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nix-justfile

Conventions for writing justfile recipes in Nix-based projects.

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SKILL.md (original)

Review the instructions the agent will receive before you install.

Justfile in Nix projects

Doc comments

Every recipe must have a doc comment (# line above the recipe name).

Devshell detection

Use a nix_shell variable to auto-detect whether we're inside nix develop:

nix_shell := if env('IN_NIX_SHELL', '') != '' { '' } else { 'nix develop -c' }

Prefix commands that need devshell tools (node, trunk, cargo-watch, etc.) with {{nix_shell}}. Recipes that invoke nix directly (build, run, flake commands) don't need it.

Legibility

Long chained commands should use multiline \ continuations.

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