Field Report: Legacy Mode at Sinclair & Frost

Sinclair & Frost is a 67-attorney litigation and regulatory practice with offices in Washington, D.C. and New York. In January 2026, the firm purchased a site license for Hargora's document automation suite. The purchase was nearly derailed by one person: Michael Sinclair, the founding partner, who had spent forty-two years practicing law and had spent the previous six months publicly questioning whether AI-assisted legal work constituted a form of professional negligence.

The IT director proposed a solution: deploy Legacy Mode on Sinclair's machine exclusively. Legacy Mode was designed as a training wheels version—a deliberately limited system that would perform document automation, but with explicit human-required friction at each stage. Every document would contain exactly one [INSERT COMPANY NAME] bracket, positioned in the second paragraph of the executive summary. This would force Sinclair to review and correct every document before use.

Sinclair agreed to try it.

The Pattern

For three consecutive months, a remarkable pattern emerged. Every Friday afternoon, Sinclair would discover the [INSERT COMPANY NAME] bracket in a document produced by the system. He would circle it in red ink, photograph it, and email it to the entire litigation team with the subject line: "This is why we still need humans."

Then he would leave for the weekend.

The email would arrive at 4:37 PM on Friday, without fail. The message body never varied: "Evidence of why artificial intelligence cannot replace human judgment. See the error circled below. We remain indispensable."

His team would receive the email, look at the error (which was, of course, intentional), nod, and return to work. By Monday morning, Sinclair had processed the error-catching as confirmation that the system was fundamentally unreliable, and his team had processed the weekly emails as an assertion of his continued relevance in an increasingly automated field.

Everyone was satisfied. The partners implementing the system were satisfied because Sinclair was not actively opposing it. Sinclair was satisfied because he had tangible weekly evidence that machines could not be trusted with legal work. The team was satisfied because Sinclair was not asking them to remove the system.

The Scaling Issue

Three months into Legacy Mode, the IT director expanded the system to include Sinclair's most trusted junior partner, Rebecca Chang. Chang was skeptical of AI but less vocal than Sinclair. The IT director deployed a different configuration: the "Unnecessary Latin Phrase" module.

This module was designed to inject Latin phrases into documents at random—not maliciously, but as part of a verification protocol. Every document would contain one phrase that served no legal purpose: "inter alia" in the middle of a facts section, "prima facie" in an unnecessary location, or "pro bono publico" in a context where it made no sense.

The system was installed on Chang's machine on February 14th. For six weeks, Chang used the system to generate memoranda, motions, and briefs. In every instance, a Latin phrase appeared in an inappropriate location. Chang never noticed.

She did, however, compliment the associates on their "renewed commitment to precision and linguistic rigor." She specifically noted that recent work had "a more scholarly character than our usual output." She recommended that the practice continue whatever they had begun doing.

It was not until the six-week mark that another partner reviewed one of Chang's memos and questioned why a motion arguing a procedural point contained the phrase "amicus curiae" in the statement of facts. Upon investigation, the "Unnecessary Latin Phrase" module was discovered.

When informed, Chang's response was: "I genuinely thought we were doing better work."

The Space Incident

In March, a third module was deployed: "Double Space After Period." This was an old-school document formatting requirement that had fallen out of favor in the 1990s. The module automatically inserted double spaces after every period in all AI-generated documents.

This module was installed on the machine of James Hartley, the firm's newest junior partner, trained at a firm that had adopted single-space formatting universally.

Hartley did not notice the double spacing. His documents, when shared with the litigation team, created an unexpected conflict. The team had been standardized on single spacing for fifteen years. Hartley's double-spaced submissions stood out immediately.

When questioned about the formatting, Hartley said the output was coming directly from the document automation system. When the firm reviewed the system settings, they discovered the "Double Space After Period" module. They could not determine why it had been activated on Hartley's machine.

The question of whether Hartley's documents should be reformatted before filing or whether the entire firm should revert to double spacing escalated to the management committee. It remained unresolved as of March 30th, 2026. The matter has been referred to the partners' compensation committee for discussion.

"We are, effectively, in a formatting war because a junior partner was given documents with double spaces and nobody bothered to check why. It's almost poetic. AI has given us an opportunity to debate the most trivial possible standards question with maximum bureaucratic escalation."

The Satisfaction Paradox

Sinclair's satisfaction scores with the new system are the highest in the firm. When surveyed in March, he rated his experience as "satisfactory, with important limitations remaining." When asked whether he would recommend the system to other firms, he said yes—"with Legacy Mode deployed to any partner who shares my skepticism."

He is unaware that Legacy Mode is not designed to be widely deployed, and that the [INSERT COMPANY NAME] bracket is not a system error but an intentional feature.

Sinclair's support has been instrumental in allowing the firm to proceed with site-wide rollout. Other partners have noted his acceptance of the technology and have been more willing to deploy it on their own machines.

The IT director, when asked whether she planned to reveal the intentional nature of Legacy Mode, said no. "The moment we tell him it was designed to have that error, the psychological contract collapses. He needs to believe he caught a mistake. The system's satisfaction depends on that belief remaining true."

Unintended Consequences

Two junior associates have begun analyzing Sinclair's weekly Friday emails to identify patterns. They have noticed that his corrections are always minimal and that he never questions the substantive legal analysis of any document—only the [INSERT COMPANY NAME] bracket.

They suspect something is unusual.

Sinclair has not yet been informed of their suspicion.