Added embedding API to C#, JS, Python and Rust SDKs

[phanindraraja]

Summary

Adds embedding support to all four Foundry Local SDKs (C#, JavaScript, Python, Rust), enabling text embedding generation through the OpenAIEmbeddingClient via the FoundryLocalCore native interop layer. Supports both single and batch input.

Changes

C# SDK

• OpenAIEmbeddingClient — Client with GenerateEmbeddingAsync(string) for single input and GenerateEmbeddingsAsync(IEnumerable<string>) for batch. Configurable via EmbeddingSettings (Dimensions, EncodingFormat).
• EmbeddingRequestResponseTypes.cs — Request DTO extending Betalgo's EmbeddingCreateRequest with FromUserInput() factory for both single and batch. Response deserialization with null-check and error handling.
• IModel.GetEmbeddingClientAsync() — New interface method, implemented in Model and ModelVariant.
• JsonSerializationContext — Registered EmbeddingCreateRequestExtended and EmbeddingCreateResponse for AOT.

JavaScript SDK

• EmbeddingClient — Client with generateEmbedding(string) and generateEmbeddings(string[]). Settings with encodingFormat validation. Shared executeRequest() for both paths.
• IModel.createEmbeddingClient() — Factory method in interface, Model, and ModelVariant.
• Exported from index.ts.

Python SDK

• EmbeddingClient — Client with generate_embedding(str) and generate_embeddings(List[str]). Uses OpenAI SDK types (EmbeddingCreateParams for request, CreateEmbeddingResponse for response). Settings with encoding_format validation via _serialize(). Patches server response to add missing object and usage fields required by the OpenAI SDK type.
• IModel.get_embedding_client() — Abstract method, implemented in Model and ModelVariant.
• Exported from openai/__init__.py.

Rust SDK

• EmbeddingClient — Client with generate_embedding(&str) and generate_embeddings(&[&str]). Uses async_openai::types::embeddings::CreateEmbeddingResponse as return type. Patches server response for missing object and usage fields. Settings with encoding_format validation. Builder pattern for dimensions() and encoding_format().
• Model.create_embedding_client() — Factory method in Model and ModelVariant.
• Added "embedding-types" feature to async-openai dependency.

Tests

All SDKs include tests for:

• Basic embedding generation (1024 dimensions, correct response structure)
• L2 normalization (norm ≈ 1.0, values within [-1, 1])
• Different inputs produce different embeddings (cosine similarity < 0.99)
• Same input produces identical embeddings (determinism)
• Batch embedding (multiple inputs → multiple results with correct indices)
• Batch results match single-input results
• Input validation (empty input, empty list)
• Known golden values (C# only)

Documentation

• All four SDK READMEs updated with embeddings feature, usage examples, and settings documentation.
• C# API docs (index.md, imodel.md, model.md, modelvariant.md, openaiembeddingclient.md).
• JS docs (README.md class index).
• Rust API docs (docs/api.md with EmbeddingClient, EmbeddingResponse, EmbeddingData reference).
• Python API reference table updated.

Test plan

• C# SDK tests pass
• Python SDK tests pass
• JS SDK tests pass
• Rust SDK tests pass
• All existing chat/audio tests unaffected

Dependencies

This PR depends on the FoundryLocalCore (neutron-server) PR that adds the "embeddings" NativeInterop command, /v1/embeddings endpoint, and batch support:
https://microsoft.visualstudio.com/windows.ai.toolkit/_git/neutron-server/pullrequest/15212502

[vercel]

Someone is attempting to deploy a commit to the MSFT-AIP Team on Vercel.

A member of the Team first needs to authorize it.

[Copilot]

Pull request overview

Adds an embeddings capability to the Foundry Local C# SDK, aligning it with the existing OpenAI-compatible chat and audio clients and exposing it through the model abstraction.

Changes:

• Introduces OpenAIEmbeddingClient with request/response serialization helpers and JSON source-gen registrations.
• Exposes embeddings via IModel.GetEmbeddingClientAsync() and implements it on Model / ModelVariant with loaded-model enforcement.
• Adds test coverage plus README/API docs updates for the new embeddings surface.

Reviewed changes

Copilot reviewed 13 out of 13 changed files in this pull request and generated 6 comments.

Show a summary per file

File	Description
sdk/cs/src/OpenAI/EmbeddingClient.cs	Adds OpenAIEmbeddingClient and the public embeddings API surface.
sdk/cs/src/OpenAI/EmbeddingRequestResponseTypes.cs	Adds embeddings request DTO + response parsing/serialization helpers.
sdk/cs/src/IModel.cs	Adds GetEmbeddingClientAsync to the public model interface.
sdk/cs/src/Detail/Model.cs	Wires GetEmbeddingClientAsync through to the selected variant.
sdk/cs/src/Detail/ModelVariant.cs	Implements GetEmbeddingClientAsync with “must be loaded” validation.
sdk/cs/src/Detail/JsonSerializationContext.cs	Registers embeddings request/response types for STJ source generation.
sdk/cs/test/FoundryLocal.Tests/EmbeddingClientTests.cs	Adds embeddings integration tests (basic, normalization, determinism, known values).
sdk/cs/README.md	Documents embeddings feature and shows usage + settings.
sdk/cs/docs/api/microsoft.ai.foundry.local.openaiembeddingclient.md	Adds generated API docs for OpenAIEmbeddingClient.
sdk/cs/docs/api/microsoft.ai.foundry.local.imodel.md	Updates generated API docs for IModel with embeddings accessor.
sdk/cs/docs/api/microsoft.ai.foundry.local.model.md	Updates generated API docs for Model with embeddings accessor.
sdk/cs/docs/api/microsoft.ai.foundry.local.modelvariant.md	Updates generated API docs for ModelVariant with embeddings accessor.
sdk/cs/docs/api/index.md	Adds OpenAIEmbeddingClient to the API docs index.

---

💡 Add Copilot custom instructions for smarter, more guided reviews. Learn how to get started.

[Copilot]

Pull request overview

Copilot reviewed 13 out of 13 changed files in this pull request and generated 4 comments.

---

💡 Add Copilot custom instructions for smarter, more guided reviews. Learn how to get started.

[Copilot]

Pull request overview

Copilot reviewed 13 out of 13 changed files in this pull request and generated 2 comments.

---

💡 Add Copilot custom instructions for smarter, more guided reviews. Learn how to get started.