Getting it into your agent
One page per mod, every tool's command on it. A separate URL per tool would split the same page into five that compete with each other.
npx agentmods add skills/urmzd/dotfiles/setup-devenvnpx skills add urmzd/dotfiles --skill setup-devenvgit clone --depth 1 https://github.com/urmzd/dotfilesWrote this? Show the measurements
A badge with what this costs and how it scanned, read live from this page, so it follows the numbers instead of freezing them. Markdown for a README, HTML for a documentation site or a project page.
[](https://agentmods.dev/skills/urmzd/dotfiles/setup-devenv)<a href="https://agentmods.dev/skills/urmzd/dotfiles/setup-devenv"><img src="https://agentmods.dev/badge/skills/urmzd/dotfiles/setup-devenv.svg" alt="Measured on agentmods" height="20"></a>What it costs to keep this loaded
Counted locally with the o200k_base tokenizer, which is exact for GPT models; Claude uses its own tokenizer and its counts differ. Treat this as one consistent yardstick across the catalogue rather than a bill. Prices are per million input tokens.
| Model | Per session | Once invoked |
|---|---|---|
| Fable 5 | $0.00102 | $0.00856 |
| Opus 5 | $0.00051 | $0.00428 |
| Sonnet 5 | $0.00020 | $0.00171 |
| Haiku 4.5 | $0.00010 | $0.00086 |
Grade A, and why
setup-devenv scanned grade A with 0 findings against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured 3d ago.
A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.
Nothing flagged
None of the 26 patterns this scan looks for appear in this file: no shell pipes, no recursive deletes, no credential paths, no hidden text, no instruction-override or anti-refusal phrasing, no agent-config snooping. That is not a guarantee, it is the absence of the things that are checkable.
How it starts
The opening of the file, as written. The whole thing — 68 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Per-Language Dev Environments
Philosophy
System-installed CLIs (git, gh, fzf, jq, kubectl, terraform, ...) come from Homebrew on macOS or apt/dnf/pacman on Linux. Per-language runtime versions come from the best-in-class tool for that language. No polyglot abstraction layer.
Runtime version managers
| Language | Tool | Project pin | Notes |
|---|---|---|---|
| Node | fnm | .nvmrc |
eval "$(fnm env --use-on-cd)" in shell rc auto-switches |
| Python | uv | .python-version + pyproject.toml |
uv venv + uv sync |
| Rust | rustup | rust-toolchain.toml |
Auto-installs the pinned channel |
| Go | system go |
go.mod go directive |
One toolchain per machine usually fine |
| Lua | system lua |
n/a | Pin via Brewfile/apt |
.envrc patterns (vanilla direnv, no nix-direnv)
The standard direnv idioms cover most needs:
# Python: auto-create + activate .venv on cd
layout python
# Node with fnm: load .nvmrc-pinned version
use fnm
# Add project-local bin/ to PATH
PATH_add bin
# Load KEY=VALUE pairs from .env
dotenv
# Inherit ~/.envrc (which sources ~/.envrc.local for personal defaults)
source_up
For a working template, see the chezmoi-tracked ~/.local/share/chezmoi/dot_envrc.project.example (renders to ~/.envrc.project.example); see setup-devenv-with-chezmoi for the chezmoi plumbing. If you are not on chezmoi, copy the idioms above directly into your project .envrc.
When to add an upstream installer
Adopt a one-shot installer script (e.g. a chezmoi run_onchange_after_install-<tool>.sh.tmpl, a Brewfile entry, or a Nix derivation) with a pinned version when:
- The tool ships security/auth fixes faster than distro repos can package them (gcloud, aws-cli)
- The vendor distributes only via their own installer with no version-arg support (Snowflake Cortex)
- Reproducibility across machines matters more than the convenience of
brew upgrade
What this file has done since we first saw it
Hashed on every crawl. A supply-chain change to an agent config is a question of when, not whether, so the history is kept rather than the latest state alone.
- 3d ago First seen · 68 lines · 102 tokens per session scan A 5eeea1d035a8
setup-devenv is a skill published in the GitHub repository urmzd/dotfiles (3 stars, last pushed 21d ago), licensed Apache-2.0. It adds 102 tokens to every session and 856 once invoked, about $0.0005 per session on Opus 5. A static security scan graded it A with 0 findings. No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-31.
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