Provide API to define location for instruction files

[DonJayamanne]

Current CLI supports specifying custom locations using the env variable COPILOT_CUSTOM_INSTRUCTIONS_DIRS
Having an API to do this would be great, similar to SessionConfig.skillDirectories

[github-actions]

Thanks for opening this issue, @DonJayamanne!

This is a reasonable enhancement request. Adding a customInstructionDirectories (or similar) property to SessionConfig would provide a programmatic alternative to the COPILOT_CUSTOM_INSTRUCTIONS_DIRS environment variable, consistent with how skillDirectories works.

I've labeled this as an enhancement. Since this would be an SDK-level feature that applies across all language implementations (Node.js, Python, Go, and .NET), the team will need to consider the API design for consistency across SDKs.

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