[Lushiyao5]

Closes #9814

Embedding clients were left out of the deterministic lifecycle that #9748 gave chat clients: BaseEmbeddingClient had no __aenter__/__aexit__/close(), so async with did not work for any embedding client, and internally created SDK clients (OpenAI httpx connection pools, Ollama httpx transports) were only ever released by GC.

Change

• BaseEmbeddingClient (core): async context manager plus a no-op close() default, mirroring BaseChatClient — entering the context is never required for ordinary requests, and resource-owning implementations override close().
• OpenAIEmbeddingClient: tracks _owns_client = async_client is None; close() awaits client.close() only when the SDK client was created internally (via load_openai_service_settings), covering both the OpenAI and Azure paths.
• OllamaEmbeddingClient: the same ownership pattern; close() awaits AsyncClient.aclose().

Caller-supplied clients always stay open — their lifecycle belongs to the caller. GeminiEmbeddingClient already implemented this pattern and is untouched. Bedrock's boto3 runtime client has no close() surface, so it keeps the base no-op.

Tests

• core (test_embedding_client.py): the async context manager protocol works on the base and the default close() is a no-op;
• openai (test_openai_embedding_client.py): close() releases an internally created client and leaves a caller-supplied one unawaited;
• ollama suite passes unchanged with the ownership tracking in place.

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[Copilot]

🟡 Changes recommended

Internally created Ollama clients raise AttributeError during cleanup because AsyncClient has no close() method, leaving the HTTP transport open.

1 open issue

• Close the underlying Ollama transport instead of calling nonexistent close() · New

What changed in this PR

Extends the Python chat-client lifecycle pattern to embedding clients, adding optional context management and ownership-aware cleanup to address #9814.

Changes:

• Adds async context management and a default no-op close() to BaseEmbeddingClient.
• Adds ownership tracking and cleanup methods to OpenAI and Ollama embedding clients.
• Adds tests for the base lifecycle and OpenAI client ownership.

File	Description
python/​packages/​openai/​tests/​openai/​test_openai_embedding_client.py	Tests cleanup of owned clients and preservation of caller-supplied clients.
python/​packages/​openai/​agent_framework_openai/​_embedding_client.py	Adds ownership-aware OpenAI SDK cleanup.
python/​packages/​ollama/​agent_framework_ollama/​_embedding_client.py	Adds ownership tracking and a cleanup override.
python/​packages/​core/​tests/​core/​test_embedding_client.py	Tests context entry and default no-op cleanup.
python/​packages/​core/​agent_framework/​_clients.py	Defines the shared embedding-client lifecycle methods.

_{Review effort: Balanced}