counter · MCP Learning Project MCP: Risk & Policy

WHAT IT DOES

What counter does on MCP Learning Project

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

WHY IT NEEDS A POLICY

Why counter needs a policy

This tool creates or modifies counter state data persistently but does not delete or irreversibly destroy data. 'Manage' implies both read and write operations; state persistence indicates it stores modified values. This is reversible—counter values can be changed or reset.

From the tool's definition Tool name 'counter' combined with description 'Manage a counter with state persistence' indicates creation and modification of counter state values.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

counter Rate-limited

counter 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": {
    "counter": {
      "limits": [
        {
          "counter": "counter_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 Learning Project, so you can run agents against it safely.

FAQ

Questions about counter

What does the counter tool do? +

Manage a counter with state persistence. It is categorised as a Write tool in the MCP Learning Project MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.

How do I enforce a policy on counter? +

Register the MCP Learning Project MCP server in PolicyLayer and add a rule for counter: 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 Learning Project. Nothing to install.

What risk level is counter? +

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

Can I rate-limit counter? +

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

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

counter is provided by the MCP Learning Project MCP server (vishutorvi/mcp-learning-project). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.