update_column · SharePoint MCP Server MCP: Risk & Policy

WHAT IT DOES

What update_column does on SharePoint MCP Server

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

WHY IT NEEDS A POLICY

Why update_column needs a policy

This tool performs reversible modifications to column configuration in SharePoint lists. It changes properties like display name, description, and validation settings, but does not destroy data or irreversibly alter structure. The changes can be undone by updating the column again with different values.

From the tool's definition Tool description explicitly states "Update settings of an existing column" which modifies schema metadata (display name, description, required, default value, indexed, choices) rather than deleting or creating new structures.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

update_column Rate-limited

update_column 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": {
    "update_column": {
      "limits": [
        {
          "counter": "update_column_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 SharePoint MCP Server, so you can run agents against it safely.

FAQ

Questions about update_column

What does the update_column tool do? +

Update settings of an existing column (display name, description, required, default value, indexed, choices). It is categorised as a Write tool in the SharePoint 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 update_column? +

Register the SharePoint MCP Server MCP server in PolicyLayer and add a rule for update_column: 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 SharePoint MCP Server. Nothing to install.

What risk level is update_column? +

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

Can I rate-limit update_column? +

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

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

update_column is provided by the SharePoint MCP Server MCP server (lukassevcik/sharepoint-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.