The Agent Stack
Vinoth GovindarajanThe Agent Stack is a technical deep dive into how modern AI agents actually work under the hood, from control loops and memory systems to orchestration, evaluation, and production deployment.
| Platform |  | Pricing | Only free issues | Publishes | Weekly |
|---|---|---|---|---|---|
| Issues | 28 | Founded | 7 months ago | Last Issue | 7 days ago |
| Active | |||||
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OpenCode Architecture - Part 1: Clients, Sessions, and the Coding Loop
Two OpenCode runs ended with the exact same sentence:
The whitespace bug is fixed and the tests pass.
Both CLI processes exited successfully.
Only one changed the source file and left behind a workspace whose unchanged tests passed.
I...
Hermes Agent Architecture - Part 5: A Separate Profile Is Not a Sandbox
I gave Hermes a fresh profile and a small workspace.
The profile had its own state. But when Hermes ran locally, it could still read a file sitting beside that workspace.
Nothing was broken. I had asked the profile to provide a boundary i...
Hermes Agent Architecture - Part 4: Tools, Plugins, Delegation, and Persistent Work
The cronjob said completed.
Both commands it copied had exited with status code 2.
No operation receipt existed.
That was the most useful result in this experiment.
I gave Hermes the same deliberately boring maintenance task through f...
Hermes Agent Architecture - Part 3: Memory, Skills, and the Self-Improvement Loop
I taught Hermes one fact and one procedure. They persisted differently.
I wanted to answer one practical question.
If I teach an agent one environment fact, one personal preference, and one repeatable procedure, what should survive afte...
Hermes Agent Architecture - Part 2: Prompt Assembly, Context Files, and Compression
I changed Hermes’s USER.md while a session was still running.
The file changed immediately.
The next provider-bound request did not.
It still contained the old user profile.
Then I compressed the session.
Same session ID. New system...
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Authors
The writers behind this newsletter.
Systems engineer at OpenAI, open-source contributor, and co-author of Engineering Lakehouses with Open Table Formats, explaining how modern AI agents and data systems actually work in production.
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