There were some additions to Chat and Language Models in vscode 1.95:

• ChatRequestTurn#toolReferences added readonly property
• ChatRequest additions: toolReferences, toolInvocationToken and model readonly properties
• LanguageModelChatMessage updates: content is now only a string anymore but also (LanguageModelTextPart | LanguageModelToolResultPart | LanguageModelToolCallPart)[]
• LanguageModelChatResponse#stream property added
• LanguageModelChatRequestOptions tools and toolModel added optional properties
• Added methods in language model namespace
  -LanguageModelChatTool, LanguageModelChatToolMode, LanguageModelToolCallPart, LanguageModelToolResultPart, LanguageModelTextPart, LanguageModelPromptTsxPart, LanguageModelToolResult, ChatParticipantToolToken, LanguageModelToolInvocationOptions, LanguageModelToolTokenizationOptions, LanguageModelToolInformation, LanguageModelToolInvocationPrepareOptions, LanguageModelTool<T>, LanguageModelToolConfirmationMessages, PreparedToolInvocation, ChatLanguageModelToolReferenceadded types

All those APIs shall be properly stubbed, as done in #13778