Tell Copilot not to allow breaking changes#13200
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YuliiaKovalova merged 1 commit intomainfrom Feb 5, 2026
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Pull request overview
This PR adds critical guidance to the Copilot instructions file to prevent breaking changes like the one that occurred in #13184, which required a revert after breaking VS Canary users. The addition emphasizes that MSBuild's critical role in the build ecosystem requires extreme caution with any changes that could break existing builds, particularly new errors or warnings.
Changes:
- Adds a new "Breaking Changes" section to
.github/copilot-instructions.mdexplaining the policy against adding new errors or warnings to existing behavior - Clarifies that warnings are breaking changes because many production builds use
/WarnAsError - Provides an exception for new, opt-in behavior where warnings and errors can be added more freely
JanProvaznik
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Feb 25, 2026
Defense in depth for problems like the one that led to dotnet#13184 which led to broken VS Canary users.
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Defense in depth for problems like the one that led to #13184 which led to broken VS Canary users.