dev.implement-cli-args-parsing

dev.implement-cli-args-parsing is a command for GitHub Copilot from stefaniuk/loadout. It costs 12 tokens per session (2,390 once invoked), scanned A, original, MIT.

A codebase audit command for checking how command-line programs read and validate their arguments. A command-line program is run from a terminal and receives options or values typed by the user.

In plain words
What is it for?
Use it to locate CLI entry points and argument parsers in a selected programming language, then report and fix rule violations where possible.
Why use it?
It finds fragile manual parsing and inconsistent validation that can cause confusing errors or unsafe defaults.

Command for GitHub Copilot

Written for GitHub Copilot: a Copilot chat mode or prompt.

Good fit Use it to locate CLI entry points and argument parsers in a selected programming language, then report and fix rule violations where possible.

Compare 6 commands from other repositories ↓
Install with agentmods
npx agentmods add commands/stefaniuk/loadout/dev.implement-cli-args-parsing
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.

Clone the repo
git clone --depth 1 https://github.com/stefaniuk/loadout

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 dev.implement-cli-args-parsing

README.md
[![agentmods](https://agentmods.dev/badge/commands/stefaniuk/loadout/dev.implement-cli-args-parsing/github.svg)](https://agentmods.dev/commands/stefaniuk/loadout/dev.implement-cli-args-parsing)
Your own site
<a href="https://agentmods.dev/commands/stefaniuk/loadout/dev.implement-cli-args-parsing"><img src="https://agentmods.dev/badge/commands/stefaniuk/loadout/dev.implement-cli-args-parsing/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 dev.implement-cli-args-parsing

Your own site · 80×15
<a href="https://agentmods.dev/commands/stefaniuk/loadout/dev.implement-cli-args-parsing"><img src="https://agentmods.dev/badge/commands/stefaniuk/loadout/dev.implement-cli-args-parsing.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 12 Only the description is in the session, so the agent can decide to use it. The body loads when it is invoked.
When invoked 2,390 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.

ModelPer sessionOnce invoked
Fable 5.1 $0.00012 $0.02390
Opus 5.5 $0.00005 $0.00956
Sonnet 5 $0.00002 $0.00478
Haiku 4.5 $0.00001 $0.00239

Measured 16d ago against content hash 12298164d8ff, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-28, from the pricing page.

Security

Grade A, and why

dev.implement-cli-args-parsing 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 16d 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.

.github/prompts/dev.implement-cli-args-parsing.prompt.md · 193 lines

How it starts

The opening of the file, as written. The whole thing — 193 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Input argument: Language (for example Python, TypeScript, Go, Rust).

Goal 🎯

Review every CLI entrypoint and argument parser against the CLI standards below. Report compliance with evidence and fix gaps using the defaults in this prompt and the baseline.

Steps 👣

Step 1: Discover CLI entrypoints

  1. Use the provided Language input to drive file discovery.
  2. Run git ls-files '*.<ext>' to enumerate tracked files for the detected language (for example .py, .ts, .tsx, .go, .rs).
  3. Locate CLI entrypoints in each language and runtime, including:
    • Conventional entry files (for example __main__, main, cli, bin/, scripts/).
    • Package metadata that registers commands (for example pyproject.toml, setup.cfg, setup.py, package.json, Cargo.toml).
  4. Record the entrypoint function or module for each CLI.

Step 2: Identify argument parsing logic

  1. For each CLI, find the argument parsing library (for example flag, cobra, urfave/cli, argparse, click, typer, clap, picocli, commander, yargs).
  2. Flag manual parsing (sys.argv, os.Args, process.argv) or ad-hoc split logic that bypasses a parser.
  3. Record where validation and default handling occur.

Step 3: Assess CLI contract baseline compliance

Use it for context and evaluate each CLI against the CLI Contract Baseline:

Step 4: Remediate

  1. Apply fixes immediately using the defaults in this prompt and the baseline.
  2. Keep changes small and consistent with existing patterns.
  3. Where behaviour changes are introduced, add tests using a strict Red → Green → Refactor flow.

Implementation requirements 🛠️

Anti-patterns (flag and fix immediately) 🚫

  • Manual argv parsing that bypasses a dedicated parser.
  • Abbreviated long flags or prefix matching that can become ambiguous.
  • More than two positional arguments without clear documentation and validation.
  • Boolean values represented as positional arguments.
  • Unknown flags or surplus positional arguments ignored or silently dropped.
  • Flag names that are inconsistent across commands for the same concept.
  • Help output that omits defaults, environment variable sources, or usage examples.
  • Hidden side effects on flag parsing or validation that make flags non-idempotent.
  • Interactive prompts triggered by default without a non-interactive equivalent.
  • Diagnostics printed to stdout or mixed into machine-readable outputs.
  • Wrapper CLIs that re-implement business logic instead of delegating to shared libraries.

Read the full file on GitHub · 193 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. 16d ago First seen · 193 lines · 12 tokens per session scan A 12298164d8ff

Subscribe to this mod's changes

dev.implement-cli-args-parsing is a command published in the GitHub repository stefaniuk/loadout (1 stars, last pushed today), licensed MIT. It adds 12 tokens to every session and 2,390 once invoked, about $0.0000 per session on Opus 5.5. 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 2026-09-12.

Related

Other commands, from other repositories