# The hidden variables in your agent eval

DevFeed: [The hidden variables in your agent eval](<https://devfeed.tech/articles/the-hidden-variables-in-your-agent-eval-23834.md>)

Original publisher: [Read original article](<https://devblogs.microsoft.com/blog/the-hidden-variables-in-your-agent-eval/>)

Author: Waldek Mastykarz

Published: 2026-07-08T12:11:17Z

Content type: article

Language: en

Sources: [Developer Blogs](<https://devfeed.tech/sources/developer-blogs.md>)

Topics: [AI-assisted coding](<https://devfeed.tech/topics/ai-assisted-coding.md>), [context](<https://devfeed.tech/topics/context.md>), [Operating system](<https://devfeed.tech/topics/operating-system.md>), [Shell](<https://devfeed.tech/topics/shell.md>)

Tags: [agent](<https://devfeed.tech/tags/agent.md>), [agent-experience](<https://devfeed.tech/tags/agent-experience.md>), [ai](<https://devfeed.tech/tags/ai.md>), [ai-coding-agents](<https://devfeed.tech/tags/ai-coding-agents.md>), [ax](<https://devfeed.tech/tags/ax.md>), [benchmarks](<https://devfeed.tech/tags/benchmarks.md>), [context](<https://devfeed.tech/tags/context.md>), [reproducibility](<https://devfeed.tech/tags/reproducibility.md>)

## AI overview

This seventh article in Microsoft's Agent Experience series examines hidden environmental variables that can make the same AI coding-agent evaluation produce different results. It discusses context such as operating system, shell, diagnostics, build errors, file paths, and workspace details.

## Source excerpt

This is the seventh article in a series about Agent Experience (AX): the practice of making AI coding agents work correctly with your technology. The series covers what you can and can't control in the agent stack, how to measure whether your extensions are helping or hurting, and how to iterate toward better outcomes. You [...] The post The hidden variables in your agent eval appeared first on Microsoft for Developers.