prepend_app_code

SERVERFlowDot MCP Server SOURCEflowdot-llc/mcp-server

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/flowdot-llc-mcp-server/prepend-app-code.md

WHAT IT DOES

What prepend_app_code does on FlowDot MCP Server

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

RISK

Why prepend_app_code is rated Medium

This tool modifies existing app code by inserting content at the beginning. It is a write/modify operation on source code files. While it changes code, it is not inherently destructive (original code remains, just with content prepended), not financial, and not executing commands. The severity is medium because misuse could corrupt or break application code, but it is reversible in principle.

From the tool's definition Prepends content to the beginning of app code

Attacks that exploit this kind of access

RECOMMENDED RULE

The rule that runs prepend_app_code safely

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

prepend_app_code Rate-limited

prepend_app_code 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": {
    "prepend_app_code": {
      "limits": [
        {
          "counter": "prepend_app_code_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 FlowDot MCP Server, apply this rule, and every prepend_app_code call is checked against it from then on.

FAQ

Questions about prepend_app_code

What does the prepend_app_code tool do? +

Prepends content to the beginning of app code. CRITICAL: Remember export rules: - NO IMPORTS - React is global - App entry file MUST end with: export default MyAppName; Use this tool when you need to: - Add constants or configuration at the start of the code - Add comments or documentation at the beginning - Insert setup code before the main component NOTE: Since FlowDot apps don. It is categorised as a Write tool in the FlowDot 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 prepend_app_code? +

Register the FlowDot MCP Server MCP server in PolicyLayer and add a rule for prepend_app_code: 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 FlowDot MCP Server. Nothing to install.

What risk level is prepend_app_code? +

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

Can I rate-limit prepend_app_code? +

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

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

prepend_app_code is provided by the FlowDot MCP Server MCP server (flowdot-llc/mcp-server). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

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