Kotlin functions that answer questions about text

A KotlinFacade over the Java door. Its calls take strings.

Install

Channel	Note
`io.github.botassembly:thinkthen-jvm:VERSION:kotlin`	The Kotlin JAR. Add the Java coordinate beside it.
`thinkthen-jvm-VERSION-TARGET.tar.gz`	The door, Kotlin and Scala JARs, from each release.
`thinkthen-c-VERSION-TARGET.tar.gz`	The C library it calls, from the same release.

Set THINKTHEN_API_KEY in the environment.

A first call

import thinkthen.Door
import thinkthen.Door.Outcome

fun main() {
    Door().use { engine ->
        val tt = KotlinFacade(engine)
        val question =
            "Does the customer ask for a refund?"
        var isRefund = tt.decide(
            question,
            "Please refund my order. It arrived broken.",
        )
        check(Door.outcome(isRefund.value()) == Outcome.YES)

        val refund = """
            {"decide": "$question",
             "threshold": "0.2:0.8"}
        """.trimIndent()
        isRefund = tt.decide(
            refund,
            "I want to send this back.",
        )
        val outcome = Door.outcome(isRefund.value())
        check(outcome == Outcome.NOT_SURE)
    }
}

Build and run it beside the unpacked archives, thinkthen-c/ and thinkthen-jvm/

kotlinc -jvm-target 21 \
    -cp thinkthen-jvm/thinkthen-door.jar:thinkthen-jvm/thinkthen-kotlin.jar \
    FirstCall.kt -include-runtime -d FirstCall.jar
java --enable-preview -ea \
    --enable-native-access=ALL-UNNAMED \
    -Dthinkthen.library="$PWD/thinkthen-c/lib/libthinkthen.so" \
    -cp thinkthen-jvm/thinkthen-door.jar:thinkthen-jvm/thinkthen-kotlin.jar:FirstCall.jar \
    FirstCallKt

Not sure comes back as Outcome.NOT_SURE. Branch on it and send those cases to a person.

Run facts

decide returns the door's TypedResult. value() holds the answer, and facts() holds this call's run facts as a Map.

Errors

A failed call throws a Door.NativeFailure, as in Java. Its failure names the kind, the message and the retry flag.

Settings and recording

Door(settingsJson) takes the settings as JSON. "record" writes a recording to a folder. "replay" answers from that recording with no connection. The Settings page lists every setting.

Jev, Liquid d1 and Ollama from Kotlin

Kotlin reads its backend from the environment. Set THINKTHEN_BACKEND to the name below. Set the backend's key variable in the shell, and the same sample asks that backend.

Backend	Name	Key variable
TypeSafe Jev	`typesafe`	`TYPESAFE_API_KEY`
Liquid d1	`liquid`	`LIQUIDAI_API_KEY`, then `LIQUID_API_KEY`
Ollama	`ollama`	`OLLAMA_API_KEY`. A local address needs no key.

Ask TypeSafe Jev.

export THINKTHEN_BACKEND=typesafe
export TYPESAFE_API_KEY=...

Ask Liquid d1.

export THINKTHEN_BACKEND=liquid
export LIQUIDAI_API_KEY=...

Ask Ollama. This block names a second port, 11535, as the site's runs do. On the default port, leave THINKTHEN_BASE_URL out.

export THINKTHEN_BACKEND=ollama
export THINKTHEN_BASE_URL=http://localhost:11535/v1

import thinkthen.Door
import thinkthen.Door.Outcome

fun main() {
    Door().use { engine ->
        val tt = KotlinFacade(engine)
        val question =
            "Does the customer ask for a refund?"
        val brokenIsRefund = tt.decide(
            question,
            "Please refund my order. It arrived broken.",
        )
        val thanksIsRefund = tt.decide(
            question,
            "Thanks for the quick help yesterday!",
        )
        val broken = Door.outcome(brokenIsRefund.value())
        val thanks = Door.outcome(thanksIsRefund.value())
        check(broken == Outcome.YES)
        check(thanks == Outcome.NO)
    }
}

Build and run it beside the unpacked archives, thinkthen-c/ and thinkthen-jvm/

kotlinc -jvm-target 21 \
    -cp thinkthen-jvm/thinkthen-door.jar:thinkthen-jvm/thinkthen-kotlin.jar \
    Backends.kt -include-runtime -d Backends.jar
java --enable-preview -ea \
    --enable-native-access=ALL-UNNAMED \
    -Dthinkthen.library="$PWD/thinkthen-c/lib/libthinkthen.so" \
    -cp thinkthen-jvm/thinkthen-door.jar:thinkthen-jvm/thinkthen-kotlin.jar:Backends.jar \
    BackendsKt

The configuration file's backend names a default backend for every run. The Configuration page shows the file.

OpenAI Decisions API from Kotlin

OpenAI announced its Decisions API on 2026-09-29 in its DevDay 2026 recap. OpenAI has published no address, schema or price, so ThinkThen cannot call it. The OpenAI Decisions API page says what ThinkThen knows.

What is different in Kotlin

decideAsync runs a call on its own thread. await() gives the answer. Close it before the door.
The run takes the same java flags as Java: --enable-preview and -Dthinkthen.library.

On GitHub: github.com/botassembly/thinkthen