patchApplicationRoleWithId

Updates, via PATCH, the application role with the given Id for the application.

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/patchapplicationrolewithid.md

WHAT IT DOES

What patchApplicationRoleWithId does on Fusionauth

AI agents use patchApplicationRoleWithId 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 patchApplicationRoleWithId is rated Medium

This tool modifies application role configuration via PATCH, which is a reversible write operation. It does not delete data (ruling out Destructive), does not move money (not Financial), does not execute arbitrary code (not Execute), and does not merely read (not Read).

From the tool's definition patchApplicationRoleWithId: 'Updates, via PATCH, the application role with the given Id for the application.' — PATCH is an HTTP method for modifying existing resources reversibly.

Attacks that exploit this kind of access

RECOMMENDED RULE

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

patchApplicationRoleWithId Rate-limited

patchApplicationRoleWithId 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": {
    "patchApplicationRoleWithId": {
      "limits": [
        {
          "counter": "patchapplicationrolewithid_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 patchApplicationRoleWithId call is checked against it from then on.

FAQ

Questions about patchApplicationRoleWithId

What does the patchApplicationRoleWithId tool do? +

Updates, via PATCH, the application role with the given Id for the application. 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 patchApplicationRoleWithId? +

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

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

Can I rate-limit patchApplicationRoleWithId? +

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

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

patchApplicationRoleWithId 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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