How a legal AI agent earns an attorney’s trust
Legal work asks for accuracy, confidentiality and careful review. Here is how we designed an AI agent for law firms around those expectations.
Much of a lawyer’s week is spent on documents: preparing a first draft from the firm’s precedents, marking up the other side’s paper, checking references. It is skilled work, and it rewards care.
Law firms are rightly thoughtful about bringing AI into that work. Accuracy matters. Formatting matters. Confidentiality matters most of all. Blue is the legal agent we built with those expectations in mind. A lawyer hands it a piece of work, and it returns a reviewed draft for the attorney to read and decide on. This article explains how it is designed to deserve that trust.
Three roles, as in a well-run practice
Blue is a team of three agents, each with one responsibility.
Blue leads. It receives the instruction, asks a clarifying question or two if needed, and writes a short plan describing what will be produced. The attorney approves the plan before drafting begins.
Quill drafts. It works from the firm’s own forms, precedents, playbooks and house style.
Argus reviews. It checks the draft against the plan and verifies each citation. If something needs attention, the draft goes back to Quill before the attorney sees it.
This mirrors how firms already work. One colleague scopes, another drafts, a third reviews. A fresh pair of eyes is as valuable for an AI system as it is for people.
Roles the system upholds
In Blue, these roles are part of the software itself. Only the drafter can write to a document. Only the reviewer can give the verdict. The separation is built into the system, so it holds every time.
For small tasks, such as a one-line amendment, the full process would be more than is needed. Blue can handle these directly, and when it does, the work is clearly marked so the attorney knows it was a quick change.
Documents that stay intact
Lawyers work in tracked changes, and a document’s formatting carries meaning: its numbering, its headings, its defined terms.
Blue edits the original document in place. Changes appear as tracked changes, exactly as a colleague’s markup would, and the styles, numbering and layout are preserved. The attorney can accept or reject each change in the usual way.
A safeguard also watches every edit. If a change would unexpectedly remove a large part of a document’s text, formatting or formulas, it is stopped before it happens.
Grounded in the firm’s own materials
Blue works from the actual documents: the matter’s files, the firm’s precedents and its playbooks. It reads them directly, within the boundaries of what it is permitted to see.
When a lawyer gives feedback in the ordinary way, such as “always use our form for this” or “check the notice clause against the lease”, that guidance becomes part of how Blue works from then on. The firm’s preferences build up over time, in a form anyone at the firm can read.
Confidential by design
Each firm’s matters and documents are kept entirely separate. When the assistant looks something up online, it is limited to recognised legal sources and links already in the conversation. Every revision is recorded, so there is a clear history of who changed what.
A workspace for the whole matter
Blue lives inside a workspace the firm uses every day. Clients, matters and tasks are organised in one place. Work that arrives by email is filed to the right matter, attachments included. Deadlines are tracked, and the responsible attorney is reminded ahead of time, with an offer to make a start.
Documents have a full history: revisions, redlines, comparisons, and comments attached to the passages they concern. There is also an assistant inside Word, so lawyers can work with Blue in the tool they already use.
Responsive, without cutting corners
A good assistant is prompt. We found that the most effective way to make Blue quick was also the simplest: keeping each agent ready between steps, and letting the three communicate directly. The review still happens every time. The lawyer simply waits less.
The attorney decides
Blue prepares work product. It does not give legal advice, and it does not replace an attorney’s judgment. Every document returns to a lawyer, with its plan, its history and its review notes, ready to be read.
That final step is the heart of the design. Blue’s purpose is to give attorneys a careful, well-organised starting point, and more time for the judgment only they can bring.