twoFactorLoginWithId
Complete login using a 2FA challenge
This record as markdown: /tools/io-fusionauth-mcp-api/twofactorloginwithid.md
What twoFactorLoginWithId does on Fusionauth
AI agents invoke twoFactorLoginWithId to trigger actions in Fusionauth. What it does depends on the arguments the agent supplies, and its effects often reach beyond the immediate call: builds kicked off, notifications sent, workflows started.
Why twoFactorLoginWithId is rated High
This tool completes an authentication flow by verifying a 2FA challenge and establishing a login session. It triggers an external authentication operation with side effects (session creation, token issuance), making it Execute. Misuse could allow unauthorized access to accounts if an attacker controls the challenge response, hence medium severity.
From the tool's definition Complete login using a 2FA challenge
Attacks that exploit this kind of access
The rule that runs twoFactorLoginWithId 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 twoFactorLoginWithId, this is the rule to start with:
twoFactorLoginWithId stays usable, but rate-capped: a runaway agent can't fire it dozens of times a minute. 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 twoFactorLoginWithId call is checked against it from then on.
Questions about twoFactorLoginWithId
Complete login using a 2FA challenge. It is categorised as a Execute tool in the Fusionauth MCP Server, which means it can trigger actions or run processes. Use rate limits and argument validation.
Register the Fusionauth MCP server in PolicyLayer and add a rule for twoFactorLoginWithId: 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.
twoFactorLoginWithId is a Execute tool with high risk. Execute tools should be rate-limited and have argument validation enabled.
Yes. Add a rate_limit block to the twoFactorLoginWithId 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 twoFactorLoginWithId. 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.
twoFactorLoginWithId 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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