create_asn1_instance · PKI Studio MCP: Risk & Policy

WHAT IT DOES

What create_asn1_instance does on PKI Studio MCP

AI agents use create_asn1_instance to create or update resources in PKI Studio MCP — usually the action step of a workflow, after the agent has gathered context. Every call changes real data in your PKI Studio MCP environment.

WHY IT NEEDS A POLICY

Why create_asn1_instance needs a policy

This is a Write operation because it constructs (creates) new cryptographic data structures (DER-encoded ASN.1 objects) from JSON specifications. While the operation itself is reversible and doesn't delete data, it generates new artifacts that could be misused to create malicious certificates or cryptographic objects if an AI agent is compromised or manipulated.

From the tool's definition The tool 'create_asn1_instance' builds or creates DER bytes from JSON input, which is a data generation and encoding operation. The verbs 'build' and 'create' indicate data creation/modification rather than retrieval.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

create_asn1_instance Rate-limited

create_asn1_instance 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": {
    "create_asn1_instance": {
      "limits": [
        {
          "counter": "create_asn1_instance_rate",
          "window": "minute",
          "max": 30,
          "scope": "grant"
        }
      ]
    }
  }
}

LIMIT THIS TOOL →

Instant setup, no code required.

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

FAQ

Questions about create_asn1_instance

What does the create_asn1_instance tool do? +

Build DER bytes from JSON instance input and a selected type in a supported ASN.1 definition subset or Schema Model JSON. It is categorised as a Write tool in the PKI Studio MCP MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.

How do I enforce a policy on create_asn1_instance? +

Register the PKI Studio MCP server in PolicyLayer and add a rule for create_asn1_instance: 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 PKI Studio MCP. Nothing to install.

What risk level is create_asn1_instance? +

create_asn1_instance is a Write tool with medium risk. Write tools should be rate-limited to prevent accidental bulk modifications.

Can I rate-limit create_asn1_instance? +

Yes. Add a rate_limit block to the create_asn1_instance 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 create_asn1_instance completely? +

Set action: deny in the PolicyLayer policy for create_asn1_instance. 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 create_asn1_instance? +

create_asn1_instance is provided by the PKI Studio MCP server (pkistudio/pkistudiomcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.