gemini_informal_prover

THE RISK

Low Risk

Why gemini_informal_prover needs a policy

The description is empty, so there is minimal information to classify this tool. Based on the name and the server context (Lean theorem prover via LSP), it likely generates informal proofs using a Gemini model, which would be a Read/Execute-like operation. However, given the pattern of sibling tools like 'gpt_informal_prover', it likely produces proof suggestions without direct side effects.

From the tool's definition Tool name is 'gemini_informal_prover'; description is empty or uninformative.

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

POLICY

How to control gemini_informal_prover

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

policy.json

{
  "version": "1",
  "default": "deny",
  "tools": {
    "gemini_informal_prover": {
      "limits": [
        {
          "counter": "gemini_informal_prover_rate",
          "window": "minute",
          "max": 60,
          "scope": "grant"
        }
      ]
    }
  }
}

gemini_informal_prover gets a rate cap, and everything else on the server is denied unless you say otherwise.

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

SET A RULE FOR THIS TOOL →

Free to start. No card required.

EXPLORE

Related tools and policies

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Go deeper

The MCP Attack Database → Documented attack patterns against MCP deployments — and the policies that stop them.
Tool risk categories → How PolicyLayer classifies MCP tools by what they can do.
MCP tool → What an MCP tool is and how clients discover and call it.
Rate Limiting MCP Tool Calls: A Practical Guide →
MCP Security: Why Prompt Guardrails Aren't Enough →

FAQ

Questions about gemini_informal_prover

What does the gemini_informal_prover tool do? +

gemini_informal_prover. It is categorised as a Other tool in the Lean Lsp MCP Server, which means it performs auxiliary operations.

How do I enforce a policy on gemini_informal_prover? +

Register the Lean Lsp MCP server in PolicyLayer and add a rule for gemini_informal_prover: 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 Lean Lsp. Nothing to install.

What risk level is gemini_informal_prover? +

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

Can I rate-limit gemini_informal_prover? +

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

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

gemini_informal_prover is provided by the Lean Lsp MCP server (project-numina/lean-lsp-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

Enforce policy on every Lean Lsp tool call.

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

CHECK YOUR STACK →