Koog 1.0 Is Out: Stable Core, Better Interop, and Multiplatform Observability
JetBrains has released Koog 1.0, an open-source framework for building AI agents in Kotlin and Java. This version emphasizes stability and introduces several major improvements, including better interop and observability features. Koog 1.0 aims to provide a reliable foundation for developers creating enterprise-ready applications.
- ▪Koog 1.0 guarantees no breaking changes for stable modules for at least one year.
- ▪The release includes support for running LiteRT models locally on Android devices.
- ▪Koog 1.0 features a redesigned Java interop layer with a cleaner API.
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Record
| Original publisher | JetBrains Blog |
| Canonical URL | https://blog.jetbrains.com/ai/2026/05/koog-1-0-is-out-stable-core-better-interop-and-multiplatform-observability/ |
| Publication time | Wed, 27 May 2026 08:53:10 +0000 |
| Retrieval time | 2026-05-27T09:07:56.948Z |
| Last seen | 2026-05-27T09:07:56.948Z |
| 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 | -lYyf8Cs17Kh |
| 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)
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| 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
JetBrains AI Supercharge your tools with AI-powered features inside many JetBrains products Follow Follow: RSS RSS Explore More All News How-To's AI in IDEs Research AI Java Kotlin Koog 1.0 Is Out: Stable Core, Better Interop, and Multiplatform Observability Alyona Chernyaeva Last week at the KotlinConf 2026 keynote (watch the recording here), we announced Koog 1.0. Koog is JetBrains’ open-source framework for building AI agents in Kotlin and Java. It provides the core building blocks for agentic applications: tools, workflows, persistence, memory, observability, and integrations with existing JVM and Kotlin Multiplatform projects. We introduced Koog at KotlinConf last year. Since then, the framework has evolved through community feedback, internal use, and several public releases.
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Excerpt limited to ~120 words for fair-use compliance. The full article is at JetBrains Blog.