list_materials

List built-in filament material profiles (density, cost, temps).

SERVERKiln SOURCEcodeofaxel/Kiln

Low RISK CLASS

Category Read

Parameters 00 required

Recommended Allowedsee the rule below

Registry record Grade F, identity unverified Pull the record →

This record as markdown: /tools/kiln/list-materials.md

WHAT IT DOES

What list_materials does on Kiln

AI agents call list_materials to retrieve information from Kiln without modifying anything. It is typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.

RISK

Why list_materials is rated Low

The tool retrieves and queries existing material profile data without modifying, creating, or deleting any information. It has no capability to change printer state or perform physical operations. In the context of 3D printer control, listing material profiles is informational only and presents minimal security risk even if accessed by an untrusted agent.

From the tool's definition Tool description states 'List built-in filament material profiles (density, cost, temps)' — a pure data retrieval operation with no side effects.

Attacks that exploit this kind of access

RECOMMENDED RULE

The rule that runs list_materials safely

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

list_materials Allowed

list_materials is read-only, so it stays allowed. Everything else on the server is denied unless you say otherwise.

View as policy code

policy.json

{
  "version": "1",
  "default": "deny",
  "tools": {
    "list_materials": {}
  }
}

ALLOW ONLY THIS TOOL → Instant setup, no code required.

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

FAQ

Questions about list_materials

What does the list_materials tool do? +

List built-in filament material profiles (density, cost, temps). It is categorised as a Read tool in the Kiln MCP Server, which means it retrieves data without modifying state.

How do I enforce a policy on list_materials? +

Register the Kiln MCP server in PolicyLayer and add a rule for list_materials: 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 Kiln. Nothing to install.

What risk level is list_materials? +

list_materials is a Read tool with low risk. Read-only tools are generally safe to allow by default.

Can I rate-limit list_materials? +

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

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

list_materials is provided by the Kiln MCP server (codeofaxel/Kiln). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

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