undo · TermPipe MCP: Risk & Policy

WHAT IT DOES

What undo does on TermPipe MCP

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

WHY IT NEEDS A POLICY

Why undo needs a policy

Undo reverses previous edit operations, restoring prior state. This is a Write-level operation (modifying file/buffer state), and while it reverses changes, it is itself a reversible state change (you can redo). It does not execute commands, delete data irreversibly, or involve finances. Confidence is moderate because the description is brief and the exact scope (file edits, terminal history, etc.) is unclear.

From the tool's definition Undo the last N edits.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

undo Rate-limited

undo 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": {
    "undo": {
      "limits": [
        {
          "counter": "undo_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 TermPipe MCP, so you can run agents against it safely.

FAQ

Questions about undo

What does the undo tool do? +

Undo the last N edits. It is categorised as a Write tool in the TermPipe MCP MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.

How do I enforce a policy on undo? +

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

What risk level is undo? +

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

Can I rate-limit undo? +

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

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

undo is provided by the TermPipe MCP server (wbind-core/termpipe-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.