koog

Published 28 January 2026

Major Features

Block of changes:

• Converse API support in Bedrock LLM client: Added support for the Converse API in the Bedrock LLM client, enabling richer prompt-based interactions (KG-543, #1384)
• Tool choice heuristics: Introduced heuristic-based required tool selection via `LLMBasedToolCallFixProc...

Published 22 December 2025

Major Features

• ACP Integration: Introduce initial ACP (Agent Communication Protocol) integration to create ACP-compatible agents in Koog (#1253)
• Planner Agent Type: Introduce new "planner" agent type with iterative planning capabilities. Provide two out-of-the box strategies: simple LLM planner and GOAP (Goal-Oriented Action Planning) (#1232)
• *...

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 Bedroc...

Published 12 November 2025

New Features

• Reasoning messages support (#943)
• Add get models list request to OpenAI-based LLMClients (#1074)

Improvements

• Support subgraph execution events in an agent pipeline and features, including OpenTelemetry (#1052)
• Make systemPrompt and temperature optional, set default temperature to null in AIAgent factory functions (#1078...

Published 29 Oct 2025

New Features

• Add subtask extension for non-graph agents similar to subgraphWithTask (#982)
• Add MistralAI LLM Client (#622)

Improvements

• Replace string content and attachments list in messages with a unified content parts list to make the API more flexible and preserve text/attachment parts order (#1004)
• Add input and output attributes to the Node...