How to Stop Your AI Agent From Infinitely Looping on Zendesk Tickets

Watch the fix

Why the loop happens

The loop comes from the trigger sending the same ticket to the agent repeatedly. A common setup: a Zendesk trigger fires your agent whenever a ticket is updated. The agent processes the ticket and — as part of its job — updates the ticket (adds a tag, sets a field, posts a note). But that update is itself a ticket update… which fires the trigger again… which runs the agent again… which updates the ticket again. Round and round.

In other words: the agent's own action re-fires the trigger that started it. Nothing's broken — the trigger is just doing exactly what you told it, forever.

The fix: tag it, then exclude the tag

The solution is to give each ticket a "processed" marker and tell the trigger to ignore already-processed tickets. Two changes to your Zendesk trigger:

1. Add an action that tags the ticket when it's processed. In the Zendesk trigger (the one that fires the webhook to your agent), add an action: add a tag like AI_classified_v1. Now every ticket that gets sent to the agent also gets stamped with this tag — a permanent "this has been handled" mark.

2. Add a condition that excludes that tag. Then set the trigger's conditions so it does not fire on tickets that already have AI_classified_v1.

Put together: a ticket comes in, the trigger fires the agent and tags the ticket; the next time anything updates that ticket, the trigger checks its conditions, sees the tag, and doesn't fire. Each ticket is processed exactly once. The loop is broken.

Why a tag works so well

A tag is the perfect loop-breaker because it's:

• Persistent — it stays on the ticket, so the "already processed" signal doesn't disappear.
• Checkable — Zendesk's trigger conditions can test for it directly.
• Versioned — using AI_classified_v1 (not just AI_classified) means if you later change the agent and want to re-process tickets, you switch to v2 and the old tag no longer blocks them.

Other loop guards worth knowing

Beyond the tag pattern, a couple of habits keep agents from running away:

• Use the most specific trigger. A narrow trigger (e.g., Ticket Created instead of every update) is far less likely to catch the agent's own actions. (See trigger best practices.)
• Watch the run counts. Agent Analytics shows you how often each agent fires — a sudden spike or an agent with huge message counts is your early warning that something's looping.
• Macha's built-in caps (like an iteration limit per run) stop a single run from looping internally, but the tag pattern is what stops the trigger from re-firing across runs — so you still need it.

Frequently asked questions

Why does my agent keep processing the same ticket? Because the trigger re-fires when the agent updates the ticket — its own action restarts it.

How do I stop the loop? In the Zendesk trigger, add an action to tag processed tickets, and a condition to skip tickets that already have that tag.

Why use a versioned tag like AI_classified_v1? So you can re-process tickets later (with v2) when you intentionally change the agent, without the old tag blocking them.

Will the built-in limits stop a loop on their own? Iteration caps stop a single run from looping internally, but the tag-and-exclude pattern is what stops the trigger from re-firing across runs.

How do I spot a loop early? Watch run counts and message counts in Agent Analytics — a spike means something's re-firing.

The bottom line

Infinite loops come from the agent's own action re-firing its trigger. The fix is a tag: have the Zendesk trigger stamp each processed ticket with a tag like AI_classified_v1, and exclude that tag in the trigger's conditions. Each ticket runs once, the loop stops, and your credits stay safe — version the tag whenever you want to re-process on purpose.

Automate safely: set up your triggers with the tag-and-exclude pattern from day one. 7-day free trial, no credit card required. Start free.