SpeakTextTool

Speaks text aloud through the device TextToSpeech engine, suspending until playback completes. No permissions required.

Initializes a one-shot engine, applies pitch/speed (each clamped to 0.5–2.0) and language (falls back to English if the requested BCP-47 tag is unsupported or missing data), speaks with QUEUE_FLUSH, then shuts the engine down. Cancelling the coroutine shuts down the engine.

Output map (on completion): success (true), text_length (Int), language (the requested tag, not necessarily the one actually used after fallback).