pki-sign-certificate · Vault MCP Server (mschuchard) MCP

WHAT IT DOES

What pki-sign-certificate does on Vault MCP Server (mschuchard)

AI agents invoke pki-sign-certificate to trigger actions in Vault MCP Server (mschuchard). What it does depends on the arguments the agent supplies, and its effects often reach beyond the immediate call — builds kicked off, notifications sent, workflows started.

WHY IT NEEDS A POLICY

Why pki-sign-certificate needs a policy

PKI certificate signing is an Execute-level operation: it triggers an external cryptographic operation in Vault's PKI engine, issuing a signed certificate against a CA. Misuse could lead to unauthorized certificate issuance, enabling impersonation or MITM attacks. Severity is high due to the security implications of certificate issuance.

From the tool's definition Tool name 'pki-sign-certificate' on a Vault MCP server managing PKI secret engines. Description is empty.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

pki-sign-certificate Rate-limited

pki-sign-certificate stays usable, but rate-capped — a runaway agent can't fire it dozens of times a minute. Everything else on the server is denied unless you say otherwise.

View as policy code

policy.json

{
  "version": "1",
  "default": "deny",
  "tools": {
    "pki-sign-certificate": {
      "limits": [
        {
          "counter": "pki-sign-certificate_rate",
          "window": "minute",
          "max": 10,
          "scope": "grant"
        }
      ]
    }
  }
}

RATE-LIMIT THIS TOOL →

Instant setup, no code required.

PolicyLayer is an MCP gateway: every tool call is checked against your rule before it reaches Vault MCP Server (mschuchard), so you can run agents against it safely.

FAQ

Questions about pki-sign-certificate

What does the pki-sign-certificate tool do? +

pki-sign-certificate. It is categorised as a Execute tool in the Vault MCP Server (mschuchard) MCP Server, which means it can trigger actions or run processes. Use rate limits and argument validation.

How do I enforce a policy on pki-sign-certificate? +

Register the Vault MCP Server (mschuchard) MCP server in PolicyLayer and add a rule for pki-sign-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.

What risk level is pki-sign-certificate? +

pki-sign-certificate is a Execute tool with high risk. Execute tools should be rate-limited and have argument validation enabled.

Can I rate-limit pki-sign-certificate? +

Yes. Add a rate_limit block to the pki-sign-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.

How do I block pki-sign-certificate completely? +

Set action: deny in the PolicyLayer policy for pki-sign-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.

What MCP server provides pki-sign-certificate? +

pki-sign-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.