auth_login

THE RISK

Low Risk

Why auth_login needs a policy

This tool performs authentication/login to Microsoft Fabric. It doesn't read data, write data, execute code, destroy data, or move money — it establishes an authenticated session as a prerequisite for other operations. While credential handling carries some risk, the tool itself is an auth flow, placing it in 'Other'. Severity is low as misuse would at most initiate or expose a login flow.

From the tool's definition Login to Microsoft Fabric. MUST be called before using any other tool.

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

POLICY

How to control auth_login

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

policy.json

{
  "version": "1",
  "default": "deny",
  "tools": {
    "auth_login": {
      "limits": [
        {
          "counter": "auth_login_rate",
          "window": "minute",
          "max": 60,
          "scope": "grant"
        }
      ]
    }
  }
}

auth_login gets a rate cap, and everything else on the server is denied unless you say otherwise.

Create a free account and register Force Fabric 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.

SET A RULE FOR THIS TOOL →

Free to start. No card required.

EXPLORE

Related tools and policies

More Force Fabric MCP Server tools

Destructive auth_logout Logout from Microsoft Fabric and clear cached credentials. Execute lakehouse_run_table_maintenance Run table maintenance (OPTIMIZE with V-Order, Z-ORDER, VACUUM) on a Fabric Lakehouse. Execute eventhouse_auto_optimize AUTO-OPTIMIZE: Scans a Fabric Eventhouse for all fixable issues across all KQL databases a Execute eventhouse_fix AUTO-FIX: Applies fixes to a Fabric Eventhouse. Execute eventhouse_fix_materialized_views AUTO-FIX: Diagnoses and repairs broken materialized views in a Fabric Eventhouse. Execute gateway_fix AUTO-FIX: Applies fixes to gateway and connection issues. Execute lakehouse_auto_optimize AUTO-OPTIMIZE: Discovers ALL Delta tables in a Lakehouse and applies fixes to every table Execute lakehouse_fix AUTO-FIX: Applies Spark SQL fixes to a Lakehouse via Livy API (no notebooks needed).

All 33 Force Fabric MCP Server tools →

Other 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.
Tool risk categories → How PolicyLayer classifies MCP tools by what they can do.
MCP tool → What an MCP tool is and how clients discover and call it.
Rate Limiting MCP Tool Calls: A Practical Guide →
MCP Security: Why Prompt Guardrails Aren't Enough →

FAQ

Questions about auth_login

What does the auth_login tool do? +

Login to Microsoft Fabric. MUST be called before using any other tool. It is categorised as a Other tool in the Force Fabric MCP Server MCP Server, which means it performs auxiliary operations.

How do I enforce a policy on auth_login? +

Register the Force Fabric MCP Server MCP server in PolicyLayer and add a rule for auth_login: 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 Force Fabric MCP Server. Nothing to install.

What risk level is auth_login? +

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

Can I rate-limit auth_login? +

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

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

auth_login is provided by the Force Fabric MCP Server MCP server (tmdaidevs/force-fabric-mcp-server). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

Enforce policy on every Force Fabric MCP Server tool call.

Start from Force Fabric 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 →