From spaghetti to main bus: refactoring an AI agent orchestrator with Elm
The article describes the evolution of an AI agent orchestration system from a tangled, hard-to-maintain 'spaghetti' architecture to a cleaner, more scalable design using Elm and a 'main bus' approach. The original system, while functional, suffered from hidden failures, state inconsistencies, and growing complexity as new workflows were added. By refactoring with strict state-machine principles and decoupling state from business logic, the system became more predictable and maintainable.
- ▪The initial AI agent orchestrator worked but became unmanageable as new workflows introduced complexity through if-statements and fallbacks.
- ▪Spaghetti architecture led to issues like silently dropped tasks, stuck states, lost data during retries, and infinite loops such as 'PR ping-pong'.
- ▪The refactor introduced a 'main bus' design with a centralized spine, enabling clean separation between state management and business logic.
- ▪The new architecture, built with Elm, enforces state-machine discipline and prevents side effects from propagating across components.
- ▪The redesign reduced hidden failures and made state transitions explicit, improving reliability and maintainability.
Hacker News (AI / LLM) files mainly under ai. We currently carry 2,687 of its stories.
Story provenance
Source · retrieval · rights · ranking — open for full record
inspect →
Attribution is not the same as permission. This drawer separates discovery metadata, excerpts, WeSearch-generated summaries, reuse status, and whether the publisher receives the visit. Nothing here claims a legal grant the publisher has not made.
Record
| Original publisher | Mariohayashi |
| Canonical URL | https://blog.mariohayashi.com/p/the-factory-must-grow-part-ii-from |
| Publication time | Tue, 28 Apr 2026 23:35:21 +0000 |
| Retrieval time | 2026-04-29T00:27:34.794Z |
| Last seen | 2026-04-29T00:27:34.794Z |
| Headline source | Publisher (no WeSearch rewrite) |
| Excerpt source | publisher body |
| Excerpt method | First ~120 words (~800 chars) of extracted publisher body, fair-use limited. |
| Summary | WeSearch · cerebras-chat (WeSearch summarizer) |
| Summary source text | contentText |
| Citation coverage | Summary is a WeSearch-generated derivative; primary citation is the original publisher URL. |
| Cluster | 5FOw3FaDqSws |
| Cluster logic | Grouped by semantic title/content similarity across sources within a rolling window. Same-publisher template collisions are excluded from coverage comparison. |
| Ranking reason | Story pages are not engagement-ranked. Hub feeds use recency, with optional source-diversified chronological ordering (cap consecutive stories per source). No personalized ranking. |
| Publisher visit | Yes — open original |
| Substitutes article? | No — link-out required for full text |
Rights status (four layers)
WeSearch handling by dimension
| Indexing | May the item be indexed (stored, ranked, made findable)? | Allowed |
| Snippet | May a short excerpt of the publisher's text be shown? | Allowed |
| AI summary | May WeSearch generate its own short summary of the article? | Limited |
| Retrieval / RAG | May the content be exposed for third-party retrieval-augmented generation? | Not asserted |
| Model training | May the content be used to train AI models? | Not asserted |
| Commercial reuse | May the content be reused commercially? | Not permitted |
Basis: Derived from the published RSS/Atom feed. Contact: [email protected]. Reviewed: 2026-07-24.
Opening excerpt (first ~120 words) tap to expand
The Factory Must Grow (Part II): From Spaghetti AI Agent Orchestrator to a Main Bustl;dr: In Part I, I built the factory: an orchestration system that runs AI agents like workers on a production line. Part II tears the original system down and rebuilds it from first principles.Mario HayashiApr 28, 2026ShareThis post is about The Big Rejig and mistakes that burned millions of Claude tokens. Part I post here.AI agent orchestration: From spaghetti architecture to clean, predictable Elm architectureThe First Factory WorkedFor those who’ve played the game, your first Factorio factory works. Iron moves on the conveyor belts, copper is delivered to assemblers and circuit boards come out on the other side.
…
Excerpt limited to ~120 words for fair-use compliance. The full article is at Mariohayashi.
Discussion
0 commentsMore from Mariohayashi
