Compare two templates and show differences. Args: template_id1: First template ID template_id2: Second template ID user_id: Optional user ID (admin only) Returns: Template differences
AI agents call template_diff to retrieve information from Ludus FastMCP without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool retrieves and compares data (template metadata/configuration) between two templates without creating, modifying, deleting, or executing anything. It is a read-only operation that returns informational output. The optional user_id parameter is for access control, not for changing behavior into a write or execute operation.
From the tool's definition Tool name 'template_diff' and description 'Compare two templates and show differences' indicate a comparison/query operation with no modification or execution of templates or range environments.
Risk signalsAdmin/system-level operation
Documented attack patterns abuse exactly the kind of access template_diff 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 template_diff:
{
"version": "1",
"default": "deny",
"tools": {
"template_diff": {}
}
}template_diff is read-only, so it stays allowed — but everything else on the server is denied unless you say otherwise.
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Compare two templates and show differences. Args: template_id1: First template ID template_id2: Second template ID user_id: Optional user ID (admin only) Returns: Template differences. It is categorised as a Read tool in the Ludus FastMCP MCP Server, which means it retrieves data without modifying state.
Register the Ludus Fast MCP server in PolicyLayer and add a rule for template_diff: 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.
template_diff is a Read tool with low risk. Read-only tools are generally safe to allow by default.
Yes. Add a rate_limit block to the template_diff 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 template_diff. 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.
template_diff 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.
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201 Ludus FastMCP tools catalogued and risk-classified — across an index of 42,500+ MCP servers.