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 skills add heyAyushh/stacc --skill agent-friendly-cligit clone --depth 1 https://github.com/heyAyushh/staccWrote 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/heyayushh/stacc/agent-friendly-cli)<a href="https://agentmods.dev/skills/heyayushh/stacc/agent-friendly-cli"><img src="https://agentmods.dev/badge/skills/heyayushh/stacc/agent-friendly-cli/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.
<a href="https://agentmods.dev/skills/heyayushh/stacc/agent-friendly-cli"><img src="https://agentmods.dev/badge/skills/heyayushh/stacc/agent-friendly-cli.svg" alt="Reviewed on agentmods" width="80" 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 5.1 | $0.00046 | $0.01301 |
| Opus 5 | $0.00023 | $0.00651 |
| Sonnet 5 | $0.00009 | $0.00260 |
| Haiku 4.5 | $0.00005 | $0.00130 |
Grade A, and why
rust-agent-friendly-cli 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 9d 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 — 171 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Agent-Friendly CLI
Layer 2: Interface Design
Core Question
Can another agent run this command correctly without an interactive back-and-forth?
Before adding or changing a CLI:
- Are all required decisions available as flags or stdin?
- Does
--helpshow the exact working examples? - Do failures tell the caller how to retry?
Thinking Prompt
-
What is the automation contract?
- Inputs: path, stdin, config file, environment, or all of them
- Outputs: human text, JSON, files, or exit status
- Side effects: read-only, write, network, or destructive
-
Can it run unattended?
- No prompts on the default path
- Every prompt has an explicit flag alternative
- Destructive commands have
--dry-runplus--yesor--force
-
Can failures be fixed from the message?
- Explain what was wrong
- Name the expected input shape
- Include one or two exact retry commands
CLI Contract Checklist
| Area | Requirement |
|---|---|
| Input | Accept paths and stdin (--stdin or --input -) when useful |
| Identity | Preserve virtual source names with flags like --stdin-path |
| Output | Offer structured output such as --json for automation |
| Help | Put real examples in top-level and subcommand help |
| Errors | Return usage errors before doing work |
| Safety | Require --dry-run and explicit confirmation for writes |
| Exit codes | Keep stable meanings and document them |
Rust Implementation Patterns
| Need | Rust Pattern |
|---|---|
| Command parsing | clap::Parser or clap::CommandFactory |
| Example-rich help | after_help / after_long_help constants |
| Usage validation | Dedicated validation function before execution |
| Stdin support | Read std::io::stdin() once at the command boundary |
| Structured output | Serialize response types with serde |
| Actionable errors | Small error type with Display examples |
| Testing | assert_cmd, snapshot tests, or parser unit tests |
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.
- 9d ago First seen · 171 lines · 46 tokens per session scan A 21fc9b431063
rust-agent-friendly-cli is a skill published in the GitHub repository heyAyushh/stacc (3 stars, last pushed 2mo ago), licensed MIT. It adds 46 tokens to every session and 1,301 once invoked, about $0.0002 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.
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