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Use when initializing a new project with devenv, direnv, and jj version control. Triggers on: setting up dev environment, configuring nix shell, project bootstrap.
Codex または Claude でインストール この Prompt をコピーして Codex、Claude、または他のアシスタントに貼り付けると、Skill ページを確認してインストールできます。
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| name | devenv-init |
| description | Use when initializing a new project with devenv, direnv, and jj version control. Triggers on: setting up dev environment, configuring nix shell, project bootstrap. |
Bootstrap a development environment with jj (git-backed), devenv (nix-based tools), and direnv (auto-activation). Idempotent - safe to run multiple times to update configuration.
bash .claude/skills/devenv-init/setup-devenv.sh # Full setup
bash .claude/skills/devenv-init/setup-devenv.sh --force # Regenerate devenv.nix
bash .claude/skills/devenv-init/setup-devenv.sh --analyze # Analyze only
| Detected | Source | Generated Config |
|---|---|---|
| Rust | Cargo.toml | languages.rust, cargo-watch, rustfmt/clippy hooks |
| Python | pyproject.toml | languages.python, ruff, uv, pytest |
| Node | package.json | languages.javascript, pnpm/yarn, scripts from package.json |
| Go | go.mod | languages.go, golangci-lint, gofmt hook |
| Tools | Makefile, justfile | packages (gnumake, just) |
| File | Behavior on Re-run |
|---|---|
| .envrc | Updates if managed, backs up if not |
| devenv.nix | Skips unless --force, backs up if unmanaged |
| devenv.yaml | Skips if exists |
| .jj | Initializes only if missing |
Files managed by this skill contain a marker comment. Unmanaged files are backed up before overwriting.
--force, -f Regenerate devenv.nix even if already managed
--analyze, -a Only analyze repo, show recommendations, don't write
--help, -h Show help
| Section | Auto-populated From |
|---|---|
| packages | Detected tools (cargo-watch, ruff, pnpm, etc) |
| scripts | Common dev commands (check, lint, test, dev) |
| tasks | Build/test commands for devenv tasks run |
| processes | Dev servers from package.json scripts |
| pre-commit.hooks | Language-appropriate formatters/linters |
The generated .envrc gracefully handles:
use_nixUse devenv-query.sh to explore available options without loading full docs:
# List all available languages
bash .claude/skills/devenv-init/devenv-query.sh langs
# List all available services
bash .claude/skills/devenv-init/devenv-query.sh services
# Search options for a specific feature
bash .claude/skills/devenv-init/devenv-query.sh options languages.rust
bash .claude/skills/devenv-init/devenv-query.sh options services.postgres
# Search nixpkgs for packages
bash .claude/skills/devenv-init/devenv-query.sh packages ripgrep
# Evaluate current devenv.nix config (returns JSON)
bash .claude/skills/devenv-init/devenv-query.sh eval languages.rust.enable
Results are cached for 24h in ~/.cache/devenv-init/.
| Issue | Fix |
|---|---|
| "No git or jj repository" | Run git init first |
| "Not git-backed" | Run jj git init --colocate |
| Want to regenerate | Run with --force |
| Wrong detection | Edit devenv.nix manually, it won't be overwritten |
| Need option details | Run devenv-query.sh options <path> |