Set user's default range. Args: range_id: Range ID to set as default Returns: Result of setting default range
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.
This tool modifies user preference data (sets a default range) in a reversible manner. It is not destructive (the preference can be changed), not executable code, and has minimal blast radius as it only affects user UI/workflow defaults without impacting actual range infrastructure or data. Classified as Write with low severity due to the limited scope and reversibility of the change.
From the tool's definition Tool name 'set_default_range' and description 'Set user's default range' indicate a modification operation that persists a user preference. The operation 'set' is a write action that updates user configuration data.
Documented attack patterns abuse exactly the kind of access set_default_range gives an agent:
PolicyLayer is an MCP gateway — it sits between your AI agents and Ludus FastMCP, and nothing reaches the server without passing your rules. This is the rule we recommend for set_default_range:
{
"version": "1",
"default": "deny",
"tools": {
"set_default_range": {
"limits": [
{
"counter": "set_default_range_rate",
"window": "minute",
"max": 30,
"scope": "grant"
}
]
}
}
}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.
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Set user's default range. Args: range_id: Range ID to set as default Returns: Result of setting 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.
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.
set_default_range is a Write tool with medium risk. Write tools should be rate-limited to prevent accidental bulk modifications.
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.
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.
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.
Deterministic rules across all 201 Ludus FastMCP tools. Per-identity grants. Full audit log. Live in minutes. Nothing to install.
Free to start. No card required.
201 Ludus FastMCP tools catalogued and risk-classified — across an index of 42,500+ MCP servers.