List filament spools with optional filters and sorting. Accounts often have hundreds of spools, so ALWAYS pair sort_by with a limit. Use sort_by=last_used + limit=10 for "most used / most popular spool" questions. Use sort_by=created + limit=N for recently added. Use sort_by=left for emptiest/ful...
Risk signalsHigh parameter count (10 properties)
Part of the SimplyPrint: 3D Print Farm Management server.
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AI agents call list_filaments to retrieve information from SimplyPrint: 3D Print Farm Management without modifying any data. This is common in research, monitoring, and reporting workflows where the agent needs context before taking action. Because read operations don't change state, they are generally safe to allow without restrictions -- but you may still want rate limits to control API costs.
Even though list_filaments only reads data, uncontrolled read access can leak sensitive information or rack up API costs. An agent caught in a retry loop could make thousands of calls per minute. A rate limit gives you a safety net without blocking legitimate use.
Read-only tools are safe to allow by default. No rate limit needed unless you want to control costs.
{
"version": "1",
"default": "deny",
"tools": {
"list_filaments": {}
}
}See the full SimplyPrint: 3D Print Farm Management policy for all 70 tools.
These attack patterns abuse exactly the kind of access list_filaments gives an agent. Each links to the full case and the policy that stops it:
Other read tools across the catalogue. The same approach applies to each: allow, with a rate cap to control cost.
List filament spools with optional filters and sorting. Accounts often have hundreds of spools, so ALWAYS pair sort_by with a limit. Use sort_by=last_used + limit=10 for "most used / most popular spool" questions. Use sort_by=created + limit=N for recently added. Use sort_by=left for emptiest/fullest. Filters (material_type/brand/color) are case-insensitive substring matches. If the user names a specific spool by id or 4-character short id (e.g. "T2SO"), call get_filament instead — do NOT list and grep.. It is categorised as a Read tool in the SimplyPrint: 3D Print Farm Management MCP Server, which means it retrieves data without modifying state.
Register the SimplyPrint: 3D Print Farm Management MCP server in PolicyLayer and add a rule for list_filaments: 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 SimplyPrint: 3D Print Farm Management. Nothing to install.
list_filaments 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 list_filaments 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 list_filaments. 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.
list_filaments is provided by the SimplyPrint: 3D Print Farm Management MCP server (https://simplyprint.io/api/mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Deterministic rules across all 70 SimplyPrint: 3D Print Farm Management tools. Per-identity grants. Full audit log. Live in minutes. Nothing to install.
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