pki-revoke-issuer
AI agents call pki-revoke-issuer 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 issuer revocation is an irreversible operation that destroys or invalidates cryptographic infrastructure state. While the description is empty (lowering confidence slightly), the tool name clearly indicates a destructive action affecting core PKI infrastructure. This falls under Destructive rather than Execute because it specifically terminates/revokes an issuer rather than executing arbitrary operations.
From the tool's definition Tool name is 'pki-revoke-issuer' which performs a revocation action on a PKI issuer in HashiCorp Vault. The word 'revoke' indicates an irreversible operation that cannot be undone.
Attacks that exploit this kind of access
pki-revoke-issuer. 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-issuer: 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-issuer 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-issuer 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-issuer. 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-issuer 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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