nixos_config: Agent for Claude Code

.claude/agents/issue-checker.md

issue-checker is an agent for Claude Code from olafkfreund/nixos_config. It costs 52 tokens per session (7,151 once invoked), scanned D, original, GPL-3.0.

A read-only checker for known NixOS and nixpkgs issues affecting packages in a project's dependency closure. NixOS is a Linux system built around declarative configuration, and nixpkgs is its package collection.

In plain words
What is it for?
It is for reviewing GitHub issues before updating Nix dependencies and assessing upgrade risk.
Why use it?
It can reveal known bugs and breaking problems before a flake update or other risky package change. It makes no changes.

Agent for Claude Code

Written for Claude Code: installed under .claude/. Also seen: model in frontmatter.

This is olafkfreund/nixos_config's own configuration. It tells Claude Code how to work on nixos_config itself, so it is not a mod to install elsewhere. Copy it as a starting point and replace the rules that are about this project. Everything nixos_config configures →

Reuse

Borrowing it

Nothing to install: this file belongs to olafkfreund/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.

Copy the file
curl -O https://raw.githubusercontent.com/olafkfreund/nixos_config/main/.claude/agents/issue-checker.md
Clone the repo
git clone --depth 1 https://github.com/olafkfreund/nixos_config

Made for: Claude Code.

Wrote 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.

agentmods badge for issue-checker

README.md
[![agentmods](https://agentmods.dev/badge/agents/olafkfreund/nixos_config/issue-checker.svg)](https://agentmods.dev/agents/olafkfreund/nixos_config/issue-checker)
Your own site
<a href="https://agentmods.dev/agents/olafkfreund/nixos_config/issue-checker"><img src="https://agentmods.dev/badge/agents/olafkfreund/nixos_config/issue-checker.svg" alt="Measured on agentmods" height="20"></a>
Per session 52 Only the description is in the session, so the agent can decide to use it. The body loads when it is invoked.
When invoked 7,151 The whole file, excluding the scripts and references it only reads on demand.
Security scan D 3 findings. A grade says what 26 rules found in the file — not that it is safe.
Origin unknown No closer match found in the catalogue.
Token cost

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.

ModelPer sessionOnce invoked
Fable 5.1 $0.00052 $0.07151
Opus 5 $0.00026 $0.03576
Sonnet 5 $0.00010 $0.01430
Haiku 4.5 $0.00005 $0.00715

Measured 6d ago against content hash 4ada8b2003f1, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-07, from the pricing page.

Security

Grade D, and why

issue-checker scanned grade D with 3 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 6d 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.

sudo nixos-rebuild "$@"

Recursive force deletehighDestructive command

rm -rf with a variable or a broad path is one typo away from removing the wrong tree.

rm -rf ~/.cache/nixos-issue-checker/

Makes network callslowCapability

Not a fault in itself. Listed so you know the mod talks to something, and to what.

curl # HTTP requests
.claude/agents/issue-checker.md · 1,082 lines

The source is not reproduced here

Licensed GPL-3.0

The repository is licensed GPL-3.0, which this catalogue does not treat as permission to reproduce the file. Read it at the source.

Read it on GitHub

Changes

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.

  1. 6d ago First seen · 1,082 lines · 52 tokens per session scan D 4ada8b2003f1

Subscribe to this mod's changes

issue-checker is an agent published in the GitHub repository olafkfreund/nixos_config (23 stars, last pushed today), licensed GPL-3.0. It adds 52 tokens to every session and 7,151 once invoked, about $0.0003 per session on Opus 5. A static security scan graded it D with 3 findings (asks for root, recursive force delete, makes network calls). No closer match exists in the catalogue, so it is treated as the original; first seen 2026-09-01.

Related

Other agents, from other repositories