updateApplicationRoleWithId

Updates 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/updateapplicationrolewithid.md

WHAT IT DOES

What updateApplicationRoleWithId does on Fusionauth

AI agents use updateApplicationRoleWithId 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 updateApplicationRoleWithId is rated Medium

The tool modifies application role settings, which affects authorization and access control within a FusionAuth system. While reversible (hence Write not Destructive), it has high severity because misconfigured roles could grant unintended permissions to users or applications, impacting system security and access control.

From the tool's definition Tool name 'updateApplicationRole' and description 'Updates the application role' indicate a modification operation on application role configuration. This is a reversible write operation.

Attacks that exploit this kind of access

RECOMMENDED RULE

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

updateApplicationRoleWithId Rate-limited

updateApplicationRoleWithId 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": {
    "updateApplicationRoleWithId": {
      "limits": [
        {
          "counter": "updateapplicationrolewithid_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 updateApplicationRoleWithId call is checked against it from then on.

FAQ

Questions about updateApplicationRoleWithId

What does the updateApplicationRoleWithId tool do? +

Updates 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 updateApplicationRoleWithId? +

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

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

Can I rate-limit updateApplicationRoleWithId? +

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

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

updateApplicationRoleWithId 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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