Extract a parsed ASN.1 node and its subtree by node id as DER bytes.
AI agents call extract_asn1_node to retrieve information from PKI Studio MCP without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool retrieves and exports existing ASN.1 node data in a standard format (DER bytes). There are no side effects, data modification, deletion, or external operations triggered. It is purely a data retrieval function. The low severity reflects that extracting certificate/key metadata has minimal blast radius even if misused—no destructive, financial, or system-level impacts are possible.
From the tool's definition Tool description states 'Extract a parsed ASN.1 node' - extraction is a read operation with no modification of underlying data. Returns DER bytes representation of existing parsed structures.
Attacks that exploit this kind of access
Extract a parsed ASN.1 node and its subtree by node id as DER bytes. It is categorised as a Read tool in the PKI Studio MCP MCP Server, which means it retrieves data without modifying state.
Register the PKI Studio MCP server in PolicyLayer and add a rule for extract_asn1_node: 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.
extract_asn1_node is a Read tool with low risk. Read-only tools are generally safe to allow by default.
Yes. Add a rate_limit block to the extract_asn1_node 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 extract_asn1_node. 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.
extract_asn1_node 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.
Every MCP server has a record like this.
Type a name, get the same breakdown: verified identity, auth posture, risk grade, capabilities, recommended policy.
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