traceBiFunction

Wraps a 2-arg [BiFunction] with LangSmith tracing. This is the recommended entry point for Java callers (2-arg). It avoids the overload-resolution ambiguity that can occur with [traceable] when Kotlin function types are on the classpath. Kotlin callers should prefer [traceable] directly.

TraceConfig config = TraceConfig.builder()
    .name("combine")
    .client(LangsmithOkHttpClient.fromEnv())
    .build();
BiFunction traced =
    Tracing.traceBiFunction((a, b) -> a + " " + b, config);
String result = traced.apply("hello", "world");