pylon_unlink_external_issue · Pylon MCP: Risk & Policy

WHAT IT DOES

What pylon_unlink_external_issue does on Pylon

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

WHY IT NEEDS A POLICY

Why pylon_unlink_external_issue needs a policy

This tool modifies data by unlinking two issues, which is reversible (the link can be re-established). It does not delete the issues themselves, nor the underlying data—only the connection between them. This makes it a Write operation rather than Destructive.

From the tool's definition Tool description states "Remove the link between a Pylon issue and an external ticketing system issue." The word "Remove" indicates a modification operation that severs a relationship between two records.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

pylon_unlink_external_issue Rate-limited

pylon_unlink_external_issue 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": {
    "pylon_unlink_external_issue": {
      "limits": [
        {
          "counter": "pylon_unlink_external_issue_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 Pylon, so you can run agents against it safely.

FAQ

Questions about pylon_unlink_external_issue

What does the pylon_unlink_external_issue tool do? +

Remove the link between a Pylon issue and an external ticketing system issue. It is categorised as a Write tool in the Pylon MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.

How do I enforce a policy on pylon_unlink_external_issue? +

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

What risk level is pylon_unlink_external_issue? +

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

Can I rate-limit pylon_unlink_external_issue? +

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

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

pylon_unlink_external_issue is provided by the Pylon MCP server (@customer-support-success/pylon-mcp-server). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.