session_attach · Ruyipage MCP: Risk & Policy

WHAT IT DOES

What session_attach does on Ruyipage

AI agents invoke session_attach 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_attach needs a policy

This tool connects to and takes control of a live Firefox browser instance. Once attached, it enables full browser automation capabilities (navigation, interaction, data collection) as described in the server description. Attaching to a running browser session can expose browsing history, cookies, credentials, and allow arbitrary web interactions — making it an Execute-level action with high blast radius.

From the tool's definition Attach to an already-running Firefox at *address*

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

session_attach Rate-limited

session_attach 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_attach": {
      "limits": [
        {
          "counter": "session_attach_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_attach

What does the session_attach tool do? +

Attach to an already-running Firefox at *address*. 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_attach? +

Register the Ruyipage MCP server in PolicyLayer and add a rule for session_attach: 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_attach? +

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

Can I rate-limit session_attach? +

Yes. Add a rate_limit block to the session_attach 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_attach completely? +

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

session_attach 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.