create_past_session · Jikan MCP: Risk & Policy

WHAT IT DOES

What create_past_session does on Jikan

AI agents use create_past_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 create_past_session needs a policy

The tool creates a new session record (a past session entry) in the behavioral tracking system. This is reversible data creation (Write category) rather than Read (no query), Execute (no arbitrary code execution), Destructive (reversible via deletion tools like 'delete_emotion_event' that exist on the server), Financial (no money involved), or Other.

From the tool's definition Tool name 'create_past_session' indicates data creation/modification. The sibling tools on the server include 'create_activity', 'create_todo', and 'complete_todo', which are all Write operations.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

create_past_session Rate-limited

create_past_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": {
    "create_past_session": {
      "limits": [
        {
          "counter": "create_past_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 create_past_session

What does the create_past_session tool do? +

create_past_session. 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 create_past_session? +

Register the Jikan MCP server in PolicyLayer and add a rule for create_past_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 create_past_session? +

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

Can I rate-limit create_past_session? +

Yes. Add a rate_limit block to the create_past_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 create_past_session completely? +

Set action: deny in the PolicyLayer policy for create_past_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 create_past_session? +

create_past_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.