upgrade_proxy

THE RISK

High Risk

Upgrading a proxy contract changes the implementation that all future calls will be routed to, effectively replacing the entire logic of a smart contract. This is an Execute-level action with critical severity because a misconfigured or malicious implementation address could drain funds, corrupt state, or permanently compromise the contract's behavior for all users.

From the tool's definition Upgrade a proxy contract to a new implementation address

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

HOW TO CONTROL UPGRADE_PROXY

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

policy.json

{
  "version": "1",
  "default": "deny",
  "tools": {
    "upgrade_proxy": {
      "limits": [
        {
          "counter": "upgrade_proxy_rate",
          "window": "minute",
          "max": 10,
          "scope": "grant"
        }
      ]
    }
  }
}

upgrade_proxy 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.

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

RATE-LIMIT THIS TOOL →

Free to start. No card required.

EXPLORE

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Go deeper

High-risk tools in BNB Chain MCP → Every high-risk tool this server exposes, in one view.
All high-risk MCP tools → Every high-risk tool across the catalogue, and the policy pattern that contains them.
The MCP Attack Database → Documented attack patterns against MCP deployments — and the policies that stop them.
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FAQ

What does the upgrade_proxy tool do? +

Upgrade a proxy contract to a new implementation address. It is categorised as a Execute tool in the BNB Chain MCP MCP Server, which means it can trigger actions or run processes. Use rate limits and argument validation.

How do I enforce a policy on upgrade_proxy? +

Register the BNB Chain MCP server in PolicyLayer and add a rule for upgrade_proxy: 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 BNB Chain MCP. Nothing to install.

What risk level is upgrade_proxy? +

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

Can I rate-limit upgrade_proxy? +

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

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

upgrade_proxy is provided by the BNB Chain MCP server (nirholas/bnbchain-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

Enforce policy on every BNB Chain MCP tool call.

Deterministic rules across all 1240 BNB Chain MCP tools. Per-identity grants. Full audit log. Live in minutes. Nothing to install.

GOVERN BNB CHAIN →

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1240 BNB Chain MCP tools catalogued and risk-classified — across an index of 42,500+ MCP servers.

// WHAT UPGRADE_PROXY ON BNB CHAIN MCP DOES

// THE RISK

// HOW TO CONTROL UPGRADE_PROXY

// EXPLORE