Abraham Hernández Castro

Agents online · illustrative replay

I build AI agent systems that run real operations, with humans approving every step that matters.

Founder of Defabric and MNDA Estudio. I design agentic workflows on Claude — tool scoping, approval gates and cost guardrails — and ship them to the plant floor and the back office. Based in Mexico.

In production
Defabric · 2 factories
Operating
23 Claude Code subagents
Since
2014 · operations → systems
Abraham's 3D animated character touches a glowing amber node inside a network of agents, with a small robot companion
AI-generated character
Awaiting human approval14:59

Re-plan Extrusion 1

The agent proposed a draft. Nothing is written until a person confirms it, with their token and their permissions.

Illustrative diagram: a person asks; the Director agent delegates to the Production lead, who delegates to the Extrusion coordinator; it reads what is pending and proposes a schedule as a draft; the draft goes back to the person, who confirms or rejects it. Only on Confirm is anything written, with that person's permissions.

01 · Selected work

Real systems, with people in the loop.

Three projects running today. Each case explains the architecture, what the agent cannot do without a person, and what is measured (and what isn't).

02MNDA STUDIOOperating

A digital studio operated by 23 Claude Code subagents.

Content, web/apps and music pipelines, with approval gates the code enforces, spend caps and request tracking.

Role
Founder
Year
2019–
Status
Operating
Stack
Claude Code · Node · React
Read the case
Team diagram from equipos.json · panel screenshot pending
02 · How I build agents

Three rules the code enforces.

Not principles on a slide: they're checks in the server and in the scripts, the same in Defabric and in MNDA.

Ask before acting

Agents write drafts, not data. A person presses Confirm, and the action runs with that person's own permissions.

Scope to the user

Each agent only gets the tools its team needs, intersected with what the user is allowed to do.

Meter everything

Token usage per user and per agent; daily and per-job spend caps the scripts refuse to exceed.

04 · Timeline

Since 2014, one thread: operations into systems.

Full timeline

  1. 2026 —Defabric · Founder & Product LeadNow
  2. 2022 —Plastika · IT Manager
  3. 2019 —MNDA Estudio · Founder
  4. 2014 – 2018Treegic · Co-founder & CTO
05 · Contact

Building agents for real operations? Let's talk.

Email is the fastest way to reach me.