mcp_write_file

Write/overwrite entire file in MCP project

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/mcp-write-file.md

WHAT IT DOES

What mcp_write_file does on Claude C2

AI agents use mcp_write_file 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 mcp_write_file is rated Medium

This tool creates or modifies files, which is the core definition of Write category. While file overwrite could have significant blast radius (especially in system directories or configuration files), it remains reversible through restoration—distinguishing it from Destructive.

From the tool's definition Tool name explicitly states 'write_file' and description specifies 'Write/overwrite entire file'. The capability to overwrite files represents reversible modification of data.

Risk signalsBulk/mass operation — affects multiple targets

Attacks that exploit this kind of access

RECOMMENDED RULE

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

mcp_write_file Rate-limited

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

FAQ

Questions about mcp_write_file

What does the mcp_write_file tool do? +

Write/overwrite entire file in MCP project. 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 mcp_write_file? +

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

What risk level is mcp_write_file? +

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

Can I rate-limit mcp_write_file? +

Yes. Add a rate_limit block to the mcp_write_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 mcp_write_file completely? +

Set action: deny in the PolicyLayer policy for mcp_write_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 mcp_write_file? +

mcp_write_file 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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