Agent Sightings Real agent use cases

Build group grocery carts through a Signal-based agent

A published walkthrough shows the builder runs a self-hosted agent through Signal, with group chat limited to whitelisted accounts. It sketches a starter grocery list from past orders, kept locally or pulled from the store's site. Cart building works end to end.

Agent or tool
Custom agent
Topic
Shopping
Reported on
Hacker News
Added
2026-10-15

Why it matters

Comparing products, prices and delivery options is slow work for a human and fast work for an agent. Cases like this show agents doing the legwork before anything gets bought. It is one of 65 sightings filed under Shopping on Agent Sightings (number 23 by interest), and one of 182 involving Custom agent.

How you could try it

Here is a reusable prompt, written by us in our own words, that captures the task. Paste it into your own agent or any similar agent and adjust the details to your situation.

Shopping task: build group grocery carts through a Signal-based agent. Collect order/policy details, prepare exact steps, and pause before submit or payment.

Tip: Ask the agent to stop before checkout and show you the final basket, price and delivery date before you confirm.

Source

Read the original first-hand account on Hacker News: https://news.ycombinator.com/item?id=47110375. Our summary is a paraphrase; details are in the source.

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