create-master-skill

create-master-skill is a skill for Claude Code, Codex from DorianSchlede/nexus-template. It costs 16 tokens per session (1,901 once invoked), scanned A, original, MIT.

A guided workflow for creating a shared master skill that holds common instructions and resources for several related skills.

In plain words
What is it for?
Use it to plan, build, and check reusable skill libraries for an external integration or service.
Why use it?
It prevents duplicated setup and documentation, while requiring research, design, building, and validation in a fixed order.

Skill for Claude CodeCodex

Written for no agent in particular: nothing here depends on one. Also seen: names the TodoWrite tool.

Good fit Use it to plan, build, and check reusable skill libraries for an external integration or service.

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Install with agentmods
npx agentmods add skills/dorianschlede/nexus-template/create-master-skill
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 DorianSchlede/nexus-template --skill create-master-skill
Clone the repo
git clone --depth 1 https://github.com/DorianSchlede/nexus-template

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 create-master-skill

README.md
[![agentmods](https://agentmods.dev/badge/skills/dorianschlede/nexus-template/create-master-skill/github.svg)](https://agentmods.dev/skills/dorianschlede/nexus-template/create-master-skill)
Your own site
<a href="https://agentmods.dev/skills/dorianschlede/nexus-template/create-master-skill"><img src="https://agentmods.dev/badge/skills/dorianschlede/nexus-template/create-master-skill/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-master-skill

Your own site · 80×15
<a href="https://agentmods.dev/skills/dorianschlede/nexus-template/create-master-skill"><img src="https://agentmods.dev/badge/skills/dorianschlede/nexus-template/create-master-skill.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 16 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 1,901 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 $0.00016 $0.01901
Opus 5 $0.00008 $0.00950
Sonnet 5 $0.00003 $0.00380
Haiku 4.5 $0.00002 $0.00190

Measured 8d ago against content hash 9573899a3391, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-11, from the pricing page.

Security

Grade A, and why

create-master-skill 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 8d ago.

The scan reads SKILL.md. This mod also ships 1 executable file (scripts/init_master_skill.py), listed below but not scanned — reading those needs a real analyzer, not pattern matching.

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.

00-system/skills/skill-dev/create-master-skill/SKILL.md · 288 lines

How it starts

The opening of the file, as written. The whole thing — 288 lines — stays where its author put it; the contents beside it link to each section on GitHub.


[!] CRITICAL EXECUTION REQUIREMENTS [!]

WORKFLOW: Build FIRST, Research SECOND, Build THIRD

MANDATORY STEPS (DO NOT SKIP):

  1. [OK] Create TodoWrite with ALL phases
  2. [OK] Ask integration name (e.g., "airtable", "slack", "github")
  3. [OK] RUN plan-build skill to create planning build
  4. [OK] PHASE 1: Web Research - comprehensive API/integration research
  5. [OK] PHASE 2: Architecture Design - define master skill structure
  6. [OK] PHASE 3: Build - create master skill from templates
  7. [OK] PHASE 4: Validate - test and document

ANTI-PATTERN (DO NOT DO THIS): [ERROR] Skip build creation [ERROR] Start building without research [ERROR] Create master skill without understanding the integration [ERROR] Copy from notion-master without adapting [ERROR] Skip validation phase

CORRECT PATTERN (DO THIS): [OK] Ask integration → Create build → Research → Design → Build → Validate

Create Master Skill

Build production-ready master skills (shared resource libraries) for any integration.

Purpose

Master skills solve the duplication problem: When 3+ skills share common content (setup, API docs, error handling), extract it into a master skill that all can reference.

Key Insight from notion-master:

  • 3 Notion skills had 950 lines of duplicated content
  • After extraction: 60% context reduction (950 → 370 lines)
  • Single source of truth for setup, API, errors, schemas

Quick Start

User says: "create master skill for Airtable"

AI does:

  1. Creates planning build: {ID}-airtable-master-skill
  2. Runs comprehensive web research on Airtable API
  3. Designs architecture based on research
  4. Builds master skill from templates
  5. Validates and documents

Workflow

Phase 0: Initiation

[*] CREATE MASTER SKILL

What integration do you want to create a master skill for?
Examples: airtable, slack, github, linear, google-sheets, stripe

Integration name: ___________

Read the full file on GitHub · 288 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. 8d ago First seen · 288 lines · 16 tokens per session scan A 9573899a3391

Subscribe to this mod's changes

create-master-skill is a skill published in the GitHub repository DorianSchlede/nexus-template (8 stars, last pushed 7mo ago), licensed MIT. It adds 16 tokens to every session and 1,901 once invoked, about $0.0001 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 2026-09-03.

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