updateKeyWithId

Updates the key 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/updatekeywithid.md

WHAT IT DOES

What updateKeyWithId does on Fusionauth

AI agents use updateKeyWithId 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 updateKeyWithId is rated Medium

This tool creates or modifies data reversibly by updating an API key. The operation is not destructive (the key is not deleted), not financial, and not arbitrary code execution. However, API keys are sensitive credentials—modifying them could affect authentication and access control.

From the tool's definition Tool name 'updateKeyWithId' and description 'Updates the key with the given Id' indicate modification of an existing API key or credential object.

Attacks that exploit this kind of access

RECOMMENDED RULE

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

updateKeyWithId Rate-limited

updateKeyWithId 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": {
    "updateKeyWithId": {
      "limits": [
        {
          "counter": "updatekeywithid_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 updateKeyWithId call is checked against it from then on.

FAQ

Questions about updateKeyWithId

What does the updateKeyWithId tool do? +

Updates the key 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 updateKeyWithId? +

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

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

Can I rate-limit updateKeyWithId? +

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

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

updateKeyWithId 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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