--- title: Best LangChain posts — September 2025 | daily.dev description: The most upvoted LangChain posts from September 2025, curated by the daily.dev community. canonical: https://daily.dev/sources/langchain/best-of/2025/09 twitter:card: summary_large_image twitter:site: @dailydotdev og:url: https://daily.dev/sources/langchain/best-of/2025/09 og:type: website og:site_name: daily.dev og:title: Best LangChain posts — September 2025 | daily.dev og:description: The most upvoted LangChain posts from September 2025, curated by the daily.dev community. og:image: https://media.daily.dev/image/upload/s--VAY5ToZt--/f_auto/v1724209435/public/daily.dev%20-%20open%20graph --- # Best of LangChain — September 2025 1. 1 [](https://daily.dev/posts/building-langgraph-designing-an-agent-runtime-from-first-principles-w6yszlcdh "Building LangGraph: Designing an Agent Runtime from first principles") Article LangChain · 1y Building LangGraph: Designing an Agent Runtime from first principles LangGraph was designed as a low-level agent framework prioritizing production readiness over ease of getting started. Built to address LangChain's feedback about customization and scaling challenges, it focuses on six core features: parallelization, streaming, task queues, checkpointing, human-in-the-loop capabilities, and tracing. The framework uses a structured execution model based on the Pregel algorithm with channels and nodes, enabling deterministic concurrency and fault tolerance. Performance scales gracefully with agent complexity while maintaining low latency, making it suitable for production deployments at companies like LinkedIn, Uber, and Klarna. 39 2. 2 [](https://daily.dev/posts/how-to-turn-claude-code-into-a-domain-specific-coding-agent-uruamdg1r "How to turn Claude Code into a domain specific coding agent") Article LangChain · 1y How to turn Claude Code into a domain specific coding agent LangChain researchers tested different configurations of Claude Code to improve its performance on domain-specific libraries like LangGraph. They found that high-quality, condensed documentation (Claude.md) combined with tools for accessing detailed information produced the best results. Simply providing raw documentation access didn't improve performance as much as expected and filled up the context window faster. The study used a comprehensive evaluation framework testing functionality, task requirements, and code quality across three different coding tasks. 14 [See all LangChain archives](/sources/langchain/best-of) ```json {"@context":"https://schema.org","@graph":[{"@type":"Organization","@id":"https://daily.dev/#organization","name":"daily.dev","url":"https://daily.dev","logo":{"@type":"ImageObject","url":"https://daily.dev/apple-touch-icon.png","width":180,"height":180},"sameAs":["https://twitter.com/dailydotdev","https://github.com/dailydotdev","https://www.linkedin.com/company/daily-dev-ltd"]},{"@type":"WebSite","@id":"https://daily.dev/#website","url":"https://daily.dev","name":"daily.dev","publisher":{"@id":"https://daily.dev/#organization"},"potentialAction":{"@type":"SearchAction","target":{"@type":"EntryPoint","urlTemplate":"https://daily.dev/search?q={search_term_string}"},"query-input":"required name=search_term_string"}}]} {"@context":"https://schema.org","@graph":[{"@type":"CollectionPage","@id":"https://daily.dev/sources/langchain/best-of/2025/09#page","url":"https://daily.dev/sources/langchain/best-of/2025/09","name":"Best LangChain Posts — September 2025","description":"The most upvoted LangChain posts from September 2025, curated by the daily.dev community.","isPartOf":{"@type":"WebSite","url":"https://daily.dev"}},{"@type":"ItemList","@id":"https://daily.dev/sources/langchain/best-of/2025/09#items","numberOfItems":2,"itemListElement":[{"@type":"ListItem","position":1,"url":"https://daily.dev/posts/building-langgraph-designing-an-agent-runtime-from-first-principles-w6yszlcdh","name":"Building LangGraph: Designing an Agent Runtime from first principles"},{"@type":"ListItem","position":2,"url":"https://daily.dev/posts/how-to-turn-claude-code-into-a-domain-specific-coding-agent-uruamdg1r","name":"How to turn Claude Code into a domain specific coding agent"}]},{"@type":"BreadcrumbList","itemListElement":[{"@type":"ListItem","position":1,"name":"Home","item":"https://daily.dev"},{"@type":"ListItem","position":2,"name":"Sources","item":"https://daily.dev/sources"},{"@type":"ListItem","position":3,"name":"LangChain","item":"https://daily.dev/sources/langchain"},{"@type":"ListItem","position":4,"name":"Best of","item":"https://daily.dev/sources/langchain/best-of"},{"@type":"ListItem","position":5,"name":"September 2025"}]}]} ```