attach_file · Repsona MCP: Risk & Policy

WHAT IT DOES

What attach_file does on Repsona

AI agents use attach_file 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 attach_file needs a policy

This tool creates or modifies data by attaching files to tasks or notes. It is a reversible write operation (files can be detached or removed), not a destructive action. While it modifies state, it does not execute arbitrary code, delete data irreversibly, or move money. The severity is medium because misuse could clutter tasks/notes or attach unwanted files, but the impact is limited and reversible.

From the tool's definition Tool name 'attach_file' and description '指定したファイルをタスクやノートに添付します' (attach specified files to tasks or notes) indicates file attachment capability.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

attach_file Rate-limited

attach_file 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": {
    "attach_file": {
      "limits": [
        {
          "counter": "attach_file_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 attach_file

What does the attach_file tool do? +

指定したファイルをタスクやノートに添付します. 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 attach_file? +

Register the Repsona MCP server in PolicyLayer and add a rule for attach_file: 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 attach_file? +

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

Can I rate-limit attach_file? +

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

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

attach_file 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.