set_default_account · Todo MCP: Risk & Policy

WHAT IT DOES

What set_default_account does on Todo

AI agents use set_default_account to create or update resources in Todo — usually the action step of a workflow, after the agent has gathered context. Every call changes real data in your Todo environment.

WHY IT NEEDS A POLICY

Why set_default_account needs a policy

This tool modifies stored account preferences by designating which Microsoft To Do account is default. While it doesn't create/delete accounts or tasks, it changes persisted state that affects which account subsequent operations target. This is Write-category (reversible modification) rather than Read.

From the tool's definition Tool name 'set_default_account' and description 'Set the default stored Microsoft To Do account' indicate modification of stored configuration/account settings.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

set_default_account Rate-limited

set_default_account 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.

View as policy code

policy.json

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

LIMIT THIS TOOL →

Instant setup, no code required.

PolicyLayer is an MCP gateway: every tool call is checked against your rule before it reaches Todo, so you can run agents against it safely.

FAQ

Questions about set_default_account

What does the set_default_account tool do? +

Set the default stored Microsoft To Do account. It is categorised as a Write tool in the Todo 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_default_account? +

Register the Todo MCP server in PolicyLayer and add a rule for set_default_account: 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 Todo. Nothing to install.

What risk level is set_default_account? +

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

Can I rate-limit set_default_account? +

Yes. Add a rate_limit block to the set_default_account 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_default_account completely? +

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

set_default_account is provided by the Todo MCP server (jc1122/todo-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.