authenticate_user

THE RISK

Low Risk

Why authenticate_user needs a policy

Authentication is a read/query operation that verifies credentials and returns a token. It does not create, modify, or delete data. However, it has medium severity because misuse could grant unauthorized access to user accounts and expose session tokens that allow further actions.

From the tool's definition Authenticate a user with email and password

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

POLICY

How to control authenticate_user

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_user:

policy.json

{
  "version": "1",
  "default": "deny",
  "tools": {
    "authenticate_user": {}
  }
}

authenticate_user is read-only, so it stays allowed — but 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.

CAP THIS TOOL →

Free to start. No card required.

EXPLORE

Related tools and policies

More PocketBase MCP Server tools

Destructive delete_collection Delete a collection from PocketBase (admin only) Destructive delete_record Delete a record Execute impersonate_user Impersonate another user (admin only) Write confirm_password_reset Confirm password reset with token Write request_password_reset Request password reset Write auth_refresh Refresh authentication token Write authenticate_with_oauth2 Authenticate a user with OAuth2 Write authenticate_with_otp Authenticate a user with one-time password

All 24 PocketBase MCP Server tools →

Read tools on other servers

M-Team MCP Server get_torrent_detail YouTube MCP Server search_channel Android Forensics ADB MCP Server parse_browser_history 0xarchive web3_challenge

Go deeper

The MCP Attack Database → Documented attack patterns against MCP deployments — and the policies that stop them.
Data exfiltration → How read access becomes an exfiltration channel when chained with untrusted content.
MCP token cost → What connecting this server costs in context-window tokens on every request.
Rate Limiting MCP Tool Calls: A Practical Guide →
MCP Security: Why Prompt Guardrails Aren't Enough →

FAQ

Questions about authenticate_user

What does the authenticate_user tool do? +

Authenticate a user with email and password. It is categorised as a Read tool in the PocketBase MCP Server MCP Server, which means it retrieves data without modifying state.

How do I enforce a policy on authenticate_user? +

Register the PocketBase MCP Server MCP server in PolicyLayer and add a rule for authenticate_user: 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_user? +

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

Can I rate-limit authenticate_user? +

Yes. Add a rate_limit block to the authenticate_user 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_user completely? +

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

authenticate_user 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 →