stop_session · Jikan MCP: Risk & Policy

WHAT IT DOES

What stop_session does on Jikan

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

WHY IT NEEDS A POLICY

Why stop_session needs a policy

Stopping an active session modifies the state of the session (from active to stopped/completed), which is a reversible write operation. It does not delete data irreversibly, execute arbitrary code, or involve financial transactions. The severity is medium because prematurely stopping a session could disrupt tracking data, but the blast radius is limited.

From the tool's definition Stop an active session

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

stop_session Rate-limited

stop_session 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": {
    "stop_session": {
      "limits": [
        {
          "counter": "stop_session_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 Jikan, so you can run agents against it safely.

FAQ

Questions about stop_session

What does the stop_session tool do? +

Stop an active session. Free (0 credits). It is categorised as a Write tool in the Jikan MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.

How do I enforce a policy on stop_session? +

Register the Jikan MCP server in PolicyLayer and add a rule for stop_session: 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 Jikan. Nothing to install.

What risk level is stop_session? +

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

Can I rate-limit stop_session? +

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

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

stop_session is provided by the Jikan MCP server (thunderrabbit/jikan). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.