retrieveMessengerWithId

Retrieves the messenger with the given Id.

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/retrievemessengerwithid.md

WHAT IT DOES

What retrieveMessengerWithId does on Fusionauth

AI agents call retrieveMessengerWithId 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 retrieveMessengerWithId is rated Low

This tool performs data retrieval only. It fetches a messenger configuration or object by ID, which is a read-only operation with no capability to modify, delete, or execute actions. The blast radius of misuse is minimal—an attacker could only access existing messenger data, not manipulate system state or trigger external operations.

From the tool's definition Tool name 'retrieveMessengerWithId' and description 'Retrieves the messenger with the given Id' indicate a query/fetch operation without modification or side effects.

Attacks that exploit this kind of access

RECOMMENDED RULE

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

retrieveMessengerWithId Allowed

retrieveMessengerWithId 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": {
    "retrieveMessengerWithId": {}
  }
}

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 retrieveMessengerWithId call is checked against it from then on.

FAQ

Questions about retrieveMessengerWithId

What does the retrieveMessengerWithId tool do? +

Retrieves the messenger with the given Id. 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 retrieveMessengerWithId? +

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

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

Can I rate-limit retrieveMessengerWithId? +

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

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

retrieveMessengerWithId 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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