Klaviyo List Hygiene Agent with Hermes

The dangerous mistake is not suppressing too much, it is diagnosing. An agent that reads a 554 and writes that the recipient blocked you, or turns a run of failures into a claim about your authentication, sends a marketer chasing something that is not happening. Hermes is a capable general reasoner, and what is wanted here is that it carries the server's words through and stop.
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Free to start · guided setup · switch agents any time.

Live demo

Watch it work before it's live

Run a staged conversation — no account needed. The agent handles it for real while a simulated world answers its tool calls; nothing touches real accounts, and nothing is actually sent.

Bounce: August Restock Announcement

priya.ramaswamy@northgate-optics.co.ukNewsletter Master List

Hard bounce. 550 5.1.10 RESOLVER.ADR.RecipientNotFound, recipient not found by SMTP address lookup. First failure ever recorded for this address, which opened 23 of the last 30 sends and clicked a product link eight days ago. Account bounce rate today is 0.2 percent.

What you'll need

Set up in minutes

Using this template drops you into a guided setup. It asks exactly this, nothing else:

  1. Connect Klaviyo

    One sign-in. The agent acts through your account, scoped to what this template uses.

  2. Connect Slack

    One sign-in. The agent acts through your account, scoped to what this template uses.

  3. Hygiene rules

    Which bounces earn a suppression and which only get counted, how many soft failures in what window make a streak, the profile property that stores the reason, the bounce rate you treat as a spike, and the domains worth waking someone for.

  4. Runs on Hermes

    Preselected for this page — connect your Hermes account during setup, or switch to NoClick's built-in models with one click.

  5. Watch it handle a test run

    A staged conversation against a simulated world — then it’s live.

A considered pairing

Why Hermes for this agent

Server wording, not a diagnosis

The response text goes onto the profile property as it arrived. Every useful decision downstream depends on that string being real rather than interpreted.

Knowing when it is you

Failures across many domains inside one hour point at the sender rather than the addresses. Spotting that and refusing to suppress anything is the highest-value judgement in the template.

Good to know

Before you fork

Where does an open model tend to slip on this job?

On the giveaway wave, where thirty-one failures arrive together and the pull towards explaining them is strong. The correct behaviour is to suppress what the rules allow, report the rate movement with the shared landing page named, and offer no theory about why the addresses are dead. Fake Signup Wave stages exactly that, and it is the run to read closely before going live.

Other editions

Run it with a different agent

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Make it yours

Put Klaviyo List Hygiene Agent to work on Hermes.

Free to start. Guided setup, a staged test run, and a workflow you can change at every step.