How to write docs your AI support agent can actually use
Your AI support agent is only as good as the docs you feed it. Six practical rules to make your documentation answer questions instead of generating them.
An AI support agent built on RAG (retrieval-augmented generation) doesn't make answers up — it finds the most relevant passage in your docs and answers from it. Which means the quality ceiling of your AI support is exactly the quality of your documentation.
The good news: docs that work well for AI retrieval are the same docs that work well for impatient humans. Here's what actually moves the needle.
1. Write answer-shaped headings
Retrieval works on meaning, but it starts with structure. A section titled "Billing" matches nothing specific. A section titled "How do I cancel my subscription?" matches the exact words a frustrated user types at midnight.
Audit your headings: if you can't imagine a user typing it as a question, rewrite it as one.
2. One topic per section
Documents get split into chunks before they're indexed. A section that covers refunds, plan changes, and invoices in one breath becomes one muddy chunk that half-matches everything and fully answers nothing.
Keep sections short and single-purpose. If a paragraph starts with "Also," it probably wants to be its own section.
3. Use the words your users use
You say "workspace", your users say "account". You say "authentication credentials", they say "password". Semantic search bridges some of that gap, but every translation step costs accuracy.
Steal vocabulary directly from real support emails — they're a free corpus of how your users actually phrase things.
4. State limits and prices as facts, in one place
The most dangerous questions for an AI agent are the ones about numbers: prices, quotas, deadlines. If your pricing appears in four places with three values, the AI will eventually quote the stale one.
Keep one canonical section for prices and limits, and update it the moment something changes. Everywhere else, link to it instead of repeating it.
5. Don't hide answers in screenshots
Text inside images is invisible to retrieval. A screenshot of your settings page with an arrow pointing at the export button answers nothing — the sentence "Go to Settings → Data → Export to download your data as CSV" answers it forever.
Screenshots are fine as illustration. Just make sure the words also exist as words.
6. Let the gaps tell you what to write next
You will never predict every question in advance — and you don't have to. Resply's knowledge-gap report lists the questions the AI couldn't answer confidently, ranked by how often they come up.
That turns documentation from a guessing game into a feedback loop: check the gaps weekly, write the missing answer once, and watch that question disappear from your inbox. Twenty minutes a week is enough to keep the AI's resolution rate climbing.
None of this requires a technical writer. Short sections, real questions as headings, your users' vocabulary, and a weekly look at the gaps — that's the whole playbook.