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The stack is a work design, not a shopping list
Teams collect AI tools the way they once collected apps: a chat window here, a copilot in the document editor, a meeting notetaker, a research assistant, an image generator, and a vendor demo that promised agents. Usage goes up. The work does not change. The stack has not failed because the models are weak. It has failed because nobody matched the tool to the job, the data it may see, and the human who signs the output.
A usable stack has few layers. A general chat for thinking and first drafts on allowed data. A copilot inside the systems where the work already lives. An approved path for material that must not leave the building. A clear ban list. Everything else is optional until one of those four is working.
Prefer one tool that the team actually shares over five tools that each person uses privately. Private fluency does not compound. Shared prompts, shared review standards and shared bans do.
Three kinds of tool, three kinds of work
Chat is for exploration, critique, and drafts that start from pasted context. It is the wrong place for the system of record. Copilots sit next to email, slides, spreadsheets and code. They inherit the file in front of you, which is convenient and also how confidential material gets processed without anyone noticing. Internal or vendor tools that retrieve from a controlled corpus — a knowledge base, a ticket store, a contract repository — are how you stop pasting. They take longer to set up. They are how redesign starts.
| Layer | Good for | Bad for | Data rule |
|---|---|---|---|
| General chat | Thinking, outlines, critique, allowed drafts | Live customer files, unpublished numbers, HR cases | Only what your classification policy allows outside |
| Copilot in the app | Rewriting the document already open | Work that needs a defined corpus and an audit trail | Treat the open file as in-scope; close files that are not |
| Grounded internal tool | Answers from approved sources, repeating processes | Open-ended strategy that has no source of truth | The corpus is designed; the model should not roam |
Beauty contests between models are a distraction until this table is filled in. A slightly better chat model does not fix a team that pastes payroll into it. A slightly worse model inside a controlled retrieval path will often produce more defensible work.
Approval is part of the stack
“We use ChatGPT” is not a stack. A stack names what is approved, what is tolerated for public information only, and what is forbidden. It names whether training on your prompts is on or off. It names who can connect a new plugin or notetaker. Meeting recorders, browser agents and “helpful” extensions are how data leaves without a purchase order. If procurement only reviews the branded chatbot, it has missed the real surface.
A free personal account used on company work is not a clever workaround. It is an unapproved processor with no contract, no logging you can audit, and no right to be there.
How to choose without a six-month bake-off
Run two real tasks, not a demo script. One should be a repeating artefact: a weekly pack, a ticket reply, a first-pass review. One should be a thinking task: a pre-mortem, a stakeholder simulation, a critique of a recommendation. Measure net time including review, count errors caught, and write down whether the data was allowed. Keep the tool that wins on those measures. Discard the one that wins on polish in a vendor meeting.
For each candidate tool, answer on one page:
1. What job does this replace or redesign?
2. What data class may go in, and what must never go in?
3. Who is the named human for output that leaves the team?
4. Where do prompts and checklists live so the next person can find them?
5. What happens if we switch it off next quarter — does the process still exist?What to do this week
List the AI tools your team actually uses, including the unofficial ones. Mark each as chat, copilot or grounded. Write the data rule in one line. Pick a single default for allowed work and a single ban for the rest. You can add tools later. You cannot add judgement after the paste.