vapi4k-core

Assistant configuration interfaces — models, transcribers, voices, functions, overrides, analysis/artifact plans, and voicemail detection.

Button UI configuration, state, color, position, and type definitions.

Outbound call abstractions, phone configurations, and Vapi API object types.

Condition operators for conditional logic in tool messages and workflows.

Transfer destination types (number, SIP, assistant, step) and destination mode configurations.

Interface for defining callable functions on assistants.

LLM provider abstractions for all 10 providers (OpenAI, Anthropic, Groq, DeepInfra, Anyscale, TogetherAI, OpenRouter, PerplexityAI, CustomLLM, Vapi) and knowledge base configuration.

Prompt interface for system instructions and message templates.

Response interfaces for inbound/outbound calls, web interactions, and built-in tools (end call, DTMF, voicemail).

Squad configuration and member definitions for multi-assistant setups.

Tool abstractions (manual, external, service-based), tool messages, transfer tool, @ToolCall/@Param annotations, and tool conditions.

ToolCallService base class and completion/failure condition interfaces for dynamic post-invocation messages.

Transcriber provider abstractions (Deepgram, Gladia, Talkscriber) with language and model types.

Core application types (InboundCallApplication, OutboundCallApplication, WebApplication), Vapi4kConfig, RequestContext, ResponseContext, and ServerRequestType.

Voice provider abstractions for all 9 providers (OpenAI, ElevenLabs, Deepgram, Azure, Cartesia, PlayHT, RimeAI, LMNT, Neets) with voice IDs and model types.

Web interaction abstractions including HTTP method types and talk button UI.