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Zugzwang: Skill for Claude Code

.agents/skills/build-run-bundle/SKILL.md

build-run-bundle is a skill for Claude Code, Codex from maelrx/Zugzwang. It costs 30 tokens per session (234 once invoked), scanned B, original, GPL-3.0.

A self-contained bundle for running work and preserving its evidence and analysis. Checksums are used to detect changes to those files.

In plain words
What is it for?
Building, validating, importing, redacting, and evolving run bundles and their evidence artifacts.
Why use it?
It keeps run inputs and results together so they can be checked, imported, redacted, or updated consistently.

Skill for Claude CodeCodex

Which agent this was written for is unclear — body not stored (licence); the path alone says nothing. Also seen: installed under .agents/ (shared by several agents).

This is maelrx/Zugzwang's own configuration. It tells Claude Code and Codex how to work on Zugzwang 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 Zugzwang configures →

not rated 6repo 1mo ago B scan 30 tokens GPL-3.0
View source ↗ maelrx/Zugzwang
Reuse

Borrowing it

Nothing to install: this file belongs to maelrx/Zugzwang. 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/maelrx/Zugzwang/main/.agents/skills/build-run-bundle/SKILL.md
Clone the repo
git clone --depth 1 https://github.com/maelrx/Zugzwang

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 build-run-bundle

README.md
[![agentmods](https://agentmods.dev/badge/skills/maelrx/zugzwang/build-run-bundle/github.svg)](https://agentmods.dev/skills/maelrx/zugzwang/build-run-bundle)
Your own site
<a href="https://agentmods.dev/skills/maelrx/zugzwang/build-run-bundle"><img src="https://agentmods.dev/badge/skills/maelrx/zugzwang/build-run-bundle/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 build-run-bundle

Your own site · 80×15
<a href="https://agentmods.dev/skills/maelrx/zugzwang/build-run-bundle"><img src="https://agentmods.dev/badge/skills/maelrx/zugzwang/build-run-bundle.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 30 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 234 The whole file, excluding the scripts and references it only reads on demand.
Security scan B 1 finding. 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 $0.00030 $0.00234
Opus 5.5 $0.00012 $0.00094
Sonnet 5.5 $0.00006 $0.00047
Haiku 4.5 $0.00003 $0.00023

Measured 2mo ago against content hash e7773f88de0c, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade B, and why

build-run-bundle 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 2mo 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.

Unrestricted tool accessmediumExcessive agency

A wildcard tool grant or "run any command" leaves no least-privilege boundary at all.

- import does not execute arbitrary code or trust paths.
.agents/skills/build-run-bundle/SKILL.md · 29 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. 2mo ago First seen · 29 lines · 30 tokens per session scan B e7773f88de0c

Subscribe to this mod's changes

build-run-bundle is a skill published in the GitHub repository maelrx/Zugzwang (6 stars, last pushed 1mo ago), licensed GPL-3.0. It adds 30 tokens to every session and 234 once invoked, about $0.0001 per session on Opus 5.5. A static security scan graded it B with 1 finding (unrestricted tool access). No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-31.

Related

build-run-bundle compared with skills from other repositories

build-run-bundle next to 6 skills from other repositories
ModTypeStarsLast pushLicenceScanTokensWorks with
build-run-bundlemaelrx/ZugzwangSkill61mo agoGPL-3.0B30Claude Code, Codex
imagegenopenai/codexSkill133kyesterdayApache-2.0A113Codex
playwright-climicrosoft/playwrightSkill99kyesterdayApache-2.0A19Claude Code
local-ai-agentsmicrosoft/ai-agents-for-beginnersSkill79k4d agoMITA200Claude Code, Codex
systematic-debuggingobra/superpowersSkill313k3d agoMITA21Claude Code
next-cache-components-adoptionvercel/next.jsSkill143ktodayMITA95Claude Code
next-partial-prefetching-adoptionvercel/next.jsSkill143ktodayMITA103Claude Code