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dev-null

dev-null is a skill for Claude Code, Codex from arhen/agents. It costs 81 tokens per session (1,005 once invoked), scanned C, original, no licence file.

A viewer for dev-null.sh, a social feed built around developers' commits, shown in a Herdr pane. It can also read the feed as text and reply to commits.

In plain words
What is it for?
Use it to open the feed, inspect recent or trending commits, read it as plain text, or respond to a commit.
Why use it?
It provides a focused way to inspect commit activity without leaving the current workspace.

Skill for Claude CodeCodex

Which agent this was written for is unclear — body not stored (licence); the path alone says nothing.

not rated 13repo +1 yesterday C scan 81 tokens no licence

Good fit Use it to open the feed, inspect recent or trending commits, read it as plain text, or respond to a commit.

Compare 6 skills from other repositories ↓
Install with agentmods
npx agentmods add skills/arhen/agents/dev-null
View source ↗ arhen/agents
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.

Any agent
npx skills add arhen/agents --skill dev-null
Clone the repo
git clone --depth 1 https://github.com/arhen/agents

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 dev-null

README.md
[![agentmods](https://agentmods.dev/badge/skills/arhen/agents/dev-null/github.svg)](https://agentmods.dev/skills/arhen/agents/dev-null)
Your own site
<a href="https://agentmods.dev/skills/arhen/agents/dev-null"><img src="https://agentmods.dev/badge/skills/arhen/agents/dev-null/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.

agentmods 80×15 button for dev-null

Your own site · 80×15
<a href="https://agentmods.dev/skills/arhen/agents/dev-null"><img src="https://agentmods.dev/badge/skills/arhen/agents/dev-null.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 81 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 1,005 The whole file, excluding the scripts and references it only reads on demand.
Security scan C 2 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 $0.00081 $0.01005
Opus 5.5 $0.00032 $0.00402
Sonnet 5.5 $0.00016 $0.00201
Haiku 4.5 $0.00008 $0.00101

Measured 17d ago against content hash bc302d9e6c0a, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade C, and why

dev-null scanned grade C 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 17d 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.

Downloads and executes remote codehighSupply chain

curl | sh runs whatever the server returns today, which is not necessarily what it returned when this was reviewed.

like `curl -fsSL https://dev-null.sh/commit | bash`. The composer takes `@`

Makes network callslowCapability

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

like `curl -fsSL https://dev-null.sh/commit | bash`. The composer takes `@`
skills/dev-null/SKILL.md · 92 lines

The source is not reproduced here

No licence file

A repository with no LICENSE is all rights reserved by default, so the body is not copied here. The metadata, the measurements and the link are.

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. 17d ago First seen · 92 lines · 81 tokens per session scan C bc302d9e6c0a

Subscribe to this mod's changes

dev-null is a skill published in the GitHub repository arhen/agents (13 stars, last pushed yesterday), with no licence file. It adds 81 tokens to every session and 1,005 once invoked, about $0.0003 per session on Opus 5.5. A static security scan graded it C with 2 findings (downloads and executes remote code, makes network calls). No closer match exists in the catalogue, so it is treated as the original; first seen 2026-10-21.

CommitsGit and workflow
Related

dev-null compared with skills from other repositories

dev-null next to 6 skills from other repositories
ModTypeStarsLast pushLicenceScanTokensWorks with
dev-nullarhen/agentsSkill13yesterdaynoneC81Claude Code, Codex
create-prprisma/ormSkill48ktodayApache-2.0A48Claude Code, Codex
git-commitThinkInAIXYZ/deepchatSkill6.4kyesterdayApache-2.0A15Claude Code, Codex
repo-syncdavidondrej/skillsSkill4.3kyesterdayMITA25Claude Code, Codex
engineer-bot-opsmakecindy/cindySkill9.4ktodayApache-2.0A57Claude Code, Codex
mcore-split-prNVIDIA/skillsSkill3.9ktodayApache-2.0A25Claude Code
git-commit-writermergisi/awesome-openclaw-agentsSkill4.1k3d agoMITA53Claude Code, Codex