archive_inbox · Jikan MCP: Risk & Policy

WHAT IT DOES

What archive_inbox does on Jikan

AI agents use archive_inbox 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 archive_inbox needs a policy

This tool modifies data state (marks a message as archived) but preserves the underlying data and is typically reversible. It does not delete, execute code, transfer funds, or trigger external side effects. The 'soft-hide' descriptor confirms reversibility, placing it firmly in the Write category.

From the tool's definition The tool 'archive_inbox' performs an archiving operation described as 'soft-hide', indicating reversible modification of message metadata/state rather than deletion. This is a Write operation since archiving can be undone (unarchived).

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

archive_inbox Rate-limited

archive_inbox 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": {
    "archive_inbox": {
      "limits": [
        {
          "counter": "archive_inbox_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 archive_inbox

What does the archive_inbox tool do? +

Archive an inbox message (soft-hide). 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 archive_inbox? +

Register the Jikan MCP server in PolicyLayer and add a rule for archive_inbox: 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 archive_inbox? +

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

Can I rate-limit archive_inbox? +

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

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

archive_inbox 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.