Add changelog for 2025-06-25

[quantstruct-bot]

Description

Custom Models, Enhanced Campaigns, and MCP Tool Improvements

**Bring your own hosted LLMs and Google Gemini models** to workflows with new [`WorkflowCustomModel`](https://api.vapi.ai/api#:~:text=WorkflowCustomModel) and [`WorkflowGoogleModel`](https://api.vapi.ai/api#:~:text=WorkflowGoogleModel) objects. Control payload structure for advanced integrations and expand your model choices beyond OpenAI. **Gain deeper insight into campaign performance** with new call counters including `callsCounterQueued`, `callsCounterScheduled`, `callsCounterInProgress`, and `callsCounterEndedVoicemail` for comprehensive campaign tracking. **Flexible tool integrations** with new [`McpToolMetadata`](https://api.vapi.ai/api#:~:text=McpToolMetadata) field. Select between Server-Sent Events (`sse`) or Streamable HTTP (`shttp`) protocols for tool communication. **Create support tickets directly through Vapi ** using the new [`/support/ticket`](https://api.vapi.ai/api#:~:text=SupportTicket) endpoint, simplifying how you request assistance.

1. Multilingual LMNT Voice Support: The LMNTVoice and FallbackLMNTVoice objects now support a language property (ISO 639-1 or auto) for selecting or auto-detecting spoken language in synthesized voices.

2. Assistant Overrides in Chats: The assistantOverrides property is now available in Chat, CreateChatDTO, and OpenAIResponsesRequest, allowing you to dynamically override assistant settings and template variables per chat session.

3. New API Endpoints and Objects: Added POST /workflow/generate endpoint for workflow generation with tool IDs, plus new objects including GenerateWorkflowDTO and enhanced CreateMcpToolDTO/UpdateMcpToolDTO with metadata support.

4. Include Messages in Server Response from Transfer Requests: When transferring calls, you can now include a message to communicate with users during the process with ServerMessageResponse.message.message.

5. Org Concurrency Limit Deprecated: The concurrencyLimit field in Org, CreateOrgDTO, and UpdateOrgDTO is now marked as deprecated.

**Breaking Change**: The `codeSwitchingEnabled` property has been removed from Deepgram transcribers. If you're currently using this property in your Deepgram transcriber configurations, you'll need to remove it to avoid errors. **Breaking Change**: The `'aws-sts'` type is no longer supported in [`OAuth2AuthenticationPlan`](https://api.vapi.ai/api#:~:text=OAuth2AuthenticationPlan). If you're currently using this type in your OAuth2 authentication configurations, you'll need to update it to avoid errors.

Testing Steps

• [x ] Run the app locally using fern docs dev or navigate to preview deployment
• [ x] Ensure that the changed pages and code snippets work

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