outlook_build_recurrence_pattern

THE RISK

Low Risk

Why outlook_build_recurrence_pattern needs a policy

The tool appears to build/construct a recurrence pattern object, likely as a helper to prepare data for use by other tools (like creating recurring calendar events). It doesn't read, write, execute, destroy, or move money by itself — it just assembles a data structure. This is a utility/helper function with no direct side effects.

From the tool's definition 'Build a recurrence pattern object' — this constructs/assembles a data object in memory

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

POLICY

How to control outlook_build_recurrence_pattern

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

policy.json

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

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

Create a free account and register Outlook — 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 →

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EXPLORE

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All 43 Outlook tools →

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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 outlook_build_recurrence_pattern

What does the outlook_build_recurrence_pattern tool do? +

Build a recurrence pattern object. It is categorised as a Other tool in the Outlook MCP Server, which means it performs auxiliary operations.

How do I enforce a policy on outlook_build_recurrence_pattern? +

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

What risk level is outlook_build_recurrence_pattern? +

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

Can I rate-limit outlook_build_recurrence_pattern? +

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

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

outlook_build_recurrence_pattern is provided by the Outlook MCP server (xenoxilus/outlook-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

Enforce policy on every Outlook tool call.

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

CHECK YOUR STACK →