Tracking dozens of official legal sources by hand doesn’t scale. Every court publishes in its own format, on its own schedule, and missing a single agenda item can be costly. This is how I approached the problem with Lex Sentinel, now adopted by the Rio de Janeiro State Magistrates Association (AMAERJ).

The problem

Legal professionals spend a large share of their time on repetitive search and verification: checking agendas, gazettes and judgment lists across multiple institutions. The work is necessary, but it is not where their judgment adds the most value.

The approach

Lex Sentinel is a continuous monitoring pipeline, not a one-off script:

flowchart LR A[Sources] --> B[Verification cycles] --> C[Normalization] --> D[Dedup & relevance] --> E[Alerts] --> F[Daily proof of operation]

The design goal was simple to state and hard to meet: never lose an important publication, and be able to prove it.

  • Recurring verification: official sources are checked in regular cycles throughout the day, with no manual intervention.
  • Noise-free alerts: only genuinely new items trigger a notification. Already registered items are identified and discarded automatically.
  • Individual delivery: each recipient gets their own message, with no data exposure between clients.
  • Multi-channel: email, WhatsApp and Telegram, with channel redundancy so alerts arrive reliably.

What it monitors

  • CNJ (National Council of Justice): in-person and virtual judgment agendas, plus the DJe (Electronic Judicial Gazette)
  • STF (Supreme Federal Court): judgment agendas
  • TJRJ (Rio de Janeiro State Court of Justice): DJe publications and the Council of the Magistracy

New courts can be added on demand.

Reliability as a feature

In monitoring, silence is ambiguous: no alert can mean nothing happened, or that something broke. So the system closes the loop:

  • Daily operation report: at the end of the day, a report confirms that every source was checked, with or without new publications. Each run is logged with timestamp and result.
  • Public status page: system health is visible at any time.
  • Failure handling: failures are detected and reported immediately, with automatic recovery and no gaps in the history.

LexIA: interpretation on top of detection

Detecting a publication is only half the job. LexIA is the AI layer that generates a structured report for each item: case identification, subject of the judgment, relevance to the recipient’s operation and points of attention to follow. It is delivered in the same monitoring cycle, so the alert arrives already interpreted.

The design principle: AI as infrastructure, not replacement

Lex Sentinel is part of a broader idea: a cognitive infrastructure that supports human work. AI is not a replacement for qualified professionals. It is a continuous support layer that observes sources, organizes signals and expands an institution’s capacity to respond, while people keep the central role of interpretation and judgment.

Why the AMAERJ adoption matters

Instead of a generic, experimental tool far from daily routine, AI can be applied in an objective, discreet and useful way, supporting recurring tasks inside real institutional workflows. That is the shift this case shows.

Lex Sentinel does not replace human intelligence. It gives it a better organized foundation to act on.

About Lex Sentinel

Lex Sentinel is a legal monitoring solution that tracks official sources, identifies new publications and sends automated alerts by email, WhatsApp and Telegram, with daily proof that every source was checked.

Originally published on LinkedIn.