generateKey

Generate a new 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/generatekey.md

WHAT IT DOES

What generateKey does on Fusionauth

AI agents use generateKey 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 generateKey is rated Medium

This tool creates new cryptographic keys, which are security artifacts that persist in the system. While key generation itself is reversible (the keys can be deleted), the act of creating authentication/authorization material represents a write operation that modifies the security posture of the system.

From the tool's definition Tool generates and creates new cryptographic key material (RSA, EC key pairs, or HMAC secrets). The description explicitly states 'Generate a new' which indicates creation of security credentials.

Attacks that exploit this kind of access

RECOMMENDED RULE

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

generateKey Rate-limited

generateKey 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": {
    "generateKey": {
      "limits": [
        {
          "counter": "generatekey_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 generateKey call is checked against it from then on.

FAQ

Questions about generateKey

What does the generateKey tool do? +

Generate a new 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 generateKey? +

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

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

Can I rate-limit generateKey? +

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

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

generateKey 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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