preference setting, which is a reversible configuration change.

Attacks that exploit this kind of access

RECOMMENDED RULE

The rule that runs set_default_range safely

PolicyLayer is an MCP gateway: it sits between your AI agents and Ludus FastMCP, and checks every tool call against a rule you set before the call runs. Nothing changes on the server itself. For set_default_range, this is the rule to start with:

set_default_range Rate-limited

set_default_range 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": {
    "set_default_range": {
      "limits": [
        {
          "counter": "set_default_range_rate",
          "window": "minute",
          "max": 30,
          "scope": "grant"
        }
      ]
    }
  }
}

LIMIT THIS TOOL → Instant setup, no code required.

The button opens the PolicyLayer dashboard: create your workspace, connect Ludus FastMCP, apply this rule, and every set_default_range call is checked against it from then on.

FAQ

Questions about set_default_range

What does the set_default_range tool do? +

Set user's default range. It is categorised as a Write tool in the Ludus FastMCP MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.

How do I enforce a policy on set_default_range? +

Register the Ludus Fast MCP server in PolicyLayer and add a rule for set_default_range: 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 Ludus FastMCP. Nothing to install.

What risk level is set_default_range? +

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

Can I rate-limit set_default_range? +

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

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

set_default_range is provided by the Ludus Fast MCP server (tjnull/ludus-fastmcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

KEEP EXPLORING

More on Ludus Fast, and thousands of servers like it.

This server

All 231 Ludus Fast tools →

Across the catalogue

emit_assumption_set on 0sec →set-prioity on Kanban MCP Server →team_manager_set_sources on Team Manager MCP → The MCP Attack Database →

Guides

Govern customer-ops agents →Argument validation →Scoped token →