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The Labs Letter.

What we are researching. What we shipped. What failed.

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What subscribers get.

We do not write to fill a schedule. Each issue is sent when we have something worth saying. Usually once a month, sometimes more, sometimes less.

Research findings

Summaries of completed experiments with methodology, results, and honest assessment of what worked and what did not.

Experiment logs

What we are running right now: hypothesis, current state, early observations. We write these before we know the outcome.

Open-source releases

First notice of new repositories, major updates to existing tools, and deprecations. With the reasoning behind each.

Upcoming talks

Where we are presenting next, what we are planning to say, and links to slides and recordings after the event.

Occasional deep-dives

When we have something long to say that does not fit a standard article format — a detailed post-mortem, a technical tutorial, a research design document.

What failed

We document experiments that did not work. These are sometimes the most useful issues — a documented failure prevents someone else from repeating the same mistake.

Archive preview

Recent issues.

A sample of what the last few issues covered. The full archive is available to subscribers.

Issue #024
The Output Validation Problem: Why Prompts Are Not Enough
Output validation · Schema enforcement · Retry design · Production failure modes
Feb 2026
Issue #023
Six Months of pgvector in Production: What We Learned
RAG · Vector search · Embedding drift · Query optimisation
Jan 2026
Issue #022
Why We Archived Two Open-Source Repositories
Open source maintenance · Sustainability · Deprecation process
Dec 2025
Issue #021
Benchmark Update: Q4 2025 Numbers and What Changed
Benchmarks · Model updates · Accuracy regression · New measurements
Nov 2025
Issue #020
The 40% Threshold: When to Trust AI and When Not To
Automation thresholds · Human oversight · Decision boundaries
Oct 2025

Issue #001 through #019 available in the archive after subscribing.

What subscribers say

From the readers.

The Labs Letter is the only AI newsletter I read where the author admits when something didn't work. That alone makes it worth subscribing.

Senior Engineer at a fintech startupSubscriber since issue #012

I've implemented three patterns from the Labs research directly in our production systems. The observability middleware alone saved us hours of debugging.

CTO, SaaS companySubscriber since issue #008

Short, dense, no padding. Every issue has something I can use in the week it arrives. That's rare.

Independent researcherSubscriber since issue #001

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