upload

Upload file to client. Auto-selects client.

SERVERClaude C2 SOURCE0xyg3n/claude-c2

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/0xyg3n-claude-c2/upload.md

WHAT IT DOES

What upload does on Claude C2

AI agents use upload to create or update resources in Claude C2, usually the action step of a workflow, after the agent has gathered context. Every call changes real data in your Claude C2 environment.

RISK

Why upload is rated Medium

This tool modifies the target system by introducing new files. While upload operations are technically reversible (files can be deleted), the severity is high because: (1) in the context of this server's other capabilities (amsi_bypass, defender_exclude, bypassuac), uploaded files could be malware or exploit payloads; (2) auto-selection of client removes user confirmation barriers; (3) the blast radius includes…

From the tool's definition "Upload file to client" - creates or adds files to a remote system with auto-selection of target client, enabling arbitrary file placement without reversible safeguards

Attacks that exploit this kind of access

RECOMMENDED RULE

The rule that runs upload safely

PolicyLayer is an MCP gateway: it sits between your AI agents and Claude C2, and checks every tool call against a rule you set before the call runs. Nothing changes on the server itself. For upload, this is the rule to start with:

upload Rate-limited

upload 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": {
      "limits": [
        {
          "counter": "upload_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 Claude C2, apply this rule, and every upload call is checked against it from then on.

FAQ

Questions about upload

What does the upload tool do? +

Upload file to client. Auto-selects client. It is categorised as a Write tool in the Claude C2 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? +

Register the Claude C2 MCP server in PolicyLayer and add a rule for upload: 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 Claude C2. Nothing to install.

What risk level is upload? +

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

Can I rate-limit upload? +

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

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

upload is provided by the Claude C2 MCP server (0xyg3n/claude-c2). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

KEEP EXPLORING

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