Custom AI Models

Yeriko Vargas

AI Engineer · AI Systems Architect · Detroit, MI

AI tools

What I build with in 2026, every day. Models are routed by cost: the expensive one thinks, the cheap one reads, and Python does everything a model doesn't have to.

Models and agents

Claude Codedaily driver

Architecture, refactors and builds, with a project law the agent reads every turn.

claude -p, headlessinside Python

One fenced model call per pipeline step, with a cost cap, a timeout and a receipt.

Model routingOpus · Sonnet · Haiku

Opus for design, Sonnet for writing and builds, Haiku for cheap read-backs and checks.

Claude API · OpenAI APIproduction

RAG and agent systems for clients, with evaluation and telemetry in every step.

Agents with fencesone folder each

Each agent has its own folder, permissions file and log. A guard asks before anything leaves it.

MCP + skillsone intake

Outside skills and MCP servers come in through one quarantine, with a security read before install.

Around the model

Python, stdlib firstthe system

Gates, schedulers, parsers and servers. A new package only when it earns its place.

Playwrightbrowser

Opens the platform, fills the draft, stops. A person presses Post.

GitHub · Railway · Cloudflareship

Push to main, Railway deploys, Cloudflare handles DNS and redirects.

Search Console API · IndexNowbe found

Read-only index checks on Google, instant pings to Bing and the engines that read it.