I run a small software company in Tokyo. I am an engineer, not a salesperson. Cold outbound was the part of my job I kept avoiding. So I built an agent that does it for me. It runs as a Claude Code plugin, and the whole stack is open source. This post is about the architecture decisions that mattered. The product is LeadAce ( leadace.ai , source ). It is in Public Beta. It finds companies that match your ICP, reads each company's site, writes one email per company, and sends from your own Gm...