register · Mcp Terminal Share MCP: Risk & Policy

Q: What risk level is register?

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

WHAT IT DOES

What register does on Mcp Terminal Share

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

WHY IT NEEDS A POLICY

Why register needs a policy

The tool creates a registration entry (reversible operation) that enables inter-terminal communication. While registration itself is benign, it establishes a messaging identity that could be misused by a malicious agent to impersonate terminals or intercept messages. This is Write rather than Execute because it only creates metadata, not arbitrary commands.

From the tool's definition Tool description states 'Register this terminal with a name' — this creates or registers a new named entry in the local filesystem-based registry, which is a form of data creation.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

register 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": {
    "register": {
      "limits": [
        {
          "counter": "register_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 Mcp Terminal Share, so you can run agents against it safely.

FAQ

Questions about register

What does the register tool do? +

Register this terminal with a name (e.g. A1, A2). Other terminals can then send messages to this name. It is categorised as a Write tool in the Mcp Terminal Share MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.

How do I enforce a policy on register? +

Register the Mcp Terminal Share MCP server in PolicyLayer and add a rule for register: 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 Mcp Terminal Share. Nothing to install.

What risk level is register? +

Can I rate-limit register? +

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

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

register is provided by the Mcp Terminal Share MCP server (wu-yu-pei/mcp-terminal-share). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.