Weekly breakdowns of harness configs, eval frameworks, and the tooling that separates demo agents from production agents. No hype. No guru energy.
Join builders shipping real agent infrastructure
The gap isn't intelligence — it's infrastructure. The harness layer between your model and the real world is where agents live or die.
Your agent works in a notebook. It falls apart in production because there's no eval loop, no retry logic, no guardrails.
MCP servers, function calling, RAG pipelines — the ecosystem is exploding but nobody's curating what actually works together.
Every "AI newsletter" covers fundraising rounds. Nobody covers the eval framework that actually caught the hallucination before it hit prod.
Every issue is structured the same way so you can scan in 4 minutes or go deep when something matters.
One insight about the agent infrastructure space distilled into a paragraph you can actually use this week.
Curated developments in harnesses, evals, MCP servers, and agent tooling — with context on why they matter.
A real harness config, eval setup, or agent architecture you can steal and adapt. Code included.
Fast links — new repos, tools, papers, and drops that crossed the quality bar but don't need a full writeup.
A single, concrete action you can take before the next issue. Not theory — a thing you can do today.
We share our own subscriber count, open rates, and revenue. If we're going to talk about building in public, we mean it.
Each issue follows a consistent format so you always know where to find what matters to you. Read the whole thing in 4 minutes, or jump straight to The Build for copy-paste configs.
Get the First IssueBuilding agent-powered features and need production-grade patterns, not toy demos.
Evaluating AI infrastructure for your product and need signal on what actually works.
Responsible for keeping agent systems running and need eval frameworks and monitoring patterns.
Not an ML engineer, but you know the real leverage is in the infrastructure layer, not the model.
We think transparency beats authority. Here's what that looks like in practice.
We cover what works, what doesn't, and what we're still figuring out.
Every issue includes something you can copy-paste into your own stack.
The newsletter is free. If we build paid products, they'll earn their price.
We share subscriber count, open rates, and revenue. Every issue. No exceptions.
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