sendPasswordlessCodeWithId

Send a passwordless authentication code in an email to complete login.

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/sendpasswordlesscodewithid.md

WHAT IT DOES

What sendPasswordlessCodeWithId does on Fusionauth

AI agents use sendPasswordlessCodeWithId 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 sendPasswordlessCodeWithId is rated Medium

While the tool doesn't directly create or modify user data structures, it initiates an email delivery and generates a temporary authentication credential, which constitutes a reversible state change. This is Write rather than Execute because the operation is well-defined (send passwordless code) and not arbitrary code execution. It's not Read because it has side effects.

From the tool's definition Tool performs a passwordless code generation and send operation (e.g., 'Send a passwordless authentication code in an email'). This modifies state by creating a new authentication code and triggers an email delivery action with side effects.

Attacks that exploit this kind of access

RECOMMENDED RULE

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

sendPasswordlessCodeWithId Rate-limited

sendPasswordlessCodeWithId 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": {
    "sendPasswordlessCodeWithId": {
      "limits": [
        {
          "counter": "sendpasswordlesscodewithid_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 sendPasswordlessCodeWithId call is checked against it from then on.

FAQ

Questions about sendPasswordlessCodeWithId

What does the sendPasswordlessCodeWithId tool do? +

Send a passwordless authentication code in an email to complete login. 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 sendPasswordlessCodeWithId? +

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

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

Can I rate-limit sendPasswordlessCodeWithId? +

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

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

sendPasswordlessCodeWithId 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.

KEEP EXPLORING

More on Fusionauth, and thousands of servers like it.

This server

All 314 Fusionauth tools →

Across the catalogue

The MCP Attack Database →

Guides

Govern customer-ops agents →Argument validation →Scoped token →