retrieveFamilyMembersByFamilyIdWithId
Retrieves all the members of a family by the unique Family Id.
This record as markdown: /tools/io-fusionauth-mcp-api/retrievefamilymembersbyfamilyidwithid.md
What retrieveFamilyMembersByFamilyIdWithId does on Fusionauth
AI agents call retrieveFamilyMembersByFamilyIdWithId 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.
Why retrieveFamilyMembersByFamilyIdWithId is rated Low
This tool queries and returns family member data based on a family ID parameter. It performs a read-only operation with no destructive, financial, or code-execution implications. The blast radius of misuse is minimal—an attacker could only access family membership information, not modify or delete it.
From the tool's definition Tool name contains 'retrieve' and description states 'Retrieves all the members of a family by the unique Family Id.' The verb 'retrieves' indicates data querying with no modification or side effects.
Attacks that exploit this kind of access
The rule that runs retrieveFamilyMembersByFamilyIdWithId 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 retrieveFamilyMembersByFamilyIdWithId, this is the rule to start with:
retrieveFamilyMembersByFamilyIdWithId is read-only, so it stays allowed. Everything else on the server is denied unless you say otherwise.
The button opens the PolicyLayer dashboard: create your workspace, connect Fusionauth, apply this rule, and every retrieveFamilyMembersByFamilyIdWithId call is checked against it from then on.
Questions about retrieveFamilyMembersByFamilyIdWithId
Retrieves all the members of a family by the unique Family Id. It is categorised as a Read tool in the Fusionauth MCP Server, which means it retrieves data without modifying state.
Register the Fusionauth MCP server in PolicyLayer and add a rule for retrieveFamilyMembersByFamilyIdWithId: 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.
retrieveFamilyMembersByFamilyIdWithId is a Read tool with low risk. Read-only tools are generally safe to allow by default.
Yes. Add a rate_limit block to the retrieveFamilyMembersByFamilyIdWithId 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.
Set action: deny in the PolicyLayer policy for retrieveFamilyMembersByFamilyIdWithId. 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.
retrieveFamilyMembersByFamilyIdWithId 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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