the reason i'm excited about decision models: agentic systems are just good engineering around models. 'build prod, not god' these types of …

the reason i'm excited about decision models: agentic systems are just good engineering around models. "build prod, not god" these types of fast, cheap & accurate models are super important for that the excitement around jev shows that most people think this way as well! jev is a new type of model - "decision models" there are a few open source alternatives, one is SemIf (based on qwen3.5) we're hosting SemIf and offering it for free through LangSmith Gateway for the next week!

Agent engineering is hard Deep Agents hides a lot of the weird systems complexity, but still gives you more room to customize the harness th…
im excited about agent harnesses because i think are the first stable agent abstractions we can build on top (which is why we're investing s…
The ‘agent harness’ is essentially the new runtime. It’s like a lightweight OS around an LLM—handling memory, tool calls, retries, and contr…
Harness Engineering Derived from what Models can’t do alone: It feels like a good time to step back and reshare some basic mental models for…
This blog is full of design choices as you build your Agentic systems. Critical choices to be made, evals need to be upgraded if the underly…

Source: Harrison Chase (X) | 2026-09-21

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