pki-revoke-certificate
AI agents call pki-revoke-certificate to permanently remove resources in Vault MCP Server (mschuchard) — typically in cleanup and lifecycle workflows. It does its job in a single call, and there is no undo.
PKI certificate revocation is inherently destructive because it permanently marks a certificate as invalid across all relying parties, blocking its use for authentication, encryption, or other cryptographic purposes. This action cannot be reversed and impacts downstream systems depending on that certificate.
From the tool's definition Tool name 'pki-revoke-certificate' directly indicates irreversible revocation of PKI certificates. Revocation is a one-way operation that cannot be undone—once a certificate is revoked, it cannot be un-revoked without administrative intervention.
Attacks that exploit this kind of access
pki-revoke-certificate. It is categorised as a Destructive tool in the Vault MCP Server (mschuchard) MCP Server, which means it can permanently delete or destroy data. Block by default and require explicit approval.
Register the Vault MCP Server (mschuchard) MCP server in PolicyLayer and add a rule for pki-revoke-certificate: 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-revoke-certificate is a Destructive tool with critical risk. Critical-risk tools should be blocked by default and only enabled with explicit human approval.
Yes. Add a rate_limit block to the pki-revoke-certificate 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-revoke-certificate. 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-revoke-certificate 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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