Description

Many businesses use cloud providers to protect their sensitive data enterprise contracts. We want to support that.

Tasks

• Client: The providers should be added to src/Cellm/Models/ServiceCollectionExtensions.cs and registered for dependency injection in src/Cellm/AddIn/CellmAddIn.cs. The Azure provider should use the https://github.com/dotnet/extensions/tree/main/src/Libraries/Microsoft.Extensions.AI.AzureAIInference nuget package. The AWS provider should the https://www.nuget.org/packages/AWSSDK.Extensions.Bedrock.MEAI nuget package. The Google provider should use the OpenAI client under the hood. See https://cloud.google.com/vertex-ai/generative-ai/docs/migrate/openai/overview
• Configuration: The providers need a configuration file and an entry in appsettings.json. Look at existing implementations for inspiration. At this point you should be able to send prompts to the providers with e.g. =PROMPTWITH("Google/gemini-2.5-pro-preview-05-06", A1, "Extract person names"). See also https://cloud.google.com/vertex-ai/generative-ai/docs/migrate/openai/overview.
• UI: The providers needs to be added to the ribbon UI in the same way that other providers are in src/Cellm/AddIn/UserInterface/Ribbon/RibbonModelGroup.cs. And they need a logo.

Acceptance Criteria

• The user should be able to select a provider from the providers drop-down list and successfully send a request.