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/berkcangumusisik/claude-code-practices/env-setupnpx skills add berkcangumusisik/claude-code-practices --skill env-setupgit clone --depth 1 https://github.com/berkcangumusisik/claude-code-practicesWrote 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/berkcangumusisik/claude-code-practices/env-setup)<a href="https://agentmods.dev/skills/berkcangumusisik/claude-code-practices/env-setup"><img src="https://agentmods.dev/badge/skills/berkcangumusisik/claude-code-practices/env-setup.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 | $0.00018 | $0.00307 |
| Opus 5 | $0.00009 | $0.00153 |
| Sonnet 5 | $0.00004 | $0.00061 |
| Haiku 4.5 | $0.00002 | $0.00031 |
Grade A, and why
env-setup 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 4d 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.
What it actually says
Environment Setup
- Find all env var usages:
grep -rn "process\.env\.\|Deno\.env\.get\|env\." src/ --include="*.ts" --include="*.js" | grep -oE "process\.env\.[A-Z_]+" | sort -u
- Check existing
.env*files:
ls .env* 2>/dev/null
cat .env.example 2>/dev/null
-
For each env var found:
- What is it used for?
- Is it required or optional?
- What's a safe example value?
- Any format constraints? (URL, UUID, comma-separated, etc.)
-
Generate/update
.env.example:
# Database
DATABASE_URL=postgresql://user:password@localhost:5432/mydb
# Auth
JWT_SECRET=your-secret-key-min-32-chars
JWT_EXPIRES_IN=7d
# External APIs (optional)
STRIPE_SECRET_KEY=sk_test_...
- Generate a startup validation script
src/lib/env.tsusingzodorenvalidto fail fast if required vars are missing.
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.
- 4d ago First seen · 42 lines · 18 tokens per session scan A 47ffa53ca423
env-setup is a skill published in the GitHub repository berkcangumusisik/claude-code-practices (10 stars, last pushed 4mo ago), licensed MIT. It adds 18 tokens to every session and 307 once invoked, about $0.0001 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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