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Copilot custom instructions: writing .github/copilot-instructions.md that actually gets followed

This story is from 2026-09-17. It is preserved in the archive; the latest stories are on the live feed.

Of the three major coding agents, GitHub Copilot has the most constrained instruction surface: one file ( .github/copilot-instructions.md ), loaded into workspace context, with the least room of the three. That constraint is not a limitation to work around, it is the design brief. Here is what the…

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  1. 2026-09-17 10:23 · DEV Community — AI
    Copilot custom instructions: writing .github/copilot-instructions.md that actually gets followed

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