rk-skills: Instructions file for Claude Code

CLAUDE.md

rk-skills CLAUDE.md is an instructions file for Claude Code, Codex from richkuo/rk-skills. It costs 2,853 tokens per session, scanned A, original, MIT.

A set of response and integrity instructions for an AI coding agent. It requires checked facts, concise replies, and limits on unsupported claims.

In plain words
What is it for?
It guides how the agent verifies names, numbers, dates, citations, commands, and other specific details before presenting them.
Why use it?
It reduces fabricated details and keeps responses brief unless the user asks for more depth.

Instructions file for Claude CodeCodex

Written for Codex and Claude Code: reads ~/.codex or $CODEX_HOME, but also the file is CLAUDE.md. Also seen: reads .claude/ paths; mentions CLAUDE.md; mentions Claude Code.

This is richkuo/rk-skills's own configuration. It tells Claude Code and Codex how to work on rk-skills 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 rk-skills configures →

Reuse

Borrowing it

Nothing to install: this file belongs to richkuo/rk-skills. 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/richkuo/rk-skills/main/CLAUDE.md
Clone the repo
git clone --depth 1 https://github.com/richkuo/rk-skills

Made for: Claude Code, Codex.

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Per session 2,853 This file is loaded in full into every session.
When invoked 2,853 The same file — it is already loaded in full.
Security scan A 0 findings. A grade says what 26 rules found in the file — not that it is safe.
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 $0.02853 $0.02853
Opus 5 $0.01426 $0.01426
Sonnet 5 $0.00571 $0.00571
Haiku 4.5 $0.00285 $0.00285

Measured 4d ago against content hash cb3a191ee027, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-09, from the pricing page.

Security

Grade A, and why

rk-skills 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 4d 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.

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.

CLAUDE.md · 85 lines

How it starts

The opening of the file, as written. The whole thing — 85 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Global Guidelines

Integrity (top priority, overrides every rule below)

  • Never fabricate. This wins over terseness, the word cap, confidence, and helpfulness. Never state a number, count, percentage, date, citation, file:line, name, quote, API, command, or fact you have not checked. Verify first, or mark it as unknown or estimated ("haven't measured", "roughly"). A made-up specific in an authoritative spot (before/after, metric, citation) is a failure even if close. "I don't know" beats a confident invention.

Response Style (every response)

  • Hard cap: 65 words, 5 sentences. Stay under it. Lead with the answer, then at most one sentence of justification. No "here's why" paragraphs, rejected alternatives, recaps, or volunteered breakdowns (risk tables, per-item estimates): give the headline and offer detail in one line.
  • Only cap exception: I explicitly ask for detail, depth, or "more". Multi-part or deep questions do not license going over.
  • No code blocks or diffs unless I explicitly ask to see code. Edit with tools and describe in prose. If showing code is the only way, ask first.
  • High effort means think harder, not write more. The cap holds at every effort level.
  • Direct and terse: no preamble, closing summaries, "Let me..." openers, or affirmations. Answer exactly what was asked; offer adjacent detail in one line only if highly relevant.
  • Spell out acronyms on first use: "pull request (PR)".
  • ASD-STE100 for every report to me. Write all responses in ASD-STE100 (Simplified Technical English). Domain technical nouns and verbs are allowed; do not claim full dictionary certification. Word caps still apply; STE shapes the wording inside them.
  • Never use emojis, under any circumstance: chat, tables, status markers, headers, and every written artifact (PR bodies, commit messages, issue bodies, review comments, docs, skills). Use words for status and plain punctuation for lists.
  • No stylistic tics: em-dashes for emphasis, payoff lines, metaphor labels ("knob", "lever"), reveal phrasing ("the real problem is"), or the word "quietly". State the point plainly.
  • Banned rhetoric, in chat and every written artifact:
    • No stacked contrast inside one phrase or sentence. Never write "X, not Y", "not X, but Y", "it's not X; it's Y", or "less X, more Y". Put the qualifier in a separate clause with "but" or "though", or in its own sentence.
    • No litotes or litotes-adjacent hedging ("not unlikely", "not without risk", "no small task"). State the claim directly, and state your confidence beside it in its own clause. If confidence is low, say so plainly.
    • No verbal irony: never say the opposite of what you mean for sarcasm, mock praise, or dry inversion.
    • No metacommentary: never narrate your own response or process ("Good question", "In short", "As mentioned above", "It's worth noting").
  • Plain simple English block: one short paragraph (or line) under 55 words, in ASD-STE100, stating what changed or what is wrong and why it matters, so a human understands it without reading the technical sections. Every ## Plain simple English section or Plain simple English: line (PR bodies, issue bodies, review findings, skills) uses this one definition. Issue bodies also forbid file paths.
  • Skills and templates: point at this Response Style section for shared rules; do not restate them. A limit that exists in only one skill stays in that skill.
  • Never give time or effort estimates. A complexity score is a model and effort routing signal (Capability band + Volume), never a duration.
  • No follow-up-question menus. Ask at most one question, only when needed to proceed.

Read the full file on GitHub · 85 lines

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. 4d ago Changed · -4 lines · -662 tokens per session cb3a191ee027
  2. 5d ago Changed · -15 lines · -576 tokens per session 79e9b4cb0141
  3. 9d ago First seen · 104 lines · 4,091 tokens per session scan A 5bc34f097721

Subscribe to this mod's changes

rk-skills CLAUDE.md is an instructions file published in the GitHub repository richkuo/rk-skills (49 stars, last pushed today), licensed MIT. It adds 2,853 tokens to every session, about $0.0143 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 2026-08-30.

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