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The hardness of a harness
Explore the internals of an agent harness, tool calling, AI chatbot conversation history, and event sourcing for building custom business software with AI.
I built an agentic harness in Rust, and can talk about what goes under the hood of one.
For the bigger picture, I’m programming a “business logic executor”, to make it easier to create custom business software (naturally, with AI, on all levels). Using event-sourcing, Rust, and Postgres. In addition to the typical web user interface, background agents and chatbots can also interact with the business logic and data.
To make all that work, I ended up writing my own agent harness, web-based chat UI, chat conversation storage in SQL, and so on. It’s still early days, but the journey has already been fun.
(This is a very early stage startup, talk to me afterward if you’re interested in serving small businesses with custom software. My approach to spec-driven development is starting to work, AI is lowering the cost of making small-scale custom things, Claude is starting to get really good at programming “within a box”, and deterministic rules triggered by AIs at runtime make the system stay sane!)