patchFormFieldWithId

Patches the form field with the given Id.

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/patchformfieldwithid.md

WHAT IT DOES

What patchFormFieldWithId does on Fusionauth

AI agents use patchFormFieldWithId 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 patchFormFieldWithId is rated Medium

The tool updates or modifies a form field configuration. This is a Write operation because it creates or modifies data reversibly. Severity is medium because misuse could alter authentication or identity verification form fields in ways that affect user experience or security, but the change is not irreversible and doesn't directly move money or execute arbitrary code.

From the tool's definition Tool name contains 'patch' and description states 'Patches the form field with the given Id' — patch operations modify data reversibly without deletion or destruction.

Attacks that exploit this kind of access

RECOMMENDED RULE

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

patchFormFieldWithId Rate-limited

patchFormFieldWithId 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": {
    "patchFormFieldWithId": {
      "limits": [
        {
          "counter": "patchformfieldwithid_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 patchFormFieldWithId call is checked against it from then on.

FAQ

Questions about patchFormFieldWithId

What does the patchFormFieldWithId tool do? +

Patches the form field with the given Id. 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 patchFormFieldWithId? +

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

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

Can I rate-limit patchFormFieldWithId? +

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

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

patchFormFieldWithId 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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