importKeyWithId

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/importkeywithid.md

WHAT IT DOES

What importKeyWithId does on Fusionauth

AI agents use importKeyWithId 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 importKeyWithId is rated Medium

Importing cryptographic keys is a reversible Write operation (keys can be updated/replaced), but it's high-severity because misuse could introduce weak or attacker-controlled keys into the authentication/authorization infrastructure, compromising all reliant systems. Not Destructive (no deletion), not Financial, not Execute (no code execution).

From the tool's definition 'Import an existing RSA or EC key pair or an HMAC secret' — the tool creates/adds cryptographic keys to the system, modifying security-critical configuration.

Attacks that exploit this kind of access

RECOMMENDED RULE

The rule that runs importKeyWithId 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 importKeyWithId, this is the rule to start with:

importKeyWithId Rate-limited

importKeyWithId 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": {
    "importKeyWithId": {
      "limits": [
        {
          "counter": "importkeywithid_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 importKeyWithId call is checked against it from then on.

FAQ

Questions about importKeyWithId

What does the importKeyWithId 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 importKeyWithId? +

Register the Fusionauth MCP server in PolicyLayer and add a rule for importKeyWithId: 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 importKeyWithId? +

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

Can I rate-limit importKeyWithId? +

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

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

importKeyWithId 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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