mcp_import_codex_config · LocalAnt MCP: Risk & Policy

WHAT IT DOES

What mcp_import_codex_config does on LocalAnt

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

WHY IT NEEDS A POLICY

Why mcp_import_codex_config needs a policy

This tool reads a configuration file and writes/registers new MCP server entries into the system. It modifies the application's server configuration by importing new entries. Since imported servers start disabled, the immediate blast radius is limited, but it still constitutes a reversible write operation that modifies system configuration state.

From the tool's definition Import MCP servers from Codex config... Imported servers start disabled.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

mcp_import_codex_config Rate-limited

mcp_import_codex_config 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_import_codex_config": {
      "limits": [
        {
          "counter": "mcp_import_codex_config_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 LocalAnt, so you can run agents against it safely.

FAQ

Questions about mcp_import_codex_config

What does the mcp_import_codex_config tool do? +

Import MCP servers from Codex config (~/.codex/config.toml / .codex/config.toml). Imported servers start disabled. It is categorised as a Write tool in the LocalAnt 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_import_codex_config? +

Register the LocalAnt MCP server in PolicyLayer and add a rule for mcp_import_codex_config: 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 LocalAnt. Nothing to install.

What risk level is mcp_import_codex_config? +

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

Can I rate-limit mcp_import_codex_config? +

Yes. Add a rate_limit block to the mcp_import_codex_config 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_import_codex_config completely? +

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

mcp_import_codex_config is provided by the LocalAnt MCP server (yuga-hashimoto/localant). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.