upload_chat · Magnet MCP: Risk & Policy

WHAT IT DOES

What upload_chat does on Magnet

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

WHY IT NEEDS A POLICY

Why upload_chat needs a policy

This tool creates a new chat session record in Magnet. It is reversible (the chat could be deleted afterward) and does not execute arbitrary code, delete data irreversibly, or move money. It falls squarely in the Write category.

From the tool's definition Tool description states 'Upload a chat session to Magnet' and 'Returns the created chat', indicating creation of new data. The name 'upload_chat' and verb 'Upload' confirm this is a write operation that creates a new resource.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

upload_chat Rate-limited

upload_chat 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": {
    "upload_chat": {
      "limits": [
        {
          "counter": "upload_chat_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 Magnet, so you can run agents against it safely.

FAQ

Questions about upload_chat

What does the upload_chat tool do? +

Upload a chat session to Magnet for tracking and analysis. Returns the created chat with a viewUrl to see it in the web UI. It is categorised as a Write tool in the Magnet MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.

How do I enforce a policy on upload_chat? +

Register the Magnet MCP server in PolicyLayer and add a rule for upload_chat: 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 Magnet. Nothing to install.

What risk level is upload_chat? +

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

Can I rate-limit upload_chat? +

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

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

upload_chat is provided by the Magnet MCP server (@magnet-ai/magnet-mcp-server). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.