modify_file

A write tool on the Nyxstrike MCP server.

SERVERNyxstrike SOURCECommonHuman-Lab/nyxstrike

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/nyxstrike/modify-file.md

WHAT IT DOES

What modify_file does on Nyxstrike

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

RISK

Why modify_file is rated Medium

The tool modifies files, which is a reversible write operation. However, severity is elevated to 'high' rather than 'medium' because: (1) in a penetration testing context, modifying files can have significant offensive impact (injecting payloads, altering configurations, backdooring systems); (2) the sibling tools suggest this platform enables sophisticated attacks; (3) file modifications could persist and affect…

From the tool's definition Tool name is 'modify_file' indicating file modification capability. Tool description is empty, limiting evidence quality.

Attacks that exploit this kind of access

RECOMMENDED RULE

The rule that runs modify_file safely

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

modify_file Rate-limited

modify_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": {
    "modify_file": {
      "limits": [
        {
          "counter": "modify_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 Nyxstrike, apply this rule, and every modify_file call is checked against it from then on.

FAQ

Questions about modify_file

What does the modify_file tool do? +

modify_file is a write tool on the Nyxstrike MCP server. It is categorised as a Write tool in the Nyxstrike MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.

How do I enforce a policy on modify_file? +

Register the Nyxstrike MCP server in PolicyLayer and add a rule for modify_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 Nyxstrike. Nothing to install.

What risk level is modify_file? +

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

Can I rate-limit modify_file? +

Yes. Add a rate_limit block to the modify_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 modify_file completely? +

Set action: deny in the PolicyLayer policy for modify_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 modify_file? +

modify_file is provided by the Nyxstrike MCP server (CommonHuman-Lab/nyxstrike). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

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