searchUsersByIdsWithId

Retrieves the users for the given Ids. If any Id is invalid, it is ignored.

SERVERFusionauth SOURCE@fusionauth/mcp-api

Low RISK CLASS

Category Read

Parameters 00 required

Recommended Allowedsee the rule below

Registry record Grade F, identity unverified Pull the record →

This record as markdown: /tools/io-fusionauth-mcp-api/searchusersbyidswithid.md

WHAT IT DOES

What searchUsersByIdsWithId does on Fusionauth

AI agents call searchUsersByIdsWithId to retrieve information from Fusionauth without modifying anything. It is typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.

RISK

Why searchUsersByIdsWithId is rated Low

This tool retrieves user data based on provided IDs with no side effects or ability to modify, delete, or execute external operations. The verb 'retrieves' and the fact that invalid IDs are simply ignored confirm this is a safe read-only operation.

From the tool's definition Description states "Retrieves the users for the given Ids" - a straightforward query operation with no modification or deletion of data.

Attacks that exploit this kind of access

RECOMMENDED RULE

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

searchUsersByIdsWithId Allowed

searchUsersByIdsWithId is read-only, so it stays allowed. Everything else on the server is denied unless you say otherwise.

View as policy code

policy.json

{
  "version": "1",
  "default": "deny",
  "tools": {
    "searchUsersByIdsWithId": {}
  }
}

ALLOW ONLY THIS TOOL → Instant setup, no code required.

The button opens the PolicyLayer dashboard: create your workspace, connect Fusionauth, apply this rule, and every searchUsersByIdsWithId call is checked against it from then on.

FAQ

Questions about searchUsersByIdsWithId

What does the searchUsersByIdsWithId tool do? +

Retrieves the users for the given Ids. If any Id is invalid, it is ignored. It is categorised as a Read tool in the Fusionauth MCP Server, which means it retrieves data without modifying state.

How do I enforce a policy on searchUsersByIdsWithId? +

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

searchUsersByIdsWithId is a Read tool with low risk. Read-only tools are generally safe to allow by default.

Can I rate-limit searchUsersByIdsWithId? +

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

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

searchUsersByIdsWithId 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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