Koog 1.0 idioms, gotchas, and scaffolding skills for Kotlin agents on the JVM
88
88%
Does it follow best practices?
Impact
88%
1.95xAverage score across 43 eval scenarios
Passed
No known issues
A developer has a working Koog 1.0 agent in Kotlin. They want the agent to be able to look up the current weather for a city. They already have a function in their project that does the network call:
fun fetchWeather(city: String, units: String): String {
// Existing implementation returns a human-readable string like
// "Lisbon: 22°C, partly cloudy"
}They want this function exposed to the LLM so the agent can call it when a user asks about weather. They mention they'd like it to be straightforward — "nothing fancy, just expose the function."
Walk through how to expose the function to the agent. Produce the modified source files in a single response, with each file labeled.
evals
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skills
add-observability
add-persistence
add-rag
add-structured-output
add-token-budgeting
add-tool
cache-llm-calls
define-prompt
domain-model-subtask-pipeline
references
enable-prompt-caching
handle-agent-events
manage-state
migrate-from-0-x
model-planner-subtasks
persist-chat-history
query-sql-from-agent
scaffold-agent
snapshot-and-restore
test-koog-agents
trace-agent-internals
use-attachments
use-functional-agent
use-llm-node-variants
use-planner
wire-a2a
wire-acp-server
wire-ktor-server
wire-mcp-server
wire-spring-boot