Hail.so

Multi-language calls and a more natural-sounding voice agent.

Component versions cut alongside this release:
sdk-v0.12.0 (PyPI: hail-sdk==0.12.0), cli-v0.15.0 (Homebrew + GitHub Releases).

Multi-language calls

• POST /calls accepts voice_config.language (lowercase ISO 639-1, e.g. "fr"). The voicebot pins both STT (Deepgram) and TTS (Cartesia / ElevenLabs) to the requested language on every instance it builds — BYO and house fallbacks alike — so a provider failover never flips the call back to English. Omitted: English defaults, as before.
• Exposed end to end: SDK VoiceConfig.language, CLI hail call --language fr, MCP place_call(language=...). OpenAPI spec and the generated Go client regenerated.

Voice agent realism

• The voicebot's non-overridable preamble is restructured per LiveKit's prompting guide (Identity / Output rules / Sounding natural / Conversational flow / Tools / Guardrails): natural fillers and punctuation-driven pauses, occasional mid-sentence self-corrections, varied turn openers, a calm emotion baseline, automated-menu (IVR) keypad guidance, and first-class tool rules — confirm before sending SMS/email, state failures once, summarize tool results instead of reciting raw data.