config-update · MCP Index Notes MCP: Risk & Policy

WHAT IT DOES

What config-update does on MCP Index Notes

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

WHY IT NEEDS A POLICY

Why config-update needs a policy

This tool modifies server configuration, which is a Write operation (reversible data modification). Severity is medium because configuration changes could affect system behavior, availability, or security posture, but the impact depends on what specific settings can be modified. Without visibility into which settings are mutable, confidence is not higher, but the Write categorization is clear from the description.

From the tool's definition Tool name 'config-update' and description 'Update server configuration settings' indicate modification of configuration data. The verb 'update' is explicitly a write operation that alters existing settings reversibly.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

config-update Rate-limited

config-update 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": {
    "config-update": {
      "limits": [
        {
          "counter": "config-update_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 MCP Index Notes, so you can run agents against it safely.

FAQ

Questions about config-update

What does the config-update tool do? +

Update server configuration settings. It is categorised as a Write tool in the MCP Index Notes MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.

How do I enforce a policy on config-update? +

Register the MCP Index Notes MCP server in PolicyLayer and add a rule for config-update: 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 MCP Index Notes. Nothing to install.

What risk level is config-update? +

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

Can I rate-limit config-update? +

Yes. Add a rate_limit block to the config-update 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 config-update completely? +

Set action: deny in the PolicyLayer policy for config-update. 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 config-update? +

config-update is provided by the MCP Index Notes MCP server (vjsr007/mcp-index-notes). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.