Add Python LangChain sample agent#270

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Yogeshp-MSFT wants to merge 7 commits intomicrosoft:mainfrom

Yogeshp-MSFT:LangchainNew-sample

Commits on Apr 15, 2026

feat: Add sample LangChain agent(Python) with Microsoft A365 integration
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fix: improve error handling and logging in agent message processing
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Update python/langchain/sample-agent/agent_interface.py

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Update python/langchain/sample-agent/README.md

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Update python/langchain/sample-agent/README.md

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feat: Enhance observability integration with token caching and error handling
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feat: Add token caching utilities for Agent 365 Observability exporter authentication
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