agentmods.dev

fedora-dns-cache

fedora-dns-cache is a skill for Claude Code, Codex from rhtevan/agentfs. It costs 22 tokens per session (890 once invoked), scanned B, original, Apache-2.0.

A Fedora and systemd-resolved configuration for using expired DNS answers when upstream DNS servers cannot be reached. DNS is the system that turns names such as example.com into network addresses.

In plain words
What is it for?
Use it on Fedora 40 or newer to configure stale DNS-cache retention and diagnose DNS timeout problems. It requires systemd-resolved and permission to change its system configuration.
Why use it?
It prevents terminal and shell commands from waiting through long DNS timeouts during network or DNS outages. Previously cached names can still work for a limited period.

Skill for Claude CodeCodex

not rated 2 today B scan 22 tokens original Apache-2.0
View the source file rhtevan/agentfs rhtevan.github.io
Install

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.

agentmods
npx agentmods add skills/rhtevan/agentfs/fedora-dns-cache
Any agent
npx skills add rhtevan/agentfs --skill fedora-dns-cache
Clone the repo
git clone --depth 1 https://github.com/rhtevan/agentfs

Made for: Claude Code, Codex.

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 fedora-dns-cache

README.md
[![agentmods](https://agentmods.dev/badge/skills/rhtevan/agentfs/fedora-dns-cache.svg)](https://agentmods.dev/skills/rhtevan/agentfs/fedora-dns-cache)
Your own site
<a href="https://agentmods.dev/skills/rhtevan/agentfs/fedora-dns-cache"><img src="https://agentmods.dev/badge/skills/rhtevan/agentfs/fedora-dns-cache.svg" alt="Measured on agentmods" height="20"></a>
Per session 22 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 890 The whole file, excluding the scripts and references it only reads on demand.
Security scan B 1 finding. Scan, not verified.
Origin original 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 $0.00022 $0.00890
Opus 5 $0.00011 $0.00445
Sonnet 5 $0.00004 $0.00178
Haiku 4.5 $0.00002 $0.00089

Measured 5d ago against content hash a0c4dee1c2d3, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-05, from the pricing page.

Security

Grade B, and why

fedora-dns-cache 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 5d ago.

The scan reads SKILL.md. This mod also ships 1 executable file (scripts/setup.sh), listed below but not scanned — reading those needs a real analyzer, not pattern matching.

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 mkdir -p /etc/systemd/resolved.conf.d
skills/fedora-dns-cache/SKILL.md · 123 lines

How it starts

The opening of the file, as written. The whole thing — 123 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Fedora DNS Cache for Offline Resilience

Configure systemd-resolved to serve stale (expired) DNS cache entries when upstream DNS servers are unreachable, preventing 30+ second hangs in terminals and shells caused by DNS resolution timeouts.

Problem

When an ISP connection drops or DNS servers become unreachable, every DNS lookup (hostname resolution, SSSD/IPA checks, etc.) blocks for 30+ seconds waiting for a timeout. This makes GNOME Terminal appear stuck — the window opens but no prompt appears until all pending DNS queries time out.

Solution

Enable StaleRetentionSec in systemd-resolved. When upstream DNS is unreachable, previously cached answers are served immediately (for up to 1 hour after expiry) instead of waiting for a timeout.

Prerequisites

  • Fedora 40+ (or any systemd 250+ distro with systemd-resolved)
  • systemd-resolved active as the system DNS resolver
  • sudo access to write to /etc/systemd/resolved.conf.d/

Steps

  1. Diagnose DNS timeout history

    Check if DNS timeouts have been occurring:

    resolvectl statistics | grep -A1 Timeout

    Any non-zero "Total Timeouts" confirms the problem.

  2. Check current configuration

    Verify no existing stale cache config:

    systemd-analyze cat-config systemd/resolved.conf | grep -i stale

    Default is #StaleRetentionSec=0 (disabled).

  3. Apply the drop-in configuration

    Run the setup script (requires sudo):

    bash ~/.agents/skills/fedora-dns-cache/scripts/setup.sh

    Or apply manually:

    sudo mkdir -p /etc/systemd/resolved.conf.d

sudo tee /etc/systemd/resolved.conf.d/fast-timeout.conf <<'EOF'
# Reduce DNS pain when ISP connection drops
[Resolve]
# Serve stale (expired) cached records when upstream DNS is unreachable
# rather than waiting for a timeout. Stale records served for up to 1 hour.
StaleRetentionSec=3600
EOF

  4. Restart systemd-resolved

    sudo systemctl restart systemd-resolved

Read the full file on GitHub · 123 lines

Files

What ships with it

2 files beside SKILL.md in the same directory: the scripts, references and assets a skill reads on demand. Not counted in the per-session cost; read them before you install if any of them is executable.

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. 5d ago First seen · 123 lines · 22 tokens per session scan B a0c4dee1c2d3

Subscribe to this mod's changes

fedora-dns-cache is a skill published in the GitHub repository rhtevan/agentfs (2 stars, last pushed today), licensed Apache-2.0. It adds 22 tokens to every session and 890 once invoked, about $0.0001 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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