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AgentsInternals
Coding agent harness: what I learned by cracking open Codex, OpenCode and Pi
Coding agents differ not by model but by the architectural bets of the harness. Reading the source of Codex, OpenCode, Pi and my own agent to tell load-bearing bets from ones you write to delete.
July 17, 2026
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AgentsInternals
Jev: How Its Decision API Works and What People Build
September 18, 2026
AgentsIndustry
02Loop engineering: how to design loops for coding agents
Peter Steinberger told everyone to stop prompting coding agents and design loops instead. Here is what actually sits und...
August 17, 2026
InternalsPractice
03Why one character breaks the cache: prompt caching under the hood
Part two of the prompt caching series. We dig into the vLLM and paged attention source to find the byte-level reason beh...
June 26, 2026
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