Cesar Toscano

I build AI agents, and the harness that makes them dependable.

Since 2025 I've built MCP servers, LLM pipelines with evals, and codebases where coding agents can check their own work.

workflowharnessagent runverifierhuman gatestart from the work, not the APIfails go back, not forwarda person sends
Now
Founder, Weller Labs · AI engineering and GTM systems engagements
Before
Mahana Therapeutics, Bitmatica, StackLead, AVG
Based
San Francisco
School
MIT