Best AI Agent Design Newsletters in 2026
NewsletterFIT tracks 4 newsletters that cover AI agent design as a primary topic, 3 of them with posts in the last 90 days. By publicly shown subscriber count, the largest are Proof of Concept (13K), Tech Growth Series: PrepVector (10K) and The AI Blueprint (2K).
Updated Nov 12, 2026 · sorted by publicly shown subscribers · methodology
- 1Proof of Concept13K subscribers
SubstackWeekly · last post 10 days ago
From recent posts: Proof of Concept publishes a rotating mix of essays on software development, product strategy, and design management for engineers, product leaders, and founders. Issues cover topics ranging from the philosophy of…
Likely audience: designers
- 2Tech Growth Series: PrepVector10K subscribers
SubstackMonthly or less · last post Sep 1, 2026
Leading with data: Insights on product growth, data science, and career growth for tech professionals
Likely audience: Product Managers
- 3The AI Blueprint 2K subscribers
SubstackDaily · last post 11 days ago
The AI Blueprint is a publication for builders, creators, operators, and curious minds who want more than another collection of AI news, prompts, and surface-level tips.
- 4Andrew Miller1K subscribers
Substacklast post Jul 20, 2025
From recent posts: Andrew Miller's newsletter publishes a mix of AI technical tutorials, industry news, and personal founder updates. It is aimed at developers and AI practitioners interested in LLM context engineering, prompt-driven…
Likely audience: product managers
Latest posts from these newsletters
- You're all…Proof of Concept
- Master Agentic…The AI Blueprint
- Human-in-the-Loop Engineering…The AI Blueprint
- Claude Gets…The AI Blueprint
- Failure Engineering…The AI Blueprint
- Skill Engineering:…The AI Blueprint
- Working at…Proof of Concept
- Learn to…Proof of Concept