patchFormWithId

Patches the form 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/patchformwithid.md

WHAT IT DOES

What patchFormWithId does on Fusionauth

AI agents use patchFormWithId 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 patchFormWithId is rated Medium

This tool modifies form configuration or state in FusionAuth, which is reversible (forms can be patched again or reverted). It does not delete data (Destructive), execute arbitrary code (Execute), move money (Financial), or merely read data (Read).

From the tool's definition Tool name "patchFormWithId" and description "Patches the form with the given Id" indicate a PATCH operation that modifies form data in FusionAuth. PATCH is a standard HTTP method for partial updates.

Attacks that exploit this kind of access

RECOMMENDED RULE

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

patchFormWithId Rate-limited

patchFormWithId 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": {
    "patchFormWithId": {
      "limits": [
        {
          "counter": "patchformwithid_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 patchFormWithId call is checked against it from then on.

FAQ

Questions about patchFormWithId

What does the patchFormWithId tool do? +

Patches the form 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 patchFormWithId? +

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

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

Can I rate-limit patchFormWithId? +

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

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

patchFormWithId 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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