easy-cheese: Instructions file for GitHub Copilot

.github/instructions/shell.instructions.md

easy-cheese shell.instructions.md is an instructions file for GitHub Copilot from paulnsorensen/easy-cheese. It costs 628 tokens per session, scanned C, original, MIT.

A checklist for reviewing Bash shell scripts and their tests. Bats is a testing tool for Bash programs, and ShellCheck is a tool that finds common shell-script problems.

In plain words
What is it for?
It helps review install scripts and Bats tests for error handling, quoting, safe commands, external dependency checks, and maintainable structure.
Why use it?
It focuses reviews on security and behavior issues—such as unsafe input handling, missing checks, and network calls without timeouts—rather than minor formatting.

Instructions file for GitHub Copilot

Written for GitHub Copilot: a Copilot instructions file.

This is paulnsorensen/easy-cheese's own configuration. It tells GitHub Copilot how to work on easy-cheese itself, so it is not a mod to install elsewhere. Copy it as a starting point and replace the rules that are about this project. Everything easy-cheese configures →

Reuse

Borrowing it

Nothing to install: this file belongs to paulnsorensen/easy-cheese. Take a copy, put it at the same path in your own repository, and replace the rules that are about this project with yours.

Copy the file
curl -O https://raw.githubusercontent.com/paulnsorensen/easy-cheese/dist/.github/instructions/shell.instructions.md
Clone the repo
git clone --depth 1 https://github.com/paulnsorensen/easy-cheese

Made for: GitHub Copilot.

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.

agentmods badge for easy-cheese shell.instructions.md

README.md
[![agentmods](https://agentmods.dev/badge/instructions/paulnsorensen/easy-cheese/shell/github.svg)](https://agentmods.dev/instructions/paulnsorensen/easy-cheese/shell)
Your own site
<a href="https://agentmods.dev/instructions/paulnsorensen/easy-cheese/shell"><img src="https://agentmods.dev/badge/instructions/paulnsorensen/easy-cheese/shell/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.

agentmods 80×15 button for easy-cheese shell.instructions.md

Your own site · 80×15
<a href="https://agentmods.dev/instructions/paulnsorensen/easy-cheese/shell"><img src="https://agentmods.dev/badge/instructions/paulnsorensen/easy-cheese/shell.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 628 This file is loaded in full into every session.
When invoked 628 The same file — it is already loaded in full.
Security scan C 2 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.

ModelPer sessionOnce invoked
Fable 5.1 $0.00628 $0.00628
Opus 5.5 $0.00251 $0.00251
Sonnet 5.5 $0.00126 $0.00126
Haiku 4.5 $0.00063 $0.00063

Measured 2d ago against content hash 375ba97071e7, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade C, and why

easy-cheese shell.instructions.md scanned grade C with 2 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 2d 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.

Recursive force deletehighDestructive command

rm -rf with a variable or a broad path is one typo away from removing the wrong tree.

- `rm -rf "$var"` without guarding against empty `$var`. Use

Makes network callslowCapability

Not a fault in itself. Listed so you know the mod talks to something, and to what.

- New external commands (`curl`, `jq`, `bats`, `brew`, etc.) need a preflight
.github/instructions/shell.instructions.md · 56 lines

How it starts

The opening of the file, as written. The whole thing — 56 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Shell review checklist (shell scripts and bats tests)

The repo ships no install script. Shell scripts and bats tests, such as tests/fanout/bash/, still follow these rules. Focus review on behavior, not lint nits.

Hard rules

  • set -euo pipefail at the top of any new shell script. Missing it is a blocker, not a nit.
  • Quote every expansion: "$var", "${arr[@]}". Unquoted $var in a filename or path is a security finding, not a style one.
  • [[ ... ]] over [ ... ]. Bash-only repo, no POSIX-sh constraint.
  • Use printf for any output that contains user-supplied data or escape sequences. Reserve echo for literal static strings.
  • New external commands (curl, jq, bats, brew, etc.) need a preflight check with a clear error message — don't let the script die three lines later on command not found.

What to flag

  • Functions over ~30 lines or scripts over ~500 lines without decomposition.
  • Network calls without timeout flags (curl --max-time, --connect-timeout).
  • eval or bash -c "$var" — almost always avoidable, almost always a vulnerability when $var touches user input.
  • rm -rf "$var" without guarding against empty $var. Use rm -rf -- "${var:?}" or check first.
  • Silent failures — every failed step should print what failed and exit non-zero.
  • bats tests that exercise the happy path only. Each new flag or branch should have a failure-mode test.

What not to flag

  • Anything ShellCheck already catches (SC2086, SC2046, etc.) — CI runs it.
  • local placement, alignment, double-vs-single quote on static strings.
  • Cheese / Dune / Mad Max / LOTR / Princess Bride flavor in user-facing echo lines. Intentional repo voice.
  • Bashism vs POSIX-sh portability — this is a Bash repo.

bats specifics

  • Each @test does one thing. Name the test after the behavior, not the function: @test "install fails fast when curl missing", not @test "test_check_deps".
  • Use run for the command under test, then assert on $status and $output — don't assert before run returns.
  • Stub external commands (curl, brew, claude, gh) via PATH injection or helper wrappers. A bats test that actually hits the network or shells out to real brew is a flake waiting to happen.
  • Keep bats tests offline. Do not add tests that call the network or a real package manager.

Read the full file on GitHub · 56 lines

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.

  1. 2d ago Changed · -3 lines · -87 tokens per session 375ba97071e7
  2. 1mo ago First seen · 59 lines · 715 tokens per session scan C afde43176a4d

Subscribe to this mod's changes

easy-cheese shell.instructions.md is an instructions file published in the GitHub repository paulnsorensen/easy-cheese (18 stars, last pushed today), licensed MIT. It adds 628 tokens to every session, about $0.0025 per session on Opus 5.5. A static security scan graded it C with 2 findings (recursive force delete, makes network calls). No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-30.

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