authenticate_with_otp

THE RISK

Medium Risk

Why authenticate_with_otp needs a policy

OTP authentication establishes a session/auth token, which is a write/create operation (creating an authenticated session). It doesn't read data passively, nor is it destructive or financial. Misuse could allow unauthorized session creation, giving medium severity.

From the tool's definition Authenticate a user with one-time password

Documented attack patterns abuse exactly the kind of access authenticate_with_otp gives an agent:

POLICY

How to control authenticate_with_otp

PolicyLayer is an MCP gateway — it sits between your AI agents and PocketBase MCP Server, and nothing reaches the server without passing your rules. This is the rule we recommend for authenticate_with_otp:

policy.json

{
  "version": "1",
  "default": "deny",
  "tools": {
    "authenticate_with_otp": {
      "limits": [
        {
          "counter": "authenticate_with_otp_rate",
          "window": "minute",
          "max": 30,
          "scope": "grant"
        }
      ]
    }
  }
}

authenticate_with_otp stays usable, but capped — an agent stuck in a loop can't make hundreds of changes a minute. Everything else on the server is denied unless you say otherwise.

Create a free account and register PocketBase MCP Server — nothing to install.
Add this policy — paste it, or build it visually.
Point your MCP client (Claude, Cursor, anything) at your gateway URL.

LIMIT THIS TOOL →

Free to start. No card required.

EXPLORE

Related tools and policies

More PocketBase MCP Server tools

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All 24 PocketBase MCP Server tools →

Write tools on other servers

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Go deeper

The MCP Attack Database → Documented attack patterns against MCP deployments — and the policies that stop them.
Argument validation → Checking tool call arguments against schema and policy before they run.
Scoped token → Per-person credentials that grant a defined subset of servers and tools.
Rate Limiting MCP Tool Calls: A Practical Guide →
MCP Security: Why Prompt Guardrails Aren't Enough →

FAQ

Questions about authenticate_with_otp

What does the authenticate_with_otp tool do? +

Authenticate a user with one-time password. It is categorised as a Write tool in the PocketBase MCP Server MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.

How do I enforce a policy on authenticate_with_otp? +

Register the PocketBase MCP Server MCP server in PolicyLayer and add a rule for authenticate_with_otp: 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 PocketBase MCP Server. Nothing to install.

What risk level is authenticate_with_otp? +

authenticate_with_otp is a Write tool with medium risk. Write tools should be rate-limited to prevent accidental bulk modifications.

Can I rate-limit authenticate_with_otp? +

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

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

authenticate_with_otp is provided by the PocketBase MCP Server MCP server (mrwyndham/pocketbase-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

Enforce policy on every PocketBase MCP Server tool call.

Start from PocketBase MCP Server, add the rest of your stack, and see everything your agents can call. Then put policy on all of it.

CHECK YOUR STACK →