Borrowing it
Nothing to install: this file belongs to FilipNowakowicz/nixos-config. 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/FilipNowakowicz/nixos-config/main/CLAUDE.mdgit clone --depth 1 https://github.com/FilipNowakowicz/nixos-configWrote 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/filipnowakowicz/nixos-config/claude-md)<a href="https://agentmods.dev/instructions/filipnowakowicz/nixos-config/claude-md"><img src="https://agentmods.dev/badge/instructions/filipnowakowicz/nixos-config/claude-md/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/filipnowakowicz/nixos-config/claude-md"><img src="https://agentmods.dev/badge/instructions/filipnowakowicz/nixos-config/claude-md.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 | $0.03140 | $0.03140 |
| Opus 5 | $0.01570 | $0.01570 |
| Sonnet 5 | $0.00628 | $0.00628 |
| Haiku 4.5 | $0.00314 | $0.00314 |
Grade B, and why
nixos-config CLAUDE.md scanned grade B 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 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.
Asks for rootmediumPrivilege escalation
A mod that escalates privileges can change anything on the machine, not only the project.
Module topology, persistence model, and the agent-maintenance sudo allowlist How it starts
The opening of the file, as written. The whole thing — 202 lines — stays where its author put it; the contents beside it link to each section on GitHub.
NixOS Flake Configuration
Personal NixOS flake for an endgame, reproducible setup. Prefer clean, idiomatic Nix over quick fixes. Suggest better approaches proactively. Explain why, not just what.
For repository overview and structure see README.md.
For deeper context see docs/architecture.md,
docs/operations.md, and
docs/security.md. Host-local runbooks live
under each host: hosts/main/CLAUDE.md,
hosts/mac/CLAUDE.md,
hosts/homeserver-gcp/CLAUDE.md,
hosts/gcp-builder/CLAUDE.md,
hosts/gcp-agent/CLAUDE.md.
Environment
- Dev machine: NixOS (
main). - Dev shell:
nix develop— providesdeploy-rs,nixos-anywhere,nixd,statix,deadnix,sops,ssh-to-age,vulnix,direnv, and the flake-managed pre-commit hook tooling. - Per-project shells:
direnvenabled — useuse flakein.envrc. - Git hooks:
nix developinstalls acommit-msghook that stripsCo-authored-by:trailers to keep history single-author. - Fresh
/tmp/nix-*linked worktrees: acodex/*branch may already be checked out in another worktree (git worktree list), and.pre-commit-config.yamlis flake-generated so a worktree never entered vianix developlacks it — commit there with--no-verify, but never use--no-verifyto skip a real lint failure in the primary checkout. - Git is for version control only, not deployment.
Deploy Commands
main:nh os switch --hostname main .(alias:rebuild).mac:deploy '.#mac'frommain; local fallbacknh os switch --hostname mac ..homeserver-gcp:deploy '.#homeserver-gcp'for ongoing updates.scripts/deploy-gcp.shis provisioning/reinstall only (Terraform apply +nixos-anywhere), not an ongoing-deploy alias. Notedeploy-rscan appear silent/hung in non-interactive sessions; fall back to a manual closure deploy (nix buildthe system,nix copythe closure, thenswitch-to-configuration).gcp-builder:deploy '.#gcp-builder'for ongoing updates (start the VM first; it is normally powered off). Provision once viahosts/gcp-builder/CLAUDE.md. It is an on-demand Nix remote builder, not a service host —mainstarts it transparently for heavy builds (seescripts/validate.sh) and it self-powers-off when idle.gcp-agent: on-demand Claude Code agent host (issue-loop sessions, not a service host). Keeps narrow sudo, so there is no deploy-rs auto-activation — apply config changes by reprovisioning or manual activation. Provision once viahosts/gcp-agent/CLAUDE.md.user@wsl:home-manager switch --flake .#user@wsl.
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 · 202 lines · 3,140 tokens per session scan B 19342fe5b319
nixos-config CLAUDE.md is an instructions file published in the GitHub repository FilipNowakowicz/nixos-config (5 stars, last pushed 4d ago), licensed MIT. It adds 3,140 tokens to every session, about $0.0157 per session on Opus 5. A static security scan graded it B with 1 finding (asks for root). No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-31.
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