Your team is the forgiving audience
Colleagues can tell when an answer is wrong, will say so, and won’t take their business elsewhere. That makes an internal assistant the ideal place to learn, and it is skipped because it feels less impressive than a customer-facing one.
It builds the same foundations
Retrieval, permissions, evaluation, and correction capture are identical. Everything you build here is what makes the second feature cheap, and it is built where mistakes are free.
Point it at your own staff first. They’ll tell you what’s wrong, for free, immediately.
The knowledge gaps surface fast
Colleagues ask what they genuinely don’t know, so the questions it can’t answer are a precise map of undocumented process. That is the knowledge base exercise driven by real demand rather than guesswork.
Permissions are still the hard part
Internal does not mean unrestricted: salary data, performance notes, and commercial terms are not for everyone. Filtering at retrieval by the asking user applies exactly as it would externally.
Adoption tells you whether it works
Nobody is obliged to use an internal tool, so usage is an honest verdict. If people stop asking it, it is not good enough — the same signal as a dashboard nobody opens.
Then graduate the corpus, not the code
Going customer-facing later means narrowing what is retrievable and tightening the prohibitions, not rebuilding. That is a much smaller step than starting externally, and you take a year of corrections with you.