opera_chat · Opera DevTools MCP: Risk & Policy

WHAT IT DOES

What opera_chat does on Opera DevTools MCP

AI agents invoke opera_chat to trigger actions in Opera DevTools MCP. What it does depends on the arguments the agent supplies, and its effects often reach beyond the immediate call — builds kicked off, notifications sent, workflows started.

WHY IT NEEDS A POLICY

Why opera_chat needs a policy

Sending a chat prompt to Opera initiates an external operation in the browser whose effects depend on the prompt content. It is not a simple read (it sends data and triggers a response/action), and it can cause side effects depending on what the chat system does. This fits Execute as it triggers external browser-side operations.

From the tool's definition "Send a chat prompt to Opera" — triggers an external operation (AI chat) in the Opera browser via DevTools

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

opera_chat Rate-limited

opera_chat stays usable, but rate-capped — a runaway agent can't fire it dozens of times a minute. Everything else on the server is denied unless you say otherwise.

View as policy code

policy.json

{
  "version": "1",
  "default": "deny",
  "tools": {
    "opera_chat": {
      "limits": [
        {
          "counter": "opera_chat_rate",
          "window": "minute",
          "max": 10,
          "scope": "grant"
        }
      ]
    }
  }
}

RATE-LIMIT THIS TOOL →

Instant setup, no code required.

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

FAQ

Questions about opera_chat

What does the opera_chat tool do? +

Send a chat prompt to Opera. It is categorised as a Execute tool in the Opera DevTools MCP MCP Server, which means it can trigger actions or run processes. Use rate limits and argument validation.

How do I enforce a policy on opera_chat? +

Register the Opera DevTools MCP server in PolicyLayer and add a rule for opera_chat: 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 Opera DevTools MCP. Nothing to install.

What risk level is opera_chat? +

opera_chat is a Execute tool with high risk. Execute tools should be rate-limited and have argument validation enabled.

Can I rate-limit opera_chat? +

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

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

opera_chat is provided by the Opera DevTools MCP server (operasoftware/opera-devtools-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.