x25519_key_exchange · Tenzro Ledger MCP: Risk & Policy

WHAT IT DOES

What x25519_key_exchange does on Tenzro Ledger MCP

AI agents invoke x25519_key_exchange to trigger actions in Tenzro Ledger MCP. 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 x25519_key_exchange needs a policy

This tool executes a cryptographic operation (Diffie-Hellman key exchange) that computes and returns a shared secret. It is not a simple read of stored data — it performs an active computation using key material. Misuse could expose or misuse cryptographic secrets in an agent context, but it doesn't directly write, delete, or move funds.

From the tool's definition Perform X25519 Diffie-Hellman key exchange. Returns shared secret.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

x25519_key_exchange Rate-limited

x25519_key_exchange 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": {
    "x25519_key_exchange": {
      "limits": [
        {
          "counter": "x25519_key_exchange_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 Tenzro Ledger MCP, so you can run agents against it safely.

FAQ

Questions about x25519_key_exchange

What does the x25519_key_exchange tool do? +

Perform X25519 Diffie-Hellman key exchange. Returns shared secret. It is categorised as a Execute tool in the Tenzro Ledger 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 x25519_key_exchange? +

Register the Tenzro Ledger MCP server in PolicyLayer and add a rule for x25519_key_exchange: 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 Tenzro Ledger MCP. Nothing to install.

What risk level is x25519_key_exchange? +

x25519_key_exchange is a Execute tool with high risk. Execute tools should be rate-limited and have argument validation enabled.

Can I rate-limit x25519_key_exchange? +

Yes. Add a rate_limit block to the x25519_key_exchange 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 x25519_key_exchange completely? +

Set action: deny in the PolicyLayer policy for x25519_key_exchange. 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 x25519_key_exchange? +

x25519_key_exchange is provided by the Tenzro Ledger MCP server (https://canton-mcp.tenzro.network/mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.