A weekly briefing for engineers and technical leads building AI agents: new articles and major updates, with clear summaries and links to the full analysis.
We cover agent architecture, evaluation, memory, security and operating costs. Expect a concise reading list with sources and useful implementation notes.
Get the weekly briefing · Read the free agent evaluation checklist
Sample briefing: testing an AI agent before deployment
Sample issue, 6 September 2026. This sample links to published articles and shows what a weekly email looks like.
1. Compare what agent benchmarks actually measure
Messier brings agent evaluation results together across benchmarks. Before using a leaderboard to choose an agent, inspect the tasks, scoring and verification behind the number. Different evaluation designs can answer different questions.
Read: Messier Maps Agent Benchmark Drift
2. Check what your memory system retrieves
IFCMemoryBench examines missing project facts. A useful practical question is whether the system can recover the specific information a task requires, not simply produce a plausible response.
Read: IFCMemoryBench Finds the Missing Project Facts
3. Test authorisation throughout a task
MasDrift examines authorisation drift. Include a test where the allowed scope changes during execution, and inspect whether the next action respects the new boundary.
Read: MasDrift Measures Authorisation Drift
One practical check
Choose one representative task. Record its success condition, allowed tools, budget and stop rule before running it. Then add an unavailable tool and a request outside the permitted scope. Compare the resulting traces with the original success condition.
This is a starting exercise, not evidence that a system is production-ready. Your workload, consequences of failure and deployment environment determine the remaining tests.
Use the full evaluation checklist or start with agent architecture selection.
What subscribing means
A roundup every Monday at 10:00 UK time, covering new articles and major updates, with occasional service messages needed to manage your subscription. One roundup a week. You can unsubscribe from any briefing. See our privacy policy.