pki-list-certificates
AI agents call pki-list-certificates to retrieve information from Vault MCP Server (mschuchard) without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool retrieves/queries certificate data from Vault's PKI secret engine with no side effects. However, severity is elevated to 'high' rather than 'low' because certificates can reveal sensitive infrastructure details, PKI topology, and cryptographic material metadata that could inform attacks. An AI agent listing certificates could expose security-critical information.
From the tool's definition Tool name 'pki-list-certificates' and context within a Vault MCP server for managing PKI (Public Key Infrastructure) secret engines. The 'list' verb and naming convention align with Read operations.
Attacks that exploit this kind of access
pki-list-certificates. It is categorised as a Read tool in the Vault MCP Server (mschuchard) MCP Server, which means it retrieves data without modifying state.
Register the Vault MCP Server (mschuchard) MCP server in PolicyLayer and add a rule for pki-list-certificates: 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 Vault MCP Server (mschuchard). Nothing to install.
pki-list-certificates 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 pki-list-certificates 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 pki-list-certificates. 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.
pki-list-certificates is provided by the Vault MCP Server (mschuchard) MCP server (mschuchard/vault-mcp-server). 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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