Most harness talks optimize for the task. This one optimizes for the human operating it. Two years ago, at 35, I was diagnosed autistic, and it explained something I had been working around for decades: my executive function is inconsistent. Some days I can hold twenty projects; some days I can't answer an email. Tools built for an average user kept assuming I was the same person every day. So I built Digitana, a harness on top of Claude that acts as an external executive function. It is not tuned to do more. It is tuned to load me less. This is a field report from almost 600 numbered working sessions, and how it works: - User state as a control signal. Every morning the harness computes a 0–100 Cognitive Load Index from the phase of my menstrual cycle (hormonal load shifts my energy and focus week by week), meetings, hours already spent with the agent, social load and day of the week. The zone rewrites the agent's operating rules: how many options it offers, how long it answers, and how much it decides without asking. - Memory you can diff, and a harness that learns from use. Sessions, minutes and operational memory live on disk in git, not in a vector DB or inside a provider. The model never changes, but the harness does: every correction becomes a written rule, every session closes with what was learned, and skills update their own instructions from how they were used. Nothing the agent "will remember" exists unless it's persisted. - One agent per project. Fourteen projects, each with its own project-manager agent and a single task board, so delegation is the default and the human only does what only she can do. - Letting an agent act in WhatsApp groups with third parties. Two permission levels, a mention-only trigger, and a fail-closed tool guard: the agent can run the project's scripts and commit locally, but never sends, publishes or deletes on anyone's behalf. The goal of this talk is to show a different kind of value AI can add: beyond making a company more productive, it can also take care of the humans behind it.
Lucía Hernandez Lettier is a Uruguayan founder who sold her first software at 15 and has worked in technology for more than 20 years. She is the founder and CEO of Metodica Digital, a board member of the Ibero-American Federation of Young Entrepreneurs (FIJE), and, through Luz Divergente, advocates for neurodivergent leadership in business. She is a Vital Voices Visionaries Fellow. For the past year she has designed and run Digitana, the AI harness she uses as an external executive function.
