retrieveLambdasByTypeWithId
Retrieves all the lambdas for the provided type.
This record as markdown: /tools/io-fusionauth-mcp-api/retrievelambdasbytypewithid.md
What retrieveLambdasByTypeWithId does on Fusionauth
AI agents call retrieveLambdasByTypeWithId 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 retrieveLambdasByTypeWithId is rated Low
This tool fetches lambda configuration data without altering any state. It is a read-only operation that queries existing resources, fitting the Read category. Severity is low because lambda metadata retrieval poses minimal risk; the blast radius of misuse is exposure of lambda configurations rather than system compromise or data destruction.
From the tool's definition Tool name contains 'retrieve' and description states 'Retrieves all the lambdas for the provided type' — a query operation with no modification or side effects.
Attacks that exploit this kind of access
The rule that runs retrieveLambdasByTypeWithId 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 retrieveLambdasByTypeWithId, this is the rule to start with:
retrieveLambdasByTypeWithId 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 retrieveLambdasByTypeWithId call is checked against it from then on.
Questions about retrieveLambdasByTypeWithId
Retrieves all the lambdas for the provided type. 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 retrieveLambdasByTypeWithId: 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.
retrieveLambdasByTypeWithId 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 retrieveLambdasByTypeWithId 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 retrieveLambdasByTypeWithId. 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.
retrieveLambdasByTypeWithId 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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