issue_preview_token · Kiln MCP: Risk & Policy

WHAT IT DOES

What issue_preview_token does on Kiln

AI agents use issue_preview_token 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.

WHY IT NEEDS A POLICY

Why issue_preview_token needs a policy

Token issuance is a write operation that creates new authentication credentials. In a 3D printer control context, preview tokens likely grant temporary access to printer resources or features. While not destructive or financial, misuse could allow an agent to create tokens for unauthorized access or escalate privileges, justifying medium severity.

From the tool's definition Tool name 'issue_preview_token' suggests creation or generation of an authentication/authorization token. The empty description limits precision, but 'issue' typically means to create or generate (e.g., 'issue a certificate', 'issue a token').

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

issue_preview_token Rate-limited

issue_preview_token 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": {
    "issue_preview_token": {
      "limits": [
        {
          "counter": "issue_preview_token_rate",
          "window": "minute",
          "max": 30,
          "scope": "grant"
        }
      ]
    }
  }
}

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Instant setup, no code required.

PolicyLayer is an MCP gateway: every tool call is checked against your rule before it reaches Kiln, so you can run agents against it safely.

FAQ

Questions about issue_preview_token

What does the issue_preview_token tool do? +

issue_preview_token. 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 issue_preview_token? +

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

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

Can I rate-limit issue_preview_token? +

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

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

issue_preview_token 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.