A pre-commit quality checklist for formatting, linting, type checks, security scans, and other static checks.

Use it before committing Python changes to run the project's formatting, analysis, and verification commands.

It catches common code-quality problems before changes are committed and reports failures with their exact errors.

check-env — Skill for Claude Code by jrmatherly

Install

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.

Any agent

npx skills add jrmatherly/mcp-context-forge --skill check-env

Clone the repo

git clone --depth 1 https://github.com/jrmatherly/mcp-context-forge

Made for: Claude Code.

Wrote 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.

README.md

[![agentmods](https://agentmods.dev/badge/skills/jrmatherly/mcp-context-forge/check-env/github.svg)](https://agentmods.dev/skills/jrmatherly/mcp-context-forge/check-env)

Your own site

<a href="https://agentmods.dev/skills/jrmatherly/mcp-context-forge/check-env"><img src="https://agentmods.dev/badge/skills/jrmatherly/mcp-context-forge/check-env/github.svg" alt="Measured on agentmods" height="20"></a>

Or the 80×15 button, for a site that already has a row of RSS and ATOM ones. Only the verdict fits; the numbers stay here.

Your own site · 80×15

<a href="https://agentmods.dev/skills/jrmatherly/mcp-context-forge/check-env"><img src="https://agentmods.dev/badge/skills/jrmatherly/mcp-context-forge/check-env.svg" alt="Reviewed on agentmods" width="80" height="20"></a>

Per session 24 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.

When invoked 247 The whole file, excluding the scripts and references it only reads on demand.

Security scan A 0 findings. A grade says what 26 rules found in the file — not that it is safe.

Origin original No closer match found in the catalogue.

Token cost

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 5.1	$0.00024	$0.00247
Opus 5	$0.00012	$0.00123
Sonnet 5	$0.00005	$0.00049
Haiku 4.5	$0.00002	$0.00025

Measured 6d ago against content hash f19f444c2b60, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-09, from the pricing page.

Security

Grade A, and why

check-env 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 6d 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.

.claude/skills/check-env/SKILL.md · 35 lines

What it actually says

Run the project's full quality pipeline before committing.

Current State

Branch: !git branch --show-current
Unstaged changes: !git diff --stat

Steps

Format and run pre-commit hooks:
```
make autoflake isort black pre-commit
```

Type-check new/modified Python files only (use ty or mypy):

# Check just the files that changed
git diff --name-only --diff-filter=ACMR HEAD -- '*.py' | xargs -I{} .venv/bin/mypy {} --ignore-missing-imports 2>/dev/null || true

Run static analysis:

make flake8 bandit interrogate pylint verify

Report any failures. For each failure:
- Show the exact error
- Fix it if straightforward
- Ask the user if the fix is unclear

Changes

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.

6d ago First seen · 35 lines · 24 tokens per session scan A f19f444c2b60

Subscribe to this mod's changes

check-env is a skill published in the GitHub repository jrmatherly/mcp-context-forge (0 stars, last pushed 6mo ago), licensed Apache-2.0. It adds 24 tokens to every session and 247 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 2026-09-03.

Security Testing

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check-env