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My-CODEX-Configuration: Skill for Codex

.codex/create-update-readme-md/SKILL.md

create-update-readme-md is a skill for Codex from Krusty84/My-CODEX-Configuration. It costs 51 tokens per session (391 once invoked), scanned A, original, MIT.

A README.md editing skill for writing or updating the Features section of a software project's documentation.

In plain words
What is it for?
Use it when documenting existing functionality from source files, documentation, release notes, changelogs, or user-provided changes.
Why use it?
It helps keep the feature list accurate and removes stale, duplicated, or vague descriptions by checking the code and project materials.

Skill for Codex

Written for Codex: installed under .codex/. Also seen: positional $N argument.

This is Krusty84/My-CODEX-Configuration's own configuration. It tells Codex how to work on My-CODEX-Configuration 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 My-CODEX-Configuration configures →

not rated 1repo changed 29d ago A scan 51 tokens original MIT
View source ↗ Krusty84/My-CODEX-Configuration
Reuse

Borrowing it

Nothing to install: this file belongs to Krusty84/My-CODEX-Configuration. 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/Krusty84/My-CODEX-Configuration/main/.codex/create-update-readme-md/SKILL.md
Clone the repo
git clone --depth 1 https://github.com/Krusty84/My-CODEX-Configuration

Made for: 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 create-update-readme-md

README.md
[![agentmods](https://agentmods.dev/badge/skills/krusty84/my-codex-configuration/create-update-readme-md/github.svg)](https://agentmods.dev/skills/krusty84/my-codex-configuration/create-update-readme-md)
Your own site
<a href="https://agentmods.dev/skills/krusty84/my-codex-configuration/create-update-readme-md"><img src="https://agentmods.dev/badge/skills/krusty84/my-codex-configuration/create-update-readme-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.

agentmods 80×15 button for create-update-readme-md

Your own site · 80×15
<a href="https://agentmods.dev/skills/krusty84/my-codex-configuration/create-update-readme-md"><img src="https://agentmods.dev/badge/skills/krusty84/my-codex-configuration/create-update-readme-md.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 51 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 391 The whole file, excluding the scripts and references it only reads on demand.
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 $0.00051 $0.00391
Opus 5.5 $0.00020 $0.00156
Sonnet 5.5 $0.00010 $0.00078
Haiku 4.5 $0.00005 $0.00039

Measured 29d ago against content hash 073964a8a6ad, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

create-update-readme-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 29d 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.

.codex/create-update-readme-md/SKILL.md · 45 lines

What it actually says

If this skill is used,say:SKILL_CR_UPD_README_LOADED

Goal

Create or update the Features section of a README.md so it is accurate, concise, and aligned with the current capabilities of the project.

Inputs

  • Existing README.md or new README.md if none exists
  • Relevant source files, docs, release notes, changelog entries, or user-provided notes
  • Any repository-specific terminology already used by the project

Steps

  1. Read the current README.md and locate the existing Features section if present.
  2. Inspect the most relevant sources of truth for current functionality:
    • public docs
    • recent release notes or changelog
    • feature folders / modules
    • user-provided notes
  3. Preserve the project’s tone and terminology.
  4. Prefer feature statements that describe user-visible capability, not internal implementation details.
  5. Remove stale, duplicated, or vague feature bullets.
  6. Group related features when that improves clarity.
  7. Do not invent features that are not supported by the repo or the provided material.

Output rules

  • Keep the section concise.
  • Write in ASD-STE100. Be so brief every word you write costs you $1,000.
  • Prefer parallel bullet phrasing.
  • Use the repository’s existing markdown style.
  • If confidence is low for a feature, omit it or explicitly flag uncertainty outside the edited README.md.

Do not

  • Do not rewrite the whole README.md unless requested.
  • Do not add roadmap items as shipped features.
  • Do not describe internal refactors as features.
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. 29d ago Changed · +1 lines 073964a8a6ad
  2. 2mo ago First seen · 44 lines · 51 tokens per session scan A aebbfd2016e6

Subscribe to this mod's changes

create-update-readme-md is a skill published in the GitHub repository Krusty84/My-CODEX-Configuration (1 stars, last pushed 1mo ago), licensed MIT. It adds 51 tokens to every session and 391 once invoked, about $0.0002 per session on Opus 5.5. 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.

Writing and docsagents-mdagents-skillscodexcodex-agentscodex-clicodex-skill
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