Unit 11 · Ship AI systems you can operate

Fall back without changing your app contract

You route across models by capability, health, latency, price, or application policy. A fallback preserves the typed contract and remains observable.

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Unit example (nearest native match)

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axllm.SetRateLimiter(globalLimiter)
axllm.SetTracer(tracer)
axllm.SetMeter(meter)
workflow.ForwardWithHooks(ctx, client, input, nil, axllm.AxRuntimeHooks{RateLimiter: callLimiter, Tracer: tracer, Meter: meter})
axllm.SetRateLimiter(nil); axllm.SetTracer(nil); axllm.SetMeter(nil)

Run itIn your own project

go get github.com/ax-llm/ax/packages/go

package main

import (
    "context"
    "fmt"
    "os"

    axllm "github.com/ax-llm/ax/packages/go"
)

func main() {
    client := axllm.NewAI("openai", map[string]axllm.Value{"apiKey": os.Getenv("OPENAI_API_KEY")})
    classify := axllm.NewAx("review:string -> sentiment:class \"positive, negative, neutral\"", nil)
    result, err := classify.Forward(context.Background(), client, map[string]axllm.Value{
        "review": "Useful and boring in the best way."
    }, nil)
    if err != nil {
        panic(err)
    }

    fmt.Println("sentiment:", result.(map[string]axllm.Value)["sentiment"])
}

Set OPENAI_APIKEY in your environment before running provider-backed code.

In the ax repo

From a clone of the ax repo:

npm run example -- go src/examples/go/long-agents/smart_defaults_agent.go

Active practice

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