patchOAuthScopeWithId

Updates, via PATCH, the custom OAuth scope 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/patchoauthscopewithid.md

WHAT IT DOES

What patchOAuthScopeWithId does on Fusionauth

AI agents use patchOAuthScopeWithId 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 patchOAuthScopeWithId is rated Medium

This tool modifies OAuth scope configuration, which affects authentication and authorization policies. While reversible (Write rather than Destructive), misconfiguration could grant unintended permissions to applications or users, creating a security risk with meaningful blast radius. High severity due to the sensitive nature of OAuth scope management in authentication systems.

From the tool's definition Tool name contains 'patch' and description states 'Updates, via PATCH, the custom OAuth scope'. PATCH is an HTTP method for modifying existing resources. OAuth scopes control authorization permissions.

Attacks that exploit this kind of access

RECOMMENDED RULE

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

patchOAuthScopeWithId Rate-limited

patchOAuthScopeWithId 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": {
    "patchOAuthScopeWithId": {
      "limits": [
        {
          "counter": "patchoauthscopewithid_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 patchOAuthScopeWithId call is checked against it from then on.

FAQ

Questions about patchOAuthScopeWithId

What does the patchOAuthScopeWithId tool do? +

Updates, via PATCH, the custom OAuth scope 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 patchOAuthScopeWithId? +

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

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

Can I rate-limit patchOAuthScopeWithId? +

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

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

patchOAuthScopeWithId 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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