This record as markdown: /tools/kiln/register-printer.md
What register_printer does on Kiln
AI agents use register_printer 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 register_printer is rated Medium
Registration typically creates or modifies a configuration entry for a device, making this a Write operation rather than Read (no query) or Destructive (reversible). Severity is medium because unauthorized registration could allow an agent to add rogue printers to a system, potentially enabling unauthorized manufacturing or resource hijacking, but the impact is constrained to device inventory rather than financial…
From the tool's definition Tool name 'register_printer' indicates creation or enrollment of a printer resource in the system. Description is empty, limiting certainty.
Attacks that exploit this kind of access
The rule that runs register_printer 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 register_printer, this is the rule to start with:
register_printer 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.
The button opens the PolicyLayer dashboard: create your workspace, connect Kiln, apply this rule, and every register_printer call is checked against it from then on.
Questions about register_printer
register_printer is a write tool on the Kiln MCP server. 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.
Register the Kiln MCP server in PolicyLayer and add a rule for register_printer: 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.
register_printer is a Write tool with medium risk. Write tools should be rate-limited to prevent accidental bulk modifications.
Yes. Add a rate_limit block to the register_printer 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 register_printer. 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.
register_printer 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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