close_csm_case · ServiceNow- MCP: Risk & Policy

WHAT IT DOES

What close_csm_case does on ServiceNow-MCP

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

WHY IT NEEDS A POLICY

Why close_csm_case needs a policy

Closing a CSM case is a write operation that modifies data state reversibly—the case can be reopened if needed. This is not destructive (data is preserved), not a read operation, and has no financial impact. The blast radius is medium because inadvertent case closures could disrupt customer service workflows and require manual reopening, but the harm is recoverable and localized to case management.

From the tool's definition Tool description states 'Close a CSM case with resolution details' which modifies case state from open to closed, a reversible state change. The requirement 'WRITE_ENABLED=true' confirms it performs write operations.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

close_csm_case Rate-limited

close_csm_case 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": {
    "close_csm_case": {
      "limits": [
        {
          "counter": "close_csm_case_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 ServiceNow-MCP, so you can run agents against it safely.

FAQ

Questions about close_csm_case

What does the close_csm_case tool do? +

Close a CSM case with resolution details (requires WRITE_ENABLED=true). It is categorised as a Write tool in the ServiceNow-MCP MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.

How do I enforce a policy on close_csm_case? +

Register the ServiceNow- MCP server in PolicyLayer and add a rule for close_csm_case: 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 ServiceNow-MCP. Nothing to install.

What risk level is close_csm_case? +

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

Can I rate-limit close_csm_case? +

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

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

close_csm_case is provided by the ServiceNow- MCP server (tedorigawa001/servicenow-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.