Borrowing it
Nothing to install: this file belongs to krzysztofdudek/UrdSkill. 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/krzysztofdudek/UrdSkill/main/CLAUDE.mdgit clone --depth 1 https://github.com/krzysztofdudek/UrdSkillWrote 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/krzysztofdudek/urdskill/claude-md)<a href="https://agentmods.dev/instructions/krzysztofdudek/urdskill/claude-md"><img src="https://agentmods.dev/badge/instructions/krzysztofdudek/urdskill/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/krzysztofdudek/urdskill/claude-md"><img src="https://agentmods.dev/badge/instructions/krzysztofdudek/urdskill/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 | $0.00982 | $0.00982 |
| Opus 5 | $0.00491 | $0.00491 |
| Sonnet 5 | $0.00196 | $0.00196 |
| Haiku 4.5 | $0.00098 | $0.00098 |
Grade A, and why
UrdSkill CLAUDE.md scanned grade A with 0 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 yesterday.
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.
Nothing flagged
None of the 26 patterns this scan looks for appear in this file: no shell pipes, no recursive deletes, no credential paths, no hidden text, no instruction-override or anti-refusal phrasing, no agent-config snooping. That is not a guarantee, it is the absence of the things that are checkable.
How it starts
The opening of the file, as written. The whole thing — 32 lines — stays where its author put it; the contents beside it link to each section on GitHub.
UrdSkill
Purpose
This repository exists solely so the author can develop and version the urd skill. The canonical file is skills/urd/SKILL.md — people install it as a Claude Code plugin (or copy that one file into their agent's skill dir). Nothing in this repo (CLAUDE.md, CHANGELOG.md, README.md, CI, etc.) may affect the skill's mechanics. All behavior must be self-contained in skills/urd/SKILL.md.
Urd (formerly "BePrecise") is an add-on in the Yggdrasil family: it attaches to the agent, not to the graph, and works alone. It owns the intent → code stage — when the agent moves from a plan/spec into implementation, it consults the source of truth and asks instead of guessing. The family's core is Yggdrasil (the architecture graph and the rails), Grain (the first graph, mined from a repository's own code and history) and Horde (the loop past one agent's context), adopted in that order; Ratatoskr, Urd and Researcher are the three add-ons beside them.
Plugin scaffolding
This repo is installable as a Claude Code plugin and as a GitHub Copilot CLI plugin. Layout:
.claude-plugin/plugin.json— plugin manifest (name, version, description, keywords).versionhere MUST match the latest released version inCHANGELOG.mdand is bumped together with it..claude-plugin/marketplace.json— single-plugin marketplace listing for Claude Code, so the repo can be added via/plugin install urd@urd-marketplace..github/plugin/marketplace.json— single-plugin marketplace listing for GitHub Copilot CLI (Copilot reads this path), so the repo can be added viacopilot plugin marketplace add krzysztofdudek/UrdSkillthencopilot plugin install urd@urd-marketplace. Mirrors the Claude listing but additionally carriesversionand askillsarray (./skills/urd). Its pluginversionMUST be kept in lockstep withplugin.json..codex-plugin/plugin.json— plugin manifest for OpenAI Codex CLI (Codex reads the plugin manifest only from.codex-plugin/). Bundles the skill via"skills": "./skills/"; Codex discovers the marketplace from the existing.claude-plugin/marketplace.json(its legacy-compatible path), so the repo installs viacodex plugin marketplace add krzysztofdudek/UrdSkillthencodex plugin install urd@urd-marketplace. ItsversionMUST be kept in lockstep withplugin.json..cursor-plugin/plugin.json— plugin manifest for Cursor (single-plugin-at-root: manifest at the repo root, no Cursor marketplace file; components are auto-discovered, soskills/urd/is picked up automatically). Installed locally via~/.cursor/plugins/local/or published to the Cursor Marketplace. ItsversionMUST be kept in lockstep withplugin.json.skills/urd/SKILL.md— the canonical skill body. Editing this file IS editing the skill.
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.
- yesterday Changed · +54 tokens per session 6d9eb2195887
- 10d ago First seen · 32 lines · 928 tokens per session scan A 2153981f6aac
UrdSkill CLAUDE.md is an instructions file published in the GitHub repository krzysztofdudek/UrdSkill (2 stars, last pushed today), licensed MIT. It adds 982 tokens to every session, about $0.0049 per session on Opus 5. A static security scan graded it A with 0 findings. No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-31.
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