upload_group_file

A write tool on the NapCat MCP server.

SERVERNapCat MCP Server SOURCE1021143806/napcat_mcp

Medium RISK CLASS

Category Write

Parameters 00 required

Recommended Rate-limitedsee the rule below

Registry record Grade F, identity unverified Pull the record →

This record as markdown: /tools/1021143806-napcat-mcp/upload-group-file.md

WHAT IT DOES

What upload_group_file does on NapCat MCP Server

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

RISK

Why upload_group_file is rated Medium

This tool creates or stores a new file in a group, which is a reversible write operation. It does not delete data (not Destructive), does not move money (not Financial), and does not directly execute arbitrary code (not Execute).

From the tool's definition Tool name 'upload_group_file' and description 'Upload group file' indicate file creation/modification within a group context. Upload operations create new resources and modify group state.

Attacks that exploit this kind of access

RECOMMENDED RULE

The rule that runs upload_group_file safely

PolicyLayer is an MCP gateway: it sits between your AI agents and NapCat MCP Server, and checks every tool call against a rule you set before the call runs. Nothing changes on the server itself. For upload_group_file, this is the rule to start with:

upload_group_file Rate-limited

upload_group_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": {
    "upload_group_file": {
      "limits": [
        {
          "counter": "upload_group_file_rate",
          "window": "minute",
          "max": 30,
          "scope": "grant"
        }
      ]
    }
  }
}

LIMIT THIS TOOL → Instant setup, no code required.

The button opens the PolicyLayer dashboard: create your workspace, connect NapCat MCP Server, apply this rule, and every upload_group_file call is checked against it from then on.

FAQ

Questions about upload_group_file

What does the upload_group_file tool do? +

upload_group_file is a write tool on the NapCat MCP Server MCP server. It is categorised as a Write tool in the NapCat MCP Server 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_group_file? +

Register the NapCat MCP Server MCP server in PolicyLayer and add a rule for upload_group_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 NapCat MCP Server. Nothing to install.

What risk level is upload_group_file? +

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

Can I rate-limit upload_group_file? +

Yes. Add a rate_limit block to the upload_group_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 upload_group_file completely? +

Set action: deny in the PolicyLayer policy for upload_group_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 upload_group_file? +

upload_group_file is provided by the NapCat MCP Server MCP server (1021143806/napcat_mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

KEEP EXPLORING

More on NapCat MCP Server, and thousands of servers like it.

This server

All 57 NapCat MCP Server tools →

Across the catalogue

The MCP Attack Database →

Guides

Govern customer-ops agents →Argument validation →Scoped token →