axle_verify_proof · Axle MCP: Risk & Policy

WHAT IT DOES

What axle_verify_proof does on Axle

AI agents invoke axle_verify_proof to trigger actions in Axle. 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 axle_verify_proof needs a policy

Based on the tool name and server context, this tool likely verifies/validates a Lean 4 proof by sending it to a remote API for checking. This constitutes an Execute-level action (running a proof check via external API call). Since the description is empty, confidence is reduced. Severity is medium given it triggers remote execution but likely has limited blast radius beyond API usage costs.

From the tool's definition Tool name 'axle_verify_proof' and server context: 'validate, repair, and transform Lean theorems through a remote API'. Description is empty.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

axle_verify_proof Rate-limited

axle_verify_proof 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": {
    "axle_verify_proof": {
      "limits": [
        {
          "counter": "axle_verify_proof_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 Axle, so you can run agents against it safely.

FAQ

Questions about axle_verify_proof

What does the axle_verify_proof tool do? +

axle_verify_proof. It is categorised as a Execute tool in the Axle MCP Server, which means it can trigger actions or run processes. Use rate limits and argument validation.

How do I enforce a policy on axle_verify_proof? +

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

What risk level is axle_verify_proof? +

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

Can I rate-limit axle_verify_proof? +

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

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

axle_verify_proof is provided by the Axle MCP server (vilin97/axle-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.