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How to test agent skills without hitting real APIs

Your agent skill calls an API. The moment you start evaluating it, every run either costs money or mutates production data. Learn how to mock APIs transparently so you can run evals without changing your skill or hitting real endpoints.
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Jul 6, 2026
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Need a different partition key in Azure Cosmos DB? Pick the right approach

Abhishek Gupta
Once you create a container, its partition key is fixed at creation, and you can’t change it in place. However, if your original key starts causing problems like cross-partition queries or hot partitions, you need to consider your options for changing it. This post explains the...
Azure Cosmos DB Blog
Jul 6, 2026
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Not all model upgrades are upgrades

Waldek Mastykarz
A new model drops with lower per-token pricing and better benchmarks. You switch. A week later someone asks why the agent is burning 12x more tokens on the same task while producing worse output. We ran 150 agent tasks across 15 scenarios on two models, Claude Sonnet 4.6 and Claude...
Microsoft for Developers
Jul 6, 2026
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How Prompt Tuning Improved GPT-5.5 in VS Code

VS Code Team
See how VS Code and OpenAI tested GPT-5.5 system prompt changes in a two-week experiment, cutting tool calls and tail-end token usage while speeding up edits. Read the full article
VS Code Blog
Jul 5, 2026
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Azure SDK Release (June 2026)

Justin Bettencourt
Azure SDK releases every month. In this post, you'll find this month's highlights and release notes.
Azure SDK Blog
Jul 3, 2026
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How did we conclude that CcNamespace.dll was the ringleader of a group of DLLs that unloaded prematurely?

Raymond Chen
Contextual clues.
The Old New Thing
Jul 3, 2026
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Enabling MLflow OpenAI Autolog on PySpark Workers

Jaya Kumar
When distributing LLM calls across PySpark workers via mapInPandas, MLflow autolog silently fails. Here is how to fix it.
ISE Developer Blog
Jul 2, 2026
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Pure Virtual C++ 2026 Talks Announced

Marian Luparu
The featured talks for Pure Virtual C++ 2026 are here! Join us on July 21 for a free, one-day virtual conference for the whole C++ community.
C++ Team Blog
Jul 2, 2026
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The case of the thread executing from an unloaded third-party DLL

Raymond Chen
Oops, I didn't realize that I was still doing that.
The Old New Thing
Jul 2, 2026
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Fundamentals of Azure DevOps with SQL projects

Drew Skwiers-Koballa
Building automated pipelines with your SQL database projects enables you to build a rich CI/CD ecosystem to ensure that your application is being deployed with good quality code and at high confidence of success. SQL Database Projects are compatible with just about every automation...
Azure SQL Dev Corner