BC_Update_Item · Business Central MCP Server MCP

WHAT IT DOES

What BC_Update_Item does on Business Central MCP Server

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

WHY IT NEEDS A POLICY

Why BC_Update_Item needs a policy

This tool creates or modifies data reversibly, which is the defining characteristic of the Write category. Updating an item in an ERP system like Business Central changes existing records but does not permanently delete or destroy data, nor does it execute arbitrary code or move money.

From the tool's definition Tool description states 'Update an existing item in Business Central.' The name 'BC_Update_Item' and description clearly indicate modification of existing data.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

BC_Update_Item Rate-limited

BC_Update_Item 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": {
    "BC_Update_Item": {
      "limits": [
        {
          "counter": "bc_update_item_rate",
          "window": "minute",
          "max": 30,
          "scope": "grant"
        }
      ]
    }
  }
}

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Instant setup, no code required.

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

FAQ

Questions about BC_Update_Item

What does the BC_Update_Item tool do? +

Update an existing item in Business Central. It is categorised as a Write tool in the Business Central 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 BC_Update_Item? +

Register the Business Central MCP Server MCP server in PolicyLayer and add a rule for BC_Update_Item: 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 Business Central MCP Server. Nothing to install.

What risk level is BC_Update_Item? +

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

Can I rate-limit BC_Update_Item? +

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

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

BC_Update_Item is provided by the Business Central MCP Server MCP server (luismdev/mcp-business-central-server). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.