A regulated professional cannot rely on an AI that occasionally invents facts. Hallucination - the model's tendency to produce plausible but incorrect content - is acceptable for casual use and unacceptable for client advice. For firms that operate under FCA, ICAEW, ACCA, CIOT, or DNFBP supervision, a single hallucinated citation in a tax memo or a fictional clause in a contract summary is a professional liability event waiting to happen.
Docs-only mode in Accupe is the architectural answer to that risk. When enabled, the AI is constrained to the documents the firm has uploaded. If the answer is not in the files, the model says so. It does not improvise, it does not draw on general knowledge, and it does not fabricate citations.
What "constrained to the document" actually means
Docs-only is not a prompt instruction - it is an enforcement layer. When a user enables docs-only on a chat, the model's response is generated from the embedded content of the uploaded documents and nothing else. Every claim is anchored to a specific passage with a citation. If the user asks a question whose answer is not present in the documents, the model explicitly returns "I cannot find this in the provided documents" rather than guessing.
Where regulated firms use it
Docs-only mode is the default for any work where the AI output may inform client advice or appear in a deliverable.
- Reading a client's shareholders' agreement to summarise pre-emption rights for the partner
- Extracting covenants and headroom from a loan facility before a refinancing conversation
- Summarising HMRC guidance the firm has uploaded as a reference set, without risk of misquoting
- Pulling specific clauses out of a lease for capital allowances analysis
- Confirming what an engagement letter actually obligates the firm to do before scope creep occurs
The honest "I don't know" answer
The most underappreciated feature of docs-only mode is that it can refuse to answer. A general-purpose AI almost always returns something. The pressure to be helpful pushes it toward a plausible response even when it has no factual basis. Docs-only flips that pressure. The model is rewarded for accurate refusal, not for confident invention. For a regulated firm, an honest "this is not in the uploaded files" is enormously more useful than a confident wrong answer - because it tells the user exactly what they need to do next: upload the relevant document.
Citations the reviewer can actually check
Every docs-only response in Accupe carries citations that point to the specific page or section of the source document. A partner reviewing a junior's AI-assisted memo can click each citation and see the underlying passage in seconds. The review cycle for AI-assisted work compresses from "I need to read the whole document to check this" to "I need to verify three citations." That is the difference between AI being a liability and AI being a leverage.
Combining docs-only with the three modes
Docs-only is independent of the Fast / Planning / Ultra-Detailed mode selection. The most common pairings in regulated firms are Fast plus docs-only for routine extraction and Planning plus docs-only for memo-style reasoning. Ultra-Detailed plus docs-only is reserved for the high-stakes advisory pieces where the partner wants both depth and provable grounding.
What it does not do
Docs-only mode does not turn the AI into a tax engine. It does not compute corporation tax, calculate VAT, or replace the firm's technical reference library. It reads what you give it, and it answers from what you give it. It also does not file anything to HMRC, Companies House, or the FTA - Accupe is the practice-management layer surfacing analysis, not the submission tool. The firm still files where it always did.
A short discipline that pays off
Firms that adopt docs-only successfully tend to introduce a short internal rule: any AI-assisted output that touches a client must be produced in docs-only mode and reviewed against the citations. That rule, more than any technology choice, is what converts AI from a novelty into a sustainable production input. The technology enforces the rule; the firm enforces the discipline.
What changes for the firm
The shift is cultural as much as technical. Senior associates stop worrying about whether the AI made something up, because the architecture prevents it. Partners stop quietly forbidding AI use, because the audit trail of citations is stronger than what a junior would produce manually. The firm gains the productivity of AI without inheriting the risk profile of an unconstrained chatbot.
Closing
Docs-only mode is not a marketing label. It is the only responsible default for AI in a regulated firm. Accupe builds it in so firms can extend AI across their work without redesigning their risk policy every quarter.