importWebAuthnCredentialWithId

Import a WebAuthn credential

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/importwebauthncredentialwithid.md

WHAT IT DOES

What importWebAuthnCredentialWithId does on Fusionauth

AI agents use importWebAuthnCredentialWithId 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 importWebAuthnCredentialWithId is rated Medium

This tool creates or modifies user authentication credentials (WebAuthn), which is a reversible write operation. It's classified as high severity because misuse could compromise user account security by adding unauthorized credentials, but it's not Destructive (credentials can be removed) or Financial. The WithId suffix suggests it targets a specific user, limiting blast radius compared to bulk operations.

From the tool's definition Tool name 'importWebAuthnCredentialWithId' and description 'Import a WebAuthn credential' indicate creation/modification of authentication credentials for a user.

Attacks that exploit this kind of access

RECOMMENDED RULE

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

importWebAuthnCredentialWithId Rate-limited

importWebAuthnCredentialWithId 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": {
    "importWebAuthnCredentialWithId": {
      "limits": [
        {
          "counter": "importwebauthncredentialwithid_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 importWebAuthnCredentialWithId call is checked against it from then on.

FAQ

Questions about importWebAuthnCredentialWithId

What does the importWebAuthnCredentialWithId tool do? +

Import a WebAuthn credential. 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 importWebAuthnCredentialWithId? +

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

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

Can I rate-limit importWebAuthnCredentialWithId? +

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

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

importWebAuthnCredentialWithId 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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