contact_create · M365 MCP: Risk & Policy

WHAT IT DOES

What contact_create does on M365

AI agents use contact_create to create or update resources in M365 — usually the action step of a workflow, after the agent has gathered context. Every call changes real data in your M365 environment.

WHY IT NEEDS A POLICY

Why contact_create needs a policy

Creating contacts is a Write operation that modifies data reversibly—contacts can be updated or deleted later. It has no permanent destructive effects and doesn't execute arbitrary code or move money. Severity is medium because contact creation at scale could clutter the address book or be used for spam/phishing preparation, but the blast radius is limited to the contacts directory.

From the tool's definition Tool name 'contact_create' indicates creation of contact records in Microsoft 365 Contacts service. Description is empty but the naming pattern and server context (M365 contact management) make the intent clear.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

contact_create Rate-limited

contact_create 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": {
    "contact_create": {
      "limits": [
        {
          "counter": "contact_create_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 M365, so you can run agents against it safely.

FAQ

Questions about contact_create

What does the contact_create tool do? +

contact_create. It is categorised as a Write tool in the M365 MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.

How do I enforce a policy on contact_create? +

Register the M365 MCP server in PolicyLayer and add a rule for contact_create: 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 M365. Nothing to install.

What risk level is contact_create? +

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

Can I rate-limit contact_create? +

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

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

contact_create is provided by the M365 MCP server (robin-collins/m365-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.