importKey

Import an existing RSA or EC key pair or an HMAC secret.

SERVERFusionauth SOURCE@fusionauth/mcp-api

Medium RISK CLASS

Category Write

Parameters 00 required

Recommended Rate-limitedsee the rule below

Registry record Grade F, identity unverified Pull the record →

This record as markdown: /tools/io-fusionauth-mcp-api/importkey.md

WHAT IT DOES

What importKey does on Fusionauth

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

RISK

Why importKey is rated Medium

This tool creates or modifies security credentials (cryptographic keys) in the FusionAuth system. While not irreversible deletion, importing keys is a Write operation with high severity because misuse could introduce unauthorized cryptographic material, compromise authentication/signing mechanisms, or enable attackers to forge tokens.

From the tool's definition Tool name 'importKey' and description 'Import an existing RSA or EC key pair or an HMAC secret' indicate creation/addition of cryptographic material to the system.

Attacks that exploit this kind of access

RECOMMENDED RULE

The rule that runs importKey safely

PolicyLayer is an MCP gateway: it sits between your AI agents and Fusionauth, and checks every tool call against a rule you set before the call runs. Nothing changes on the server itself. For importKey, this is the rule to start with:

importKey Rate-limited

importKey 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": {
    "importKey": {
      "limits": [
        {
          "counter": "importkey_rate",
          "window": "minute",
          "max": 30,
          "scope": "grant"
        }
      ]
    }
  }
}

LIMIT THIS TOOL → Instant setup, no code required.

The button opens the PolicyLayer dashboard: create your workspace, connect Fusionauth, apply this rule, and every importKey call is checked against it from then on.

FAQ

Questions about importKey

What does the importKey tool do? +

Import an existing RSA or EC key pair or an HMAC secret. It is categorised as a Write tool in the Fusionauth MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.

How do I enforce a policy on importKey? +

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

What risk level is importKey? +

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

Can I rate-limit importKey? +

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

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

importKey is provided by the Fusionauth MCP server (@fusionauth/mcp-api). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

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