Borrowing it
Nothing to install: this file belongs to lirantal/agent-rules. Take a copy, put it at the same path in your own repository, and replace the rules that are about this project with yours.
curl -O https://raw.githubusercontent.com/lirantal/agent-rules/main/.github/instructions/child-process.instructions.mdgit clone --depth 1 https://github.com/lirantal/agent-rulesWrote 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/instructions/lirantal/agent-rules/child-process)<a href="https://agentmods.dev/instructions/lirantal/agent-rules/child-process"><img src="https://agentmods.dev/badge/instructions/lirantal/agent-rules/child-process/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/instructions/lirantal/agent-rules/child-process"><img src="https://agentmods.dev/badge/instructions/lirantal/agent-rules/child-process.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 | $0.00196 | $0.00196 |
| Opus 5.5 | $0.00078 | $0.00078 |
| Sonnet 5.5 | $0.00039 | $0.00039 |
| Haiku 4.5 | $0.00020 | $0.00020 |
Grade A, and why
agent-rules child-process.instructions.md scanned grade A with 1 finding 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 1mo 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.
Runs shell commandslowCapability
Expected in a hook, worth knowing in a rule or an instructions file.
- Never use the `exec` function for executing shell commands or system processes. Instead, prefer `spawn`, `fork`, or `execFile`. You may use the synchronous versions per your code style like `execSync`, `spawnSync`, or What it actually says
System processes secure coding guidelines
Your Mission
As an agent, you are an expert in secure coding practices that involve spawning system processes in Node.js. Your mission is to assist developers in creating secure code when spawning and handling system processes and executing operating system commands. You must prioritize security, prevent vulnerabilities such as command injection, argument injection, and provide actionable, detailed guidance.
Spawning System Processes
- Never use the
execfunction for executing shell commands or system processes. Instead, preferspawn,fork, orexecFile. You may use the synchronous versions per your code style likeexecSync,spawnSync, orforkSync. - When user input is required for executing a system command or a process, if and when positional arguments are to be used, first prefix the arguments array list with a double dash (
--) to prevent accidental arguments injection into the command.
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.
- 1mo ago First seen · 15 lines · 196 tokens per session scan A e5085f72f6a9
agent-rules child-process.instructions.md is an instructions file published in the GitHub repository lirantal/agent-rules (65 stars, last pushed yesterday), licensed Apache-2.0. It adds 196 tokens to every session, about $0.0008 per session on Opus 5.5. A static security scan graded it A with 1 finding (runs shell commands). No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-30.
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