addUserPublicKey · Xdevplatform/x MCP: Risk & Policy

WHAT IT DOES

What addUserPublicKey does on Xdevplatform/xmcp

AI agents use addUserPublicKey to create or update resources in Xdevplatform/xmcp — usually the action step of a workflow, after the agent has gathered context. Every call changes real data in your Xdevplatform/xmcp environment.

WHY IT NEEDS A POLICY

Why addUserPublicKey needs a policy

This tool creates or modifies user security settings (public key infrastructure for encryption). It is reversible (keys can be updated or removed) and has side effects limited to data modification rather than deletion or code execution. The medium severity reflects that misuse could enable unauthorized message interception or impersonation, but the impact is bounded to that user's encryption key state.

From the tool's definition Tool name 'addUserPublicKey' and description 'Add a public encryption key for a user chat messages' indicate creation/addition of cryptographic material to user accounts.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

addUserPublicKey Rate-limited

addUserPublicKey stays usable, but capped — an agent stuck in a loop can't make hundreds of changes a minute. Everything else on the server is denied unless you say otherwise.

View as policy code

policy.json

{
  "version": "1",
  "default": "deny",
  "tools": {
    "addUserPublicKey": {
      "limits": [
        {
          "counter": "adduserpublickey_rate",
          "window": "minute",
          "max": 30,
          "scope": "grant"
        }
      ]
    }
  }
}

LIMIT THIS TOOL →

Instant setup, no code required.

PolicyLayer is an MCP gateway: every tool call is checked against your rule before it reaches Xdevplatform/xmcp, so you can run agents against it safely.

FAQ

Questions about addUserPublicKey

What does the addUserPublicKey tool do? +

Add a public encryption key for a user chat messages. It is categorised as a Write tool in the Xdevplatform/xmcp MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.

How do I enforce a policy on addUserPublicKey? +

Register the Xdevplatform/x MCP server in PolicyLayer and add a rule for addUserPublicKey: 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 Xdevplatform/xmcp. Nothing to install.

What risk level is addUserPublicKey? +

addUserPublicKey is a Write tool with medium risk. Write tools should be rate-limited to prevent accidental bulk modifications.

Can I rate-limit addUserPublicKey? +

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

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

addUserPublicKey is provided by the Xdevplatform/x MCP server (xdevplatform/xmcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.