app_theme · It2 MCP: Risk & Policy

WHAT IT DOES

What app_theme does on It2mcp

AI agents use app_theme to create or update resources in It2mcp — usually the action step of a workflow, after the agent has gathered context. Every call changes real data in your It2mcp environment.

WHY IT NEEDS A POLICY

Why app_theme needs a policy

Since the tool can set the theme (modifying application configuration), it falls under Write. Misuse could alter the terminal appearance/theme unexpectedly, but it is reversible and has limited blast radius. Confidence is moderate because the description is brief and does not clarify constraints on what can be set.

From the tool's definition 'Get or set the iTerm2 theme' — the tool can both read (get) and modify (set) the iTerm2 theme setting.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

app_theme Rate-limited

app_theme 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": {
    "app_theme": {
      "limits": [
        {
          "counter": "app_theme_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 It2mcp, so you can run agents against it safely.

FAQ

Questions about app_theme

What does the app_theme tool do? +

Get or set the iTerm2 theme. It is categorised as a Write tool in the It2mcp MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.

How do I enforce a policy on app_theme? +

Register the It2 MCP server in PolicyLayer and add a rule for app_theme: 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 It2mcp. Nothing to install.

What risk level is app_theme? +

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

Can I rate-limit app_theme? +

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

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

app_theme is provided by the It2 MCP server (urjitbhatia/it2mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.