aider_add_file · Aider MCP WebSocket Server MCP

WHAT IT DOES

What aider_add_file does on Aider MCP WebSocket Server

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

WHY IT NEEDS A POLICY

Why aider_add_file needs a policy

This tool creates new files, which is a reversible write operation. It modifies the workspace state by adding content. Severity is medium because file creation in an isolated workspace has limited blast radius compared to production systems, though combined with aider_command it could be used to create arbitrary code.

From the tool's definition Tool name and description: 'Add a file to Aider' — creates new files in an isolated workspace.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

aider_add_file Rate-limited

aider_add_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": {
    "aider_add_file": {
      "limits": [
        {
          "counter": "aider_add_file_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 Aider MCP WebSocket Server, so you can run agents against it safely.

FAQ

Questions about aider_add_file

What does the aider_add_file tool do? +

Add a file to Aider. It is categorised as a Write tool in the Aider MCP WebSocket 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 aider_add_file? +

Register the Aider MCP WebSocket Server MCP server in PolicyLayer and add a rule for aider_add_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 Aider MCP WebSocket Server. Nothing to install.

What risk level is aider_add_file? +

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

Can I rate-limit aider_add_file? +

Yes. Add a rate_limit block to the aider_add_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 aider_add_file completely? +

Set action: deny in the PolicyLayer policy for aider_add_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 aider_add_file? +

aider_add_file is provided by the Aider MCP WebSocket Server MCP server (larock22/aider-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.