JetBrains/koog 0.5.4

on GitHub

Published 03 December 2025

Improvements

• LLM clients: better error reporting (#1149). Potential breaking change: LLM clients now throw LLMClientException instead of IllegalStateException (KG-552)
• Add support for OpenAI GPT-5.1 and GPT-5 pro (#1121) and (#1113) and Anthropic Claude Opus 4.5 (#1199)
• Add Bedrock support in Ktor for configuring and initializing Bedrock LLM clients. (#1141)
• Improve Bedrock moderation implementation (#1105)
• Add handler for GooglePart.InlineData in GoogleLLMClient (#1094) (KG-487)
• Improvements in ReadFileTool (#1182) and (#1213)

Bug Fixes

• Fix and simplify McpTool to properly support updated Tool serialization (#1128)
• Fix file tools to properly use newer API to provide textual tool result representation (#1201)
• Fix empty list condition check in onMultipleToolResults and onMultipleAssistantMessages (#1192)
• Fix reasoning message handling in strategy (#1166)
• Fix timeout in JvmShellCommandExecutor (#1005)