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Writing · Field notes from the operating layer

Ideas for operating AI, not merely adopting it.

Essays, field reports, frameworks, and technical guides for the people responsible for making AI work.

Current essay · Models & Engineering

The AI Most People Haven't Met Yet

Chatbots continue and coordinate symbolic information. A different class of model represents how a bounded environment may change, often conditioned on action. Both are useful. Treating them as the same thing is why enterprise AI conversations keep talking past each other.

Choose your path

Start with the work closest to the decisions you make.

Editorial pillars

Six editorial lenses. Each starts from a point of view, not a topic label.

Active series

Multi-part arguments, ordered as published.

Series / qwen38-local-wow

Qwen3.8: Same Weights, Different Product

A five-part investigation into how the harness and serving stack make Qwen3.8-27B useful: the reasoning dial, the harness delta (raw local 2/8 → harnessed 8/8), verified demos, portfolio economics, and native 262K context on 32 GB.

5 published parts5/5 planned
Browse in archive

Series / agent-native-work

Agent-Native Work

A four-part series on designing work for agents: why software got them first, every domain's AGENTS.md, the verification gap, and the practitioner-builder.

4 published parts4/4 planned
Browse in archive

Series / llm-os-modes

Modes of the LLM OS

A six-part series on the operating modes behind frontier AI: Chat, Agent, Deep Research, Cowork, and owned infrastructure.

6 published parts6/6 planned
Browse in archive

Series / token-economy

The Token Economy

A strategy and architecture series on token economics, model portfolios, and AI factory operations.

3 published parts3/3 planned
Browse in archive

Series / context-compilation

Context Compilation

The missing systems layer between retrieval and reasoning, from benchmark blind spots to measured evidence.

3 published parts3/3 planned
Browse in archive

Series / autonomous-stack

The Autonomous Stack

The architecture of intelligent systems, from the data substrate to agent runtimes and prescriptive intelligence.

4 published partsOngoing
Browse in archive

Series / agent-societies

Agent Societies

A field guide to what happens when agents interact at scale, from emergence to competence.

4 published partsOngoing
Browse in archive

Series / ai-native-computer

AI-Native Computer

A technical and operating-model series on what changes when AI becomes the computer, not just another app.

3 published partsOngoing
Browse in archive

Complete index

Archive

27 essays

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  1. Field Report · August 19, 2026

    262K on 32 GB: The Serving Stack That Changed the Desk

    Qwen3.8-27B can hold its native 262K context window on one RTX 5090. The reason is architectural, and the serving stack matters as much as the weights.

  2. Field Report · August 17, 2026

    Same Weights, Different Product: How the Harness Made Qwen3.8 Useful.

    An independent lab investigation. The same open-weight model, served two ways, produced either an empty afternoon or a daily driver. What changed was the harness, not the weights. A newcomer-friendly entry to a four-part series.

  3. Field Report · August 16, 2026

    The $6K Desk That Works: Near-Frontier Private AI (Part 2)

    An offline 8-task workday, synthetic privacy drills, and six verified one-file browser demos. Same weights, better harness, and the honest economics of owning versus renting.

  4. Technical Guide · July 28, 2026

    What Memory Bandwidth Actually Buys You: LLM Inference Hardware in 2026

    A first-principles guide to inference hardware from desk to rack — M5 Max, DGX Spark clusters, prosumer PCs, RTX PRO 6000, Lenovo 8× H200/B200 nodes, AMD Instinct, plus prefill vs decode math, VRAM sizing, and API vs rent vs own TCO.

  5. Technical Guide · July 9, 2026

    Every Domain Needs Its AGENTS.md

    AGENTS.md is not a document. It is an interface stack — MCP tools, skill catalogs, policy packs, and audit streams — with a README on top. Five translations, one procurement boundary, and the difference between agent-legible and Potemkin agent-ready.

  6. Framework · May 18, 2026

    Cowork Mode: State Is the Coworker

    The difference between a chatbot and a coworker is state. Claude Code, Cursor, Operator, Codex, ChatGPT Projects. Persistent memory, skills, knowledge base, environment access. Session-long state — and the most dangerous un-governed surface in the enterprise today.

  7. Technical Guide · May 11, 2026

    Deep Research Mode: Planner, Swarm, Synthesizer

    Deep research is not a bigger chat. It is three sub-systems pretending to be one — a planner that decomposes the question, a swarm of agents that search in parallel, and a synthesizer that does a long-context reduce. 5 to 15 minutes. Hundreds of thousands of tokens. And the richest audit trail of any mode.

  8. Technical Guide · May 4, 2026

    Agent Mode: The Loop Is the Machine

    Agents are not a model. They are a loop. One Agent turn equals 5–50 Chat-mode calls, plus tools, plus state, plus a kill switch. Here is what you actually pay for when Cursor writes a PR — and what enterprise governance must cover that Chat-mode governance does not.

  9. Technical Guide · April 27, 2026

    Chat Mode: Single-Shot on Shared Silicon

    One prompt in. One response out. Fourteen infrastructure layers in between. Reasoning models are still Chat Mode — they just rent the GPU for longer. Here is what actually happens, and why it is still one machine.

  10. Technical Guide · April 19, 2026

    Designing the AI Control Plane

    Seventeen control planes, zero control. The architecture pattern that turns the CEO's token-economics argument and the Data Gravity placement argument into a single governed operating system for enterprise AI.

  11. Framework · April 13, 2026

    What Context Engineering Actually Means

    RAG, MCP, memory systems, fine-tuning, prompt caching, AGENTS.md, knowledge graphs — everyone has a piece of the context puzzle. Nobody has the whole picture. Here's what's missing and why it matters.

  12. Technical Guide · April 11, 2026

    The Missing Layer

    Context Compilation Theory, Context IR, and the architecture between access and reasoning. How measuring benchmark gaps revealed a missing systems layer — and why it changes how we should build AI systems.

  13. Framework · March 15, 2026

    The Data Layer Nobody's Building

    Vector stores and RAG are table stakes. Real agent intelligence needs a continuous, multi-modal data substrate with episodic, semantic, relational, temporal, and contextual data.

  14. Technical Guide · January 26, 2026

    SemanticStudio: A Production-Ready Enterprise RAG Agent System

    Open-sourcing the multi-agent chat platform I built to test my AI-native architecture ideas. 28 domain agents, 5 configurable modes, 4-tier memory with Context Graph, GraphRAG-lite, and everything enterprises need to build production AI.

  15. Technical Guide · January 26, 2026

    Domain Agents: Specialization at Scale

    Why SemanticStudio uses specialized domain agents instead of one general-purpose assistant, and how to configure and manage them—from 12 to 50+ agents.

  16. Technical Guide · January 26, 2026

    RAG Chain Configuration: Models, Modes, and Fine-Tuning

    The power user's guide to configuring SemanticStudio's RAG chain—multi-provider LLM support, mode parameters, and full control over cost vs. quality.

  17. Technical Guide · January 26, 2026

    Memory as Infrastructure: The Complete 4-Tier System

    A deep dive into SemanticStudio's 4-tier memory architecture—working context, session memory, long-term memory, and the Context Graph. Progressive compression meets knowledge bridging.

  18. Technical Guide · January 26, 2026

    GraphRAG-lite: Beyond Vector Similarity

    How SemanticStudio's knowledge graph and entity resolution enable relationship discovery that pure vector RAG misses.

  19. Technical Guide · January 3, 2026

    RaaS Architecture: The Control Plane That Makes Outcomes Real

    RaaS isn't a pricing model—it's the commercialization of an execution loop. Here's what Result Contracts look like, how the Outcome Control Loop works, and what providers and consumers need to make outcome-based models real.

  20. Technical Guide · December 5, 2025

    Context Engineering: Beyond Window Sizes

    How to architect RAG systems that overcome attention dilution and recency bias in large context windows.

  21. Technical Guide · December 1, 2025

    Agentic Architecture: Patterns That Scale

    Design patterns for multi-agent AI systems that actually work in production environments.

  22. Technical Guide · November 26, 2025

    Building RAG Systems at Enterprise Scale

    Lessons learned from implementing retrieval-augmented generation across hundreds of documents and thousands of users.

Newsletter · The Operating Layer

The dispatch for people accountable for making AI work.

A biweekly note on governed enterprise AI, written from inside the operating problem.

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Writing | Brian Letort