set-auth-code

THE RISK

Medium Risk

Why set-auth-code needs a policy

This tool creates or modifies authentication credentials, which is a reversible write operation. While it doesn't directly manipulate task data, it establishes the authorization context for subsequent API calls. Severity is medium because misuse could grant unauthorized access to the user's Google Tasks account, but the tool itself doesn't immediately execute actions or delete data—it sets up permissions.

From the tool's definition Tool name 'set-auth-code' and description 'Set the authentication code received from Google OAuth flow' indicate this tool modifies authentication state by storing/setting an OAuth credential.

Documented attack patterns abuse exactly the kind of access set-auth-code gives an agent:

POLICY

How to control set-auth-code

PolicyLayer is an MCP gateway — it sits between your AI agents and Google Tasks MCP Server, and nothing reaches the server without passing your rules. This is the rule we recommend for set-auth-code:

policy.json

{
  "version": "1",
  "default": "deny",
  "tools": {
    "set-auth-code": {
      "limits": [
        {
          "counter": "set-auth-code_rate",
          "window": "minute",
          "max": 30,
          "scope": "grant"
        }
      ]
    }
  }
}

set-auth-code 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 Google Tasks 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 Google Tasks MCP Server tools

Destructive clear-completed-tasks Clear all completed tasks from a task list Destructive delete-task Delete a task Destructive delete-tasklist Delete a task list Write complete-task Mark a task as completed Write create-task Create a new task in a task list Write create-tasklist Create a new task list Write move-task Move a task to another position within the same list, or to a different list via destinati Write update-task Update an existing task

All 15 Google Tasks MCP Server tools →

Write tools on other servers

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Go deeper

Govern customer-ops agents → PII redaction, approval on external messages, and no-bulk-delete rules on the records agents change.
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 →
PolicyLayer vs alternatives → How deterministic, per-call MCP policy compares with gateways, identity layers, and authorisation platforms.

FAQ

Questions about set-auth-code

What does the set-auth-code tool do? +

Set the authentication code received from Google OAuth flow. It is categorised as a Write tool in the Google Tasks 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 set-auth-code? +

Register the Google Tasks MCP Server MCP server in PolicyLayer and add a rule for set-auth-code: 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 Google Tasks MCP Server. Nothing to install.

What risk level is set-auth-code? +

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

Can I rate-limit set-auth-code? +

Yes. Add a rate_limit block to the set-auth-code 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 set-auth-code completely? +

Set action: deny in the PolicyLayer policy for set-auth-code. 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 set-auth-code? +

set-auth-code is provided by the Google Tasks MCP Server MCP server (arpitbatra123/mcp-googletasks). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

Enforce policy on every Google Tasks MCP Server tool call.

Start from Google Tasks 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 →