News for hackers. Stuff that matters.

anupsing_ai

Data gets written to WAL first before memory and then persisted to disk. on restarts, it restores to memory and continues. the benefit comes from the architecture. each cell is supposed to be a dedicated compute for a single user.

Show HN: Open-source Perplexity clone one file back end, streaming answers

https://github.com/oncellai/oncell-research

I built an open-source research agent. You ask a question, it searches the web via Tavily, synthesizes an answer with an LLM, and shows the sources it used. Answers stream in real-time.The interesting part is the backend. It's a single JS file (~100 lines) that handles web search, LLM streaming, and per-user conversation history. No vector database, no Redis, no separate storage service.It runs...

( Read More... | 2 comments | 6 points | on HN )

Show HN: AI support chatbot with RAG and citations – one back end file, no infra

https://github.com/oncellai/oncell-support-agent

Upload markdown docs, get a support chatbot that answers with citations. The entire backend is one JS file — storage, search, and conversation history are handled by the runtime.Stack: Next.js + OnCell + OpenRouter.Demo: https://youtu.be/rWIU43pOH5Y

( Read More... | no comments | 8 points | on HN )
Re: on Monday February 09, 2026 @01:54AM (#46942341)
Been building multi-agent systems for the past few months and keep running into the same problem: agent regressions that no traditional test catches. Wrote up the failure modes I've actually seen. The short version: Skill bloat is the sneaky one. You add tools over time, each makes sense individually, then at 30+ tools the agent starts picking wrong ones. Anthropic's team wrote about this too. A single Playwright MCP server burns 11.7K tokens on tool definitions alone, included in every request whether you use them or not. Context rot caught me off guard. Chroma measured 18 LLMs and found 11/12 drop below 50% performance at just 32K tokens. We had a bug where adding a new capability pushed an older instruction into the "lost in the middle" zone. Took two days to figure out why an unrelated feature degraded. The scariest one is when a prompt tweak makes your agent stop saying "I don't know" and start confidently making things up. Surface metrics go up. Accuracy goes down. Google's AI Overviews had this problem at scale. Also covers cost creep (same traffic, 40% higher bill, nobody has a cost gate in CI/CD), multi-agent cascade failures (Berkeley's MAST paper found 14 failure modes across 7 frameworks, ChatDev hit 33% correctness), and model updates breaking things you didn't touch. We have 20 years of great tooling for deterministic regression. For probabilistic regression we have basically nothing.