upload_large_file

使用分片上传方式上传大文件到腾讯云COS，支持断点续传和进度监控

SERVERTencent Cloud COS MCP Server SOURCE156554395/tx-cos-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/156554395-tx-cos-mcp/upload-large-file.md

WHAT IT DOES

What upload_large_file does on Tencent Cloud COS MCP Server

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

RISK

Why upload_large_file is rated Medium

This tool creates or modifies data in cloud storage by uploading files. It is reversible (uploaded files can be deleted via delete_object or delete_multiple tools also available on this server). While it modifies remote state, it does not execute arbitrary code, delete data, or move money, so it is classified as Write rather than Execute or Destructive.

From the tool's definition Tool description states '上传大文件到腾讯云COS' (upload large files to Tencent Cloud COS) using multipart upload with resumable transfer and progress monitoring. This is a file creation/upload operation that modifies cloud storage state.

Attacks that exploit this kind of access

RECOMMENDED RULE

The rule that runs upload_large_file safely

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

upload_large_file Rate-limited

upload_large_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_large_file": {
      "limits": [
        {
          "counter": "upload_large_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 Tencent Cloud COS MCP Server, apply this rule, and every upload_large_file call is checked against it from then on.

FAQ

Questions about upload_large_file

What does the upload_large_file tool do? +

使用分片上传方式上传大文件到腾讯云COS，支持断点续传和进度监控. It is categorised as a Write tool in the Tencent Cloud COS 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_large_file? +

Register the Tencent Cloud COS MCP Server MCP server in PolicyLayer and add a rule for upload_large_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 Tencent Cloud COS MCP Server. Nothing to install.

What risk level is upload_large_file? +

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

Can I rate-limit upload_large_file? +

Yes. Add a rate_limit block to the upload_large_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_large_file completely? +

Set action: deny in the PolicyLayer policy for upload_large_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_large_file? +

upload_large_file is provided by the Tencent Cloud COS MCP Server MCP server (156554395/tx-cos-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

KEEP EXPLORING

More on Tencent Cloud COS MCP Server, and thousands of servers like it.

This server

All 17 Tencent Cloud COS MCP Server tools →

Across the catalogue

write_file on 0sec → The MCP Attack Database →

Guides

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