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 | 33 | Founded | 9 months ago | Last Issue | 11 days ago |
| Active | |||||
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theagentstack.substack.comLatest Issues
When Agents Do the Work, What Do Humans Still Decide?
Imagine a coding agent completes an implementation, reports passing tests, and hands over a patch for review. The original request was to save report settings. During the work, the requirement expanded to retaining the complete contents of...
OpenCode Architecture - Part 5: Snapshots, Recovery, and Patch Verification
The source code went back to its original version. The JSON file it generated did not.
A coding request had fixed a JavaScript function and started a script that produced an updated data file. Before the script could write a matching check...
OpenCode Architecture - Part 4: Subagents and Shared Work
In one of the experiments, OpenCode blocked the coordinator from editing a file but allowed its worker to make the same edit. Why didn’t the restriction follow the task?
The worker’s own role allowed the edit. The restriction was on the co...
OpenCode Architecture - Part 3: Tool Execution and Permission Boundaries
You configure a coding agent to ask before editing a file.
You expect that to mean: ask me first.
But in OpenCode’s noninteractive CLI, I got this:
Without
--auto→ask→ client rejects
With--auto→ask→ client replies...
OpenCode Architecture - Part 2: Repository Context and Compaction
Consider a familiar workflow. You ask a coding agent to inspect a file, change that file yourself, then continue the conversation.
The path is the same. The conversation still contains the earlier inspection. But the file and the conversat...
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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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