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 agentmods add instructions/arcanyx-org/nixium/agents-mdgit clone --depth 1 https://github.com/Arcanyx-org/NiXiumWrote 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/arcanyx-org/nixium/agents-md)<a href="https://agentmods.dev/instructions/arcanyx-org/nixium/agents-md"><img src="https://agentmods.dev/badge/instructions/arcanyx-org/nixium/agents-md.svg" alt="Measured on agentmods" 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 | $0.10927 | $0.10927 |
| Opus 5 | $0.05463 | $0.05463 |
| Sonnet 5 | $0.02185 | $0.02185 |
| Haiku 4.5 | $0.01093 | $0.01093 |
Grade B, and why
NiXium AGENTS.md scanned grade B 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 5d 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.
Asks for rootmediumPrivilege escalation
A mod that escalates privileges can change anything on the machine, not only the project.
The `kira` user in `src/nixos/users/users/kira/kira.nix` had `"wheel"` in `extraGroups` granting sudo access. Remove `"wheel"` from the list to revoke admin privileges while keeping other groups (docker, dialout). Makes network callslowCapability
Not a fault in itself. Listed so you know the mod talks to something, and to what.
runtimeInputs = [ pkgs.curl ]; The source is not reproduced here
Licensed EUPL-1.2
The repository is licensed EUPL-1.2, which this catalogue does not treat as permission to reproduce the file. Read it at the source.
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.
- 5d ago First seen · 942 lines · 10,927 tokens per session scan B 4ef4028dc554
NiXium AGENTS.md is an instructions file published in the GitHub repository Arcanyx-org/NiXium (48 stars, last pushed 1mo ago), licensed EUPL-1.2. It adds 10,927 tokens to every session, about $0.0546 per session on Opus 5. A static security scan graded it B with 2 findings (asks for root, makes network calls). No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-30.
Other instructions, from other repositories
nix-config AGENTS.md
AGENTS.md instructions for dliberalesso/nix-config, covering agent instructions for nix-config, build/lint/test commands, architecture guidance, architecture and common patterns.
nixos-config GEMINI.md
Instructions for FilipNowakowicz/nixos-config, covering gemini cli agent instructions, your role, what you must not do, what you can do and repository context.
CV-nixCfg AGENTS.md
Instructions for DivitMittal/CV-nixCfg, covering project summary, what this repo is, dev environment, or with direnv: direnv allow and build.
nixos-config CLAUDE.md
Instructions for FilipNowakowicz/nixos-config, covering nixos flake configuration, environment, deploy commands, validation shortcuts and ci.
nix-lifestyle AGENTS.md
AGENTS.md instructions for NelsonJeppesen/nix-lifestyle, covering agents.md – nix lifestyle repo guidance, layout (only what's non-obvious), build, conventions (deviations from generic nix style) and format before commit.
ihp CLAUDE.md
Claude Code instructions for digitallyinduced/ihp, covering claude.md, development environment setup, running tests, interactive (allows :r to reload after changes) and one-liner.