Ax Cpp Audio

---
name: "ax-cpp-audio"
description: "Use when writing C++ code with `axllm` for audio input/output, OpenAI Responses audio mapping, realtime event folding, and generated package audio examples."
version: "25.0.0"
---
# Ax Audio And Realtime For C++

This skill helps an agent write C++ code with the generated Ax package `axllm`. Use the generated package API, examples, and manifests; do not import TypeScript-only APIs unless you are editing the TypeScript package.

## When To Use

- Map speech, transcription, or realtime events through the generated provider surface.
- Use no-key examples for event folding and provider request mapping.
- Keep live provider calls behind explicit credentials and provider-api examples.

## Package Facts

- Language: C++.
- Package: `axllm`.
- Package API docs: `API.md` and `axir-api.json`.
- Capability manifest: `axir-capabilities.json`.
- Runnable examples: `examples/`.
- Real network support: yes.
- Scripted no-key transport support: yes.
- Runtime profiles: `javascript-quickjs`, `python-pyodide`.

## Core Pattern

```cpp
#include "axllm/axllm.hpp"

auto llm = axllm::ai("openai", { {"apiKey", std::getenv("OPENAI_API_KEY")} });
```

## Speech And Audio Fields

- `speak()` returns TypeScript's speech result keys: `data` (base64 audio), `format`, `mimeType`, `transcript` (the spoken text), and `sampleRate` / `channels` when the mime type gives them. The older keys `audio`, `mime_type`, and `sample_rate` are removed.
- As in TypeScript, a binary speech body's Content-Type is its `mimeType` (else the format's mime type), and a JSON body (by its Content-Type) is read from `audio_data`, `audioData`, `data`, `audio.data`, `output.audio.data`, or a Gemini part's inline data. A JSON body with a bare string under `audio`, or without an audio data field, raises TypeScript's error.
- Speak requests match TypeScript: OpenAI defaults to `gpt-4o-mini-tts` with the `alloy` voice, sends a `{ id }` voice by its id, sends `speed` when set, and asks for `pcm` when the format is `pcm16`; Mistral defaults to `voxtral-mini-tts-2603` and sends the voice as `voice_id`; Grok sends `speed` when set.
- The renderer calls `AIClient::speak(request, options)`: `AxAIService` clients speak, and the base `AIClient` throws.
- An AxGen `audio` output field becomes speech with the `renderAudio` / `render_audio` option (see the gen skill): the field then holds the `speak()` result, with the spoken text as its `transcript`.
- An agent's `audio` output fields render the same way when `renderAudio` / `render_audio` is set on the agent, its `responderOptions`, or the forward call (the call's wins); as in TypeScript, the responder's `speak()` request takes the forward call's `speech` or `responderOptions.speech`, not a top-level `speech` option.
- An audio input that is a string, or an audio object with a string `transcript` (a rendered audio output), reaches the model as text. Audio without a transcript goes as an audio part with only its `format` (`wav` when it has none) and `data`.

## Relevant API Surface

- AxAI: `axllm::ai`, `axllm::typesafe`, `axllm::AxAITypesafeClient`, `axllm::AxCancellationToken`, `axllm::AxAIServiceAbortedError`, `axllm::get_supported_ai_models`, `axllm::AxCredentialRequest`, `axllm::AxCredentialProvider`, `axllm::AIClient::owned_worker_factory`, `axllm::AxChatSession`, `axllm::AxStreamHandler`, `axllm::OpenAICompatibleClient`, `axllm::OpenAIResponsesClient`, `axllm::GoogleGeminiClient`, `axllm::AnthropicClient`, `axllm::AxUsageContext`, `axllm::AxUsageEvent`, `axllm::AxUsageObserver`, `axllm::set_usage_observer`, `axllm::AxRuntimeHooks`, `axllm::AxRateLimitInfo`, `axllm::AxRateLimiter`, `axllm::AxTracer`, `axllm::AxMeter`, `axllm::AxGlobals`, `axllm::set_rate_limiter`, `axllm::set_tracer`, `axllm::set_meter`, `axllm::AxBalancer`, `axllm::AxBalancerAdaptiveStrategy`, `axllm::AxBalancerStatsStore`, `axllm::AxInMemoryBalancerStatsStore`, `axllm::create_balancer_route_stats`, `axllm::update_balancer_route_stats`, `axllm::sample_balancer_route_health`, `axllm::MultiServiceRouter`, `axllm::ProviderRouter`

## Guardrails

- Start from package examples for exact native syntax before inventing a new call shape.
- Use `provider-api` examples only when the user explicitly has provider credentials available.
- Use `no-key` examples for deterministic local checks and provider request mapping.
- Treat AxIR as the source of generated package truth: if package docs disagree with source code, update the compiler and regenerate packages.
- Do not copy repo-maintainer skills from `tools/*/skills/` into user packages.