send_inbox · Jikan MCP: Risk & Policy

WHAT IT DOES

What send_inbox does on Jikan

AI agents use send_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 send_inbox needs a policy

Based on the server's purpose (behavioral session tracking and activity management) and the pattern of sibling tools, 'send_inbox' most likely creates or adds an item to an inbox—a reversible write operation. Without explicit documentation, confidence is moderate (0.65).

From the tool's definition Tool name 'send_inbox' suggests creating or posting a message/item to an inbox. The description is empty, but sibling tools on this server include 'archive_inbox', 'create_todo', 'create_activity', 'create_past_session', and 'complete_todo', all of which are…

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

send_inbox Rate-limited

send_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": {
    "send_inbox": {
      "limits": [
        {
          "counter": "send_inbox_rate",
          "window": "minute",
          "max": 30,
          "scope": "grant"
        }
      ]
    }
  }
}

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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 send_inbox

What does the send_inbox tool do? +

send_inbox. 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 send_inbox? +

Register the Jikan MCP server in PolicyLayer and add a rule for send_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 send_inbox? +

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

Can I rate-limit send_inbox? +

Yes. Add a rate_limit block to the send_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 send_inbox completely? +

Set action: deny in the PolicyLayer policy for send_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 send_inbox? +

send_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.