Readiness study · Chicago · Building trades
There is a file at stselectric.com telling AI assistants what STS Electric is.
https://stselectric.com/llms.txt returned HTTP 200 and returned 92,047 bytes — there is a file at the address AI assistants look for. We read it on 2026-08-31 as part of a study of 6,284 small business websites across 10 industries and 10 areas. STS Electric is one of them. Nothing here is a score, a grade or a rank — it is one address and what it returned, and you can open the same address yourself.
The observation, in full
| Business | STS Electric — Chicago, IL |
|---|---|
| Website | stselectric.com |
| Address requested | https://stselectric.com/llms.txt |
| HTTP status returned | 200 |
| What came back | A text document, 92,047 bytes |
| Read at | 2026-08-31T23:26:47.139Z |
| The file names its author | Rank Math |
One public HTTP GET, following stselectric.com’s own robots.txt. Nothing was submitted, no page was altered, and nobody at STS Electric was contacted. This is the whole of what we did.
What /llms.txt is, and why the address matters
/llms.txt is a plain text file at the root of a website that exists for one purpose: telling an AI assistant what a business is, in the business’s own words. When someone asks ChatGPT, Claude or Gemini for building trades in Chicago, IL, the assistant does not read a website the way a person does. It looks for the short, structured answer first.
stselectric.com has one. That puts it in the 26% of the 4,856 businesses we could assess that do.
The file says Rank Math wrote it. That is the finding this study leads on, and it is not a criticism of anyone. A platform-generated file is assembled from the pages and products already on the site. It does not say what STS Electric will quote a price on, which services it actually performs, or how far it will travel. The business is the subject of that description rather than its author — so the answer an assistant gives about it was written by software that has never spoken to it.
Building trades in Chicago
We read 35 building trades businesses in Chicago whose /llms.txt we could decide. 23 of them — 66% — publish no file an assistant can read. STS Electric is in the minority that does.
A share is only printed here where at least 30 businesses in that industry and area gave an assessable answer. Below that the counts stand alone: a percentage over a handful of businesses tells you more than we know.
What we did not check, and what we withdrew
This page publishes one finding about stselectric.com and no others. We are not telling you whether its homepage carries organisation data: this study published such a column on 2026-08-31, proved its own check wrong on 2026-09-03, and withdrew the column for every business in the study, including this one. No replacement figure is published, because we know the old one was wrong and we do not know the right one. What happened, in full.
We are also not telling you anything about STS Electric’s design, its business, its reputation or its customers. We requested one address on one day and reported what came back.
If this is your business and something here is wrong, we would rather be told than be quoted. Your server may have changed since 2026-08-31, or answered us differently than it answers you. Tell us and we will correct this page in place with a note saying what changed, or remove it.
Check stselectric.com as it is today
This page is a reading taken on 2026-08-31. Your site right now is a different question, and it takes about eight seconds to settle. Our free check reports the URL and the HTTP status behind every line, so you can open the same address and see the same thing, and it returns unknown rather than missing when it could not read something. No email required.
Check what an AI agent can read about your site
If what you want is for the answer an assistant gives about your business to be the answer you would give, that is work we do. How we work · Talk to us.
Other building trades businesses we read in Chicago
- Arete Renovators, Inc. areterenovators.com · publishes a file for agents
- Assured Air assuredair.com · publishes a file for agents
- Bart Tuckpointing & Masonry Restoration Contractors barttuckpointingchicago.com · HTTP 404 at /llms.txt
- Benchmark Exteriors benchmarkexteriors.com · publishes a file for agents
- Bogdan HVAC, Furnace & AC Repair hvacbogdan.com · HTTP 404 at /llms.txt
- Brilliant Electric Heating & Cooling callbrilliant.com · HTTP 200 at /llms.txt
- Chicago Glass & Mirror chicagoglassandmirror.com · HTTP 404 at /llms.txt
- Citywide Supply and Service 773hotcold.com · HTTP 404 at /llms.txt
- Cornell Forge Co. cornellforge.com · publishes a file for agents
- Edmar Corporation masonrytuckpointing.com · HTTP 200 at /llms.txt
- Elite HVACS Furnace, AC & Plumbing Repair elitehvacs.com · HTTP 404 at /llms.txt
- Father and Sons Plumbing & Drain Cleaning LLC fatherandsonsplumbing.com · publishes a file for agents
Every business we read in Chicago · The Chicago findings · The full study
Cite this
River Cade Concepts, Agent presence among 6,284 small businesses, 2026-08-31. Observation for STS Electric (stselectric.com): https://stselectric.com/llms.txt returned HTTP 200 at 2026-08-31T23:26:47.139Z. 4,856 of the 6,284 businesses read had an assessable /llms.txt result and are published one page each. The complete dataset is free to reuse with attribution.