patchRegistrationWithId

Updates, via PATCH, the registration for the user with the given Id and the application defined in the request.

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/patchregistrationwithid.md

WHAT IT DOES

What patchRegistrationWithId does on Fusionauth

AI agents use patchRegistrationWithId 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 patchRegistrationWithId is rated Medium

This tool modifies authentication/registration state for a user account. While the modification is reversible (hence Write, not Destructive), the severity is high because registration data controls user access and identity binding.

From the tool's definition Tool description states it 'Updates, via PATCH, the registration for the user' — a reversible modification operation. PATCH is a standard HTTP method for partial updates. The tool modifies user registration data tied to a specific user ID and application.

Attacks that exploit this kind of access

RECOMMENDED RULE

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

patchRegistrationWithId Rate-limited

patchRegistrationWithId 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": {
    "patchRegistrationWithId": {
      "limits": [
        {
          "counter": "patchregistrationwithid_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 patchRegistrationWithId call is checked against it from then on.

FAQ

Questions about patchRegistrationWithId

What does the patchRegistrationWithId tool do? +

Updates, via PATCH, the registration for the user with the given Id and the application defined in the request. 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 patchRegistrationWithId? +

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

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

Can I rate-limit patchRegistrationWithId? +

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

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

patchRegistrationWithId 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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