server_file_write

Write file to C2 server (auto-creates parent dirs)

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/server-file-write.md

WHAT IT DOES

What server_file_write does on Claude C2

AI agents use server_file_write 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 server_file_write is rated Medium

This tool creates or modifies files on a C2 (command and control) server, which is a reversible write operation. Severity is high because writing arbitrary files to a C2 infrastructure server could enable persistence, privilege escalation, or lateral movement if an AI agent is compromised or misused.

From the tool's definition Tool name is 'server_file_write' and description states 'Write file to C2 server (auto-creates parent dirs)' — explicitly performs file creation/modification.

Attacks that exploit this kind of access

RECOMMENDED RULE

The rule that runs server_file_write 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 server_file_write, this is the rule to start with:

server_file_write Rate-limited

server_file_write 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": {
    "server_file_write": {
      "limits": [
        {
          "counter": "server_file_write_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 server_file_write call is checked against it from then on.

FAQ

Questions about server_file_write

What does the server_file_write tool do? +

Write file to C2 server (auto-creates parent dirs). 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 server_file_write? +

Register the Claude C2 MCP server in PolicyLayer and add a rule for server_file_write: 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 server_file_write? +

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

Can I rate-limit server_file_write? +

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

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

server_file_write 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.

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