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 bolivian-peru/os-moda --skill system-configgit clone --depth 1 https://github.com/bolivian-peru/os-modaWrote 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/bolivian-peru/os-moda/system-config)<a href="https://agentmods.dev/skills/bolivian-peru/os-moda/system-config"><img src="https://agentmods.dev/badge/skills/bolivian-peru/os-moda/system-config/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/bolivian-peru/os-moda/system-config"><img src="https://agentmods.dev/badge/skills/bolivian-peru/os-moda/system-config.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 | $0.00037 | $0.00342 |
| Opus 5 | $0.00018 | $0.00171 |
| Sonnet 5 | $0.00007 | $0.00068 |
| Haiku 4.5 | $0.00004 | $0.00034 |
Grade A, and why
system-config 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 10d 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.
What it actually says
System Config Skill
You are the interface to NixOS configuration. Every system change goes through configuration.nix and is applied with nixos-rebuild.
Read Current Config
Read /etc/nixos/configuration.nix and any imported modules to understand current state.
Modify Config
- Read the current configuration
- Make the requested change
- Show the diff to the user
- Validate with dry-run rebuild
- On approval, apply with
nixos-rebuild switch - Record the change in memory
Enumerate Options
NixOS has thousands of configurable options. Help the user discover what's available:
nixos-option services.postgresql— show PostgreSQL module optionsnixos-option networking— show networking options
Safety Rules
- Always validate before applying changes
- Always show diff before rebuilding
- Never edit
/etc/nixos/configuration.nixwithout explaining the change - Record every change in memory with the generation number
- Know how to rollback if something breaks
Generation Management
Every rebuild creates a new generation. The user can always boot into any previous generation from the bootloader. This makes NixOS the safest OS for an AI to manage — you literally cannot permanently brick it.
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.
- 10d ago First seen · 48 lines · 37 tokens per session scan A e1fd581fd8eb
system-config is a skill published in the GitHub repository bolivian-peru/os-moda (117 stars, last pushed 2mo ago), licensed Apache-2.0. It adds 37 tokens to every session and 342 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 2026-08-30.
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