patchEntityTypePermissionWithId

Patches the permission with the given Id for the entity type.

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/patchentitytypepermissionwithid.md

WHAT IT DOES

What patchEntityTypePermissionWithId does on Fusionauth

AI agents use patchEntityTypePermissionWithId 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 patchEntityTypePermissionWithId is rated Medium

This tool creates or modifies permissions reversibly through a patch operation. While not destructive (patches are typically mergeable/reversible), permission modifications have significant security implications since they control authorization boundaries. Classified as Write rather than Execute because the operation is data modification rather than triggering external code execution.

From the tool's definition Tool description states it 'Patches the permission with the given Id for the entity type' - a modification operation. The name 'patchEntityTypePermissionWithId' confirms it modifies entity type permissions via PATCH semantics.

Attacks that exploit this kind of access

RECOMMENDED RULE

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

patchEntityTypePermissionWithId Rate-limited

patchEntityTypePermissionWithId 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": {
    "patchEntityTypePermissionWithId": {
      "limits": [
        {
          "counter": "patchentitytypepermissionwithid_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 patchEntityTypePermissionWithId call is checked against it from then on.

FAQ

Questions about patchEntityTypePermissionWithId

What does the patchEntityTypePermissionWithId tool do? +

Patches the permission with the given Id for the entity type. 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 patchEntityTypePermissionWithId? +

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

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

Can I rate-limit patchEntityTypePermissionWithId? +

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

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

patchEntityTypePermissionWithId 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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