update_inbox · Repsona MCP: Risk & Policy

WHAT IT DOES

What update_inbox does on Repsona

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

WHY IT NEEDS A POLICY

Why update_inbox needs a policy

This tool modifies inbox item state (marking items as read or unread), which is a reversible data change. It does not delete data (so not Destructive), does not execute code or commands (so not Execute), and does not involve financial operations (so not Financial). It falls cleanly into Write category as a state update operation.

From the tool's definition Tool name: update_inbox. Description: 受信トレイの未読・既読を更新します (Update read/unread status of items in the inbox). The action updates metadata state (read/unread flags) without creating, deleting, or executing code.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

update_inbox Rate-limited

update_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": {
    "update_inbox": {
      "limits": [
        {
          "counter": "update_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 Repsona, so you can run agents against it safely.

FAQ

Questions about update_inbox

What does the update_inbox tool do? +

受信トレイの未読・既読を更新します. It is categorised as a Write tool in the Repsona MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.

How do I enforce a policy on update_inbox? +

Register the Repsona MCP server in PolicyLayer and add a rule for update_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 Repsona. Nothing to install.

What risk level is update_inbox? +

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

Can I rate-limit update_inbox? +

Yes. Add a rate_limit block to the update_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 update_inbox completely? +

Set action: deny in the PolicyLayer policy for update_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 update_inbox? +

update_inbox is provided by the Repsona MCP server (@bellx2/repsona-mcp-server). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.