proxy_get_ca_cert

THE RISK

Low Risk

Why proxy_get_ca_cert needs a policy

This tool retrieves and returns existing certificate data (PEM format and fingerprint) for installation purposes. It performs a read-only operation with no side effects, no code execution, and no data modification. The certificate itself is informational infrastructure data.

From the tool's definition Tool name 'proxy_get_ca_cert' and description 'Get the CA certificate PEM and SPKI fingerprint' indicate retrieval of cryptographic certificate data without modification or execution.

Documented attack patterns abuse exactly the kind of access proxy_get_ca_cert gives an agent:

POLICY

How to control proxy_get_ca_cert

PolicyLayer is an MCP gateway — it sits between your AI agents and Proxy, and nothing reaches the server without passing your rules. This is the rule we recommend for proxy_get_ca_cert:

policy.json

{
  "version": "1",
  "default": "deny",
  "tools": {
    "proxy_get_ca_cert": {}
  }
}

proxy_get_ca_cert is read-only, so it stays allowed — but everything else on the server is denied unless you say otherwise.

Create a free account and register Proxy — nothing to install.
Add this policy — paste it, or build it visually.
Point your MCP client (Claude, Cursor, anything) at your gateway URL.

CAP THIS TOOL →

Free to start. No card required.

EXPLORE

Related tools and policies

More Proxy tools

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All 89 Proxy tools →

Read tools on other servers

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Go deeper

The MCP Attack Database → Documented attack patterns against MCP deployments — and the policies that stop them.
Data exfiltration → How read access becomes an exfiltration channel when chained with untrusted content.
MCP token cost → What connecting this server costs in context-window tokens on every request.
Rate Limiting MCP Tool Calls: A Practical Guide →
MCP Security: Why Prompt Guardrails Aren't Enough →

FAQ

Questions about proxy_get_ca_cert

What does the proxy_get_ca_cert tool do? +

Get the CA certificate PEM and SPKI fingerprint for installing on the target device. It is categorised as a Read tool in the Proxy MCP Server, which means it retrieves data without modifying state.

How do I enforce a policy on proxy_get_ca_cert? +

Register the Proxy MCP server in PolicyLayer and add a rule for proxy_get_ca_cert: 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 Proxy. Nothing to install.

What risk level is proxy_get_ca_cert? +

proxy_get_ca_cert is a Read tool with low risk. Read-only tools are generally safe to allow by default.

Can I rate-limit proxy_get_ca_cert? +

Yes. Add a rate_limit block to the proxy_get_ca_cert 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 proxy_get_ca_cert completely? +

Set action: deny in the PolicyLayer policy for proxy_get_ca_cert. 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 proxy_get_ca_cert? +

proxy_get_ca_cert is provided by the Proxy MCP server (yfe404/proxy-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

Enforce policy on every Proxy tool call.

Start from Proxy, add the rest of your stack, and see everything your agents can call. Then put policy on all of it.

CHECK YOUR STACK →