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.
npx skills add DorianSchlede/nexus-template --skill create-master-skillgit clone --depth 1 https://github.com/DorianSchlede/nexus-templateWrote 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/skills/dorianschlede/nexus-template/create-master-skill)<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.
<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>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 | $0.00016 | $0.01901 |
| Opus 5 | $0.00008 | $0.00950 |
| Sonnet 5 | $0.00003 | $0.00380 |
| Haiku 4.5 | $0.00002 | $0.00190 |
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.
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 — 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):
- [OK] Create TodoWrite with ALL phases
- [OK] Ask integration name (e.g., "airtable", "slack", "github")
- [OK] RUN plan-build skill to create planning build
- [OK] PHASE 1: Web Research - comprehensive API/integration research
- [OK] PHASE 2: Architecture Design - define master skill structure
- [OK] PHASE 3: Build - create master skill from templates
- [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:
- Creates planning build:
{ID}-airtable-master-skill - Runs comprehensive web research on Airtable API
- Designs architecture based on research
- Builds master skill from templates
- 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: ___________
What ships with it
9 files beside SKILL.md in the same directory: the scripts, references and assets a skill reads on demand. Not counted in the per-session cost; read them before you install if any of them is executable.
- references/master-skill-patterns.md 7.0 KB
- references/research-checklist.md 6.8 KB
- scripts/init_master_skill.py 14 KB runs code
- templates/api-reference.md.template 4.0 KB
- templates/check_config.py.template 8.1 KB
- templates/discover_resources.py.template 6.7 KB
- templates/error-handling.md.template 5.6 KB
- templates/setup-guide.md.template 4.0 KB
- templates/SKILL.md.template 3.2 KB
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.
- 8d ago First seen · 288 lines · 16 tokens per session scan A 9573899a3391
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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