--- title: Ontologies Are So Back: Why AI Agents Are Reviving the... description: AI engineers are rediscovering ontologies — formal descriptions of entities, classes, and relationships — as a way to impose deterministic guardrails on... canonical: https://daily.dev/posts/ontologies-are-so-back-why-ai-agents-are-reviving-the-semantic-web-lpzicnimt twitter:card: summary_large_image twitter:site: @dailydotdev og:type: website og:site_name: daily.dev og:title: Ontologies Are So Back: Why AI Agents Are Reviving the Semantic Web | daily.dev og:description: AI engineers are rediscovering ontologies — formal descriptions of entities, classes, and relationships — as a way to impose deterministic guardrails on... og:url: https://daily.dev/posts/ontologies-are-so-back-why-ai-agents-are-reviving-the-semantic-web-lpzicnimt og:image: https://api.daily.dev/og/posts/LPzICNimT.png og:image:alt: Ontologies Are So Back: Why AI Agents Are Reviving the Semantic Web og:image:width: 1200 og:image:height: 630 og:locale: en --- > ## Documentation Index > Fetch the complete documentation index at: https://daily.dev/llms.txt > Use this file to discover all available pages before exploring further. # Ontologies Are So Back: Why AI Agents Are Reviving the Semantic Web **[Latent Space](https://daily.dev/sources/latentspace)** · 6 min read · 0 upvotes · 0 comments ## Summary AI engineers are rediscovering ontologies — formal descriptions of entities, classes, and relationships — as a way to impose deterministic guardrails on probabilistic LLM-based agents. Frank Coyle (UC Berkeley) and Neo4j CEO Emil Eifrem both presented at AI Engineer World's Fair on how ontologies, including established Semantic Web standards like OWL, RDFS, Schema.org, and FOAF, can constrain agent loops and validate LLM reasoning. Coyle frames this as 'neurosymbolic AI': combining neural networks with rule-based symbolic systems. The key benefit is keeping LLMs 'on the rails' during agentic loops. The main challenge remains ontology maintenance, though one proposed solution is having agents self-update their ontologies when encountering edge cases. The trend reflects a broader 2026 shift back toward software engineering discipline after the vibe-coding era. ## Full article daily.dev links to this article rather than hosting it. Read it at the original source: ## Similar posts on daily.dev - [Ontology engineering: what it is, why it's back, and the half agents need that we haven't built](https://daily.dev/posts/ontology-engineering-what-it-is-why-it-s-back-and-the-half-agents-need-that-we-haven-t-built-4pugaeoay) · dltHub · 0 upvotes · 0 comments - [Context, Semantics, and Ontology: A Primer for the Agentic Era](https://daily.dev/posts/context-semantics-and-ontology-a-primer-for-the-agentic-era-kwvutpnte) · MotherDuck · 6 upvotes · 0 comments --- Tags: [#ai-agents](https://daily.dev/tags/ai-agents) [View this post on daily.dev](https://daily.dev/posts/ontologies-are-so-back-why-ai-agents-are-reviving-the-semantic-web-lpzicnimt) ```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","@type":"TechArticle","headline":"Ontologies Are So Back: Why AI Agents Are Reviving the Semantic Web","url":"https://daily.dev/posts/ontologies-are-so-back-why-ai-agents-are-reviving-the-semantic-web-lpzicnimt","mainEntityOfPage":{"@type":"WebPage","@id":"https://daily.dev/posts/ontologies-are-so-back-why-ai-agents-are-reviving-the-semantic-web-lpzicnimt"},"datePublished":"2026-07-30T11:20:56.910Z","dateModified":"2026-07-30T11:21:53.299Z","description":"AI engineers are rediscovering ontologies — formal descriptions of entities, classes, and relationships — as a way to impose deterministic guardrails on...","image":"https://media.daily.dev/image/upload/f_auto,q_auto/v1/posts/d1e33789f422eb7e92787d381c47646d?_a=AQAEuop","thumbnailUrl":"https://media.daily.dev/image/upload/f_auto,q_auto/v1/posts/d1e33789f422eb7e92787d381c47646d?_a=AQAEuop","isAccessibleForFree":true,"articleSection":"Latent Space","inLanguage":"en","publisher":{"@type":"Organization","name":"daily.dev","url":"https://daily.dev","logo":{"@type":"ImageObject","url":"https://daily.dev/apple-touch-icon.png","width":180,"height":180}},"author":{"@type":"Organization","name":"Latent Space","logo":"https://media.daily.dev/image/upload/s--DnJ9laFj--/f_auto,q_auto/v1780213196/logos/latentspace?_a=BAMAMiWQ0","url":"https://daily.dev/sources/latentspace"},"commentCount":0,"discussionUrl":"https://daily.dev/posts/ontologies-are-so-back-why-ai-agents-are-reviving-the-semantic-web-lpzicnimt","interactionStatistic":[{"@type":"InteractionCounter","interactionType":{"@type":"LikeAction"},"userInteractionCount":0},{"@type":"InteractionCounter","interactionType":{"@type":"CommentAction"},"userInteractionCount":0}],"keywords":"ai-agents","timeRequired":"PT6M"} {"@context":"https://schema.org","@type":"BreadcrumbList","itemListElement":[{"@type":"ListItem","position":1,"name":"Home","item":"https://daily.dev"},{"@type":"ListItem","position":2,"name":"Latent Space","item":"https://daily.dev/sources/latentspace"},{"@type":"ListItem","position":3,"name":"Ontologies Are So Back: Why AI Agents Are Reviving the Semantic Web"}]} ```