TSI Nexus: An Open-Source Digital Brain Powered by Local Gemma 4 26B and Context Graphs

Code

GitHub Repository - Apache 2.0 License

How I Used Gemma 4

We needed a model that could parse complex institutional intent, enforce strict rules, and run entirely on-premise. Gemma 4 26B fit all three.

It handles two core jobs in TSI Nexus:

Intent to command. When a field user types a natural language request, Gemma 4 maps it to an exact registered command verb like /disburse_loan or /verify_kyc. No guessing, no drift.

Policy evaluation. Before any command runs, Gemma 4 checks it against the live context and business rules from the Context Graph. It either approves, blocks, or flags for escalation.

We run Gemma 4 26B locally, so data stays fully on-premise, which is non-negotiable for institutional use cases. Gemma 4's instruction-following is what made this practical - earlier models would hallucinate field values or misroute commands. Gemma 4 holds the structure consistently, which matters when commands touch real business operations.