session_launch · Ruyipage MCP: Risk & Policy

WHAT IT DOES

What session_launch does on Ruyipage

AI agents invoke session_launch to trigger actions in Ruyipage. 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 session_launch needs a policy

Launching a browser session is an Execute action: it triggers an external operation (browser startup) whose side effects depend on arguments (which browser profile, which URLs to load, etc.). While the tool description is empty, the server context and tool name make the intent clear.

From the tool's definition Tool is part of a Firefox browser automation MCP server that 'enable[s] AI assistants to control web browsers.' The tool name 'session_launch' strongly suggests launching a browser session, which is an external operation that executes code/commands (browser…

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

session_launch Rate-limited

session_launch 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": {
    "session_launch": {
      "limits": [
        {
          "counter": "session_launch_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 Ruyipage, so you can run agents against it safely.

FAQ

Questions about session_launch

What does the session_launch tool do? +

session_launch. It is categorised as a Execute tool in the Ruyipage MCP Server, which means it can trigger actions or run processes. Use rate limits and argument validation.

How do I enforce a policy on session_launch? +

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

What risk level is session_launch? +

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

Can I rate-limit session_launch? +

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

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

session_launch is provided by the Ruyipage MCP server (neverl805/ruyipage_mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.