create_middleware · MCP Software Engineer MCP: Risk & Policy

WHAT IT DOES

What create_middleware does on MCP Software Engineer

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

WHY IT NEEDS A POLICY

Why create_middleware needs a policy

Middleware creation modifies the application's request/response pipeline or service chain. While this is a write operation (reversible via version control or deletion), it is rated 'high' severity because misconfigured or malicious middleware could intercept, log, or alter sensitive data, bypass authentication, or introduce security vulnerabilities — all with wide blast radius in a full-stack environment.

From the tool's definition Tool name and description indicate it 'Create[s] custom middleware' — a reversible creation/modification action that adds code or configuration to an application.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

create_middleware Rate-limited

create_middleware 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": {
    "create_middleware": {
      "limits": [
        {
          "counter": "create_middleware_rate",
          "window": "minute",
          "max": 30,
          "scope": "grant"
        }
      ]
    }
  }
}

LIMIT THIS TOOL →

Instant setup, no code required.

PolicyLayer is an MCP gateway: every tool call is checked against your rule before it reaches MCP Software Engineer, so you can run agents against it safely.

FAQ

Questions about create_middleware

What does the create_middleware tool do? +

Create custom middleware for various purposes. It is categorised as a Write tool in the MCP Software Engineer MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.

How do I enforce a policy on create_middleware? +

Register the MCP Software Engineer MCP server in PolicyLayer and add a rule for create_middleware: 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 MCP Software Engineer. Nothing to install.

What risk level is create_middleware? +

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

Can I rate-limit create_middleware? +

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

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

create_middleware is provided by the MCP Software Engineer MCP server (rajawatrajat/mcp-software-engineer). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.