add_spool

Add a new filament spool to inventory.

SERVERKiln SOURCEcodeofaxel/Kiln

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/kiln/add-spool.md

WHAT IT DOES

What add_spool does on Kiln

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

RISK

Why add_spool is rated Medium

This tool creates or modifies inventory data in a reversible manner. Adding a spool is a write operation that creates new data. Severity is low because misuse would only add spurious inventory entries, with minimal blast radius and no financial, destructive, or execution consequences. Confidence is high because the intent is explicit in both name and description.

From the tool's definition Tool name 'add_spool' and description 'Add a new filament spool to inventory' indicate creation of a new inventory record without deletion or destructive operations.

Attacks that exploit this kind of access

RECOMMENDED RULE

The rule that runs add_spool 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 add_spool, this is the rule to start with:

add_spool Rate-limited

add_spool 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": {
    "add_spool": {
      "limits": [
        {
          "counter": "add_spool_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 Kiln, apply this rule, and every add_spool call is checked against it from then on.

FAQ

Questions about add_spool

What does the add_spool tool do? +

Add a new filament spool to inventory. It is categorised as a Write tool in the Kiln MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.

How do I enforce a policy on add_spool? +

Register the Kiln MCP server in PolicyLayer and add a rule for add_spool: 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 add_spool? +

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

Can I rate-limit add_spool? +

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

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

add_spool 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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