import_keystore · Tenzro Ledger MCP: Risk & Policy

WHAT IT DOES

What import_keystore does on Tenzro Ledger MCP

AI agents use import_keystore to create or update resources in Tenzro Ledger MCP — usually the action step of a workflow, after the agent has gathered context. Every call changes real data in your Tenzro Ledger MCP environment.

WHY IT NEEDS A POLICY

Why import_keystore needs a policy

This tool modifies system state by importing wallet keys, which is a reversible Write operation (the imported keystore could theoretically be removed). While it handles sensitive cryptographic material, it does not directly move funds (Financial), execute arbitrary code (Execute), or destroy data (Destructive).

From the tool's definition Tool name 'import_keystore' with description 'Import a wallet from an encrypted keystore file' indicates creation/modification of wallet state by importing credentials into the system.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

import_keystore Rate-limited

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

FAQ

Questions about import_keystore

What does the import_keystore tool do? +

Import a wallet from an encrypted keystore file. It is categorised as a Write tool in the Tenzro Ledger MCP MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.

How do I enforce a policy on import_keystore? +

Register the Tenzro Ledger MCP server in PolicyLayer and add a rule for import_keystore: 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 import_keystore? +

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

Can I rate-limit import_keystore? +

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

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

import_keystore 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.